X0508 4 2026-02-03 false 0001795815 California BanCorp \ CA BCAL 0001733127 Volk David J. C/O CALIFORNIA BANCORP 355 S. GRAND AVE STE 1200 LOS ANGELES CA 90071 true false false false false Common Stock 2026-01-28 4 S false 2346104.00 18.95 D 3729.00 I By Castle Creek Advisors IV LLC and Castle Creek Capital Partners VI LP Common Stock 2026-02-03 4 P false 27000.00 18.64 A 28195.00 D Stock Options 12.96 2024-02-20 2029-02-20 Common Stock 7500.00 7500.00 D Stock Options 9.67 2022-03-15 2027-03-15 Common Stock 10000.00 10000.00 D These securities were held by Castle Creek Advisors IV LLC and Castle Creek Capital Partners VI LP. Mr. Volk, a managing principal of Castle Creek, disclaims beneficial ownership of such shares held by Castle Creek Advisors IV LLC and Castle Creek Capital Partners VI LP, except to the extent of his pecuniary interest therein and this report shall not be deemed an admission that the reporting person is the beneficial owner of such securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose. These unvested restricted stock units were assigned to Castle Creek Advisors IV LLC, on behalf of David Volk in his capacity as a member of the Board of Directors of California BanCorp, Inc. and will become fully vested on May 21, 2026. Manisha Merchant, by POA for David Volk 2026-02-05