Exhibit 99.1

CALIFORNIA BANCORP REPORTS STRONG SECOND QUARTER EARNINGS, SIGNIFICANT LOAN GROWTH AND IMPROVED CREDIT QUALITY

— Company to increase its quarterly dividend by $0.02 to $0.12 per common share in the third quarter of 2026

San Diego, Calif., July 27, 2026 – California BanCorp (“us,” “we,” “our,” or the “Company”) (NASDAQ: BCAL), the holding company for California Bank of Commerce, N.A. (the “Bank”) announces its consolidated financial results for the second quarter of 2026.

The Company reported net income of $14.3 million, or $0.44 per diluted share, for the second quarter of 2026, compared to $13.8 million, or $0.42 per diluted share for the first quarter of 2026, and $14.1 million, or $0.43 per diluted share for the second quarter of 2025.

“I am pleased to report a very solid second quarter by the Bank, highlighted by strong earnings of $14.3 million, meaningful loan growth of $113.7 million, and a significant improvement in credit quality, with nonperforming assets to total assets decreasing more than 50% to 0.44% from 0.97%,” said David Rainer, Chairman and CEO of the Company and Bank. “I’m also pleased to report our loan growth was well balanced, reflecting our ability to generate new banking relationships with businesses throughout our footprint. Given our strong performance and capital position, we are increasing our quarterly dividend to $0.12 beginning in the third quarter.”

“We continue to focus on our organic growth strategy, with top tier bankers in each of our California markets,” said Richard Hernandez, President of the Company and Bank. “Despite strong competition in our footprint, our team successfully generated new client relationships and increased business development activity in each of our regional commercial banking offices. We remain confident in the strength of our franchise and our ability to continue growing in a disciplined and profitable manner.”

Second Quarter 2026 Highlights

¹ Reconciliations of non–U.S. generally accepted accounting principles (“GAAP”) measures are set forth at the end of this press release.

The Company’s Board of Directors approved the regular quarterly cash dividend of $0.12 per share to holders of its common stock, an increase of $0.02 per share from the prior quarter. The dividend is expected to be paid on October 15, 2026, to shareholders of record at the close of the business day on September 21, 2026.

Second Quarter Operating Results

Net Income

Net income for the second quarter of 2026 was $14.3 million, or $0.44 per diluted share, compared with $13.8 million, or $0.42 per diluted share in the first quarter of 2026. Pre-tax, pre-provision income (non-GAAP¹) for the second quarter was $20.6 million, an increase of $1.9 million, or 9.89%, from the prior quarter. The net income and diluted earnings per share increase were largely driven by higher net interest income, and lower noninterest expense, partially offset by a higher provision for credit losses and lower noninterest income.

Net Interest Income and Net Interest Margin

Net interest income for the second quarter of 2026 was $43.4 million, compared with $42.1 million in the prior quarter. The increase in net interest income was primarily due to a $1.1 million increase in total interest and dividend income, coupled with a $123 thousand decrease in total interest expense in the second quarter of 2026, as compared with the prior quarter. The increase in net interest income was also impacted by one additional day in the current quarter compared with the prior quarter.

During the second quarter of 2026, total interest income increased by $1.1 million. The increase was primarily driven by a $2.3 million increase in loan interest income, which included an increase of $98 thousand in accretion from the net purchase accounting discounts on acquired loans and $600 thousand in cash interest collections from the payoff of two nonaccrual loans, net of $56 thousand in reversals of interest income on loans placed on nonaccrual, coupled with an increase of $749 thousand in total debt securities income. These increases were partially offset by a decrease of $1.7 million in interest income from deposits in other financial institutions and a decrease of $225 thousand in dividend income from restricted stock investments and other bank stock. The increase in interest income was mainly due to a 25 basis point increase in the yield on average total interest-earning assets, including increases in average total loans of $23.6 million, and average total debt securities of $49.4 million, offset by decreases in average deposits in other financial institutions of $195.9 million and average Fed funds sold/resale agreements of $4.1 million. The decrease in interest expense for the second quarter of 2026 was primarily due to a $119 thousand decrease in interest expense on average total interest-bearing deposits, the result of lower average total interest-bearing deposits of $132.4 million, partially offset by an 8 basis point increase in the cost of average total interest-bearing deposits.

