Prothena (PRTA) Options Chain
NASDAQ: PRTAHealth CareBiotechnology: Pharmaceutical PreparationsUSD
Market open · Delayed 15 min · as of Oct 8, 2:38 PM ET
Expiration date
- Expiration
- Oct 16, 2026
- Days to expiration
- 8
- Share price
- $8.72
- Put/call ratio (OI)
- 0.00
- Put/call ratio (volume)
- 0.00
- Expected move
- ±$0.6859
- Open interest (C / P)
- 253 / 0
PRTA options summary
The PRTA options chain for the October 16, 2026 expiration lists 5 call and 0 put contracts, with 8 days until expiration. Open interest stands at 253 calls and 0 puts, a put/call ratio of 0.00, which is tilted bullish, with calls outnumbering puts. At-the-money implied volatility near the $9.00 strike is 53.1%, which implies the market expects a move of about ±$0.6859 (7.9%) in Prothena stock by expiration.
Summary generated from market data by MetaCap's automated system. Methodology
PRTA options chain · October 16, 2026
| Calls | Puts | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Last | Bid | Ask | Strike | Bid | Ask | Last | |||||
| 1.64 | 0.05 | 1.85 | 7.00 | — | — | — | |||||
| 0.90 | 0.75 | 1.10 | 8.00 | — | — | — | |||||
| 0.12 | 0.10 | 0.25 | 9.00 | — | — | — | |||||
| 0.05 | 0.00 | 0.20 | 10.00 | — | — | — | |||||
| 0.05 | 0.00 | 0.20 | 11.00 | — | — | — | |||||
In-the-money callsIn-the-money puts. IV = implied volatility, OI = open interest (contracts). Each contract covers 100 shares. Quotes delayed at least 15 minutes.
Frequently asked questions
What is the PRTA put/call ratio?
For the October 16, 2026 expiration, the PRTA put/call ratio based on open interest is 0.00 (0 puts vs 253 calls), and 0.00 based on today's volume. A ratio above 1 means more puts than calls.
What is PRTA's implied volatility?
At-the-money implied volatility for PRTA options expiring October 16, 2026 is about 53.1%, an annualized estimate of how much the market expects Prothena stock to move.
How many PRTA option expiration dates are there?
PRTA has 6 listed expiration dates, from Oct 16, 2026 to Jan 21, 2028.
What does "in the money" mean?
A call is in the money when the strike price is below the current share price; a put is in the money when the strike is above it. In-the-money contracts have intrinsic value and are shaded in the table.