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PACB · Pacific Biosciences Of California, Inc. · Short Interest

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$2.11 -0.03 (-1.40%)
Russell 2000 member Rebalance outlook locked
Market Cap
$665.18M
Shares
310.83M
Volume · Oct 21 13.5M Avg daily vol (3M) 11.02M

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 →

PACB Latest Reported Short Interest

FINRA reported 47,224,448 PACB shares sold short as of the September 30, 2026 settlement date, a decrease of 1,667,777 shares. Days to cover was 2.97 based on FINRA's reported average daily volume.

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

PACB Short Interest Forecast

Equibles' model estimates 43,854,322 shares sold short for the October 15, 2026 settlement, -7.1% versus the latest reported position, with a likely range of 36,895,107 to 49,792,661 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 High confidence 68% chance it falls
43,854,322 -7.1% vs reported
Likely range 36,895,107 to 49,792,661 The latest estimate appears in the chart below. Official release expected Oct 26. Methodology
Short Squeeze Score
66/100
Short interest 15.2% of shares — P95 Days to cover 3.0 — P49 Price vs VWAP +12.9% — P94 Short-volume trend -7.9% — P24 Short interest change -3.4% — P37 Worst FTD 0.02% of shares — P64

Positioning score 66.1 + 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 2026-10-22 13:28 UTC. Options model values may come from a cached snapshot; their original computation time is not supplied. Open interest has its own effective date.

1M 3M 6M 1Y 5Y All
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 47,224,448 48,892,225 -1,667,777 2.97
    2026-09-15 48,892,225 49,578,770 -686,545 10.49
    2026-08-31 49,578,770 53,412,027 -3,833,257 6.75
    2026-08-14 53,412,027 49,004,841 +4,407,186 6.63
    2026-07-31 49,004,841 46,237,636 +2,767,205 7.35
    2026-07-15 46,237,636 47,490,204 -1,252,568 9.97
    2026-06-30 47,490,204 60,560,138 -13,069,934 6.51
    2026-06-15 60,560,138 48,707,384 +11,852,754 10.17
    2026-05-29 48,707,384 59,926,798 -11,219,414 8.57
    2026-05-15 59,926,798 47,090,593 +12,836,205 9.02
    2026-04-30 47,090,593 46,364,406 +726,187 7.04
    2026-04-15 46,364,406 45,631,632 +732,774 8.42
    2026-03-31 45,631,632 41,388,621 +4,243,011 8.41
    2026-03-13 41,388,621 38,191,242 +3,197,379 6.56
    2026-02-27 38,191,242 38,916,811 -725,569 7.14
    2026-02-13 38,916,811 35,591,593 +3,325,218 5.27
    2026-01-30 35,591,593 35,091,747 +499,846 4.25
    2026-01-15 35,091,747 34,003,835 +1,087,912 4.00
    2025-12-31 34,003,835 34,259,532 -255,697 5.31
    2025-12-15 34,259,532 34,042,917 +216,615 5.45
    2025-11-28 34,042,917 33,569,699 +473,218 3.08
    2025-11-14 33,569,699 32,511,384 +1,058,315 3.62
    2025-10-31 32,511,384 34,508,178 -1,996,794 2.86

    Full FINRA short interest reporting calendar

    Showing 1–23 of 23 settlements
    Key facts CIK 1299130 CUSIP 69404D108 13F (30d) 20 filings 20 filers Visit website Investor relations