Net interest margin for the second quarter of 2026 was 4.71%, compared with 4.47% in the prior quarter. The expansion of the net interest margin by 24 basis points was primarily driven by higher loan yields, a 6 basis point increase from the resolution of certain nonaccrual loans, and continued benefit from purchase accounting accretion. Total interest-earning assets yield increased by 25 basis points, partially offset by a 2 basis point increase in the cost of funds. The yield on total average interest-earning assets in the second quarter of 2026 was 5.97%, compared with 5.72% in the prior quarter. The yield on average total loans in the second quarter of 2026 was 6.34%, an increase of 20 basis points from 6.14% in the prior quarter. The yield on average total loans in the second quarter of 2026 included the impact of the cash interest collection from the payoff of two nonaccrual loans, net of reversals of interest income on loans placed on nonaccrual noted above, which increased the overall total loan yield by 7 basis points. There was a $479 thousand reversal of interest income in the prior quarter which negatively impacted the net interest margin by 6 basis points. Accretion income from the net purchase accounting discounts on acquired loans was $3.3 million, increasing the yield on average total loans by 44 basis points; the net amortization expense from the purchase accounting discounts on acquired subordinated debt and acquired time deposits premium increased interest expense by $389 thousand, the combination of which increased the net interest margin by 32 basis points in the second quarter of 2026. In the prior quarter, accretion income from the net purchase accounting discounts on acquired loans was $3.2 million, increasing the yield on average total loans by 44 basis points; the net amortization expense from the purchase accounting discounts on acquired subordinated debt and acquired time deposits premium increased the interest expense by $388 thousand, the combination of which increased the net interest margin by 30 basis points.

Cost of funds for the second quarter of 2026 was 1.38%, an increase of 2 basis points from 1.36% in the prior quarter. The increase was primarily driven by an 8 basis point increase in the cost of average total interest-bearing deposits. The amortization expense of $389 thousand from the purchase accounting discounts on acquired subordinated debt and acquired time deposits premium contributed 5 basis points to the cost of funds. Average noninterest-bearing demand deposits increased $18.6 million to $1.22 billion and represented 36.7% of total average deposits for the second quarter of 2026, compared with $1.21 billion and 34.9%, respectively, in the prior quarter; average interest-bearing deposits decreased $132.4 million to $2.11 billion during the second quarter of 2026. The total cost of deposits in the second quarter of 2026 was 1.31%, compared with 1.29% in the prior quarter. The cost of total interest-bearing deposits increased 8 basis points, driven primarily by changes in the Company’s deposit mix and overall competition for deposits driving market deposit rates upward in the second quarter of 2026.

Average total borrowings increased $51 thousand to $34.4 million in the second quarter of 2026, primarily due to a $384 thousand increase in average subordinated debt due to accretion of discounts, partially offset by a $333 thousand decrease in average Federal Home Loan Bank (“FHLB”) advances from an overnight advance. The average cost of total borrowings was 8.10% for the second quarter of 2026, down from 8.25% in the prior quarter.

Provision for Credit Losses

The Company recorded a provision for credit losses of $714 thousand for the second quarter of 2026, compared with a reversal of provision for credit losses of $381 thousand in the prior quarter. The provision for credit losses in the second quarter of 2026 was comprised of a $1.1 million provision for credit losses on loans held for investment, partially offset by a $336 thousand reversal of provision for credit losses for unfunded loan commitments during the second quarter of 2026. Total unfunded loan commitments decreased by $28.2 million to $896.9 million at June 30, 2026, compared to $925.1 million in unfunded loan commitments at March 31, 2026.

The provision for credit losses for loans held for investment in the second quarter of 2026 was $1.1 million, an increase of $1.4 million from a reversal of provision for credit losses of $381 thousand in the prior quarter. The increase reflected updates to the reasonable and supportable economic forecasts for California, continued loan growth, changes in portfolio composition, and higher substandard accruing loan balances, partially offset by refinements to the qualitative factors and scenario weighting. The Company’s management continues to monitor macroeconomic variables including changes in interest rates, uncertainty in the current economic environment, and elevated geopolitical risks related to ongoing conflicts in the Middle East. Management believes it has appropriately provisioned for the current environment.

Noninterest Income

Total noninterest income was $1.6 million in the second quarter of 2026, a decrease of $586 thousand compared with $2.1 million in the first quarter of 2026. Other charges and fees decreased $534 thousand in the second quarter due primarily to a loss from equity investments of $251 thousand in the second quarter of 2026 compared to income of $181 thousand in the prior quarter.

Noninterest Expense

Total noninterest expense for the second quarter of 2026 was $24.3 million, a decrease of $1.2 million from total noninterest expense of $25.5 million in the prior quarter. Salaries and employee benefits decreased $1.0 million during the second quarter of 2026 to $15.5 million primarily because the previous quarter included increases in payroll taxes typically occurring in the first quarter each year, coupled with the increase in loan origination costs deferred based on increased loan origination activity. The decrease in other expenses of $424 thousand was due primarily to the decreases in loan related expenses and valuation write-downs on loans held for sale. There were no valuation write-downs on loans held for sale in the second quarter of 2026, compared with $266 thousand in the prior quarter.

