Bank of Marin Bancorp
US ˙ NasdaqGS ˙ US0634251021

SecurityBMRC / Bank of Marin Bancorp
InstitutionState Street Corp
Latest Disclosed Ownership340,004 shares
Latest Disclosed Value $ 8,714,303
State Street Corp reports 0.95% increase in ownership of BMRC / Bank of Marin Bancorp

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 340,004 shares of Bank of Marin Bancorp (US:BMRC) valued at $8,714,303 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 336,797 shares of Bank of Marin Bancorp. This represents a change in shares of 0.95% during the quarter. The current value of the position is $8,765,303 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F BANK OF MARIN BANCORP COM 063425102 340,004 3,207 0.95 8,714 -0.53 0.0003
2026-02-13 2025-12-31 13F BANK MARIN BANCORP COM 063425102 336,797 -13,029 -3.72 8,760 3.14 0.0003
2025-11-14 2025-09-30 13F BANK MARIN BANCORP COM 063425102 349,826 905 0.26 8,494 6.58 0.0003
2025-08-14 2025-06-30 13F BANK MARIN BANCORP COM 063425102 348,921 6,261 1.83 7,969 5.38 0.0003
2025-05-15 2025-03-31 13F BANK MARIN BANCORP COM 063425102 342,660 -31,720 -8.47 7,563 -15.02 0.0003
2025-02-14 2024-12-31 13F BANK MARIN BANCORP COM 063425102 374,380 11,270 3.10 8,899 22.00 0.0004
2024-11-14 2024-09-30 13F BANK MARIN BANCORP COM 063425102 363,110 3,073 0.85 7,295 25.15 0.0003
2024-08-14 2024-06-30 13F BANK MARIN BANCORP COM 063425102 360,037 -1,472 -0.41 5,829 -3.86 0.0003
2024-05-15 2024-03-31 13F BANK MARIN BANCORP COM 063425102 361,509 -19,615 -5.15 6,063 -27.76 0.0003
2024-02-14 2023-12-31 13F BANK MARIN BANCORP COM 063425102 381,124 -33,463 -8.07 8,392 10.74 0.0004
2023-11-14 2023-09-30 13F BANK MARIN BANCORP COM 063425102 414,587 545 0.13 7,579 3.58 0.0004
2023-08-14 2023-06-30 13F BANK MARIN BANCORP COM 063425102 414,042 -61,228 -12.88 7,316 -29.67 0.0004
2023-05-15 2023-03-31 13F BANK MARIN BANCORP COM 063425102 475,270 80,654 20.44 10,404 -19.82 0.0006
2023-05-15 2022-12-31 13F/A-99 BANK MARIN BANCORP COM 063425102 394,616 4,283 1.10 12,975 10.98 0.0008
2023-05-15 2022-12-31 13F BANK MARIN BANCORP COM 063425102 394,616 4,283 12,975 0.0008
2022-11-15 2022-09-30 13F BANK MARIN BANCORP COM 063425102 390,333 -14,513 -3.58 11,690 -9.14 0.0007
2022-08-15 2022-06-30 13F BANK MARIN BANCORP COM 063425102 404,846 4,372 1.09 12,866 -8.39 0.0008
2022-05-16 2022-03-31 13F BANK MARIN BANCORP COM 063425102 400,474 -19,559 -4.66 14,045 -10.19 0.0007
2022-02-14 2021-12-31 13F BANK MARIN BANCORP COM 063425102 420,033 121,665 40.78 15,638 38.84 0.0007
2021-11-15 2021-09-30 13F BANK MARIN BANCORP COM 063425102 298,368 23,672 8.62 11,263 28.53 0.0006
2021-08-16 2021-06-30 13F BANK MARIN BANCORP COM 063425102 274,696 5,200 1.93 8,763 -16.96 0.0005
2021-07-09 2021-03-31 13F/A-1 BANK MARIN BANCORP COM 063425102 269,496 -18,557 -6.44 10,553 6.68 0.0006
2021-05-17 2021-03-31 13F BANK MARIN BANCORP COM 063425102 269,496 -18,557 10,553 0.0006
2021-02-16 2020-12-31 13F BANK MARIN BANCORP COM 063425102 288,053 -824 -0.29 9,892 18.24 0.0006
2020-11-10 2020-09-30 13F BANK MARIN BANCORP COM 063425102 288,877 -7,792 -2.63 8,366 -15.39 0.0006
2020-08-14 2020-06-30 13F BANK OF MARIN BANCORP COM 063425102 296,669 -10,576 -3.44 9,888 7.28 0.0007
2020-06-19 2020-03-31 13F/A-1 BANK OF MARIN BANCORP COM 063425102 307,245 2,389 0.78 9,217 -32.89 0.0008
2020-05-11 2020-03-31 13F BANK OF MARIN BANCORP COM 063425102 307,245 2,389 9,217 809.4382
2020-02-06 2019-12-31 13F BANK OF MARIN BANCORP COM 063425102 304,856 18,847 6.59 13,734 15.73 0.0009
