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FAST · Fastenal Co · Short Interest

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$55.19 -0.36 (-0.65%) At close · Nov 13 Play latest call Q3 2026 earnings call transcript
S&P 500 member Nasdaq-100 member Russell 1000 member Rebalance outlook locked
Market Cap
$63.32B
Shares
1.15B
Volume · Nov 13 4.43M Avg daily vol (3M) 7.11M

Shares sold short and not yet covered, reported twice monthly. Days to cover is the reported short position divided by average daily volume.

Pull short interest history through the short interest API or MCP →

FAST Latest Reported Short Interest

FINRA reported 38,315,307 FAST shares sold short as of the October 30, 2026 settlement date, an increase of 1,284,190 shares. Days to cover was 5.12 based on FINRA's reported average daily volume.

Official FINRA short-interest data · share counts are restated for subsequent splits of this listing

FAST Short Interest Forecast

Equibles' model estimates 38,737,124 shares sold short for the November 13, 2026 settlement, +1.1% versus the latest reported position, with a likely range of 34,508,098 to 42,933,360 shares. This model prediction uses FINRA data through November 13, 2026; FINRA's official release is expected November 24, 2026.

Model estimate

Expected Nov 13 short interest

as of Nov 13 Low confidence 59% chance it falls
38,737,124 +1.1% vs reported
Likely range 34,508,098 to 42,933,360 The latest estimate appears in the chart below. Official release expected Nov 24. Methodology
Short Squeeze Score
59/100
Short interest 3.3% of shares — P61 Days to cover 5.1 — P67 Price vs VWAP +8.1% — P87 Short-volume trend -3.9% — P39 Short interest change +3.5% — P67 Worst FTD 0.00% of shares — P19

Positioning score 59.0 + catalyst boost 0 (total capped at 100). This is a screening index, not a probability of a squeeze.

Method and coverage limits

Factor percentiles compare eligible primary operating-company stocks reporting short interest at the latest settlement date (2026-10-30). The weighted mean uses short interest 30%, days to cover 20%, price vs VWAP 15%, short-volume trend 15%, short-interest change 10%, and fails-to-deliver 10%. Missing factors redistribute their weight; incomplete coverage is not evidence of low risk. Price, volume, and earnings boosts add 10 each, capped at 20.

Shares outstanding are not free float. Borrow fees, utilization, lendable supply, recalls, and dealer inventory are not measured. Short-sale volume does not measure the change in open shorts; fails to deliver are not a borrow-cost measurement; price vs VWAP does not establish short sellers' entry prices. Earnings can move prices in either direction.

The weights are judgment-based, not calibrated to future squeeze outcomes. The separate options assessment below does not change this universe ranking.

Options positioning & squeeze sensitivity

Nearest expiration after today within 30 calendar days; same-day expirations and later maturities are excluded.

Open interest is incomplete, stale, or dated inconsistently; positioning totals are unavailable.

Open interest has both a buyer and a seller; it does not reveal dealer hedge direction. Gross gamma sums both calls and puts without netting and uses a local 1% price-change approximation. It measures sensitivity, not predicted buying or a squeeze probability.

Assessment prepared 2026-11-15 05:30 UTC. Options model values may come from a cached snapshot; their original computation time is not supplied. Open interest has its own effective date.

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    • Short Interest History

    Settlement Date Current Position Previous Position Change Days to Cover
    2026-11-30 Scheduled
    FINRA publishes Dec 9
    		 — — — —
    2026-11-13 Scheduled
    FINRA publishes Nov 24
    		 — — — —
    2026-10-30 38,315,307 37,031,117 +1,284,190 5.12
    2026-10-15 37,031,117 34,618,329 +2,412,788 4.24
    2026-09-30 34,618,329 35,653,332 -1,035,003 4.60
    2026-09-15 35,653,332 34,649,070 +1,004,262 5.78
    2026-08-31 34,649,070 31,204,882 +3,444,188 6.27
    2026-08-14 31,204,882 35,899,233 -4,694,351 3.96
    2026-07-31 35,899,233 31,475,902 +4,423,331 4.32
    2026-07-15 31,475,902 30,905,562 +570,340 3.40
    2026-06-30 30,905,562 31,320,552 -414,990 3.75
    2026-06-15 31,320,552 28,459,231 +2,861,321 4.81
    2026-05-29 28,459,231 28,159,863 +299,368 4.12
    2026-05-15 28,159,863 24,523,768 +3,636,095 4.35
    2026-04-30 24,523,768 24,252,255 +271,513 3.97
    2026-04-15 24,252,255 27,514,034 -3,261,779 2.86
    2026-03-31 27,514,034 31,136,708 -3,622,674 3.28
    2026-03-13 31,136,708 31,926,847 -790,139 3.95
    2026-02-27 31,926,847 33,154,548 -1,227,701 4.96
    2026-02-13 33,154,548 34,665,326 -1,510,778 3.29
    2026-01-30 34,665,326 31,511,673 +3,153,653 3.36
    2026-01-15 31,511,673 31,434,778 +76,895 3.68
    2025-12-31 31,434,778 31,452,298 -17,520 4.53
    2025-12-15 31,452,298 29,427,595 +2,024,703 4.54
    2025-11-28 29,427,595 27,692,749 +1,734,846 4.35

    Full FINRA short interest reporting calendar

    Showing 1–23 of 23 settlements
    Key facts CIK 815556 CUSIP 311900104 13F (30d) 1197 filings 1124 filers Visit website Investor relations