OneChicago | 291 followers on LinkedIn. OneChicago (OCX) is the only US equity finance exchange for trading security futures and the related EFP. Regulated by the SEC and CFTC, OCX lists approximately 2,000 products, including ADRs, ETFs and OCX.NoDivRisk® contracts. Contracts are cleared through the centralized counterparty, “AA+”-rated OCC.