RGEN
Repligen Corp
stockNASDAQ
At CloseOct 21, 2026 3:59:58 PM EDT
179.99USD+0.623%(+1.11)903,856
Pre-marketOct 21, 2026 8:49:30 AM EDT
174.00USD-2.728%(-4.88)
As of 2026-09-30, there were 7,581,634 shares short with a short interest of 14.21%.
RGEN Short Interest - Official
RGEN Short Position Change - Official
RGEN Short Interest - Official
| Settlement Date1 | Short Interest % | Short Position | Days to Cover2 | Short Position Change | Short Position Change % | Shares Out | Shares Float |
|---|---|---|---|---|---|---|---|
| 2026-09-30 | 14.21 | 7,581,634 | 6.61 | +868,941 | +12.94 | 56,435,621 | 53,368,099 |
| 2026-09-15 | 12.58 | 6,712,693 | 7.09 | +99,816 | +1.51 | 56,435,621 | 53,368,099 |
| 2026-08-31 | 12.39 | 6,612,877 | 6.68 | +527,564 | +8.67 | 56,435,621 | 53,368,099 |
| 2026-08-14 | 11.40 | 6,085,313 | 6.44 | -47,186 | -0.77 | 56,435,621 | 53,368,099 |
| 2026-07-31 | 11.49 | 6,132,499 | 3.93 | +320,754 | +5.52 | 56,435,621 | 53,368,099 |
| 2026-07-15 | 10.89 | 5,811,745 | 7.93 | -237,067 | -3.92 | 56,407,740 | 53,362,286 |
| 2026-06-30 | 11.34 | 6,048,812 | 4.65 | +322,547 | +5.63 | 56,407,740 | 53,361,722 |
| 2026-06-15 | 10.73 | 5,726,265 | 6.36 | +30,651 | +0.54 | 56,407,740 | 53,361,722 |
| 2026-05-15 | 10.67 | 5,695,614 | 3.87 | +193,762 | +3.52 | 56,407,740 | 53,363,320 |
| 2026-04-30 | 10.44 | 5,501,852 | 4.98 | +15,571 | +0.28 | 56,399,274 | 52,682,512 |
| 2026-04-15 | 10.41 | 5,486,281 | 7.02 | -70,052 | -1.26 | 56,399,274 | 52,682,512 |
| 2026-03-31 | 10.55 | 5,556,333 | 6.26 | +1,215,587 | +28.00 | 56,331,110 | 52,682,512 |
| 2026-03-13 | 8.24 | 4,340,746 | 4.67 | +336,762 | +8.41 | 56,331,110 | 52,682,512 |
| 2026-02-27 | 7.60 | 4,003,984 | 5.05 | -44,195 | -1.09 | 56,325,429 | 52,682,512 |
| 2026-02-13 | 7.68 | 4,048,179 | 4.83 | -6,330 | -0.16 | 56,290,749 | 52,682,512 |
| 2026-01-30 | 7.70 | 4,054,509 | 6.77 | +130,543 | +3.33 | 56,290,749 | 52,682,512 |
| 2026-01-15 | 7.45 | 3,923,966 | 5.67 | -9,059 | -0.23 | 56,290,749 | 52,682,512 |
| 2025-12-31 | 7.47 | 3,933,025 | 7.59 | -187,058 | -4.54 | 56,290,749 | 52,682,512 |
| 2025-12-15 | 7.82 | 4,120,083 | 6.20 | -189,384 | -4.39 | 56,290,749 | 52,685,327 |
| 2025-11-28 | 8.18 | 4,309,467 | 6.32 | +224,361 | +5.49 | 56,290,749 | 52,693,770 |
| 2025-11-14 | 7.75 | 4,085,106 | 4.55 | +764,706 | +23.03 | 56,290,749 | 52,692,081 |
| 2025-10-31 | 6.31 | 3,320,400 | 2.68 | -61,865 | -1.83 | 56,257,618 | 52,659,381 |
Historical data is split-adjusted.
1 Data from Finra. Finra publishes an updated file every two weeks.
2 Days to Cover (DTC) is also called Short Ratio. This is the Short Position / Average Daily Trading Volume.