About Mersana Therapeutics, Inc. (MRSN) data
Data as of December 31, 2025.
Mersana Therapeutics, Inc. (MRSN) has 13.97K shares sold short as of the latest FINRA settlement report on December 31, 2025. Short interest has decreased by 74.35% compared with the prior settlement. At the current average daily volume, covering all open short positions would take about 0.14 days (days to cover).
Recent MRSN short interest history
| Settlement date | Short interest | Change | Days to cover |
|---|---|---|---|
| Dec 31, 2025 | 13,967 | -74.35% | 1.00 |
| Dec 15, 2025 | 54,446 | 1.19% | 1.06 |
| Nov 28, 2025 | 53,805 | -82.09% | 1.00 |
| Nov 14, 2025 | 300,400 | -7.14% | 1.00 |
| Oct 31, 2025 | 323,501 | 6.52% | 7.14 |
| Oct 15, 2025 | 303,686 | -24.59% | 3.67 |
| Sep 30, 2025 | 402,718 | -5.60% | 9.01 |
| Sep 15, 2025 | 426,625 | -1.54% | 8.60 |
| Aug 29, 2025 | 433,286 | 12.42% | 5.10 |
| Aug 15, 2025 | 385,404 | -3.53% | 3.56 |
| Jul 31, 2025 | 399,525 | -94.96% | 2.75 |
| Jul 15, 2025 | 7,923,496 | -31.00% | 2.81 |
Full history, charts, and borrow-fee detail are on the MRSN short interest page.
Frequently asked questions
What is the current short interest in MRSN?
As of the latest FINRA settlement dated December 31, 2025, MRSN had approximately 13,967 shares sold short. Short interest data is reported by FINRA twice per month.
What is the days to cover ratio for MRSN?
Days to cover for MRSN is approximately 0.14 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 MRSN a short squeeze candidate?
A squeeze needs shorts that are hard to close. MRSN trades about 100,063 shares a day and would take roughly 0.14 days to unwind current short positions. Higher days-to-cover and a rising borrow fee together are the setup to watch; neither alone is enough.