Reg SHO and Short Selling Rules

Regulation SHO is the SEC's framework governing short selling in US equities. The key rules: shorts must locate borrowable shares before selling short (Rule 203), fails-to-deliver must be closed out within specific timeframes (Rule 204), and stocks with persistent fails appear on the Threshold Securities List.

For penny stocks, Reg SHO Threshold listings often correlate with squeeze potential. A stock landing on the threshold list (13+ days of significant FTDs) triggers forced buy-ins, which can ignite or accelerate a squeeze. Combined with high short interest and low float, a Threshold List entry is one of the higher-information signals for penny-stock squeeze plays.

Key Points

• Locate requirement: brokers must reasonably believe shares can be borrowed before allowing a short sale (Rule 203).
• Fails-to-deliver (FTDs): trades not settled by T+1. Persistent FTDs land a stock on the Reg SHO Threshold List.
• Threshold list: stocks with 13+ days of significant FTDs. Forced buy-ins required.
• Naked shorts: selling without a locate. Generally illegal under Reg SHO, with limited market-maker exceptions.
• For squeezes: threshold listing + high short interest + low float = squeeze fuel. Forced FTD buy-ins drive ignition.

Related Scans

• Top Short Squeeze Penny Stocks
• Nano-Cap Squeezes
• Highest Short Interest

Related Indicators

• Short Float & Short Interest
• Days to Cover (DTC)

Related Concepts

• Short Selling Basics
• FINRA Short Interest Reporting
• Float and Shares Outstanding