Bank of Marin Bancorp
US ˙ NasdaqGS ˙ US0634251021

SecurityBMRC / Bank of Marin Bancorp
InstitutionMorgan Stanley
Latest Disclosed Ownership240,431 shares
Latest Disclosed Value $ 6,162,262
Morgan Stanley reports 8.30% decrease in ownership of BMRC / Bank of Marin Bancorp

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 240,431 shares of Bank of Marin Bancorp (US:BMRC) valued at $6,162,247 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 262,196 shares of Bank of Marin Bancorp. This represents a change in shares of -8.30% during the quarter. The current value of the position is $6,198,311 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 240,431 -21,765 -8.30 6,162 -9.63 0.0004
2026-05-27 2025-12-31 13F/A-1 BANK MARIN BANCORP COM 063425102 262,196 29,394 12.63 6,820 20.65 0.0004
2026-02-13 2025-12-31 13F BANK MARIN BANCORP COM 063425102 262,196 29,394 6,820 0.0004
2026-05-27 2025-09-30 13F/A-1 BANK MARIN BANCORP COM 063425102 232,802 -40,245 -14.74 5,652 -9.36 0.0003
2025-11-14 2025-09-30 13F BANK MARIN BANCORP COM 063425102 232,802 -40,245 5,652 0.0003
2025-08-15 2025-06-30 13F BANK MARIN BANCORP COM 063425102 273,047 3,448 1.28 6,236 4.81 0.0004
2025-05-15 2025-03-31 13F BANK MARIN BANCORP COM 063425102 269,599 -9,470 -3.39 5,950 -10.30 0.0004
2025-05-15 2024-12-31 13F/A-1 BANK MARIN BANCORP COM 063425102 279,069 6,175 2.26 6,633 21.00 0.0005
2025-02-14 2024-12-31 13F BANK MARIN BANCORP COM 063425102 279,069 6,175 6,633 0.0005
2025-05-14 2024-09-30 13F/A-2 BANK MARIN BANCORP COM 063425102 272,894 5,599 2.09 5,482 26.69 0.0004
2025-02-14 2024-09-30 13F/A-1 BANK MARIN BANCORP COM 063425102 272,894 5,599 5,482 0.0004
2024-11-14 2024-09-30 13F BANK MARIN BANCORP COM 063425102 272,894 5,599 5,482 0.0000
2025-05-14 2024-06-30 13F/A-2 BANK MARIN BANCORP COM 063425102 267,295 77,090 40.53 4,328 35.69 0.0003
2024-10-17 2024-06-30 13F/A-1 BANK MARIN BANCORP COM 063425102 267,295 77,090 4,328 0.0003
2024-08-14 2024-06-30 13F BANK MARIN BANCORP COM 063425102 267,295 77,090 4,328 0.0003
2024-10-17 2024-03-31 13F/A-2 BANK MARIN BANCORP COM 063425102 190,205 -12,312 -6.08 3,190 -28.48 0.0003
2024-08-16 2024-03-31 13F/A-1 BANK MARIN BANCORP COM 063425102 190,205 -12,312 3,190 0.0000
2024-05-15 2024-03-31 13F BANK MARIN BANCORP COM 063425102 190,205 -12,312 3,190 0.0003
2024-08-16 2023-12-31 13F/A-1 BANK MARIN BANCORP COM 063425102 202,517 10,850 5.66 4,459 27.29 0.0004
2024-02-13 2023-12-31 13F BANK MARIN BANCORP COM 063425102 202,517 10,850 4,459 0.0004
2023-11-15 2023-09-30 13F BANK MARIN BANCORP COM 063425102 191,667 -11,215 -5.53 3,504 -2.26 0.0004
