Prothena (PRTA) Options Chain
NASDAQ: PRTAHealth CareBiotechnology: Pharmaceutical PreparationsUSD
At close: Oct 9, 4:00 PM ET · Delayed 15 min
Expiration date
- Expiration
- Mar 19, 2027
- Days to expiration
- 159
- Share price
- $8.84
- Put/call ratio (OI)
- 0.22
- Put/call ratio (volume)
- 0.02
- Expected move
- ±$4.30
- Open interest (C / P)
- 162 / 35
PRTA options summary
The PRTA options chain for the March 19, 2027 expiration lists 5 call and 1 put contracts, with 159 days until expiration. Open interest stands at 162 calls and 35 puts, a put/call ratio of 0.22, which is tilted bullish, with calls outnumbering puts. At-the-money implied volatility near the $9.00 strike is 73.7%, which implies the market expects a move of about ±$4.30 (48.7%) in Prothena stock by expiration.
The most open interest sits at the $8.00 call (116 contracts) and the $9.00 put (35 contracts).
Summary generated from market data by MetaCap's automated system. Methodology
PRTA options chain · March 19, 2027
| Calls | Puts | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Last | Bid | Ask | Strike | Bid | Ask | Last | |||||
| 2.15 | 1.65 | 3.90 | 8.00 | — | — | — | |||||
| — | — | — | 9.00 | 0.00 | 1.80 | 1.70 | |||||
| 1.40 | 0.00 | 2.55 | 10.00 | — | — | — | |||||
| 1.15 | 0.00 | 0.00 | 11.00 | — | — | — | |||||
| 1.30 | 0.00 | 2.10 | 12.00 | — | — | — | |||||
| 0.60 | 0.00 | 1.90 | 13.00 | — | — | — | |||||
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 March 19, 2027 expiration, the PRTA put/call ratio based on open interest is 0.22 (35 puts vs 162 calls), and 0.02 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 March 19, 2027 is about 73.7%, 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.