/C O R R E C T I O N — Needham Bank/

In the news release, NB Bancorp, Inc. Reports Third Quarter 2025 Financial Results, Declares Quarterly Cash Dividend, issued 22-Oct-2025 by Needham Bank over PR Newswire, we are advised by the company that under the “ASSET QUALITY” header in the text portion of the release, the second sentence in the third bullet point, beginning with “The decrease was primarily due to…” has been amended. The complete, corrected release follows:

NB Bancorp, Inc. Reports Third Quarter 2025 Financial Results, Declares Quarterly Cash Dividend

NBBancorp, Inc. (the “Company”) (Nasdaq Capital Market: NBBK), the holding company of Needham Bank (the “Bank”), today announced its third quarter 2025 financial results. The Company reported net income of $15.4 million, or $0.43 per diluted common share, compared to net income of $14.6 million, or $0.39 per diluted common share, for the prior quarter. Operating net income(1), excluding one-time charges, amounted to $16.0 million, or $0.45 per diluted common share, compared to operating net income(1) of $15.0 million, or $0.40 per diluted common share for the prior quarter. The primary difference between net income and operating net income(1) for the third quarter of 2025 was merger and acquisition costs of $994 thousand (pre-tax) related to the Company's pending acquisition of Provident Bancorp, Inc. (“Provident”) and its subsidiary, BankProv, which was announced on June 5, 2025.

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“During the third quarter, we continued to deliver strong, record earnings as we executed our growth strategy. We look forward to the anticipated closing and conversion of our acquisition of Provident in the fourth quarter of 2025. We were able to expand new relationships with consumers and businesses across our markets resulting in an increase in both loans and deposits during the third quarter at annualized rates of 15.4% and 27.9%, respectively. We were able to reduce our loan to deposit ratio from 106% to 103% quarter over quarter. However, net interest margin declined by 4 basis points to 3.78% for the third quarter from 3.82% in the second quarter, as a result of a decrease in default interest income earned on loan workouts from the prior quarter, along with loans re-pricing and interest expense associated with two cash flow hedges executed during the third quarter to help protect the Company in a down rate environment. We look forward to the final quarter of 2025 and, now that we have received all required regulatory approvals, welcoming Provident customers and team members to the Company. We expect the final quarter to provide the team with an exciting environment and additional growth opportunities on both sides of the balance sheet,” commented Joseph Campanelli, Chairman, President and Chief Executive Officer. “We look forward to differentiating ourselves on customer service, along with new product features and functionality as we continue to grow market share and take advantage of opportunities to enhance shareholder value, including our growth in the Provident market upon the closing of the acquisition on November 14th,” Campanelli continued.

Declaration of Dividend The Board of Directors declared a quarterly cash dividend of $0.07 per share, payable on November 19, 2025, to shareholders of record as of November 5, 2025.

SELECTED FINANCIAL HIGHLIGHTS FOR THE THIRD QUARTER OF 2025

— Net income of $15.4 million, or $0.43 per diluted common share, compared to net income of $14.6 million, or $0.39 per diluted common share, for the prior quarter. Operating net income(1), excluding one-time charges, amounted to $16.0 million, or $0.45 per diluted common share, compared to operating net income(1) of $15.0 million, or $0.40 per diluted common share, for the prior quarter.

One-time pre-tax amounts during the current quarter include:

— Merger and acquisition costs of $994 thousand related to the Company's pending acquisition of Provident; and

— State voluntary disclosure agreement tax expenses of $561 thousand for new state income tax expenses; partially offset by

— Defined benefit pension termination refund of $739 thousand.

One-time pre-tax charges during the prior quarter include:

— Merger and acquisition costs of $530 thousand related to the Company's pending acquisition of Provident;

— BOLI surrender tax and modified endowment contract penalty of $64 thousand.

— Net interest margin declined by 4 basis points to 3.78% during the current quarter from 3.82% in the prior quarter.

— Gross loans increased $175.0 million, or 3.9%, to $4.72 billion, from $4.54 billion the prior quarter.

— Total deposits increased $297.6 million, or 7.0%, from the prior quarter. Core deposits, which the Company considers to be all non-brokered deposits, increased $163.1 million, or 4.1%, during the current quarter. Brokered deposits increased $134.5 million, or 52.9%, from the prior quarter.

— Book value per share and tangible book value per share(1) were $18.51 and $18.48, respectively, which increased from $18.09 and $18.06, respectively in the prior quarter. The increase in tangible book value per share(1) was a result of $15.4 million in net income for the quarter, along with a $3.1 million impact from a positive change in accumulated other comprehensive income, partially offset by the repurchase of 921,934 shares during the current quarter at an all-in weighted average cost of $19.02 per share and $2.8 million in dividends paid during the quarter.

BALANCE SHEET Total assets amounted to $5.44 billion as of September30,2025, representing an increase of $215.8 million, or 4.1%, from June30,2025.

— Cash and cash equivalents increased $36.7 million, or 14.2%, to $295.4 million from $258.7 million in the prior quarter, as a result of the increase in deposits of $297.6 million, partially offset by the increase in loans of $175.0 million and a decrease in FHLB borrowings of $86.1 million.

