PRTA Short Volume
Prothena Corporation plc (PRTA) operates in the Healthcare sector, specifically the Biotechnology industry, with a market capitalization near $524.6M, listed on NASDAQ, employing roughly 67 people, carrying a beta of -0.32 to the broader market. Prothena Corporation plc, a late-stage clinical biotechnology company, focuses on discovery and development of novel therapies to treat diseases caused by protein dysregulation. Led by Gene Kinney, public since 2012-12-21.
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
- 2026-06-30
- Short Volume
- 50.4K
- Total Volume
- 71.0K
- Short %
- 71.05%
- 30-Day Avg Short %
- 63.60%
Showing 30 days of FINRA short volume data for Prothena Corporation plc.
Learn how short volume is reported and how to read the data →
Frequently asked PRTA short volume questions
- What is the daily PRTA short volume?
- As of Jun 30, 2026, Prothena Corporation plc (PRTA) short volume is 50.4K shares against 71.0K total reported volume, or 71.05% short-side. Short volume measures shares sold short during the day; it is flow, not inventory.
- How is PRTA 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 PRTA 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.