Calamos Advisors’s Costco COST Stock Holding History

Calamos Advisors’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
2023 Q1	–	Sell	-800	Closed	-$365K	–	1150
2022 Q4	$365K	Buy	+800	New	+$391K	﹤0.01%	920

Other funds holding COST

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

State Street Boston, Massachusetts $3.38T AUM 44.17% 1-Year Est. Return

Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return

Bank of America Charlotte, North Carolina $1.55T AUM 33.47% 1-Year Est. Return

Norges Bank Oslo, Norway $1T AUM

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

Calamos Advisors's COST Position: Q2 2026 in Review

Calamos Advisors reduced its Costco (COST) stake by 12% in Q2 2026, selling an estimated $10.6M and leaving 80,404 shares worth $75.2M. The position accounts for 0.25% of the portfolio, ranked #83.

Calamos Advisors first reported a position in COST in Q2 2013 and has held it in 53 quarters since. The position peaked at $109M in Q3 2014. 4,260 funds tracked by Wall St. Rank hold COST as of Q2 2026.

Calamos Advisors held 80,404 shares of Costco worth $75.2M as of Q2 2026.
Calamos Advisors sold 10,602 Costco shares in Q2 2026, an estimated $10.6M.
Costco made up 0.25% of Calamos Advisors's portfolio in Q2 2026, its #83 holding.
Calamos Advisors first reported a position in Costco in Q2 2013 and has held it in 53 quarters since.
Calamos Advisors's Costco position peaked at $109M in Q3 2014.
4,260 funds tracked by Wall St. Rank held Costco as of Q2 2026.

Based on Calamos Advisors's 13F filing for Q2 2026, filed 31 Jul 2026.