— Net loans increased $174.5 million, or 3.9%, to $4.67 billion, from the prior quarter as demand for new loan originations and advances continued. The current quarter growth was primarily seen in multi-family residential loans, which increased $113.7 million, or 35.9%, commercial real estate loans, which increased $76.3 million, or 5.6%, commercial and industrial loans, which increased $26.5 million, or 4.2%, residential real estate loans, which increased $18.7 million, or 1.5%, and consumer loans, which increased $9.6 million, or 3.8%; partially offset by a decrease in construction and land development loans of $69.3 million, or 9.6%.

— Deposits increased $297.6 million, or 7.0%, to $4.57 billion from $4.27 billion in the prior quarter. The increase in deposits was the result of increases in brokered deposits of $134.5 million, or 52.9%, money market accounts of $120.5 million, or 11.0% and certificates of deposit of $92.1 million, or 5.5%, partially offset by a decrease in non-interest bearing demand deposits of $38.4 million, or 5.9%.

— FHLB borrowings decreased $86.1 million, or 67.5%, to $41.5 million from $127.6 million during the current quarter as a result of overall deposit growth.

— Shareholders' equity decreased $88 thousand, or 0.0%, to $737.0 million from the prior quarter, primarily as a result of $17.5 million related to the repurchase of 921,934 shares of common stock at an all-in weighted average cost of $19.02 per share and $2.8 million in dividends paid, partially offset by $15.4 million in net income and a $3.1 million positive change in accumulated other comprehensive income. Shareholders' equity to total assets and tangible shareholders' equity(1) to tangible assets were both 13.5% at the end of the current quarter, and 14.1% at the end of the prior quarter.

NET INTEREST INCOME Net interest income was $48.2 million for the current quarter, compared to $47.0 million for the prior quarter, an increase of $1.2 million, or 2.5%. Net interest margin compressed 4 basis points to 3.78% for the quarter from 3.82% in the prior quarter.

— The increase in interest income during the current quarter was primarily attributable to an increase in the average balance of loans.

— The increase in interest expense for the current quarter was primarily driven by increases in the average balance of FHLB advances, partially offset by declines in the weighted-average rate on certificates of deposit and individual retirement accounts.

PROVISION FOR CREDIT LOSSES Provision for credit losses decreased $1.8 million, or 55.8%, to $1.4 million for the current quarter, compared to $3.2 million for the prior quarter.

— The provision for credit losses on loans was $1.0 million for the current quarter, compared to $4.2 million for the prior quarter, representing a decrease of $3.2 million, or 75.5%, primarily driven by construction and development loans transitioning to permanent financing in multi-family residential loans which carry lower loss rates; partially offset by loan growth.

— The provision for credit losses on unfunded commitments was a provision of $355 thousand for the current quarter, compared to a release of $1.1 million for the prior quarter, representing an increase of $1.4 million, or 132.8%, primarily driven by an increase in the balance of unfunded commitments during the current quarter.

NONINTEREST INCOME Noninterest income was $3.6 million for the current quarter, compared to $4.2 million for the prior quarter, representing a decrease of $627 thousand, or 15.0%.

— Swap contract income was $208 thousand for the current quarter, compared to $524 thousand in the prior quarter, representing a decrease of $316 thousand, or 60.3%, due to decreased swap contract demand.

— The increase in the cash surrender value of BOLI was $631 thousand for the current quarter, compared to $787 thousand for the prior quarter, representing a smaller increase in the cash surrender value of BOLI of $156 thousand, or 19.8%, driven by the receipt of proceeds from surrendered BOLI policies during the prior quarter.

— Other income was $21 thousand, compared to $172 thousand in the prior quarter, resulting in a decrease of $151 thousand, or 87.8%, from the annual MasterCard branding bonus earned during the prior quarter.

NONINTEREST EXPENSE Noninterest expense for the current quarter was $30.4 million, representing an increase of $1.1 million, or 3.6%, from the prior quarter.

— Merger and acquisition expenses were $994 thousand for the current quarter, compared to $530 thousand for the prior quarter, representing a $464 thousand, or 87.5%, increase due to continued expenses related to the Provident acquisition.

— Data processing expenses increased $418 thousand, or 16.8%, to $2.9 million in the current quarter, compared to $2.5 million in the prior quarter, primarily as a result of a $218 thousand increase in electronic banking expense and an increase of $180 thousand in management information systems expense as the Company continues to invest in technology, including cash management software.

INCOME TAXES Income tax expense for the current quarter was $4.6 million, representing a $460 thousand, or 11.1%, increase from the prior quarter. The increase was primarily driven by $562 thousand in state voluntary disclosure agreements tax expense incurred during the current quarter. The effective tax rate and the operating effective tax rate(1) was 23.0% and 20.2%, respectively, for the current quarter, compared to 22.1% and 21.8%, respectively, for the prior quarter. The primary drivers of the increase in the effective tax rate were the state voluntary disclosure agreements tax expense incurred during the current quarter, along with non-deductible merger and acquisition expenses.

COMMERCIAL REAL ESTATE PORTFOLIO Commercial real estate loans increased $190.0 million, or 11.2%, to $1.88 billion, during the current quarter.

