IMSR Short Interest
Terrestrial Energy Inc. (IMSR) operates in the Energy sector, specifically the Regulated Electric industry, with a market capitalization near $585.9M, listed on NASDAQ, employing roughly 143 people, carrying a beta of 1.86 to the broader market. A developer of advanced nuclear power solutions, specifically small modular molten salt reactors (their “IMSR” technology)–designed to provide low-carbon, high-temperature industrial heat and electricity. Led by Simon Irish, public since 2025-10-24.
Short interest is the total number of shares currently sold short and not yet covered, reported bi-monthly by FINRA. Days to cover (short interest divided by average daily volume) indicates how long it would take short sellers to close positions, with higher values signaling greater squeeze potential.
- Settlement Date
- 2026-04-30
- Short Interest
- 3.4M
- Previous Short Interest
- 3.3M
- Change
- 5.11%
- Days to Cover
- 1.10
- Avg Daily Volume
- 3.1M
- Avg Days to Cover (13 reports)
- 1.54
Showing 13 bi-monthly FINRA short interest reports for Terrestrial Energy Inc..
Learn how short interest is reported and how to read the data →
Frequently asked IMSR short interest questions
- What is the current IMSR short interest?
- As of the Apr 30, 2026 settlement, Terrestrial Energy Inc. (IMSR) short interest is 3.4M shares, a +5.11% change from the prior period. FINRA publishes short interest twice monthly on the 15th and last business day of each month under Rule 4560.
- What is the IMSR days-to-cover ratio?
- Days-to-cover is 1.10, calculated as short interest divided by average daily volume. It estimates how many trading days closing all short positions would consume given typical liquidity. Values above 5 days are commonly cited as elevated; values above 10 days are squeeze-relevant.
- How does IMSR short interest affect options pricing?
- High short interest changes options pricing through three mechanics: borrow-rebate effects (synthetic long stock trades below frictionless put-call parity by approximately the borrow rebate when shares are hard-to-borrow), gamma-squeeze setup risk (if dealers are short gamma against retail call buying, dealer hedge flow can amplify upward moves), and elevated event-vol pricing on names with squeeze potential. See the canonical short-interest documentation for the full mechanism.