NYSE American Files Corporate Action Halt Rules for 23/5 Trading

NYSE American filed an immediately effective rule change with the Securities and Exchange Commission to amend Rule 7.18E, its trading-halts rule, for securities affected by certain issuer corporate actions.

The August 26 Federal Register notice says NYSE American submitted SR-NYSEAMER-2026-73 on August 11. The filing is tied to the industry’s planned move toward 23-hour-a-day, five-day-a-week trading and follows a similar NYSE Arca framework noticed in July.

Under the proposal, NYSE American would declare a regulatory halt after the end of the Late Trading Session and before 9:00 p.m. ET on the day before the market effective date of specified issuer events. Affected securities would resume through a Trading Halt Auction at 8:00 a.m. ET on the effective date.

The enumerated events include trading-symbol changes, CUSIP changes, large dividends, forward and reverse stock splits, de-SPAC transactions, spin-offs, security-type changes, mergers or mandatory exchanges, and other issuer-related events covered by the rule.

Why it matters

More overnight trading increases the need for precise procedures around corporate actions that can change symbols, identifiers, share counts, or security terms. Brokers and active traders need to know when orders may be halted, cancelled, or reopened through an auction instead of continuing normally in extended hours.

What to watch next

Watch NYSE American operational notices and broker disclosures for how order handling, halt messaging, and reopening auctions are implemented as 23/5 equity trading expands.