Sienna Gestion
COST icon

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
2026
Q3 		$11.9M Hold
12,872
– – 0.66% 45
2026
Q2 		$12.3M Buy
+12,872
New +$12.8M 0.72% 40
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

BlackRock
BlackRock New York $6.79T AUM 37.06% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.76T AUM
State Street
State Street Boston, Massachusetts $3.44T AUM 36.12% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.27T AUM 50.62% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.92T AUM 36.1% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.21T AUM
Morgan Stanley
Morgan Stanley New York $1.96T AUM 27.49% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.32T AUM 44.66% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.84T AUM 33.86% 1-Year Est. Return
Fisher Asset Management
Fisher Asset Management Camas, Washington $348B AUM 26.9% 1-Year Est. Return

Sienna Gestion's COST Position: Q3 2026 in Review

Sienna Gestion held its Costco (COST) position steady in Q3 2026 at 12,872 shares worth $11.9M. The position accounts for 0.66% of the portfolio, ranked #45.

Sienna Gestion first reported a position in COST in Q1 2024 and has held it in 8 quarters since. The position peaked at $17.5M in Q4 2024. 3,744 funds tracked by Wall St. Rank hold COST as of Q3 2026.

  • Sienna Gestion held 12,872 shares of Costco worth $11.9M as of Q3 2026.
  • Sienna Gestion left its Costco share count unchanged in Q3 2026.
  • Costco made up 0.66% of Sienna Gestion's portfolio in Q3 2026, its #45 holding.
  • Sienna Gestion first reported a position in Costco in Q1 2024 and has held it in 8 quarters since.
  • Sienna Gestion's Costco position peaked at $17.5M in Q4 2024.
  • 3,744 funds tracked by Wall St. Rank held Costco as of Q3 2026.

Based on Sienna Gestion's 13F filing for Q3 2026, filed 12 Nov 2026.