Efficiency ratio (non-GAAP¹) for the second quarter of 2026 was 54.22%, compared with 57.69% in the prior quarter.

Income Tax

In the second quarter of 2026, the Company’s income tax expense was $5.5 million, compared with $5.3 million for the first quarter of 2026. The effective rate was 27.9% for the second quarter of 2026 and 27.8% for the first quarter of 2026.

Balance Sheet

Assets

Total assets at June 30, 2026 were $4.03 billion, a decrease of $23.5 million or 0.6% from March 31, 2026. The decrease in total assets from the prior quarter was primarily related to decreases in cash and cash equivalents of $146.2 million, partially offset by a $113.7 million increase in loans, including loans held for sale and a $10.2 million increase in available-for-sale debt securities.

Loans

Total loans held for investment (“LHFI”) were $3.09 billion at June 30, 2026, an increase of $121.9 million, compared with March 31, 2026. During the second quarter of 2026, there were new originations of $245.6 million, including $26.5 million of short-term participation purchases in fully collateralized mortgage loans, net advances of $32.4 million, and the transfer of $7.4 million of SBA 7(a) loans from loans held for sale to loans held for investment at net amortized cost. These increases were partially offset by $163.3 million loan payoffs, including a $5.7 million discounted note sale that resulted in a $127 thousand charge-off. Total loans secured by real estate increased by $75.7 million, of which other commercial real estate loans increased $58.2 million; multifamily loans increased $13.3 million, and 1-4 family residential loans increased by $10.7 million; commercial and industrial loans increased by $45.6 million, including $26.5 million of aforementioned participation purchases in mortgage loans through approved warehouse facilities; and other consumer loans increased by $629 thousand. These increases were partially offset by a decrease in construction and land development loans of $6.5 million.

The Company had $15.8 million in loans held for sale at June 30, 2026, consisting entirely of consumer solar loans, compared with $24.1 million at March 31, 2026, consisting of $7.6 million of SBA 7(a) loans and $16.5 million of consumer solar loans. During the second quarter of 2026, the Company transferred its $7.4 million SBA 7(a) loans held for sale to loans held for investment at net amortized cost. The Company did not record a valuation write-down related to its consumer solar loans in the second quarter of 2026. In the first quarter of 2026, the Company recorded a valuation allowance of $266 thousand related to these loans.

Deposits

Total deposits at June 30, 2026 were $3.36 billion, a decrease of $34.4 million from March 31, 2026. The decrease was primarily due to decreases in interest-bearing non-maturity deposits of $30.0 million, non-brokered time deposits of $13.9 million, partially offset by an increase in noninterest-bearing demand deposits of $9.5 million. Noninterest-bearing demand deposits at June 30, 2026, were $1.26 billion, or 37.4% of total deposits, compared with $1.25 billion, or 36.8% of total deposits at March 31, 2026. At June 30, 2026, total interest-bearing deposits were $2.10 billion, compared with $2.15 billion at March 31, 2026. At June 30, 2026, the Company did not have any brokered time deposits. The Company offers the Insured Cash Sweep product and Certificate of Deposit Account Registry Service, each of which provides reciprocal deposit placement services to fully qualified large customer deposits for FDIC insurance among other participating banks. Total reciprocal deposits were $705.2 million, or 21.0% of total deposits at June 30, 2026, compared with $723.7 million, or 21.3% of total deposits at March 31, 2026.

Federal Home Loan Bank (“FHLB”) and Liquidity

At June 30, 2026 and March 31, 2026, the Company had no FHLB or Federal Reserve Discount Window borrowings.

At June 30, 2026, the Company had available borrowing capacity from an FHLB secured line of credit of approximately $719.8 million and available borrowing capacity from the Federal Reserve Discount Window of approximately $329.7 million. The Company also had available borrowing capacity from four unsecured credit lines from correspondent banks of approximately $90.5 million at June 30, 2026, with no outstanding borrowings. Total available borrowing capacity was $1.14 billion at June 30, 2026. Additionally, the Company had unpledged liquid securities at fair value of approximately $211.0 million and cash and cash equivalents of $265.0 million at June 30, 2026.

The Company intends to redeem all $35.0 million of its 3.50% fixed-to-floating rate subordinated debt due September 1, 2031, at par value during the third quarter of 2026. Starting in September 2026, the interest rate on that subordinated debt is scheduled to transition from a fixed rate to a quarterly variable rate equal to the then current 90-day SOFR plus 2.86%, through the contractual maturity date of September 1, 2031.

