Biggest short-interest movers, October 20, 2026: CoreWeave leads the builds
Produced automatically from ORTEX data and published under the ORTEX News editorial standards set by Peter Hillerberg, Editor, ORTEX News. How we publish
US
Short sellers added most to CoreWeave (CRWV): short interest rose 1.5 points in a session to 23.7% of free float, against a one-year high of 32.2%, and is up 3.7 points on the week, while the stock lost 20.2% over the week.
The largest cover was in Kailera Therapeutics (KLRA), where short interest fell 1.4 points to 14.0%, while the stock gained 19.7% over the week.
Across the 2077 US stocks above $1B we track, short interest rose in 970 and fell in 1090.
CRWV and AADX were also among the biggest builds in the previous edition.
Biggest short-interest builds: US
| Company | Ticker | SI % free float | 1-day change | 1-week change | Days to cover | Cost to borrow |
|---|---|---|---|---|---|---|
| CoreWeave, Inc. | CRWV | 23.7% | +1.5 pts | +3.7 pts | 1.7 | 0.47% |
| Pulse Biosciences, Inc. | PLSE | 16.6% | +1.0 pts | +1.4 pts | 7.5 | 1.30% |
| Costamare Inc. | CMRE | 6.2% | +0.85 pts | +1.0 pts | 7.3 | 0.83% |
| Madison Air Solutions Corporation | MAIR | 11.1% | +0.84 pts | +0.57 pts | 4.4 | 0.52% |
| Corsair Gaming, Inc. | CRSR | 20.8% | +0.84 pts | +0.38 pts | 8.8 | 0.47% |
| Vistance Networks, Inc. | VISN | 20.3% | +0.77 pts | +1.3 pts | 8.1 | 0.59% |
| Maze Therapeutics, Inc. | MAZE | 18.9% | +0.74 pts | +0.62 pts | 7.7 | 0.50% |
| Applied Aerospace & Defense, Inc. | AADX | 16.0% | +0.65 pts | +3.4 pts | 3.1 | 1.15% |
| Recursion Pharmaceuticals, Inc. | RXRX | 27.0% | +0.62 pts | +0.55 pts | 5.1 | 0.84% |
| Verastem, Inc. | VSTM | 13.8% | +0.60 pts | -0.38 pts | 2.9 | 0.48% |
Biggest short-interest covers: US
| Company | Ticker | SI % free float | 1-day change | 1-week change | Days to cover | Cost to borrow |
|---|---|---|---|---|---|---|
| Kailera Therapeutics, Inc. | KLRA | 14.0% | -1.4 pts | -0.82 pts | 5.5 | 0.82% |
| Wolfspeed, Inc. | WOLF | 85.6% | -1.2 pts | -0.52 pts | 5.8 | 1.97% |
| ChronoScale Holdings Corporation | CHRN | 14.0% | -1.1 pts | -0.82 pts | 4.2 | 26.35% |
| Medtronic plc | MDT | 4.5% | -1.0 pts | -5.3 pts | 1.6 | 10.11% |
| Five9, Inc. | FIVN | 13.4% | -0.87 pts | +0.02 pts | 4.9 | 0.50% |
| Blue Bird Corporation | BLBD | 15.8% | -0.75 pts | +1.6 pts | 8.4 | 0.49% |
| GPGI, Inc. | GPGI | 20.2% | -0.73 pts | +0.12 pts | 19.1 | 0.72% |
| Sarepta Therapeutics, Inc. | SRPT | 22.2% | -0.73 pts | -2.3 pts | 7.1 | 0.42% |
| Cipher Digital Inc. | CIFR | 21.8% | -0.67 pts | -0.39 pts | 1.7 | 0.50% |
| RUM Group Inc. | RUM | 25.4% | -0.64 pts | +0.29 pts | 8.3 | 3.26% |
Stocks in this article
- CRWVCRWV data on ORTEX
- KLRAKLRA data on ORTEX
- AADXAADX data on ORTEX
- PLSEPLSE data on ORTEX
- CMRECMRE data on ORTEX
- MAIRMAIR data on ORTEX
- CRSRCRSR data on ORTEX
- VISNVISN data on ORTEX
- MAZEMAZE data on ORTEX
- RXRXRXRX data on ORTEX
- VSTMVSTM data on ORTEX
- WOLFWOLF data on ORTEX
- CHRNCHRN data on ORTEX
- MDTMDT data on ORTEX
- FIVNFIVN data on ORTEX
- BLBDBLBD data on ORTEX
- GPGIGPGI data on ORTEX
- SRPTSRPT data on ORTEX
- CIFRCIFR data on ORTEX
- RUMRUM data on ORTEX
How this article was generated
- Generated
- 21 Oct 2026, 12:37
- Data as of
- 20 Oct 2026, 00:00
- Prompt version
- roundup-v1
- Data sources
- Short interestCost to borrow
ORTEX Market Intelligence content is generated by AI from a snapshot of ORTEX's proprietary data and reviewed by the ORTEX team. Content is informational only and does not constitute investment advice.