— Cannabis facility commercial real estate loans decreased $7.0 million, or 2.6%, during the quarter ended September 30, 2025. The Company's cannabis facility commercial real estate portfolio is secured entirely by the underlying commercial real estate of the borrower operation. The vast majority of the cannabis facility loan portfolio balances have a loan-to-value ratio of 65% or lower, with appraisal reports taking a blended approach (using both cannabis and non-cannabis use comparable real estate sales, which we believe are generally more conservative).

— The cannabis facility portfolio has geographic dispersion, with lower dollar exposure loans remaining local and larger dollar exposure loans generally tied to multi-state operators with a more national footprint. All cannabis facility loan relationships were current at the end of the current quarter.

— The Company's multi-family real estate loan portfolio increased $113.7 million, or 35.9%, during the current quarter to $430.4 million, as a result of construction and land development loans transitioning to permanent financing and continued originations. The Company's multi-family real estate loan portfolio consists of properties primarily located in the Greater Boston area, primarily all of which are adjustable-rate loans and all of which were performing at September 30, 2025.

— Hospitality commercial real estate loans increased $75.4 million, or 43.8%, during the current quarter, resulting from continued originations from increased customer demand.

— The Company's $216.9 million office portfolio consists principally of suburban Class A and B office space used as medical and traditional offices. The portfolio does not consist of high-rise towers located in Boston.

ASSET QUALITY

— The allowance for credit losses (“ACL”) amounted to $43.1 million as of September 30, 2025, or 0.91% of total loans, compared to $42.6 million, or 0.94% of total loans at June 30, 2025. The Company recorded provisions for credit losses of $1.4 million during the current quarter, which included a provision of $1.0 million for loans and a provision of $355 thousand for unfunded commitments, compared to provisions for credit losses of $3.2 million during the prior quarter, which included a provision of $4.2 million for loans and a release of credit losses of $1.1 million for unfunded commitments.

— The increase in the ACL for the current quarter was the result of loan growth offset by movement of construction and development loans into permanent financing as multi-family residential loans which carry lower reserves.

— Non-performing loans totaled $11.4 million as of September 30, 2025, a decrease of $1.1 million, or 9.0%, from $12.5 million at the end of the prior quarter. The decrease was primarily due to the decrease in commercial real estate loans on non-accrual of $1.2 million and home equity loans on non-accrual of $367 thousand as a result of one loan relationship payoff,partially offset by increases in consumer loans on non-accrual of $552 thousand during the current quarter.

— During the current quarter, the Company recorded total net charge-offs of $590 thousand, or 0.05% of average total loans on an annualized basis, compared to a $19 thousand net recovery, or 0.00% of average total loans on an annualized basis, in the prior quarter. The increase in net charge-offs during the current quarter was primarily a result of a $923 thousand recovery on a previously charged-off commercial real estate participation loan during the prior quarter.

— The Company's loan portfolio consists primarily of commercial real estate and multi-family loans, one-to-four-family residential real estate loans, construction and land development loans, commercial and industrial loans and consumer loans. These loans are primarily made to individuals and businesses located in our primary lending market area, which is the Greater Boston metropolitan area and surrounding communities in Massachusetts, eastern Connecticut, southern New Hampshire and Rhode Island.

(1) Represents a non-GAAP measure. See Non-GAAP reconciliation of the corresponding GAAP measures on page 12.

ABOUT NB BANCORP, INC. NB Bancorp, Inc. (Nasdaq Capital Market: NBBK) is the registered bank holding company of Needham Bank. Needham Bank is headquartered in Needham, Massachusetts, which is approximately 17 miles southwest of Boston's financial district. Known as the “Builder's Bank,” Needham Bank has been helping individuals, businesses and non-profits build for their futures since 1892. Needham Bank offers an array of tech-forward products and services that businesses and consumers use to manage their financial needs. We have the financial expertise typically found at much larger institutions and the local knowledge and commitment you can only find at a community bank. For more information, please visit https://NeedhamBank.com. Needham Bank is a member of FDIC.

Non-GAAP Financial Measures In addition to results presented in accordance with accounting principles generally accepted in the United States of America (“GAAP”), this press release contains certain non-GAAP financial measures, including operating net income, operating noninterest expense, operating noninterest income, operating effective tax rate, operating earnings per share, basic, operating earnings per share, diluted, operating return on average assets, operating return on average shareholders' equity, operating efficiency ratio, tangible shareholders' equity, tangible assets and tangible book value per share. The Company's management believes that the supplemental non-GAAP information is utilized by regulators and market analysts to evaluate a Company's financial condition and therefore, such information is useful to investors. These disclosures should not be viewed as a substitute for financial results determined in accordance with GAAP, nor are they necessarily comparable to non-GAAP performance measures that may be presented by other companies. Because non-GAAP financial measures are not standardized, it may not be possible to compare these financial measures with other companies' non-GAAP financial measures having the same or similar names.

Forward-Looking Statements Statements in this press release that are not historical facts are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, and are intended to be covered by the safe harbor provisions of the Private Securities Litigation Reform Act of 1995.

