Calamos Russell 2000 Structured Alt Protection ETF - July (CPRJ) is an actively managed exchange-traded fund that seeks to provide positive price return exposure to the Russell 2000 Index, measured through the iShares Russell 2000 ETF (IWM), up to a predefined cap while offering 100% downside protection against losses over a one-year outcome period before fees and expenses; it achieves these outcomes through a portfolio of FLEX options, including long call and put options on IWM and short call options, resulting in defined cap rates, protection levels, and floor values that reset annually on the first trading day of July. Launched on July 1, 2024, and listed on NYSE Arca, the ETF targets investors seeking equity risk control on small-cap exposure, tax-advantaged cash alternatives with upside potential, or capital preservation for retirement portfolios; it operates with a net expense ratio of 0.69% and benchmarks performance against the MerQube Capital Protected US Small Cap Index. Headquartered in Naperville, Illinois, as part of Calamos Investments LLC's broader suite of Structured Protection ETFs—which also includes offerings tied to the S&P 500, Nasdaq-100, and Bitcoin—the fund serves U.S. investors with assets under management reaching approximately $54 million as of late 2025 and trades primarily at a slight discount to net asset value. In a significant launch milestone during June 2024, Calamos announced and introduced CPRJ as the first ETF to deliver 100% downside protection specifically to the Russell 2000 over one year, with an initial upside cap range of 10.5%-11.2% that adjusted to 11.20% at inception; this expanded Calamos' Structured Protection lineup to cover leading U.S. equity benchmarks, leveraging the firm's alternatives and options expertise without reported subsequent acquisitions, partnerships, or major strategic shifts specific to CPRJ through December 2025.