2023-08-14 2023-06-30 13F BANK MARIN BANCORP COM 063425102 202,882 93,013 84.66 3,585 49.02 0.0004
2023-05-15 2023-03-31 13F BANK MARIN BANCORP COM 063425102 109,869 17,559 19.02 2,405 -20.76 0.0003
2023-02-14 2022-12-31 13F BANK MARIN BANCORP COM 063425102 92,310 -1,636 -1.74 3,035 7.89 0.0003
2022-11-14 2022-09-30 13F BANK MARIN BANCORP COM 063425102 93,946 1,471 1.59 2,813 -4.32 0.0004
2022-10-27 2022-06-30 13F/A-1 BANK MARIN BANCORP COM 063425102 92,475 15,521 20.17 2,940 8.93 0.0004
2022-08-15 2022-06-30 13F BANK MARIN BANCORP COM 063425102 92,475 15,521 2,940 0.0001
2022-10-27 2022-03-31 13F/A-1 BANK MARIN BANCORP COM 063425102 76,954 -8,979 -10.45 2,699 -15.60 0.0004
2022-05-13 2022-03-31 13F BANK MARIN BANCORP COM 063425102 76,954 -8,979 2,699 0.0004
2022-02-14 2021-12-31 13F BANK MARIN BANCORP COM 063425102 85,933 5,110 6.32 3,198 4.82 0.0004
2021-11-15 2021-09-30 13F BANK MARIN BANCORP COM 063425102 80,823 15,224 23.21 3,051 45.70 0.0004
2021-08-23 2021-06-30 13F/A-1 BANK MARIN BANCORP COM 063425102 65,599 7,217 12.36 2,094 -8.44 0.0003
2021-08-16 2021-06-30 13F BANK MARIN BANCORP COM 063425102 65,599 7,217 2,094 0.0001
2021-05-17 2021-03-31 13F BANK MARIN BANCORP COM 063425102 58,382 -15,811 -21.31 2,287 -10.24 0.0003
2021-02-16 2020-12-31 13F BANK MARIN BANCORP COM 063425102 74,193 26,693 56.20 2,548 85.17 0.0004
2020-11-13 2020-09-30 13F BANK MARIN BANCORP COM 063425102 47,500 -495 -1.03 1,376 -14.00 0.0003
2020-08-14 2020-06-30 13F BANK OF MARIN BANCORP COM 063425102 47,995 2,725 6.02 1,600 17.82 0.0004
2020-05-26 2020-03-31 13F/A-1 BANK OF MARIN BANCORP COM 063425102 45,270 -16,650 -26.89 1,358 -51.33 0.0004
2020-05-15 2020-03-31 13F BANK OF MARIN BANCORP COM 063425102 45,270 -16,650 1,358 104.3227
2020-02-14 2019-12-31 13F BANK OF MARIN BANCORP COM 063425102 61,920 13,614 28.18 2,790 39.22 0.0006
2019-11-14 2019-09-30 13F BANK OF MARIN BANCORP COM 063425102 48,306 -36,855 -43.28 2,004 -42.63 0.0005
2019-08-14 2019-06-30 13F BANK OF MARIN BANCORP COM 063425102 85,161 38,909 84.12 3,493 85.70 0.0009
2019-05-15 2019-03-31 13F BANK OF MARIN BANCORP COM 063425102 46,252 -33,591 -42.07 1,881 -42.88 0.0005
2019-02-14 2018-12-31 13F BANK OF MARIN BANCORP COM 063425102 79,843 46,203 137.35 3,293 16.69 0.0010
2019-04-23 2018-09-30 13F/A-2 BANK OF MARIN BANCORP COM 063425102 33,640 -3,406 -9.19 2,822 -5.78 0.0007
2018-11-20 2018-09-30 13F/A-1 BANK OF MARIN BANCORP COM 063425102 33,640 0 2,822 0.0007
2018-11-14 2018-09-30 13F BANK OF MARIN BANCORP COM 063425102 33,640 -3,406 2,822
2019-04-23 2018-06-30 13F/A-1 BANK OF MARIN BANCORP COM 063425102 37,046 -5,788 -13.51 2,995 1.39 0.0008