2019-11-14 2019-09-30 13F BANK OF MARIN BANCORP COM 063425102 286,009 4,891 1.74 11,867 2.91 0.0009
2019-08-14 2019-06-30 13F BANK OF MARIN BANCORP COM 063425102 281,118 9,297 3.42 11,531 4.26 0.0009
2019-05-15 2019-03-31 13F BANK OF MARIN BANCORP COM 063425102 271,821 14,379 5.59 11,060 4.17 0.0009
2019-02-12 2018-12-31 13F BANK OF MARIN BANCORP COM 063425102 257,442 130,310 102.50 10,617 -0.48 0.0010
2018-11-09 2018-09-30 13F BANK OF MARIN BANCORP Common equity shares 063425102 127,132 317 0.25 10,668 4.05 0.0008
2018-08-14 2018-06-30 13F BANK OF MARIN BANCORP Common equity shares 063425102 126,815 6,239 5.17 10,253 23.32 0.0009
2018-05-15 2018-03-31 13F BANK OF MARIN BANCORP Common equity shares 063425102 120,576 14,547 13.72 8,314 15.31 0.0007
2018-02-14 2017-12-31 13F BANK OF MARIN BANCORP Common equity shares 063425102 106,029 2,873 2.79 7,210 1.99 0.0006
2017-11-14 2017-09-30 13F BANK OF MARIN BANCORP Common equity shares 063425102 103,156 277 0.27 7,069 11.71 0.0006
2017-08-14 2017-06-30 13F BANK OF MARIN BANCORP Common equity shares 063425102 102,879 396 0.39 6,328 -4.06 0.0006
2017-05-15 2017-03-31 13F BANK OF MARIN BANCORP Common equity shares 063425102 102,483 -10,060 -8.94 6,596 -15.97 0.0006
2017-02-09 2016-12-31 13F BANK OF MARIN BANCORP Common equity shares 063425102 112,543 13,526 13.66 7,850 59.39 0.0007
2017-01-13 2016-09-30 13F/A-1 BANK OF MARIN BANCORP Common equity shares 063425102 99,017 1,270 1.30 4,925 4.10 0.0005
2016-11-14 2016-09-30 13F BANK OF MARIN BANCORP Common equity shares 063425102 99,017 4,925
2016-08-12 2016-06-30 13F BANK OF MARIN BANCORP Common equity shares 063425102 97,747 4,686 5.04 4,731 3.21 0.0005
2016-05-20 2016-03-31 13F/A-1 BANK OF MARIN BANCORP Common equity shares 063425102 93,061 1,350 1.47 4,584 -6.43 0.0005
2016-05-12 2016-03-31 13F BANK OF MARIN BANCORP Common equity shares 063425102 93,061 4,584
2016-02-16 2015-12-31 13F BANK OF MARIN BANCORP Common equity shares 063425102 91,711 3,241 3.66 4,899 15.41 0.0005
2015-11-16 2015-09-30 13F BANK OF MARIN BANCORP Common equity shares 063425102 88,470 -1,366 -1.52 4,245 -7.09 0.0005
2015-08-13 2015-06-30 13F BANK OF MARIN BANCORP Common equity shares 063425102 89,836 1,353 1.53 4,569 1.49 0.0005
2015-05-15 2015-03-31 13F BANK OF MARIN BANCORP Common equity shares 063425102 88,483 1,310 1.50 4,502 -1.87 0.0005
2015-02-11 2014-12-31 13F BANK OF MARIN BANCORP Common equity shares 063425102 87,173 1,014 1.18 4,588 15.98 0.0005
2014-11-12 2014-09-30 13F/A-1 BANK OF MARIN BANCORP Common equity shares 063425102 86,159 1,178 1.39 3,956 2.06 0.0004
2014-11-10 2014-09-30 13F BANK OF MARIN BANCORP Common equity shares 063425102 86,159 3,956
2014-08-12 2014-06-30 13F BANK OF MARIN BANCORP Common equity shares 063425102 84,981 430 0.51 3,876 1.71 0.0004
2014-05-15 2014-03-31 13F/A-1 BANK OF MARIN BANCORP Common equity shares 063425102 84,551 2,540 3.10 3,811 7.11 0.0004
2014-05-13 2014-03-31 13F BANK OF MARIN BANCORP Common equity shares 063425102 84,551 3,811
2014-02-06 2013-12-31 13F/A-1 BANK OF MARIN BANCORP Common equity shares 063425102 82,011 91 0.11 3,558 4.59 0.0004
2014-02-06 2013-12-31 13F BANK OF MARIN BANCORP Common equity shares 063425102 85,877 3,216
2013-11-12 2013-09-30 13F BANK OF MARIN BANCORP Common equity shares 063425102 81,920 402 0.49 3,402 4.32 0.0004
2013-08-08 2013-06-30 13F BANK OF MARIN BANCORP Common equity shares 063425102 81,518 81,518 3,261 0.0004
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.