SSR explained: the 10% trigger, duration, and short-sale price test

What price is the 10% SSR trigger measured from?

Rule 201 covers NMS stocks as defined in the rule; do not treat it as a blanket rule for all OTC securities. It uses the previous regular-session closing price determined by the listing market—not today’s open, intraday high, or your entry price. A simplified reference is trigger price = previous close × 90%. The following examples are fictional and ignore special adjustments such as corporate actions.

The listing market makes the determination using eligible trades reported through the consolidated system during regular trading hours, and the status is disseminated through the applicable processor. A trading app’s own −10% calculation is not official confirmation. See section 1 of the SEC staff FAQ and our guide to gaps and premarket price references.

How long does SSR last, and does a rebound remove it?

The restriction lasts for the remainder of the trigger day and the next trading day—not 24 hours from the trigger time. A Friday trigger continues through Monday if Monday is a trading day; holidays change which day comes next. A rebound above the trigger price does not end it early.

Another decline of at least 10% against the new previous close can trigger it again. A Monday trigger followed by another qualifying Tuesday decline can extend the restriction through Wednesday. Do not use a cumulative decline from an older closing price as the next day’s trigger test.

Regular hours are normally 9:30 a.m.–4 p.m. Eastern, subject to the official session schedule. Triggering only during regular hours does not mean applying only during regular hours. Once triggered, the test applies while a current national best bid is continuously calculated and disseminated under the relevant market-system plan, which can extend beyond regular hours. See section 2 of the SEC FAQ and our extended-hours guide.

Can you short a stock on SSR? Understand the national best bid

Qualifying short sales remain possible. Trading centers must maintain and enforce policies reasonably designed to prevent non-exempt short orders in the restricted security from being displayed or executed at or below the current national best bid (NBB). NBB is a quotation reference, not the last trade. For the basics, read Bid, ask, and spread.

These are simultaneous hypothetical quotes, not order recommendations. NBB moves, and borrow availability, account permissions, order type, and counterparties still matter. The rule is not simply “one cent above the last trade” or “always at the ask.” A limit price does not guarantee a fill; see market, limit, and stop orders.

SSR vs. locates, threshold lists, and trading halts

Regulation SHO is the broader framework. SSR and threshold-list membership concern different parts of it. A stock can be subject to SSR without being on a threshold list, or listed without triggering SSR. A confirmed locate also does not remove the short-sale price test.

Keep the research context together in FennEdge

When FennEdge Scanner surfaces a stock to investigate, save the symbol, observation time, and price reference. Then verify its SSR status and applicable dates with the listing market or broker. A scanner’s percentage change is a starting point, not independent SSR confirmation.

Use FennEdge Research for company context and disclosures, alongside our stock-move research guide to distinguish announcements from interpretations. If delivery failures are also part of the discussion, sign in to the FennEdge Reg SHO tool for dated threshold-list records and original sources. This tool covers threshold lists, not a real-time SSR list.

Record the verified status, source, and lookup time beside the stock in FennEdge Desk. Keep confirmed facts separate from open questions. When reviewing trades in FennEdge Journal, compare those notes with broker order reports to distinguish your research, order restrictions, and actual execution.

Common SSR questions

Is SSR bullish, or does it stop a stock from falling? The rule changes pricing conditions for certain short orders; it does not establish a price floor. Long sales, permitted short sales, and other changes in supply and demand still affect prices. The label cannot establish a coming rebound.

Why is SSR active when the stock is not down 10% now? It may have carried over from the previous trading day, or the stock may have triggered earlier and rebounded. Check the status history rather than the latest percentage alone.

Does this price test apply to selling owned shares or buying to cover? This Rule 201 test addresses short-sale orders. Properly marked long sales and buy-to-cover orders are not short sales, though other rules and broker requirements still apply.

Can I select short exempt to bypass SSR? It is not a general override. Broker marking must satisfy Rule 201’s conditions. An exception from the locate requirement does not automatically exempt an order from the price test; section 5 of the SEC FAQ explains the distinction.