We may also make forward-looking statements in other documents we file with the Securities and Exchange Commission (the “SEC”), in our annual reports to our stockholders, in press releases and other written materials, and in oral statements made by our officers, directors or employees. You can identify forward-looking statements by the use of the words “believe,” “expect,” “anticipate,” “intend,” “estimate,” “assume,” “outlook,” “will,” “should,” and other expressions that predict or indicate future events and trends and which do not relate to historical matters. Although the Company believes that these forward-looking statements are based on reasonable estimates and assumptions, they are not guarantees of future performance and are subject to known and unknown risks, uncertainties, and other factors. You should not place undue reliance on our forward-looking statements. You should exercise caution in interpreting and relying on forward-looking statements because they are subject to significant risks, uncertainties and other factors which are, in some cases, beyond the Company's control. The Company's actual results could differ materially from those projected in the forward-looking statements as a result of, among other factors, changes in general business and economic conditions on a national basis and in the local markets in which the Company operates, including changes which adversely affect borrowers' ability to service and repay loans; changes in customer behavior due to political, business and economic conditions, including inflation and concerns about liquidity; turbulence in the capital and debt markets; reductions in net interest income resulting from interest rate volatility as well as changes in the balances and mix of loans and deposits; changes in interest rates and real estate values; changes in loan collectability and increases in defaults and charge-off rates; decreases in the value of securities and other assets, adequacy of credit loss reserves, or deposit levels necessitating increased borrowing to fund loans and investments; failure to consummate or a delay in consummating the acquisition of Provident, including as a result of any failure to obtain the necessary regulatory approvals, or to satisfy any of the other conditions to the proposed transaction on a timely basis or at all; risks related to the Company's pending acquisition of Provident and acquisitions generally, including disruption to current plans and operations; difficulties in customer and employee retention; fees, expenses and charges related to these transactions being significantly higher than anticipated; unforeseen integration issues or impairment of other intangibles; and the Company's inability to achieve expected revenues, cost savings, synergies, and other benefits at levels or within the timeframes originally anticipated; changing government regulation; competitive pressures from other financial institutions; changes in legislation or regulation and accounting principles, policies and guidelines; cybersecurity incidents, fraud, natural disasters, and future pandemics; the risk that the Company may not be successful in the implementation of its business strategy; the risk that intangibles recorded in the Company's financial statements will become impaired; changes in assumptions used in making such forward-looking statements; and the other risks and uncertainties detailed in the Company's Form 10-K and updated by our Quarterly Report on Form 10-Q and other filings submitted to the SEC. These statements speak only as of the date of this release and the Company does not undertake any obligation to update or revise any of these forward-looking statements to reflect events or circumstances occurring after the date of this communication or to reflect the occurrence of unanticipated events.

