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Tandem Diabetes Care Short Interest Snapshot
Tandem Diabetes Care (TNDM) has 13,369,091 shares short (19.21% of shares outstanding), up 7.2% from the prior period — shorts are building. The data is biweekly short interest reported to NASDAQ, with a built-in 2-week reporting lag — the same canonical figure short-interest trackers publish.
Recent TNDM Short Interest Settlements
Each row is a biweekly snapshot — the cadence at which short interest is officially reported. The percent column is the change versus the prior settlement.
| Settlement Date | Shares Short | vs Prior | Days to Cover |
|---|---|---|---|
| Sep 30, 2026 | 13,369,091 | 5.25 | |
| Sep 15, 2026 | 12,474,385 | 7.89 | |
| Aug 31, 2026 | 11,753,819 | 8.17 | |
| Aug 14, 2026 | 10,585,732 | 3.89 | |
| Jul 31, 2026 | 11,242,544 | 6.58 | |
| Jul 15, 2026 | 13,115,208 | 8.73 | |
| Jun 30, 2026 | 12,731,073 | 5.62 | |
| Jun 15, 2026 | 10,854,250 | 4.07 |
Is Tandem Diabetes Care Heavily Shorted?
"Days to cover" is the number of average trading days it would take shorts to buy back their position at recent volume. For TNDM, that’s currently 5.25 days against 2,548,341 shares of average daily volume. Days to cover above 5 is elevated and worth watching — a sustained upside move could put visible pressure on the short side.
TNDM Short Interest in Context
Short interest is most useful read against the rest of the picture. Heavy shorting that lines up with insider selling and weakening Employee Business Outlook is a different story from heavy shorting with insider buying and a positive AI Score — the same number, very different setups.
The other signals on TNDM right now:
- TNDM AI Score — 38/100
- Employee Business Outlook — 30% positive (soft)
Read together, this is a consensus-bearish setup: heavy shorting lines up with weak fundamentals or sentiment. Shorts and the rest of the picture are pointing the same direction here.
For the other side of the position, see TNDM insider transactions and congressional trades. For social-side conviction, see TNDM overall sentiment and Reddit mentions.
Tandem Diabetes Care Short Interest: Frequently Asked Questions
Tandem Diabetes Care has 13,369,091 shares short — about 19.21% of its shares outstanding as of Sep 30, 2026. This figure is the official biweekly short interest report, which lags the settlement date by about two weeks — the same convention every short-interest tracker uses. (Note: "% of shares outstanding" runs slightly below the "% of float" you may see on MarketBeat or Fintel, since float excludes insider-held and restricted shares.)
At 13,369,091 shares short and 2,548,341 shares of average daily volume, TNDM’s days-to-cover is 5.25. Days to cover above 5 is elevated and worth watching — a sustained upside move could put visible pressure on the short side.
Short squeezes happen when heavily shorted stocks rally sharply, forcing shorts to buy back at higher prices. The classic warning signs are days-to-cover above ~5, rising short interest, and a catalyst that pushes price up. TNDM currently meets the days-to-cover threshold. AltIndex tracks short interest alongside insider activity and sentiment — the same number reads very differently depending on what those other signals say.
The biweekly short interest figures come from NASDAQ’s official short interest report — the same source used by MarketBeat, Fintel, and Benzinga. The data is settlement-date-based, published twice a month, and lags about two weeks. For daily short-selling activity (a higher-frequency complement), see the short squeeze tracker.
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