Asset Quality

Total non-performing assets were $17.5 million, or 0.44% of total assets at June 30, 2026, a decrease of $21.7 million, or 55.3%, from $39.2 million, or 0.97% of total assets, at March 31, 2026. Total non-performing loans were $8.9 million, or 0.29% of total loans held for investment at June 30, 2026, compared with $30.6 million, or 1.03% of total loans held for investment at March 31, 2026.

Total nonperforming loans decreased $21.7 million, or 70.9%, during the second quarter of 2026 primarily reflecting the resolution of three nonperforming commercial real estate loans that had been downgraded in the prior quarter, including the full repayment of two loans with a combined net carrying value of $17.8 million and the discounted note sale of a $5.7 million loan, which resulted in a $127 thousand charge-off. In addition, existing nonperforming loans had net paydowns of $758 thousand during the quarter. These decreases were partially offset by the downgrade of a 1-4 family residential investment loan with a net carrying value of $2.7 million at June 30, 2026. This loan is classified as an individually evaluated, collateral-dependent loan and no allowance was recorded at June 30, 2026, as a full repayment is anticipated.

Special mention loans decreased by $5.0 million during the second quarter of 2026 to $48.6 million at June 30, 2026. The decrease in the special mention loans was due mostly to $7.7 million of loans downgraded to substandard, coupled with $3.7 million in payoffs and $70 thousand in upgrades to pass rating, partially offset by $5.1 million of loans downgraded from pass rating, and $1.3 million in net advances,

Substandard loans decreased by $8.2 million during the second quarter of 2026 to $64.2 million at June 30, 2026. The decrease in the substandard loans was due primarily to the aforementioned payoffs and discounted note sales of three nonperforming commercial real estate loans totaling $23.6 million, coupled with $6.0 million of other payoffs and $1.2 million of net paydowns, partially offset by $14.9 million of downgrades from pass risk rating to substandard accruing and $7.7 million of downgrades from special mention to substandard accruing.

The Company had no LHFI that were over 90 days past due and still accruing interest at June 30, 2026 and March 31, 2026, respectively.

Loan delinquencies (30-89 days past due, excluding nonaccrual loans) totaled $4.9 million at June 30, 2026, compared with $12.8 million in such loan delinquencies at March 31, 2026. The decrease was primarily due to $10.0 million of loans brought to current, and $2.7 million of 1-4 family residential loan downgraded to nonaccrual, partially offset by $4.5 million of loans that became delinquent during the second quarter of 2026.

The allowance for credit losses, which is comprised of the ALL and reserve for unfunded loan commitments, totaled $36.6 million at June 30, 2026, compared with $36.1 million at March 31, 2026. The $522 thousand increase in the allowance for credit losses included a $1.1 million provision for credit losses for the loan portfolio, net charge-offs of $192 thousand, and a $336 thousand reversal of provision for credit losses for unfunded loan commitments for the quarter ended June 30, 2026.

The ALL was $34.9 million, or 1.13% of total loans held for investment at June 30, 2026, compared with $34.0 million, or 1.14% at March 31, 2026.

Capital

Tangible book value per common share (non-GAAP¹) at June 30, 2026 was $14.29, compared with $13.97 at March 31, 2026. In the second quarter of 2026, tangible book value was primarily impacted by net income of $14.3 million for the second quarter, and stock-based compensation activity. This was partially offset by an increase in net of tax unrealized losses on available-for-sale debt securities, the Company’s stock repurchase program activity, and cash dividends, which reduced the tangible book value per common share by $0.05, $0.06 and $0.10, respectively. Other comprehensive losses related to net of tax unrealized losses on available-for-sale debt securities increased by $1.5 million to $5.3 million at June 30, 2026, from $3.8 million at March 31, 2026. The increase in the net of tax unrealized losses on available-for-sale debt securities was attributable to non-credit related factors, including a decrease in bond prices at the long end of the yield curve and the general interest rate environment, and growth in the available-for-sale debt securities. Tangible common equity (non-GAAP¹) as a percentage of total tangible assets (non-GAAP¹) at June 30, 2026, increased to 11.77% from 11.46% in the prior quarter, and net of tax unrealized losses on available-for-sale debt securities as a percentage of tangible common equity (non-GAAP¹) at June 30, 2026 increased to 1.2% from 0.8% in the prior quarter.

The Company’s preliminary capital ratios exceed the minimums required to be “well-capitalized” at June 30, 2026.

