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TNDM · Tandem Diabetes Care Inc · Short Interest

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$16.31 -0.26 (-1.57%) At close · Sep 30
S&P 600 member Russell 2000 member Rebalance outlook locked
Market Cap
$1.09B
Shares
69.58M
Volume · Sep 30 2.2M Avg daily vol (3M) 1.93M

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 →

TNDM Latest Reported Short Interest

FINRA reported 12,474,385 TNDM shares sold short as of the September 15, 2026 settlement date, an increase of 720,566 shares. Days to cover was 7.89 based on FINRA's reported average daily volume.

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

TNDM Short Interest Forecast

Equibles' model estimates 13,011,376 shares sold short for the September 30, 2026 settlement, +4.3% versus the latest reported position, with a likely range of 11,696,791 to 14,591,293 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 High confidence 71% chance it rises
13,011,376 +4.3% vs reported
Likely range 11,696,791 to 14,591,293 The latest estimate appears in the chart below. Official release expected Oct 9. Methodology
Short Squeeze Score
68/100
Short interest 17.9% of shares — P97 Days to cover 7.9 — P81 Price vs VWAP -11.4% — P29 Short-volume trend -2.5% — P35 Short interest change +6.1% — P65 Worst FTD 0.01% of shares — P59

Positioning score 67.5 + 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 01:38 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
    2026-10-15 Scheduled
    FINRA publishes Oct 26
    		 — — — —
    2026-09-30 Scheduled
    FINRA publishes Oct 9
    		 — — — —
    2026-09-15 12,474,385 11,753,819 +720,566 7.89
    2026-08-31 11,753,819 10,585,732 +1,168,087 8.17
    2026-08-14 10,585,732 11,242,544 -656,812 3.89
    2026-07-31 11,242,544 13,115,208 -1,872,664 6.58
    2026-07-15 13,115,208 12,731,073 +384,135 8.73
    2026-06-30 12,731,073 10,854,250 +1,876,823 5.62
    2026-06-15 10,854,250 11,788,786 -934,536 4.07
    2026-05-29 11,788,786 10,801,432 +987,354 4.15
    2026-05-15 10,801,432 9,723,853 +1,077,579 3.35
    2026-04-30 9,723,853 9,643,357 +80,496 6.17
    2026-04-15 9,643,357 10,531,890 -888,533 6.47
    2026-03-31 10,531,890 10,547,769 -15,879 5.05
    2026-03-13 10,547,769 9,763,559 +784,210 6.00
    2026-02-27 9,763,559 8,960,466 +803,093 2.29
    2026-02-13 8,960,466 8,934,137 +26,329 9.17
    2026-01-30 8,934,137 9,004,559 -70,422 6.56
    2026-01-15 9,004,559 8,544,303 +460,256 6.78
    2025-12-31 8,544,303 8,176,917 +367,386 6.70
    2025-12-15 8,176,917 8,753,315 -576,398 4.61
    2025-11-28 8,753,315 8,787,092 -33,777 3.12
    2025-11-14 8,787,092 8,766,366 +20,726 3.09
    2025-10-31 8,766,366 9,237,943 -471,577 5.93
    2025-10-15 9,237,943 9,278,427 -40,484 4.43

    Full FINRA short interest reporting calendar

    Showing 1–23 of 23 settlements
    Key facts CIK 1438133 CUSIP 875372203 13F (30d) 14 filings 8 filers Visit website Investor relations