HI
CPST

Harbour Investments’s Calamos S&P 500 Structured Alt Protection ETF - September CPST Stock Holding History

Harbour Investments’s Portfolio CPST Stock Details CPST Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$312K Sell
11,556
-3,939
-25% -$107K ﹤0.01% 1288
2025
Q4 		$419K Hold
15,495
– – 0.01% 932
2025
Q3 		$414K Buy
+15,495
New +$410K 0.01% 897

Other funds holding CPST

Calamos Advisors
Calamos Advisors Naperville, Illinois $28.2B AUM 21.78% 1-Year Est. Return
Osaic Holdings
Osaic Holdings Scottsdale, Arizona $68.3B AUM 20.5% 1-Year Est. Return
CWM
Calamos Wealth Management Naperville, Illinois $2.91B AUM 25.59% 1-Year Est. Return
OMC
Old Mission Capital Chicago, Illinois $6.3B AUM 14.68% 1-Year Est. Return
CP
Camelot Portfolios Maumee, Ohio $143M AUM 14.82% 1-Year Est. Return
Commonwealth Equity Services
Commonwealth Equity Services Waltham, Massachusetts $71.6B AUM 21.08% 1-Year Est. Return
Susquehanna International Group
Susquehanna International Group Bala Cynwyd, Pennsylvania $893B AUM 36.07% 1-Year Est. Return
BWAM
Blue Water Asset Management Grand Rapids, Michigan $289M AUM
LWP
LeClair Wealth Partners Dublin, Ohio $289M AUM 19.98% 1-Year Est. Return
CAL
Capital Analysts LLC Fort Washington, Pennsylvania $3.81B AUM 15.52% 1-Year Est. Return

Harbour Investments's CPST Position: Q1 2026 in Review

Harbour Investments reduced its Calamos S&P 500 Structured Alt Protection ETF - September (CPST) stake by 25% in Q1 2026, selling an estimated $107K and leaving 11,556 shares worth $312K. The position accounts for ﹤0.01% of the portfolio, ranked #1288.

Harbour Investments first reported a position in CPST in Q3 2025 and has held it in 3 quarters since. The position peaked at $419K in Q4 2025. 19 funds tracked by Wall St. Rank hold CPST as of Q1 2026.

  • Harbour Investments held 11,556 shares of Calamos S&P 500 Structured Alt Protection ETF - September worth $312K as of Q1 2026.
  • Harbour Investments sold 3,939 Calamos S&P 500 Structured Alt Protection ETF - September shares in Q1 2026, an estimated $107K.
  • Calamos S&P 500 Structured Alt Protection ETF - September made up ﹤0.01% of Harbour Investments's portfolio in Q1 2026, its #1288 holding.
  • Harbour Investments first reported a position in Calamos S&P 500 Structured Alt Protection ETF - September in Q3 2025 and has held it in 3 quarters since.
  • Harbour Investments's Calamos S&P 500 Structured Alt Protection ETF - September position peaked at $419K in Q4 2025.
  • 19 funds tracked by Wall St. Rank held Calamos S&P 500 Structured Alt Protection ETF - September as of Q1 2026.

Based on Harbour Investments's 13F filing for Q1 2026, filed 15 May 2026.