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Rossby Financial’s Costco COST Stock Holding History

Rossby Financial’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
Q2 		$868K Buy
928
+359
+63% +$358K 0.16% 124
2026
Q1 		$567K Buy
569
+194
+52% +$189K 0.12% 166
2025
Q4 		$323K Sell
375
-299
-44% -$271K 0.1% 176
2025
Q3 		$618K Buy
674
+35
+5% +$33.5K 0.2% 92
2025
Q2 		$633K Sell
639
-11
-2% -$10.9K 0.23% 79
2025
Q1 		$635K Buy
650
+40
+7% +$39K 0.27% 74
2024
Q4 		$559K Buy
+610
New +$566K 0.35% 71

Other funds holding COST

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return
Bank of America
Bank of America Charlotte, North Carolina $1.55T AUM 33.47% 1-Year Est. Return
Norges Bank
Norges Bank Oslo, Norway $1T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

Rossby Financial's COST Position: Q2 2026 in Review

Rossby Financial increased its Costco (COST) stake by 63% in Q2 2026, buying an estimated $358K and bringing the position to 928 shares worth $868K. The position accounts for 0.16% of the portfolio, ranked #124.

Rossby Financial first reported a position in COST in Q4 2024 and has held it in 7 quarters since. 4,229 funds tracked by Wall St. Rank hold COST as of Q2 2026.

  • Rossby Financial held 928 shares of Costco worth $868K as of Q2 2026.
  • Rossby Financial bought 359 Costco shares in Q2 2026, an estimated $358K.
  • Costco made up 0.16% of Rossby Financial's portfolio in Q2 2026, its #124 holding.
  • Rossby Financial first reported a position in Costco in Q4 2024 and has held it in 7 quarters since.
  • 4,229 funds tracked by Wall St. Rank held Costco as of Q2 2026.

Based on Rossby Financial's 13F filing for Q2 2026, filed 4 Aug 2026.