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
2025 Q1	–	Sell	-104,400	Closed	-$95.7M	–	5443
2024 Q4	$95.7M	Sell	104,400 -37,900	-27%	-$35.2M	﹤0.01%	2108
2024 Q3	$126M	Buy	+142,300	New	+$124M	﹤0.01%	1949
2024 Q2	–	Sell	-163,000	Closed	-$119M	–	5294
2024 Q1	$119M	Buy	163,000 +22,500	+16%	+$16.1M	﹤0.01%	1959
2023 Q4	$92.7M	Buy	+140,500	New	+$83.3M	﹤0.01%	2132
2023 Q2	–	Sell	-39,000	Closed	-$19.4M	–	5518
2023 Q1	$19.4M	Buy	+39,000	New	+$19.1M	﹤0.01%	2992
2020 Q4	–	Sell	-92,700	Closed	-$32.9M	–	5063
2020 Q3	$32.9M	Sell	92,700 -200	-0.2%	-$67.2K	﹤0.01%	2548
2020 Q2	$28.2M	Sell	92,900 -2,800	-3%	-$852K	﹤0.01%	2622
2020 Q1	$27.3M	Buy	+95,700	New	+$29M	﹤0.01%	2437

Other funds holding COST

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return

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 Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

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.