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PRLB · Proto Labs Inc · Short Interest

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$87.73 +0.33 (+0.38%) At close · Oct 20
S&P 600 member Russell 2000 member Rebalance outlook locked
Market Cap
$2.10B
Shares
23.92M
Volume · Oct 20 201.39K Avg daily vol (3M) 204.27K

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 →

PRLB Latest Reported Short Interest

FINRA reported 739,819 PRLB shares sold short as of the September 30, 2026 settlement date, a decrease of 14,129 shares. Days to cover was 2.46 based on FINRA's reported average daily volume.

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

PRLB Short Interest Forecast

Equibles' model estimates 746,807 shares sold short for the October 15, 2026 settlement, +0.9% versus the latest reported position, with a likely range of 637,609 to 859,670 shares. This model prediction uses FINRA data through October 15, 2026; FINRA's official release is expected October 26, 2026.

Model estimate

Expected Oct 15 short interest

as of Oct 15 Low confidence 56% chance it falls
746,807 +0.9% vs reported
Likely range 637,609 to 859,670 The latest estimate appears in the chart below. Official release expected Oct 26. Methodology
Short Squeeze Score
53/100
Short interest 3.1% of shares — P58 Days to cover 2.5 — P43 Price vs VWAP +1.6% — P79 Short-volume trend +1.8% — P60 Short interest change -1.9% — P41 Worst FTD 0.00% of shares — P21

Positioning score 53.1 + 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 (2026-09-30). 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 2026-10-21 12:23 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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Dimensions
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    • Short Interest History

    Settlement Date Current Position Previous Position Change Days to Cover
    2026-10-30 Scheduled
    FINRA publishes Nov 10
    		 — — — —
    2026-10-15 Scheduled
    FINRA publishes Oct 26
    		 — — — —
    2026-09-30 739,819 753,948 -14,129 2.46
    2026-09-15 753,948 615,345 +138,603 4.82
    2026-08-31 615,345 656,363 -41,018 3.52
    2026-08-14 656,363 675,490 -19,127 2.99
    2026-07-31 675,490 676,418 -928 4.11
    2026-07-15 676,418 679,916 -3,498 2.76
    2026-06-30 679,916 700,174 -20,258 2.21
    2026-06-15 700,174 644,067 +56,107 3.33
    2026-05-29 644,067 643,691 +376 3.34
    2026-05-15 643,691 612,973 +30,718 2.88
    2026-04-30 612,973 647,664 -34,691 4.49
    2026-04-15 647,664 630,613 +17,051 4.46
    2026-03-31 630,613 586,703 +43,910 3.82
    2026-03-13 586,703 540,900 +45,803 3.44
    2026-02-27 540,900 535,467 +5,433 3.10
    2026-02-13 535,467 515,791 +19,676 1.76
    2026-01-30 515,791 456,341 +59,450 2.95
    2026-01-15 456,341 461,538 -5,197 3.47
    2025-12-31 461,538 542,670 -81,132 2.80
    2025-12-15 542,670 601,534 -58,864 4.65
    2025-11-28 601,534 703,045 -101,511 3.73
    2025-11-14 703,045 609,446 +93,599 2.79
    2025-10-31 609,446 593,032 +16,414 2.54

    Full FINRA short interest reporting calendar

    Showing 1–23 of 23 settlements
    Key facts CIK 1443669 CUSIP 743713109 13F (30d) 30 filings 30 filers Visit website Investor relations