BOM
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Bank of Marin’s Costco COST Stock Holding History

Bank of Marin’s Portfolio COST Stock Details COST Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$2.84M Hold
2,850
– – 2.07% 11
2025
Q4 		$2.46M Hold
2,850
– – 1.7% 14
2025
Q3 		$2.64M Buy
2,850
+13
+0.5% +$12.5K 1.86% 13
2025
Q2 		$2.81M Buy
2,837
+24
+0.9% +$23.9K 2.12% 9
2025
Q1 		$2.66M Sell
2,813
-190
-6% -$185K 3.39% 6
2024
Q4 		$2.75M Buy
3,003
+164
+6% +$152K 2.18% 10
2024
Q3 		$2.52M Sell
2,839
-11
-0.4% -$9.55K 2.03% 10
2024
Q2 		$2.42M Sell
2,850
-75
-3% -$58.5K 2.08% 10
2024
Q1 		$2.14M Sell
2,925
-62
-2% -$44.3K 1.88% 9
2023
Q4 		$1.97M Sell
2,987
-6
-0.2% -$3.56K 1.77% 11
2023
Q3 		$1.69M Sell
2,993
-35
-1% -$19.3K 1.65% 14
2023
Q2 		$1.63M Sell
3,028
-533
-15% -$270K 1.52% 14
2023
Q1 		$1.77M Buy
3,561
+35
+1% +$17.2K 1.69% 11
2022
Q4 		$1.61M Buy
3,526
+98
+3% +$47.9K 1.51% 15
2022
Q3 		$1.62M Sell
3,428
-168
-5% -$87.4K 1.59% 15
2022
Q2 		$1.72M Sell
3,596
-45
-1% -$22.8K 1.52% 16
2022
Q1 		$2.1M Sell
3,641
-10
-0.3% -$5.25K 1.53% 14
2021
Q4 		$2.07M Buy
3,651
+38
+1% +$19.5K 1.38% 16
2021
Q3 		$1.62M Sell
3,613
-8
-0.2% -$3.52K 1.19% 21
2021
Q2 		$1.43M Sell
3,621
-75
-2% -$28.4K 1.05% 25
2021
Q1 		$1.3M Buy
3,696
+264
+8% +$91.9K 1.03% 26
2020
Q4 		$1.29M Buy
3,432
+214
+7% +$80K 1.09% 29
2020
Q3 		$1.14M Sell
3,218
-20
-0.6% -$6.72K 1.17% 25
2020
Q2 		$982K Buy
3,238
+143
+5% +$43.5K 1.12% 27
2020
Q1 		$882K Sell
3,095
-666
-18% -$202K 1.2% 27
2019
Q4 		$1.1M Buy
+3,761
New +$1.12M 1.12% 27

Other funds holding COST

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
Bank of America
Bank of America Charlotte, North Carolina $1.37T AUM 24.88% 1-Year Est. Return
DAM
Diamant Asset Management Ridgefield, Connecticut $147M AUM 25.76% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

Bank of Marin's COST Position: Q1 2026 in Review

Bank of Marin held its Costco (COST) position steady in Q1 2026 at 2,850 shares worth $2.84M. The position accounts for 2.07% of the portfolio, ranked #11.

Bank of Marin first reported a position in COST in Q4 2019 and has held it in 26 quarters since. 4,239 funds tracked by Wall St. Rank hold COST as of Q1 2026.

  • Bank of Marin held 2,850 shares of Costco worth $2.84M as of Q1 2026.
  • Bank of Marin left its Costco share count unchanged in Q1 2026.
  • Costco made up 2.07% of Bank of Marin's portfolio in Q1 2026, its #11 holding.
  • Bank of Marin first reported a position in Costco in Q4 2019 and has held it in 26 quarters since.
  • 4,239 funds tracked by Wall St. Rank held Costco as of Q1 2026.

Based on Bank of Marin's 13F filing for Q1 2026, filed 14 May 2026.