According to the source, a U.S. federal government shutdown would put the SEC on a limited-operations plan where most routine reviews and accelerations pause while EDGAR remains available for filings, per the SEC Operations Plan Under a Lapse in Appropriations. For pending crypto ETFs, exchange rule changes (Form 19b-4) are governed by statutory timelines measured from Federal Register publication; under Exchange Act Section 19(b)(2), the Commission must approve or disapprove within up to 240 days or the proposal is deemed approved, per the Securities Exchange Act of 1934 and the Federal Register. Spot BTC or ETH commodity-trust ETFs also require an effective registration statement before shares can be offered; during shutdown plans, the Division of Corporation Finance indicates it cannot review or accelerate effectiveness, which can delay timing, per the SEC Operations Plan and Securities Act Section 8(a). Listing can occur only when both the 19b-4 exchange rule change is approved and the issuer’s registration statement is effective, as reflected in the SEC’s January 10, 2024 spot Bitcoin ETF approval orders, per the SEC Order Approving Spot Bitcoin ETFs and related issuer filings.