Bank of Marin Bancorp
US ˙ NasdaqGS ˙ US0634251021

SecurityBMRC / Bank of Marin Bancorp
InstitutionAlliancebernstein L.p.
Latest Disclosed Ownership623,046 shares
Latest Disclosed Value $ 16,205,426
Alliancebernstein L.p. reports 5.59% decrease in ownership of BMRC / Bank of Marin Bancorp

On May 15, 2026 - Alliancebernstein L.p. filed a 13F-HR form disclosing ownership of 623,046 shares of Bank of Marin Bancorp (US:BMRC) valued at $15,968,669 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 659,962 shares of Bank of Marin Bancorp. This represents a change in shares of -5.59% during the quarter. The current value of the position is $15,629,109 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 623,046 -36,916 -5.59 16,205 -5.59 0.0044
2026-02-17 2025-12-31 13F BANK MARIN BANCORP COM 063425102 659,962 -13,556 -2.01 17,166 4.97 0.0054
2025-11-14 2025-09-30 13F BANK MARIN BANCORP COM 063425102 673,518 -17,941 -2.59 16,353 3.55 0.0051
2025-08-14 2025-06-30 13F BANK MARIN BANCORP COM 063425102 691,459 -10,075 -1.44 15,793 2.00 0.0052
2025-05-15 2025-03-31 13F BANK MARIN BANCORP COM 063425102 701,534 46,020 7.02 15,483 -0.64 0.0056
2025-02-12 2024-12-31 13F BANK MARIN BANCORP COM 063425102 655,514 38,934 6.31 15,582 25.79 0.0053
2024-11-14 2024-09-30 13F BANK MARIN BANCORP COM 063425102 616,580 -36,466 -5.58 12,387 17.17 0.0042
2024-08-14 2024-06-30 13F BANK MARIN BANCORP COM 063425102 653,046 -80,424 -10.96 10,573 -14.05 0.0037
2024-05-14 2024-03-31 13F BANK MARIN BANCORP COM 063425102 733,470 -42,102 -5.43 12,300 -27.98 0.0044
2024-02-14 2023-12-31 13F BANK MARIN BANCORP COM 063425102 775,572 -11,284 -1.43 17,078 18.74 0.0066
2023-11-14 2023-09-30 13F BANK MARIN BANCORP COM 063425102 786,856 -6,010 -0.76 14,384 2.67 0.0061
2023-08-15 2023-06-30 13F BANK MARIN BANCORP COM 063425102 792,866 118,908 17.64 14,010 -5.04 0.0057
2023-05-15 2023-03-31 13F BANK MARIN BANCORP COM 063425102 673,958 68,135 11.25 14,753 -25.94 0.0063
2023-02-15 2022-12-31 13F BANK MARIN BANCORP COM 063425102 605,823 1,447 0.24 19,919 10.04 0.0090
2022-11-15 2022-09-30 13F BANK MARIN BANCORP COM 063425102 604,376 -7,210 -1.18 18,101 -6.87 0.0088
2022-08-15 2022-06-30 13F BANK MARIN BANCORP COM 063425102 611,586 -31,712 -4.93 19,436 -13.85 0.0089
2022-05-13 2022-03-31 13F BANK MARIN BANCORP COM 063425102 643,298 -63,504 -8.98 22,560 -14.27 0.0087
2022-02-14 2021-12-31 13F BANK MARIN BANCORP COM 063425102 706,802 -67,496 -8.72 26,314 -9.98 0.0093
2021-11-10 2021-09-30 13F BANK MARIN BANCORP COM 063425102 774,298 224,841 40.92 29,230 66.76 0.0115
2021-07-30 2021-06-30 13F BANK MARIN BANCORP COM 063425102 549,457 -27,684 -4.80 17,528 -22.45 0.0070
2021-05-06 2021-03-31 13F BANK MARIN BANCORP COM 063425102 577,141 32,470 5.96 22,601 20.84 0.0099
2021-02-08 2020-12-31 13F BANK MARIN BANCORP COM 063425102 544,671 27,697 5.36 18,704 24.93 0.0088
2020-11-12 2020-09-30 13F BANK MARIN BANCORP COM 063425102 516,974 54,481 11.78 14,972 -2.87 0.0081
