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FAST · Fastenal Co · Short Interest

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$49.53 -0.43 (-0.86%) At close · Sep 30
S&P 500 member Nasdaq-100 member Russell 1000 member Rebalance outlook locked
Market Cap
$57.87B
Shares
1.15B
Volume · Sep 30 10.47M Avg daily vol (3M) 7.57M

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 35,653,332 FAST shares sold short as of the September 15, 2026 settlement date, an increase of 1,004,262 shares. Days to cover was 5.78 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 37,589,272 shares sold short for the September 30, 2026 settlement, +5.4% versus the latest reported position, with a likely range of 33,333,418 to 42,229,076 shares. This model prediction uses FINRA data through September 30, 2026; FINRA's official release is expected October 9, 2026.

Model estimate

Expected Sep 30 short interest

as of Sep 30 Medium confidence 58% chance it rises
37,589,272 +5.4% vs reported
Likely range 33,333,418 to 42,229,076 The latest estimate appears in the chart below. Official release expected Oct 9. Methodology
Short Squeeze Score
64/100
Short interest 3.1% of shares — P58 Days to cover 5.8 — P70 Price vs VWAP +1.6% — P81 Short-volume trend +6.2% — P70 Short interest change +2.9% — P56 Worst FTD 0.00% of shares — P39

Positioning score 63.6 + 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 (2026-09-15). 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 2026-10-01 04:58 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
    2026-10-15 Scheduled
    FINRA publishes Oct 26
    		 — — — —
    2026-09-30 Scheduled
    FINRA publishes Oct 9
    		 — — — —
    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
    2025-11-14 27,692,749 26,285,149 +1,407,600 4.20
    2025-10-31 26,285,149 23,784,347 +2,500,802 4.55
    2025-10-15 23,784,347 25,848,771 -2,064,424 2.99

    Full FINRA short interest reporting calendar

    Showing 1–23 of 23 settlements
    Key facts CIK 815556 CUSIP 311900104 13F (30d) 35 filings 19 filers Visit website Investor relations