Prothena Corporation plc (PRTA) IV/HV History
Comparing implied volatility to historical (realized) volatility reveals whether options are priced rich or cheap relative to actual price movement. Persistent gaps can signal trading opportunities.
Prothena Corporation plc (PRTA) operates in the Healthcare sector, specifically the Biotechnology industry, with a market capitalization near $502.6M, listed on NASDAQ, employing roughly 163 people, carrying a beta of -0.23 to the broader market. Prothena Corporation plc, a late-stage clinical company, focuses on discovery and development of novel therapies for life-threatening diseases in the United States. Led by Gene G. Kinney, public since 2012-12-18.
Snapshot as of May 15, 2026.
- Spot Price
- $9.80
- ATM IV
- 81.1%
- HV 20-Day
- 63.7%
- HV 60-Day
- 51.1%
- IV Rank
- 14.3%
- IV Percentile
- 64.3%
As of May 15, 2026, Prothena Corporation plc (PRTA) ATM implied volatility is 81.1%. 20-day realized volatility is 63.7%, producing an IV-HV spread of +17.4 vol points. Options are pricing in more volatility than the stock has recently delivered, the volatility risk premium. IV rank is 14.3%.
How PRTA iv/hv history Data Feeds Strategy Selection
Strategy selection on Prothena Corporation plc options does not derive from any single metric in isolation. The iv/hv history view above sits inside a broader read: ATM IV currently sits at 81.1% and dealer gamma exposure is positive, so dealer hedging is mechanically mean-reverting. Combine the iv/hv history data here with the volatility-skew surface, dealer-gamma exposure, max-pain level, and upcoming-events calendar to build a positioning thesis. Risk-defined structures (credit spreads, debit spreads, iron condors) are usually safer than naked positions while the regime is uncertain; the data on this page anchors the inputs but does not by itself constitute a trade thesis.
Learn how implied vs realized volatility is reported and how to read the data →
Frequently asked PRTA iv/hv history questions
- Is PRTA options pricing rich or cheap right now?
- As of May 15, 2026, Prothena Corporation plc (PRTA) ATM IV is 81.1% against 20-day realized volatility of 63.7%. IV rank is 14.3%. PRTA options are pricing in more volatility than the stock has recently realized: a positive variance risk premium worth 17.4 vol points.
- What is the PRTA variance risk premium?
- The variance risk premium is the persistent gap between implied and subsequently realized volatility. In equity markets it averages positive because option sellers demand compensation for bearing variance shocks. PRTA is currently priced consistently with this premium, which is one input to whether short-vol or long-vol structures carry their typical edge.
- What does PRTA IV rank mean for strategy selection?
- IV rank normalizes the current ATM IV to its 1-year range: 0% is the low, 100% is the high. PRTA's current rank of 14.3% signals where current pricing sits in its own 1-year history. High-rank regimes typically favor premium-selling structures (credit spreads, condors, covered calls); low-rank regimes typically favor premium-buying or long-volatility structures.