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Equibles

UMC · United Microelectronics Corp · Short Interest

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$19.98 -0.10 (-0.50%)
Rebalance outlook locked
Market Cap
$49.21B
Shares
2.51B
Volume · Oct 20 9.28M Avg daily vol (3M) 12.28M

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 →

UMC Latest Reported Short Interest

FINRA reported 27,794,121 UMC shares sold short as of the September 30, 2026 settlement date, a decrease of 10,606,140 shares. Days to cover was 2.39 based on FINRA's reported average daily volume.

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

UMC Short Interest Forecast

Equibles' model estimates 27,566,627 shares sold short for the October 15, 2026 settlement, -0.8% versus the latest reported position, with a likely range of 22,872,305 to 32,185,857 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 60% chance it falls
27,566,627 -0.8% vs reported
Likely range 22,872,305 to 32,185,857 The latest estimate appears in the chart below. Official release expected Oct 26. Methodology
Short Squeeze Score
40/100
Short interest 1.1% of shares — P41 Days to cover 2.4 — P42 Price vs VWAP -6.2% — P48 Short-volume trend -5.3% — P32 Short interest change -27.6% — P11 Worst FTD 0.02% of shares — P64

Positioning score 40.1 + 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.

No listed expiration after today falls within the next 30 calendar days.

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 2026-10-20 22:00 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
    2026-10-30 Scheduled
    FINRA publishes Nov 10
    		 — — — —
    2026-10-15 Scheduled
    FINRA publishes Oct 26
    		 — — — —
    2026-09-30 27,794,121 38,400,261 -10,606,140 2.39
    2026-09-15 38,400,261 33,668,171 +4,732,090 3.56
    2026-08-31 33,668,171 29,695,086 +3,973,085 2.96
    2026-08-14 29,695,086 34,193,634 -4,498,548 2.58
    2026-07-31 34,193,634 20,511,587 +13,682,047 1.90
    2026-07-15 20,511,587 26,177,159 -5,665,572 1.24
    2026-06-30 26,177,159 25,331,010 +846,149 1.31
    2026-06-15 25,331,010 26,098,399 -767,389 1.35
    2026-05-29 26,098,399 26,916,938 -818,539 1.46
    2026-05-15 26,916,938 26,664,075 +252,863 1.64
    2026-04-30 26,664,075 25,829,756 +834,319 1.77
    2026-04-15 25,829,756 30,266,600 -4,436,844 3.07
    2026-03-31 30,266,600 34,188,481 -3,921,881 3.70
    2026-03-13 34,188,481 30,437,470 +3,751,011 3.98
    2026-02-27 30,437,470 31,611,829 -1,174,359 4.66
    2026-02-13 31,611,829 31,857,208 -245,379 2.99
    2026-01-30 31,857,208 48,007,369 -16,150,161 1.73
    2026-01-15 48,007,369 42,091,913 +5,915,456 4.07
    2025-12-31 42,091,913 45,911,313 -3,819,400 6.51
    2025-12-15 45,911,313 47,854,483 -1,943,170 4.91
    2025-11-28 47,854,483 50,568,495 -2,714,012 5.78
    2025-11-14 50,568,495 52,022,809 -1,454,314 6.06
    2025-10-31 52,022,809 48,044,444 +3,978,365 6.88

    Full FINRA short interest reporting calendar

    Showing 1–23 of 23 settlements
    Key facts CIK 1033767 CUSIP 910873405 13F (30d) 48 filings 43 filers Visit website Investor relations