TMDX Short Volume
TransMedics Group, Inc. (TMDX) operates in the Healthcare sector, specifically the Medical - Devices industry, with a market capitalization near $2.62B, listed on NASDAQ, employing roughly 898 people, carrying a beta of 1.93 to the broader market. TransMedics Group, Inc. Led by Waleed H. Hassanein, public since 2019-05-02.
Short volume measures the number of shares sold short on a given day as reported by FINRA. Tracking short volume relative to total volume helps identify unusual bearish sentiment or short-squeeze potential.
- Latest Date
- 2026-10-15
- Short Volume
- 255.2K
- Total Volume
- 464.6K
- Short %
- 54.93%
- 30-Day Avg Short %
- 54.61%
Showing 30 days of FINRA short volume data for TransMedics Group, Inc..
Learn how short volume is reported and how to read the data →
TMDX most-active contracts
| Type | Strike | Expiration | Volume | OI | IV | Bid | Ask |
|---|---|---|---|---|---|---|---|
| CALL | $80.00 | Oct 16, 2026 | 0 | 3.0K | 90.1% | $0.15 | $1.10 |
Top 1 contracts from the institutional-grade nightly options scan; ranked by volume within the broader S&P 500/400/600 + ETF universe.
Frequently asked TMDX short volume questions
- What is the daily TMDX short volume?
- As of Oct 15, 2026, TransMedics Group, Inc. (TMDX) short volume is 255.2K shares against 464.6K total reported volume, or 54.93% short-side. Short volume measures shares sold short during the day; it is flow, not inventory.
- How is TMDX short volume reported?
- FINRA publishes the Daily Short Sale Volume File for trades reported to FINRA TRFs and the FINRA/Nasdaq ADF on a T+1 basis. The headline figure is the count of shares that printed at the short-sale or short-exempt tick across all reporting venues for the symbol; each exchange separately publishes its own daily short-sale data file.
- What does TMDX short volume tell options traders?
- Daily short-sale flow is one input that helps disambiguate dealer-hedging activity from directional bear flow when the chain shows fresh customer call inventory. It is not a clean MM-only proxy: the headline number mixes directional shorting, options-MM delta-hedging, ETF-creation arbitrage, and convertible-arb hedging. Cross-check against gamma-exposure and OI changes for a cleaner read.