SEM Short Volume
Select Medical Holdings Corporation (SEM) operates in the Healthcare sector, specifically the Medical - Care Facilities industry, with a market capitalization near $2.04B, listed on NYSE, employing roughly 30,000 people, carrying a beta of 0.80 to the broader market. Select Medical Holdings Corporation, through its subsidiaries, operates critical illness recovery hospitals, rehabilitation hospitals, outpatient rehabilitation clinics, and occupational health centers in the United States. Led by Thomas Mullin, public since 2009-09-25.
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
- 2026-05-15
- Short Volume
- 134.4K
- Total Volume
- 337.6K
- Short %
- 39.80%
- 30-Day Avg Short %
- 33.74%
Showing 30 days of FINRA short volume data for Select Medical Holdings Corporation.
Learn how short volume is reported and how to read the data →
Frequently asked SEM short volume questions
- What is the daily SEM short volume?
- As of May 15, 2026, Select Medical Holdings Corporation (SEM) short volume is 134.4K shares against 337.6K total reported volume, or 39.80% short-side. Short volume measures shares sold short during the day; it is flow, not inventory.
- How is SEM 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 SEM 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.