RGEN · Repligen Corp
$166.83
-0.66 (-0.39%)
At close · Aug 14
Market Cap
$9.42B
Shares
56.44M
Shares sold short and not yet covered, reported twice monthly. Days to cover is the reported short position divided by average daily volume.
Model estimate
Expected Aug 14 short interest
as of Aug 14
6,612,609
+7.8% vs reported
Short Squeeze Score
79/100
Short interest 10.9% of shares — P91
Days to cover 3.9 — P58
Price vs VWAP +24.5% — P95
Short-volume trend +5.4% — P71
Short interest change +5.5% — P71
Worst FTD 0.13% of shares — P80
Peer-relative percentile rank across all stocks reporting short interest at the latest settlement date (2026-07-31). Weighted mean of the available factors (short interest 30%, days to cover 20%, price vs VWAP 15%, short-volume trend 15%, short-interest change 10%, fails-to-deliver 10%) plus catalyst boosts (price spike, volume surge, earnings within days), capped at +20 and clamped to 100.
Short Interest History
| Settlement Date | Current Position | Previous Position | Change | Days to Cover |
|---|---|---|---|---|
|
2026-08-31
Scheduled
FINRA publishes Sep 10
|
— | — | — | — |
|
2026-08-14
Scheduled
FINRA publishes Aug 25
|
— | — | — | — |
| 2026-07-31 | 6,132,499 | 5,811,745 | +320,754 | 3.93 |
| 2026-07-15 | 5,811,745 | 6,048,812 | -237,067 | 7.93 |
| 2026-06-30 | 6,048,812 | 5,726,265 | +322,547 | 4.65 |
| 2026-06-15 | 5,726,265 | 5,962,038 | -235,773 | 6.36 |
| 2026-05-29 | 5,962,038 | 5,695,614 | +266,424 | 4.89 |
| 2026-05-15 | 5,695,614 | 5,501,852 | +193,762 | 3.87 |
| 2026-04-30 | 5,501,852 | 5,486,281 | +15,571 | 4.98 |
| 2026-04-15 | 5,486,281 | 5,556,333 | -70,052 | 7.02 |
| 2026-03-31 | 5,556,333 | 4,340,746 | +1,215,587 | 6.26 |
| 2026-03-13 | 4,340,746 | 4,003,984 | +336,762 | 4.67 |
| 2026-02-27 | 4,003,984 | 4,048,179 | -44,195 | 5.05 |
| 2026-02-13 | 4,048,179 | 4,054,509 | -6,330 | 4.83 |
| 2026-01-30 | 4,054,509 | 3,923,966 | +130,543 | 6.77 |
| 2026-01-15 | 3,923,966 | 3,933,025 | -9,059 | 5.67 |
| 2025-12-31 | 3,933,025 | 4,120,083 | -187,058 | 7.59 |
| 2025-12-15 | 4,120,083 | 4,309,467 | -189,384 | 6.20 |
| 2025-11-28 | 4,309,467 | 4,085,106 | +224,361 | 6.32 |
| 2025-11-14 | 4,085,106 | 3,320,400 | +764,706 | 4.55 |
| 2025-10-31 | 3,320,400 | 3,382,265 | -61,865 | 2.68 |
| 2025-10-15 | 3,382,265 | 3,414,338 | -32,073 | 3.22 |
| 2025-09-30 | 3,414,338 | 3,541,604 | -127,266 | 3.85 |
| 2025-09-15 | 3,541,604 | 3,624,017 | -82,413 | 4.87 |
| 2025-08-29 | 3,624,017 | 3,898,921 | -274,904 | 5.44 |
Showing 1–23 of 23 settlements
Key facts
CIK
730272
CUSIP
759916109
13F (30d)
461 filings
436 filers
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Investor relations