Boston Partners’s Costco COST Stock Holding History

Boston Partners’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 Q1	$369K	Buy	370 +60	+19%	+$58.5K	﹤0.01%	710
2025 Q4	$267K	Buy	310 +5	+2%	+$4.53K	﹤0.01%	732
2025 Q3	$282K	Buy	+305	New	+$292K	﹤0.01%	720

Other funds holding COST

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

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

Boston Partners's COST Position: Q1 2026 in Review

Boston Partners increased its Costco (COST) stake by 19% in Q1 2026, buying an estimated $58.5K and bringing the position to 370 shares worth $369K. The position accounts for ﹤0.01% of the portfolio, ranked #710.

Boston Partners first reported a position in COST in Q3 2025 and has held it in 3 quarters since. 4,239 funds tracked by Wall St. Rank hold COST as of Q1 2026.

Boston Partners held 370 shares of Costco worth $369K as of Q1 2026.
Boston Partners bought 60 Costco shares in Q1 2026, an estimated $58.5K.
Costco made up ﹤0.01% of Boston Partners's portfolio in Q1 2026, its #710 holding.
Boston Partners first reported a position in Costco in Q3 2025 and has held it in 3 quarters since.
4,239 funds tracked by Wall St. Rank held Costco as of Q1 2026.

Based on Boston Partners's 13F filing for Q1 2026, filed 11 May 2026.