BlackRock
COST icon

BlackRock’s Costco COST Stock Holding History

BlackRock’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
2024
Q3 		– Sell
-21,000
Closed -$17.8M – 5239
2024
Q2 		$17.8M Buy
+21,000
New +$16.4M ﹤0.01% 3056
2017
Q4 		– Sell
-300,000
Closed -$49.3M – 4933
2017
Q3 		$49.3M Buy
+300,000
New +$47.1M ﹤0.01% 2300

Other funds holding COST

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 $137B AUM 18.02% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Northern Trust
Northern Trust Chicago, Illinois $757B AUM 28.64% 1-Year Est. Return

BlackRock's COST Position: Q1 2026 in Review

BlackRock reduced its Costco (COST) stake by 0.43% in Q1 2026, selling an estimated $149M and leaving 34,947,040 shares worth $34.8B. The position accounts for 0.61% of the portfolio, ranked #19.

BlackRock first reported a position in COST in Q2 2013 and has held it in 52 quarters since. The position peaked at $35.2B in Q2 2025. 4,238 funds tracked by Wall St. Rank hold COST as of Q1 2026.

  • BlackRock held 34,947,040 shares of Costco worth $34.8B as of Q1 2026.
  • BlackRock sold 152,481 Costco shares in Q1 2026, an estimated $149M.
  • Costco made up 0.61% of BlackRock's portfolio in Q1 2026, its #19 holding.
  • BlackRock first reported a position in Costco in Q2 2013 and has held it in 52 quarters since.
  • BlackRock's Costco position peaked at $35.2B in Q2 2025.
  • 4,238 funds tracked by Wall St. Rank held Costco as of Q1 2026.

Based on BlackRock's 13F filing for Q1 2026, filed 13 May 2026.