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Sienna Gestion’s Costco COST Stock Holding History

Sienna Gestion’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
2025
Q3 		– Sell
-18,961
Closed -$17.1M – 167
2025
Q2 		$17.1M Buy
18,961
+1,807
+11% +$1.8M 1.18% 18
2025
Q1 		$15.8M Sell
17,154
-1,995
-10% -$1.95M 1.28% 12
2024
Q4 		$17.5M Hold
19,149
– – 1.18% 14
2024
Q3 		$16.9M Buy
19,149
+3,497
+22% +$3.04M 1.13% 15
2024
Q2 		$13.3M Buy
15,652
+645
+4% +$503K 1.18% 13
2024
Q1 		$11M Buy
+15,007
New +$10.7M 0.94% 27

Other funds holding COST

Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
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
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Bank of America
Bank of America Charlotte, North Carolina $1.37T AUM 24.88% 1-Year Est. Return
Northern Trust
Northern Trust Chicago, Illinois $757B AUM 28.64% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
Royal Bank of Canada
Royal Bank of Canada Toronto, Ontario, Canada $570B AUM 27.57% 1-Year Est. Return

Sienna Gestion's COST Position: Q3 2025 in Review

Sienna Gestion sold out of Costco (COST) in Q3 2025, closing a stake of 18,961 shares — an estimated $17.1M sold.

Sienna Gestion first reported a position in COST in Q1 2024 and held it in 6 quarters. The position peaked at $17.5M in Q4 2024. 3,932 funds tracked by Wall St. Rank hold COST as of Q3 2025.

  • Sienna Gestion reported no remaining Costco position as of Q3 2025 after selling out during the quarter.
  • Sienna Gestion sold 18,961 Costco shares in Q3 2025, an estimated $17.1M.
  • Sienna Gestion first reported a position in Costco in Q1 2024 and held it in 6 quarters.
  • Sienna Gestion's Costco position peaked at $17.5M in Q4 2024.
  • 3,932 funds tracked by Wall St. Rank held Costco as of Q3 2025.

Based on Sienna Gestion's 13F filing for Q3 2025, filed 13 Nov 2025.