NB BANCORP, INC.SELECTED FINANCIAL HIGHLIGHTS(Unaudited)(Dollars in thousands, except per share data) As of and for the three months ended September30,2025 June30,2025 September30,2024Earnings dataNet interest income $ 48,175 $ 47,007 $ 41,324Noninterest income 3,551 4,178 1,265Total revenue 51,726 51,185 42,589Provision for credit losses 1,396 3,161 2,623Noninterest expense 30,368 29,305 24,586Pre-tax income 19,962 18,719 15,380Net income 15,362 14,579 8,383Operating net income (non-GAAP) 16,002 15,043 13,116Operating noninterest expense (non-GAAP) 30,113 28,775 25,499Per share dataEarnings per share, basic $ 0.43 $ 0.39 $ 0.21Earnings per share, diluted 0.43 0.39 0.21Operating earnings per share, basic (non-GAAP) 0.45 0.40 0.33Operating earnings per share, diluted (non-GAAP) 0.45 0.40 0.33Book value per share 18.51 18.09 17.50Tangible book value per share (non-GAAP) 18.48 18.06 17.48ProfitabilityReturn on average assets 1.16% 1.13% 0.68%Operating return on average assets (non-GAAP) 1.20% 1.17% 1.07%Return on average shareholders' equity 8.35% 7.84% 4.42%Operating return on average shareholders' equity (non-GAAP) 8.70% 8.09% 6.91%Net interest margin 3.78% 3.82% 3.51%Cost of deposits 2.92% 3.00% 3.37%Efficiency ratio 58.71% 57.25% 57.73%Operating efficiency ratio (non-GAAP) 58.22% 56.22% 57.36%Balance sheet, end of periodTotal assets $ 5,442,390 $ 5,226,554 $ 5,002,394Total loans 4,716,129 4,541,175 4,249,074Total deposits 4,565,664 4,268,052 4,042,654Total shareholders' equity 737,034 737,122 747,449Asset qualityAllowance for credit losses (ACL) $ 43,052 $ 42,601 $ 37,605ACL / Total non-performing loans (NPLs) 379.1% 341.4% 234.9%Total NPLs / Total loans 0.24% 0.27% 0.38%Annualized net (charge-offs) recoveries / Average total loans (0.05)% 0.00% (0.50)%Capital ratiosShareholders' equity / Total assets 13.54% 14.10% 14.94%Tangible shareholders' equity / tangible assets (non-GAAP) 13.53% 14.09% 14.92%
NB BANCORP, INC.CONSOLIDATED BALANCE SHEETS(Unaudited)(Dollars in thousands, except share and per share data) As of September30,2025 change from September30,2025 June30,2025 September30,2024 June30,2025 September30,2024AssetsCash and due from banks $ 197,548 $ 157,112 $ 148,187 $ 40,436 25.7% $ 49,361 33.3%Federal funds sold 97,829 101,587 168,862 (3,758) (3.7)% (71,033) (42.1)%Total cash and cash equivalents 295,377 258,699 317,049 36,678 14.2% (21,672) (6.8)%Available-for-sale securities, at fair value 231,023 235,408 202,541 (4,385) (1.9)% 28,482 14.1%Loans receivable, net of deferred fees 4,716,129 4,541,175 4,249,074 174,954 3.9% 467,055 11.0%Allowance for credit losses (43,052) (42,601) (37,605) (451) 1.1% (5,447) 14.5%Net loans 4,673,077 4,498,574 4,211,469 174,503 3.9% 461,608 11.0%Accrued interest receivable 21,074 20,386 18,671 688 3.4% 2,403 12.9%Banking premises and equipment, net 33,842 34,289 34,802 (447) (1.3)% (960) (2.8)%Non-public investments 44,531 35,767 24,271 8,764 24.5% 20,260 83.5%Bank-owned life insurance (“BOLI”) 56,342 55,711 101,736 631 1.1% (45,394) (44.6)%Prepaid expenses and other assets 58,481 58,075 74,387 406 0.7% (15,906) (21.4)%Deferred income tax asset 28,643 29,645 17,468 (1,002) (3.4)% 11,175 64.0%Total assets $ 5,442,390 $ 5,226,554 $ 5,002,394 $ 215,836 4.1% $ 439,996 8.8%Liabilities and shareholders' equityDepositsCore deposits $ 4,176,991 $ 4,013,892 $ 3,712,904 $ 163,099 4.1% $ 464,087 12.5%Brokered deposits 388,673 254,160 329,750 134,513 52.9% 58,923 17.9%Total deposits 4,565,664 4,268,052 4,042,654 297,612 7.0% 523,010 12.9%Mortgagors' escrow accounts 4,543 4,117 4,401 426 10.3% 142 3.2%FHLB borrowings 41,453 127,600 116,335 (86,147) (67.5)% (74,882) (64.4)%Accrued expenses and other liabilities 73,139 68,234 69,524 4,905 7.2% 3,615 5.2%Accrued retirement liabilities 20,557 21,429 22,031 (872) (4.1)% (1,474) (6.7)%Total liabilities 4,705,356 4,489,432 4,254,945 215,924 4.8% 450,411 10.6%Shareholders' equity:Preferred stock, $0.01 par value, 5,000,000 shares authorized; no sharesissued and outstanding – – – – 0.0% – 0.0%Common stock, $0.01 par value, 120,000,000 shares authorized; 39,826,446 issued andoutstanding at September 30, 2025, 40,748,380 issued and outstanding at June 30, 2025and 42,705,729 issued and outstanding at September 30, 2024 398 407 427 (9) (2.2)% (29) (6.8)%Additional paid-in capital 342,526 358,793 417,013 (16,267) (4.5)% (74,487) (17.9)%Unallocated common shares held by the Employee Stock Ownership Plan (“ESOP”) (43,049) (43,643) (45,407) 594 (1.4)% 2,358 (5.2)%Retained earnings 440,281 427,707 382,561 12,574 2.9% 57,720 15.1%Accumulated other comprehensive loss (3,122) (6,142) (7,145) 3,020 (49.2)% 4,023 (56.3)%Total shareholders' equity 737,034 737,122 747,449 (88) 0.0% (10,415) (1.4)%Total liabilities and shareholders' equity $ 5,442,390 $ 5,226,554 $ 5,002,394 $ 215,836 4.1% $ 439,996 8.8%