2020-08-13 2020-06-30 13F BANK OF MARIN BANCORP COM 063425102 462,493 82,179 21.61 15,415 35.11 0.0091
2020-05-14 2020-03-31 13F BANK OF MARIN BANCORP COM 063425102 380,314 -23,827 -5.90 11,409 -37.34 0.0082
2020-02-18 2019-12-31 13F BANK OF MARIN BANCORP COM 063425102 404,141 24,392 6.42 18,207 15.56 0.0103
2019-11-14 2019-09-30 13F BANK OF MARIN BANCORP COM 063425102 379,749 174,682 85.18 15,756 87.30 0.0098
2019-08-14 2019-06-30 13F BANK OF MARIN BANCORP COM 063425102 205,067 192,187 1,492.14 8,412 1,505.34 0.0052
2019-05-14 2019-03-31 13F BANK OF MARIN BANCORP COM 063425102 12,880 700 5.75 524 4.38 0.0003
2019-02-13 2018-12-31 13F BANK OF MARIN BANCORP COM 063425102 12,180 6,290 106.79 502 1.62 0.0004
2018-11-08 2018-09-30 13F BANK OF MARIN BANCORP COM 063425102 5,890 0 0.00 494 3.78 0.0003
2018-08-13 2018-06-30 13F BANK OF MARIN BANCORP COM 063425102 5,890 200 3.51 476 21.43 0.0003
2018-05-14 2018-03-31 13F BANK OF MARIN BANCORP COM 063425102 5,690 100 1.79 392 3.16 0.0003
2018-02-13 2017-12-31 13F BANK OF MARIN BANCORP COM 063425102 5,590 -400 -6.68 380 -7.32 0.0003
2017-11-13 2017-09-30 13F BANK OF MARIN BANCORP COM 063425102 5,990 -600 -9.10 410 0.99 0.0003
2017-08-10 2017-06-30 13F BANK OF MARIN BANCORP COM 063425102 6,590 1,500 29.47 406 23.78 0.0003
2017-05-11 2017-03-31 13F BANK OF MARIN BANCORP COM 063425102 5,090 -400 -7.29 328 -14.36 0.0003
2017-02-13 2016-12-31 13F BANK OF MARIN BANCORP COM 063425102 5,490 200 3.78 383 45.63 0.0003
2016-11-10 2016-09-30 13F BANK OF MARIN BANCORP COM 063425102 5,290 300 6.01 263 9.13 0.0002
2016-08-11 2016-06-30 13F BANK OF MARIN BANCORP COM 063425102 4,990 800 19.09 241 16.99 0.0002
2016-05-13 2016-03-31 13F BANK OF MARIN BANCORP COM 063425102 4,190 -400 -8.71 206 -15.92 0.0002
2016-02-16 2015-12-31 13F/A-1 BANK OF MARIN BANCORP COM 063425102 4,590 -200 -4.18 245 6.52 0.0002
2016-02-12 2015-12-31 13F BANK OF MARIN BANCORP COM 063425102 4,590 220
2015-11-13 2015-09-30 13F BANK OF MARIN BANCORP COM 063425102 4,790 -400 -7.71 230 -12.88 0.0002
2015-08-14 2015-06-30 13F BANK OF MARIN BANCORP COM 063425102 5,190 -200 -3.71 264 -3.65 0.0002
2015-05-13 2015-03-31 13F BANK OF MARIN BANCORP COM 063425102 5,390 100 1.89 274 -1.44 0.0002
2015-02-13 2014-12-31 13F BANK OF MARIN BANCORP COM 063425102 5,290 -500 -8.64 278 4.51 0.0002
2014-11-13 2014-09-30 13F BANK OF MARIN BANCORP COM 063425102 5,790 -600 -9.39 266 -8.59 0.0002
2014-08-13 2014-06-30 13F BANK OF MARIN BANCORP COM 063425102 6,390 -1,450 -18.49 291 -17.56 0.0002
2014-05-13 2014-03-31 13F BANK OF MARIN BANCORP COM 063425102 7,840 -1,400 -15.15 353 -11.97 0.0003
2014-02-13 2013-12-31 13F BANK OF MARIN BANCORP COM 063425102 9,240 -2,100 -18.52 401 -14.86 0.0004
2013-11-14 2013-09-30 13F BANK OF MARIN BANCORP COM 063425102 11,340 -550 -4.63 471 -1.05 0.0005
2013-08-13 2013-06-30 13F BANK OF MARIN BANCORP COM 063425102 11,890 11,890 476 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.