What is the FINRA Threshold Securities List?
The FINRA Threshold Securities List is the official Regulation SHO list of stocks with persistent settlement failures, published daily by FINRA and the listing exchanges since 2005.
FINRA Threshold List: Plain-English Definition
The FINRA Threshold Securities List is the official daily list of U.S. equities that have accumulated persistent failures-to-deliver (FTDs) under Regulation SHO. A stock lands on the list when aggregate FTDs exceed both 10,000 shares and 0.5% of total shares outstanding for five consecutive settlement days. Inclusion means short positions in the name are already failing to settle on time at the clearinghouse — concrete evidence of borrow scarcity and forced-cover pressure that has crossed from the loan market into actual settlement plumbing.
How It Is Calculated
The criteria, codified in Reg SHO Rule 203(b)(3) and published daily by FINRA, NYSE, Nasdaq, and the OTC market operators:
A stock is added to the Threshold List if, for 5 consecutive settlement days:
Aggregate FTDs ≥ 10,000 shares
AND
Aggregate FTDs ≥ 0.5% of Total Shares Outstanding
A stock is removed once FTDs fall below those levels for 5 consecutive days.Once on the list, broker-dealers must close out the FTD position within 13 consecutive settlement days under the Rule 204 close-out requirement, or face restrictions on further short sales in the security. Reg SHO was instituted in January 2005 specifically to address chronic settlement failures that had previously gone unresolved for weeks or months.
Worked Example
A stock with 80 million shares outstanding lands on the Threshold List once aggregate FTDs exceed 400,000 shares (0.5% of 80M) for five straight settlement days, assuming the 10,000-share floor is also cleared. During the January 2021 meme cycle, GME, AMC, BBBY, and KOSS appeared on the Threshold List for multiple consecutive weeks, with FTDs at GME peaking above 2 million shares per day according to SEC FTD bulk files. Inclusion in that period correlated with the most violent leg of the squeeze, since dealers and prime brokers were scrambling to source shares to settle pre-existing trades while new short demand kept arriving.
What Inclusion Means
Threshold-list status indicates that settlement-level covering pressure already exists — distinct from positioning metrics like short interest or float utilization, which describe intent to be short rather than failure to settle. Squeeze hunters treat threshold-list appearance as a confirming signal, not a leading one: by the time a name shows up, borrow fees and utilization have usually been elevated for weeks. Compliance desks use it to track close-out obligations under Rule 204. Some academic research (Boni 2006, Fotak/Raman/Yadav 2014) found a measurable link between threshold-list inclusion and subsequent short-term price performance, though the effect is noisy and not a standalone signal.
Tapeboard's Expanded "T" Flag
The official FINRA threshold-list URLs that previously served bulk daily files began returning 403 and 404 errors in early 2026. To preserve continuity, Tapeboard's "T" flag on the short squeeze leaderboard is now derived from the FINRA Consolidated NMS daily short-volume files at cdn.finra.org/equity/regsho/daily/. A symbol receives the T flag when its daily reported short volume exceeds 50% of total reported volume for a sustained window — a related but distinct condition from the official Reg SHO threshold criteria. This is a sustained heavy-shorting flag, not a settlement-failure flag. The two will overlap for many of the same names but they are not the same metric, and readers should treat Tapeboard's T flag as a directional indicator of persistent short-selling pressure rather than as a substitute for the official FINRA threshold list.
Limitations and Common Misconceptions
Threshold-list appearance is descriptive, not predictive — by the time the five-day persistence test triggers, the move has typically already been underway. The list does not measure naked shorting or fraud; FTDs occur for many benign reasons including ETF creation/redemption mismatches, fractional-share settlements, and market-maker exemptions. The 0.5% outstanding threshold is also disproportionate across cap tiers: a small-cap with 20M shares only needs 100K FTDs to qualify, while a mega-cap needs millions, so list inclusion is structurally more common in small names. Finally, removal from the list does not mean the short pressure has resolved — it only means FTDs fell below the trigger for five consecutive days, which can happen via partial close-outs without any meaningful change in the underlying short position.