Stock Repurchase Program

During the second quarter of 2026, the Company repurchased 102,594 shares of its common stock at an average price of $19.46 and a total cost of $2.0 million under the stock repurchase program, compared to 409,915 shares of common stock at an average price of $18.08 and a total cost of $7.4 million in the first quarter of 2026. The remaining maximum number of shares authorized to be repurchased under this program was 875,563 shares at June 30, 2026.

ABOUT CALIFORNIA BANCORP

California BanCorp (NASDAQ: BCAL) is a registered bank holding company headquartered in San Diego, California. California Bank of Commerce, N.A., a national banking association chartered under the laws of the United States (the “Bank”) and regulated by the Office of the Comptroller of the Currency, is a wholly owned subsidiary of California BanCorp. Established in 2001 and headquartered in San Diego, California, the Bank offers a range of financial products and services to individuals, professionals, and small to medium-sized businesses through its 14 branch offices including 11 commercial banking offices serving California. The Bank’s solutions-driven, relationship-based approach to banking provides accessibility to decision makers and enhances value through strong partnerships with its clients. Additional information is available at www.californiabankofcommerce.com.

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

In addition to historical information, this release includes forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements relate to expectations, beliefs, projections, future plans and strategies, anticipated events or trends and other matters that are not historical facts. Examples of forward-looking statements include, among others, statements regarding expectations, plans or objectives for future operations, products or services, loan recoveries, projections, and expectations regarding the adequacy of reserves for credit losses, as well as forecasts relating to financial and operating results or other measures of economic performance. Forward-looking statements reflect management’s current view about future events and involve risks and uncertainties that may cause actual results to differ from those expressed in the forward-looking statement or historical results. Forward-looking statements can be identified by the fact that they do not relate strictly to historical or current facts and often include the words or phrases such as “aim,” “can,” “may,” “could,” “predict,” “should,” “will,” “would,” “believe,” “anticipate,” “estimate,” “expect,” “hope,” “intend,” “plan,” “potential,” “project,” “will likely result,” “continue,” “seek,” “shall,” “possible,” “projection,” “optimistic,” and “outlook,” and variations of these words and similar expressions.

Factors that could cause or contribute to results differing from those in or implied in the forward-looking statements include but are not limited to the impact of bank failures or other adverse developments at other banks on general investor sentiment regarding the stability and liquidity of banks; changes in real estate markets and valuations; the impact on financial markets from geopolitical conflicts; inflation, interest rate, market and monetary fluctuations and general economic conditions, either nationally or locally in the areas in which the Company conducts business; increases in competitive pressures among financial institutions and businesses offering similar products and services; general credit risks related to lending, including changes in the value of real estate or other collateral, the financial condition of borrowers, the effectiveness of our underwriting practices and the risk of fraud; higher than anticipated defaults in the Company’s loan portfolio; changes in management’s estimate of the adequacy of the allowance for credit losses or the factors the Company uses to determine the allowance for credit losses; changes in demand for loans and other products and services offered by the Company; the possibility that the Company may reduce or discontinue the payment of dividends on its common stock; the possibility that the Company may discontinue, reduce or otherwise limit the level of repurchases of its common stock that it may make from time to time pursuant to its stock repurchase program; the costs and outcomes of litigation; legislative or regulatory changes or changes in accounting principles, policies or guidelines; and other risk factors discussed in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025, filed with the Securities and Exchange Commission (“SEC”) and other documents the Company may file with the SEC from time to time.

Additional information regarding these and other risks and uncertainties to which our business and future financial performance are subject is contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025, and other documents the Company files with the SEC from time to time.

Any forward-looking statement made in this release is based only on information currently available to management and speaks only as of the date on which it is made. The Company does not undertake, and specifically disclaims any obligation, to update any forward-looking statements to reflect occurrences or unanticipated events or circumstances after the date of such statements or to conform such forward-looking statements to actual results or to changes in its opinions or expectations, except as required by law.

California BanCorp and Subsidiary

Financial Highlights (Unaudited)

(1) Non-GAAP measure. See – GAAP to Non-GAAP reconciliation.

(1) Included in “Accrued interest and other liabilities” on the consolidated balance sheets.

California BanCorp and Subsidiary

Balance Sheets (Unaudited)

California BanCorp and Subsidiary

Income Statements - Quarterly and Year-to-Date (Unaudited)

(1) Included (reversal of) provision for credit losses on unfunded loan commitments of $(336) thousand, zero and $29 thousand for the three months ended June 30, 2026, March 31, 2026, and June 30, 2025, respectively; and $(336) thousand and $(589) thousand for the six months ended June 30, 2026 and June 30, 2025, respectively.

California BanCorp and Subsidiary

Average Balance Sheets and Yield Analysis

(Unaudited)