Calamos Advisors
COST icon

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
2026
Q1 		$1.38M Sell
1,600
-500
-24% -$487K ﹤0.01% 726
2025
Q4 		$1.94M Buy
2,100
+100
+5% +$90.6K 0.01% 622
2025
Q3 		$1.98M Buy
2,000
+1,000
+100% +$959K 0.01% 628
2025
Q2 		$946K Buy
1,000
+500
+100% +$497K ﹤0.01% 698
2025
Q1 		$458K Buy
+500
New +$487K ﹤0.01% 726

Other funds holding COST

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

Calamos Advisors's COST Position: Q1 2026 in Review

Calamos Advisors increased its Costco (COST) stake by 3.3% in Q1 2026, buying an estimated $2.84M and bringing the position to 91,006 shares worth $90.7M. The position accounts for 0.32% of the portfolio, ranked #60.

Calamos Advisors first reported a position in COST in Q2 2013 and has held it in 52 quarters since. The position peaked at $109M in Q3 2014. 4,237 funds tracked by Wall St. Rank hold COST as of Q1 2026.

  • Calamos Advisors held 91,006 shares of Costco worth $90.7M as of Q1 2026.
  • Calamos Advisors bought 2,913 Costco shares in Q1 2026, an estimated $2.84M.
  • Costco made up 0.32% of Calamos Advisors's portfolio in Q1 2026, its #60 holding.
  • Calamos Advisors first reported a position in Costco in Q2 2013 and has held it in 52 quarters since.
  • Calamos Advisors's Costco position peaked at $109M in Q3 2014.
  • 4,237 funds tracked by Wall St. Rank held Costco as of Q1 2026.

Based on Calamos Advisors's 13F filing for Q1 2026, filed 4 May 2026.