NB BANCORP, INC.CONSOLIDATED STATEMENTS OF INCOME(Unaudited)(Dollars in thousands, except share and per share data) For the Three Months Ended Three Months Ended September30,2025 Change From Three Months Ended September30,2025 June30,2025 September30,2024 June30,2025 September30,2024INTEREST AND DIVIDEND INCOMEInterest and fees on loans $ 77,365 $ 74,719 $ 70,518 $ 2,646 3.5% $ 6,847 9.7%Interest on securities 2,253 2,307 1,768 (54) (2.3)% 485 27.4%Interest and dividends on cash equivalents and other 2,070 2,822 3,717 (752) (26.6)% (1,647) (44.3)%Total interest and dividend income 81,688 79,848 76,003 1,840 2.3% 5,685 7.5%INTEREST EXPENSEInterest on deposits 31,273 31,690 33,612 (417) (1.3)% (2,339) (7.0)%Interest on borrowings 2,240 1,151 1,067 1,089 94.6% 1,173 109.9%Total interest expense 33,513 32,841 34,679 672 2.0% (1,166) (3.4)%NET INTEREST INCOME 48,175 47,007 41,324 1,168 2.5% 6,851 16.6%PROVISION FOR CREDIT LOSSESProvision for credit losses – loans 1,041 4,244 4,997 (3,203) (75.5)% (3,956) (79.2)%Provision for (release of) credit losses – unfunded commitments 355 (1,083) (2,374) 1,438 132.8% 2,729 (115.0)%Total provision for credit losses 1,396 3,161 2,623 (1,765) (55.8)% (1,227) (46.8)%NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES 46,779 43,846 38,701 2,933 6.7% 8,078 20.9%NONINTEREST INCOMECustomer service fees 2,498 2,554 1,963 (56) (2.2)% 535 27.3%Increase in cash surrender value of BOLI 631 787 414 (156) (19.8)% 217 52.4%Mortgage banking income 193 141 367 52 36.9% (174) (47.4)%Swap contract income 208 524 375 (316) (60.3)% (167) (44.5)%Loss on sale of available-for-sale securities, net – – (1,868) – 100.0% 1,868 (100.0)%Other income 21 172 14 (151) (87.8)% 7 50.0%Total noninterest income 3,551 4,178 1,265 (627) (15.0)% 2,286 180.7%NONINTEREST EXPENSESalaries and employee benefits 18,641 18,567 17,202 74 0.4% 1,439 8.4%Director and professional service fees 2,920 2,943 1,995 (23) (0.8)% 925 46.4%Occupancy and equipment expenses 1,559 1,465 1,394 94 6.4% 165 11.8%Data processing expenses 2,911 2,493 2,226 418 16.8% 685 30.8%Marketing and charitable contribution expenses 949 954 842 (5) (0.5)% 107 12.7%FDIC and state insurance assessments 928 883 812 45 5.1% 116 14.3%Merger and acquisition expenses 994 530 – 464 87.5% 994 0.0%General and administrative expenses 1,466 1,470 115 (4) (0.3)% 1,351 1174.8%Total noninterest expense 30,368 29,305 24,586 1,063 3.6% 5,782 23.5%INCOME BEFORE TAXES 19,962 18,719 15,380 1,243 6.6% 4,582 29.8%INCOME TAX EXPENSE 4,600 4,140 6,997 460 11.1% (2,397) (34.3)%NET INCOME $ 15,362 $ 14,579 $ 8,383 $ 783 5.4% $ 6,979 83.3%Weighted average common shares outstanding, basic 35,372,205 37,191,460 39,289,271 (1,819,255) (4.9)% (3,917,066) (10.0)%Weighted average common shares outstanding, diluted 35,579,456 37,550,409 39,289,271 (1,970,953) (5.2)% (3,709,815) (9.4)%Earnings per share, basic $ 0.43 $ 0.39 $ 0.21 $ 0.04 10.3% $ 0.22 104.8%Earnings per share, diluted $ 0.43 $ 0.39 $ 0.21 $ 0.04 10.3% $ 0.22 104.8%
NBBANCORP, INC.AVERAGE BALANCES, INTEREST EARNED/PAID & AVERAGE YIELDS(Unaudited)(Dollars in thousands) Forthe Three Months Ended September30,2025 June30,2025 September30,2024 Average Average Average Outstanding Average Outstanding Average Outstanding Average Balance Interest Yield/Rate(4) Balance Interest Yield/Rate(4) Balance Interest Yield/Rate(4)Interest-earning assets:Loans $ 4,612,837 $ 77,365 6.65 % $ 4,479,682 $ 74,719 6.69 % $ 4,188,504 $ 70,518 6.70 %Securities 236,187 2,253 3.78 % 232,812 2,307 3.97 % 204,273 1,768 3.44 %Other investments (5) 32,510 223 2.72 % 28,450 605 8.53 % 26,239 223 3.38 %Short-term investments (5) 176,884 1,847 4.14 % 199,271 2,217 4.46 % 264,394 3,494 5.26 %Total interest-earning assets 5,058,418 81,688 6.41 % 4,940,215 79,848 6.48 % 4,683,410 76,003 6.46 %Non-interest-earning assets 256,763 277,787 245,138Allowance for credit losses (42,746) (39,931) (38,495)Total assets $ 5,272,435 $ 5,178,071 $ 4,890,053Interest-bearing liabilities:Savings accounts $ 121,704 181 0.59 % $ 119,736 134 0.45 % $ 112,347 15 0.05 %NOW accounts 467,761 1,365 1.16 % 469,473 