2018-08-14 2018-06-30 13F BANK OF MARIN BANCORP COM 063425102 37,046 -5,788 2,995
2019-04-23 2018-03-31 13F/A-1 BANK OF MARIN BANCORP COM 063425102 42,834 2,962 7.43 2,954 8.96 0.0008
2018-05-14 2018-03-31 13F BANK OF MARIN BANCORP COM 063425102 42,834 2,962 2,954
2019-04-23 2017-12-31 13F/A-1 BANK OF MARIN BANCORP COM 063425102 39,872 10,009 33.52 2,711 32.57 0.0007
2018-02-14 2017-12-31 13F BANK OF MARIN BANCORP COM 063425102 39,872 10,009 2,711
2017-11-14 2017-09-30 13F BANK OF MARIN BANCORP COM 063425102 29,863 3,954 15.26 2,045 28.21 0.0006
2017-08-11 2017-06-30 13F BANK OF MARIN BANCORP COM 063425102 25,909 -1,719 -6.22 1,595 -10.24 0.0005
2017-05-22 2017-03-31 13F/A-1 BANK OF MARIN BANCORP COM 063425102 27,628 -7,732 -21.87 1,777 -27.94 0.0005
2017-05-12 2017-03-31 13F BANK OF MARIN BANCORP COM 063425102 27,628 1,777
2017-02-22 2016-12-31 13F/A-1 BANK OF MARIN BANCORP COM 063425102 35,360 15,635 79.26 2,466 151.38 0.0008
2017-02-13 2016-12-31 13F BANK OF MARIN BANCORP COM 063425102 35,360 2,466
2016-11-10 2016-09-30 13F BANK OF MARIN BANCORP COM 063425102 19,725 2,442 14.13 981 17.34 0.0003
2016-08-12 2016-06-30 13F BANK OF MARIN BANCORP COM 063425102 17,283 239 1.40 836 -0.36 0.0003
2016-05-12 2016-03-31 13F BANK OF MARIN BANCORP COM 063425102 17,044 -125 -0.73 839 -8.51 0.0003
2016-02-09 2015-12-31 13F BANK OF MARIN BANCORP COM 063425102 17,169 -2,983 -14.80 917 -5.07 0.0003
2016-02-08 2015-09-30 13F/A-1 BANK OF MARIN BANCORP COM 063425102 20,152 -1,905 -8.64 966 -13.90 0.0004
2015-11-09 2015-09-30 13F BANK OF MARIN BANCORP COM 063425102 20,152 966
2015-08-12 2015-06-30 13F BANK OF MARIN BANCORP COM 063425102 22,057 -1,456 -6.19 1,122 -6.19 0.0004
2015-05-14 2015-03-31 13F BANK OF MARIN BANCORP COM 063425102 23,513 -7,606 -24.44 1,196 -26.94 0.0004
2015-02-13 2014-12-31 13F BANK OF MARIN BANCORP COM 063425102 31,119 3,970 14.62 1,637 31.38 0.0006
2014-12-16 2014-09-30 13F/A-1 BANK OF MARIN BANCORP COM 063425102 27,149 -675 -2.43 1,246 -1.74 0.0005
2014-11-14 2014-09-30 13F BANK OF MARIN BANCORP COM 063425102 27,149 1,246
2014-08-12 2014-06-30 13F BANK OF MARIN BANCORP COM 063425102 27,824 -8,123 -22.60 1,268 -21.73 0.0022
2014-05-13 2014-03-31 13F BANK OF MARIN BANCORP COM 063425102 35,947 8,658 31.73 1,620 36.71 0.0007
2014-02-13 2013-12-31 13F BANK OF MARIN BANCORP COM 063425102 27,289 5,328 24.26 1,185 29.79 0.0005
2013-11-13 2013-09-30 13F BK OF MARIN BNCP COM 063425102 21,961 -1,067 -4.63 913 -0.87 0.0004
2013-08-08 2013-06-30 13F BK OF MARIN BNCP COM 063425102 23,028 23,028 921 0.0005
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.