Jane Street
CPST

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

Jane Street’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
2025
Q4 		– Sell
-12,870
Closed -$344K – 12695
2025
Q3 		$344K Buy
+12,870
New +$340K ﹤0.01% 8648
2025
Q1 		– Sell
-19,892
Closed -$504K – 10939
2024
Q4 		$504K Sell
19,892
-5,435
-21% -$137K ﹤0.01% 6772
2024
Q3 		$635K Buy
+25,327
New +$631K ﹤0.01% 6766

Other funds holding CPST

Calamos Advisors
Calamos Advisors Naperville, Illinois $30.1B AUM 30.03% 1-Year Est. Return
CWM
Calamos Wealth Management Naperville, Illinois $3.31B AUM 32.95% 1-Year Est. Return
Osaic Holdings
Osaic Holdings Scottsdale, Arizona $85.1B AUM 27.35% 1-Year Est. Return
OMC
Old Mission Capital Chicago, Illinois $6.31B AUM 20.77% 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 $79.5B AUM 27.1% 1-Year Est. Return
BWAM
Blue Water Asset Management Grand Rapids, Michigan $310M AUM
HI
Harbour Investments Madison, Wisconsin $7.43B AUM 24.49% 1-Year Est. Return
CAL
Capital Analysts LLC Fort Washington, Pennsylvania $4.34B AUM 17.55% 1-Year Est. Return
GFG
Grantvest Financial Group Matawan, New Jersey $173M AUM 15.36% 1-Year Est. Return

Jane Street's CPST Position: Q4 2025 in Review

Jane Street sold out of Calamos S&P 500 Structured Alt Protection ETF - September (CPST) in Q4 2025, closing a stake of 12,870 shares — an estimated $344K sold.

Jane Street first reported a position in CPST in Q3 2024 and held it in 3 quarters. The position peaked at $635K in Q3 2024. 19 funds tracked by Wall St. Rank hold CPST as of Q4 2025.

  • Jane Street reported no remaining Calamos S&P 500 Structured Alt Protection ETF - September position as of Q4 2025 after selling out during the quarter.
  • Jane Street sold 12,870 Calamos S&P 500 Structured Alt Protection ETF - September shares in Q4 2025, an estimated $344K.
  • Jane Street first reported a position in Calamos S&P 500 Structured Alt Protection ETF - September in Q3 2024 and held it in 3 quarters.
  • Jane Street's Calamos S&P 500 Structured Alt Protection ETF - September position peaked at $635K in Q3 2024.
  • 19 funds tracked by Wall St. Rank held Calamos S&P 500 Structured Alt Protection ETF - September as of Q4 2025.

Based on Jane Street's 13F filing for Q4 2025, filed 12 Feb 2026.