1,227 1.05 % 474,697 1,361 1.14 %Money market accounts 1,119,539 9,363 3.32 % 1,090,163 9,094 3.35 % 877,218 7,762 3.52 %Certificates of deposit and individual 1,933,665 20,364 4.18 % 1,964,678 21,235 4.34 % 1,940,992 24,474 5.02 %retirement accountsTotal interest-bearing deposits 3,642,669 31,273 3.41 % 3,644,050 31,690 3.49 % 3,405,254 33,612 3.93 %FHLB and FRB advances 199,852 2,240 4.45 % 103,406 1,151 4.46 % 85,156 1,067 4.98 %Total interest-bearing liabilities 3,842,521 33,513 3.46 % 3,747,456 32,841 3.52 % 3,490,410 34,679 3.95 %Non-interest-bearing deposits 604,631 591,873 566,353Other non-interest-bearing liabilities 95,304 93,072 78,681Total liabilities 4,542,456 4,432,401 4,135,444Shareholders' equity 729,979 745,670 754,609Total liabilities and shareholders' equity $ 5,272,435 $ 5,178,071 $ 4,890,053Net interest income $ 48,175 $ 47,007 $ 41,324Net interest rate spread (1) 2.95 % 2.96 % 2.51 %Net interest-earning assets (2) $ 1,215,897 $ 1,192,759 $ 1,193,000Net interest margin (3) 3.78 % 3.82 % 3.51 %Average interest-earning assets to 131.64 % 131.83 % 134.18 %interest-bearing liabilities
(1) Net interest rate spread represents the difference between the weighted average yield on interest-earning assets and the weighted average rate of interest-bearing liabilities.(2) Net interest-earning assets represent total interest-earning assets less total interest-bearing liabilities.(3) Net interest margin represents net interest income divided by average total interest-earning assets.(4) Annualized.(5) Other investments are comprised of FRB stock, FHLB stock and swap collateral accounts. Short-term investments are comprised of cash and cash equivalents.
NBBANCORP, INC.COMMERCIAL REAL ESTATE BY COLLATERAL TYPE(Unaudited)(Dollars in thousands) September30,2025 Owner-Occupied Non-Owner-Occupied Balance PercentageMulti-Family $ – $ 430,428 $ 430,428 23%Cannabis Facility 254,735 9,168 263,903 14%Hospitality 36,173 211,342 247,515 13%Office 25,257 169,408 194,665 11%Industrial 77,488 114,887 192,375 10%Mixed-Use 8,015 160,451 168,466 9%Special Purpose 80,910 56,766 137,676 7%Retail 38,621 86,339 124,960 7%Other 38,605 81,510 120,115 6%Total commercial real estate $ 559,804 $ 1,320,299 $ 1,880,103 100%
Change From June30,2025 Change From September30,2024 Owner- Non-Owner- Balance Percentage Owner- Non-Owner- Balance Percentage Occupied Occupied Occupied OccupiedMulti-Family $ – $ 113,683 $ 113,683 36% $ – $ 157,867 $ 157,867 58%Cannabis Facility (1,022) (5,930) (6,952) (3)% (47,196) (6,166) (53,362) (17)%Hospitality 36,173 39,183 75,356 44% 36,118 54,315 90,433 58%Office (900) 3,609 2,709 1% (5,627) (8,206) (13,833) (7)%Industrial (9,303) (343) (9,646) (5)% (32,603) 61,702 29,099 18%Mixed-Use 372 73 445 0% (494) 96,400 95,906 132%Special Purpose 2,790 (211) 2,579 2% (926) 2,334 1,408 1%Retail (933) (504) (1,437) (1)% 13,477 (4,314) 9,163 8%Other (1,215) 14,431 13,216 12% (4,033) 14,940 10,907 10%Total commercial real $ 25,962 $ 163,991 $ 189,953 11% $ (41,284) $ 368,872 $ 327,588 21%estate
June30,2025 September30,2024 Owner- Non-Owner- Balance Percentage Owner- Non-Owner- Balance Percentage Occupied Occupied Occupied OccupiedMulti-Family $ – $ 316,745 $ 316,745 19% $ – 272,561 $ 272,561 18%Cannabis Facility 255,757 15,098 270,855 16% 301,931 $ 15,334 317,265 20%Hospitality – 172,159 172,159 10% 55 157,027 157,082 10%Office 26,157 165,799 191,956 12% 30,884 177,614 208,498 13%Industrial 86,791 115,230 202,021 12% 110,091 53,185 163,276 11%Mixed-Use 7,643 160,378 168,021 10% 8,509 64,051 72,560 5%Special Purpose 78,120 56,977 135,097 8% 81,836 54,432 136,268 9%Retail 39,554 86,843 126,397 7% 25,144 90,653 115,797 7%Other 39,820 67,079 106,899 6% 42,638 66,570 109,208 7%Total commercial real $ 533,842 $ 1,156,308 $ 1,690,150 100% $ 601,088 $ 951,427 $ 1,552,515 100%estate
