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MRK · Merck & Co., Inc. · Short Interest

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$145.42 +0.71 (+0.49%)
S&P 500 member Russell 1000 member Dow 30 member Rebalance outlook locked
Market Cap
$357.02B
Shares
2.47B

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 →

MRK Latest Reported Short Interest

FINRA reported 30,287,347 MRK shares sold short as of the August 31, 2026 settlement date, an increase of 5,780,827 shares. Days to cover was 2.23 based on FINRA's reported average daily volume.

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

MRK Short Interest Forecast

Equibles' model estimates 30,452,760 shares sold short for the September 15, 2026 settlement, +0.5% versus the latest reported position, with a likely range of 26,287,649 to 34,929,470 shares. This model prediction uses FINRA data through September 10, 2026; FINRA's official release is expected September 24, 2026.

Model estimate

Expected Sep 15 short interest

as of Sep 10 Low confidence 55% chance it falls
30,452,760 +0.5% vs reported
Likely range 26,287,649 to 34,929,470 The latest estimate appears in the chart below. Official release expected Sep 24. Methodology
Short Squeeze Score
53/100
Short interest 1.2% of shares — P42 Days to cover 2.2 — P38 Price vs VWAP +9.4% — P86 Short-volume trend +0.1% — P49 Short interest change +23.6% — P85 Worst FTD 0.00% of shares — P36

Positioning score 52.6 + 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 (2026-08-31). 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 2026-09-11 13:25 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
    2026-09-30 Scheduled
    FINRA publishes Oct 9
    		 — — — —
    2026-09-15 Scheduled
    FINRA publishes Sep 24
    		 — — — —
    2026-08-31 30,287,347 24,506,520 +5,780,827 2.23
    2026-08-14 24,506,520 28,281,375 -3,774,855 2.84
    2026-07-31 28,281,375 29,359,028 -1,077,653 3.25
    2026-07-15 29,359,028 31,381,267 -2,022,239 3.42
    2026-06-30 31,381,267 30,267,292 +1,113,975 2.30
    2026-06-15 30,267,292 30,545,853 -278,561 2.57
    2026-05-29 30,545,853 29,060,187 +1,485,666 3.06
    2026-05-15 29,060,187 26,205,868 +2,854,319 3.63
    2026-04-30 26,205,868 27,495,690 -1,289,822 2.55
    2026-04-15 27,495,690 27,720,957 -225,267 3.31
    2026-03-31 27,720,957 29,144,880 -1,423,923 2.53
    2026-03-13 29,144,880 31,115,811 -1,970,931 3.06
    2026-02-27 31,115,811 28,130,031 +2,985,780 3.00
    2026-02-13 28,130,031 28,729,402 -599,371 1.70
    2026-01-30 28,729,402 33,654,686 -4,925,284 2.38
    2026-01-15 33,654,686 32,573,724 +1,080,962 2.55
    2025-12-31 32,573,724 37,162,304 -4,588,580 2.33
    2025-12-15 37,162,304 31,943,311 +5,218,993 2.63
    2025-11-28 31,943,311 27,626,151 +4,317,160 1.77
    2025-11-14 27,626,151 25,815,354 +1,810,797 2.15
    2025-10-31 25,815,354 26,700,419 -885,065 2.52
    2025-10-15 26,700,419 25,174,694 +1,525,725 2.11
    2025-09-30 25,174,694 27,709,865 -2,535,171 1.76
    2025-09-15 27,709,865 23,829,923 +3,879,942 2.39

    Full FINRA short interest reporting calendar

    Showing 1–24 of 24 settlements
    Key facts CIK 310158 CUSIP 58933Y105 13F (30d) 1022 filings 964 filers Visit website Investor relations