Similar companies
| Company | % of Shares Outstanding | |
|---|---|---|
 |
AGNCAGNC |
9.15% 2.7% |
 |
Gladstone CommercialGOOD |
8.22% 5.9% |
 |
Diversified Healthcare TrustDHC |
5.54% 3.8% |
 |
Presidio PropertySQFT |
4.09% 11% |
 |
SBA CommunicationsSBAC |
3.58% 1.4% |
CoStar Group Short Interest Snapshot
CoStar Group (CSGP) has 14,839,529 shares short (3.66% of shares outstanding), down 21.5% from the prior period — shorts are covering. 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 CSGP 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 15, 2026 | 14,839,529 | 2.69 | |
| Aug 31, 2026 | 18,901,758 | 2.51 | |
| Aug 14, 2026 | 16,691,379 | 2.79 | |
| Jul 31, 2026 | 16,312,412 | 1.92 | |
| Jul 15, 2026 | 16,321,416 | 2.45 | |
| Jun 30, 2026 | 15,266,339 | 1.90 | |
| Jun 15, 2026 | 17,109,207 | 2.39 | |
| May 29, 2026 | 15,095,773 | 2.40 |
Is CoStar Group 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 CSGP, that’s currently 2.69 days against 5,527,541 shares of average daily volume. A low days-to-cover means shorts can exit on normal volume, so short-squeeze risk is muted here.
CSGP 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 CSGP right now:
- CSGP AI Score — 35/100
- Employee Business Outlook — 35% positive (soft)
Read together, this is a quiet-bearish setup: shorting hasn’t built up yet, but the underlying signals are leaning negative. Watch for short interest to follow if conditions worsen.
For the other side of the position, see CSGP insider transactions and congressional trades. For social-side conviction, see CSGP overall sentiment and Reddit mentions.
CoStar Group Short Interest: Frequently Asked Questions
CoStar Group has 14,839,529 shares short — about 3.66% of its shares outstanding as of Sep 15, 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 14,839,529 shares short and 5,527,541 shares of average daily volume, CSGP’s days-to-cover is 2.69. A low days-to-cover means shorts can exit on normal volume, so short-squeeze risk is muted here.
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. CSGP’s days-to-cover at 2.69 is below the classic ~5-day 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.
Sign up and get more insights on CoStar Group.
See CoStar Group’s complete short interest history
Sign up to unlock 1-year and all-time charts for CSGP, plus 25+ alternative data signals, AI Scores, and real-time alerts.
Get Started for FREE