NB BANCORP, INC.NON-GAAP RECONCILIATION(Unaudited)(Dollars in thousands) For the Three Months Ended September30,2025 June30,2025 September30,2024Net income (GAAP) $ 15,362 $ 14,579 $ 8,383Add (Subtract):Adjustments to net income:Defined benefit pension termination refund (739) – -State tax expense – voluntary disclosure agreements 561 – -Income tax expense on solar tax credit investment basis reduction – – 2,503BOLI surrender tax and modified endowment contract penalty – 64 1,552Losses on sales of securities available for sale, net – – 1,868Merger and acquisition expenses 994 530 -Adjustment for adoption of ASU 2023-02 – – (913)Total adjustments to net income $ 816 $ 594 $ 5,010Less net tax benefit associated with pre-tax non-GAAP adjustments to net income 176 130 277Non-GAAP adjustments, net of tax 640 464 4,733Operating net income (non-GAAP) $ 16,002 $ 15,043 $ 13,116Weighted average common shares outstanding, basic 35,372,205 37,191,460 39,289,271Weighted average common shares outstanding, diluted 35,579,456 37,550,409 39,289,271Operating earnings per share, basic (non-GAAP) $ 0.45 $ 0.40 $ 0.33Operating earnings per share, diluted (non-GAAP) $ 0.45 $ 0.40 $ 0.33Noninterest expense (GAAP) $ 30,368 $ 29,305 $ 24,586Subtract (Add):Noninterest expense components:Defined benefit pension termination refund $ (739) $ – $ -Merger and acquisition expenses 994 530 -Adjustment for adoption of ASU 2023-02 – – (913)Total impact of non-GAAP noninterest expense adjustments $ 255 $ 530 $ (913)Noninterest expense on an operating basis (non-GAAP) $ 30,113 $ 28,775 $ 25,499Noninterest income (GAAP) $ 3,551 $ 4,178 $ 1,265Subtract (Add):Noninterest income components:Losses on sales of securities available for sale, net – – (1,868)Total impact of non-GAAP noninterest income adjustments $ – $ – $ (1,868)Noninterest income on an operating basis (non-GAAP) $ 3,551 $ 4,178 $ 3,133Operating net income (non-GAAP) $ 16,002 $ 15,043 $ 13,116Average assets 5,272,435 5,178,071 4,890,053Operating return on average assets (non-GAAP) 1.20% 1.17% 1.07%Average shareholders' equity $ 729,979 $ 745,670 $ 754,609Operating return on average shareholders' equity (non-GAAP) 8.70% 8.09% 6.91%Noninterest expense on an operating basis (non-GAAP) $ 30,113 $ 28,775 $ 25,499Total revenue (net interest income plus total noninterest income) 51,726 51,185 44,457Operating efficiency ratio (non-GAAP) 58.22% 56.22% 57.36%Income tax expense (GAAP) $ 4,600 $ 4,140 $ 6,997Subtract (Add):State tax expense – voluntary disclosure agreements 561 – -Income tax expense on solar tax credit investment basis reduction – – 2,503BOLI surrender tax and modified endowment contract penalty – 64 1,552Total impact of non-GAAP income tax expense adjustments $ 561 $ 64 $ 4,055Income tax expense on an operating basis (non-GAAP) $ 4,039 $ 4,076 $ 2,942Operating effective tax rate (non-GAAP) 20.2% 21.8% 19.1% As of September30,2025 June30,2025 September30,2024Total shareholders' equity (GAAP) $ 737,034 $ 737,122 $ 747,449Subtract:Intangible assets (core deposit intangible) 967 1,005 1,116Total tangible shareholders' equity (non-GAAP) 736,067 736,117 746,333Total assets (GAAP) 5,442,390 5,226,554 5,002,394Subtract:Intangible assets (core deposit intangible) 967 1,005 1,116Total tangible assets (non-GAAP) $ 5,441,423 $ 5,225,549 $ 5,001,278Tangible shareholders' equity / tangible assets (non-GAAP) 13.53% 14.09% 14.92%Total common shares outstanding 39,826,446 40,748,380 42,705,729Tangible book value per share (non-GAAP) $ 18.48 $ 18.06 $ 17.48
NBBANCORP, INC.ASSET QUALITY – NON-PERFORMING ASSETS(1)(Unaudited)(Dollars in thousands) September30,2025 June30,2025 September30,2024Real estate loans:One-to-four-family residential $ 2,771 $ 3,030 $ 5,070Home equity 1,001 1,368 1,060Commercial real estate 809 1,984 3,030Construction and land development 10 10 10Commercial and industrial 4,686 4,558 4,743Consumer 2,080 1,528 2,099Total $ 11,357 $ 12,478 $ 16,012Total non-performing loans to total loans 0.24% 0.27% 0.38%Total non-performing assets to total assets 0.21% 0.24% 0.32%
(1) Non-performing loans and assets are comprised of non-accrual loans
NBBANCORP, INC.ASSET QUALITY – PROVISION, ALLOWANCE, AND NET (CHARGE-OFFS) RECOVERIES(Unaudited)(Dollars in thousands) Forthe Three Months Ended September30,2025 June30,2025 September30,2024Allowance for credit losses at beginning of the period $ 42,601 $ 38,338 $ 37,857Provision for credit losses 1,041 4,244 4,997Charge-offs:Consumer 693 1,190 1,305Commercial real estate – – 4,000Total charge-offs 693 1,190 5,305Recoveries of loans previously charged off:Commercial and industrial 12 12 12Commercial real estate – 923 -Consumer 91 274 44Total recoveries 103 1,209 56Net (charge-offs) recoveries (590) 19 (5,249)Allowance for credit losses at end of the period $ 43,052 $ 42,601 $ 37,605Allowance to non-performing loans 379% 341% 234.9%Allowance to total loans outstanding at the end of the period 0.91% 0.94% 0.89%Annualized net (charge-offs) recoveries to average loans outstanding (0.05)% 0.00% (0.50)%during the period

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