Calamos CEF Income & Arbitrage ETF (CCEF) is an actively managed exchange-traded fund that seeks high monthly income and long-term capital appreciation through investments in income-producing closed-end funds (CEFs), exchange-traded funds, and business development companies trading at attractive discounts to their net asset value; it employs a relative value arbitrage strategy adapted from Calamos Investments LLC's proven closed-end fund approach, focusing on CEFs that offer distribution yields, options strategies, equities, and fixed-income securities. The fund's portfolio, comprising approximately 46 holdings as of late 2025, includes top positions such as Bexil Investment Trust (BXSY), Eaton Vance Tax Managed Global Buy Write Opportunities Fund (ETW), Liberty All Star Growth Fund (ASG), BlackRock Health Sciences Trust (BME), Virtus Equity & Convertible Income Fund (NIE), BlackRock Enhanced Equity Dividend Trust (BDJ), and Eaton Vance Risk-Managed Diversified Equity Income Fund (ETJ); it targets diversification across sectors and managers like Morgan Stanley, BlackRock, and Franklin Resources, delivering a distribution yield of around 7.90% and 30-day SEC yield of 7.97% as of November 30, 2025. CCEF trades on NYSE Arca under ticker CCEF with CUSIP 12811T407, features a total annual operating expense ratio of 3.19% (including 0.74% management fees and 2.45% acquired fund fees), and pays monthly distributions supplemented by annual capital gains. Launched on January 16, 2024, by Calamos Investments LLC, headquartered in Naperville, Illinois, the ETF marked the firm's first product release of the year as part of an expansion in its liquid alternatives lineup, tapping longstanding expertise in CEF arbitrage without reported subsequent acquisitions, partnerships, funding rounds, or major strategic shifts through December 2025.