# Calamos S&P 500 Structured Alt Protection ETF - October (CPSO)

> Source: Nexqual · https://nexqual.com/CPSO · data as of 2026-10-23 14:30 UTC · cite as "Nexqual, Calamos S&P 500 Structured Alt Protection ETF - October (CPSO), nexqual.com/CPSO" · informational, not investment advice.

**Price:** USD 28.45 (-0.04% on the day) · last close of Oct 23, 2026; US market closed, not a live price. Prev close 28.46 · day 28.43–28.45 · 52w 26.73–28.58 · market cap null · PCX

## Key facts
- Total return with dividends: 1Y +5.7% vs S&P 500 +14.0%; 5Y +12.7% vs S&P 500 +76.9%.

## Total return (dividends reinvested)
|  | 1Y (from 2025-10-24) | 5Y (from 2024-09-30) |
|---|---|---|
| Total return | +5.7% | +12.7% |
| S&P 500 (SPY) | +14.0% | +76.9% |
| Per year | +5.7% | +6.0% |
| Volatility (annualized) | 2.2% | 2.6% |
| Max drawdown | -1.4% (Feb 2026→Mar 2026) | -3.0% (Feb 2025→Mar 2025) |

## Peers
CPSA (Calamos S&P 500 Structured Alt ) USD 28.17 -0.11% · CPSN (Calamos S&P 500 Structured Alt ) USD 28.34 +0.07% · CPSJ (Calamos S&P 500 Structured Alt ) USD 28.02 -0.28% · CPRO (Calamos Russell 2000 Structured) USD 28.65 -0.07% · CPSY (Calamos S&P 500 Structured Alt ) USD 26.17 -0.00%

## More
Full page: https://nexqual.com/CPSO · Free keyless MCP server with the same data and citations: https://mcp.nexqual.com/mcp · Guide for agents: https://nexqual.com/agents · https://nexqual.com/llms.txt