About Cerus Corporation (CERS) data
Data as of August 14, 2026.
Cerus Corporation (CERS) has 17.33M shares sold short as of the latest FINRA settlement report on August 14, 2026. Short interest has increased by 15.85% compared with the prior settlement. At the current average daily volume, covering all open short positions would take about 5.07 days (days to cover).
Recent CERS short interest history
| Settlement date | Short interest | Change | Days to cover |
|---|---|---|---|
| Aug 14, 2026 | 17,330,786 | 15.85% | 5.07 |
| Jul 31, 2026 | 14,960,162 | 9.29% | 5.71 |
| Jul 15, 2026 | 13,688,689 | 7.46% | 5.50 |
| Jun 30, 2026 | 12,738,396 | -35.33% | 4.14 |
| Jun 15, 2026 | 19,696,885 | 82.94% | 8.49 |
| May 29, 2026 | 10,766,701 | -41.87% | 4.24 |
| May 15, 2026 | 18,522,745 | 64.31% | 4.00 |
| Apr 30, 2026 | 11,273,044 | 0.61% | 10.51 |
| Apr 15, 2026 | 11,204,876 | 0.77% | 12.45 |
| Mar 31, 2026 | 11,119,137 | 5.78% | 6.30 |
| Mar 13, 2026 | 10,511,205 | 35.08% | 3.61 |
| Feb 27, 2026 | 7,781,596 | -0.47% | 5.69 |
Full history, charts, and borrow-fee detail are on the CERS short interest page.
Frequently asked questions
What is the current short interest in CERS?
As of the latest FINRA settlement dated August 14, 2026, CERS had approximately 17,330,786 shares sold short. Short interest data is reported by FINRA twice per month.
How much does it cost to short CERS?
The latest borrow fee (cost to borrow) for CERS is 0.28% per year, based on IBKR data. Fees can change throughout the trading day as shares are borrowed and returned.
What is the days to cover ratio for CERS?
Days to cover for CERS is approximately 5.07 days. This estimates how many trading days it would take short sellers to buy back all outstanding short shares at the current average daily volume.
Is CERS a short squeeze candidate?
A squeeze needs shorts that are hard to close. CERS trades about 3,417,338 shares a day and would take roughly 5.07 days to unwind current short positions, at a current borrow fee of 0.28%. Higher days-to-cover and a rising borrow fee together are the setup to watch; neither alone is enough.