CPST is a hybrid capital security, not common stock.
This listing is a capital note, preference share, or similar instrument associated with Calamos S&P 500 Structured Alt Protection ETF - September. Data providers report company-level figures against it, so fundamentals, valuation multiples, and dividend history on this page describe the issuing company — not this instrument — and its market capitalization cannot be computed reliably, so it is not shown. The quoted price is the instrument's own.

TTM P/E is undefined. Trailing-twelve-month GAAP EPS is −$43.25 — a loss. Price ÷ a negative earnings number is mathematically a negative ratio but doesn't describe valuation, so the “current” reading and the recent portion of the line chart are blanked. Switch to FWD basis above if analysts expect a return to profitability — that ratio can still be meaningful.
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