Prothena (PRTA) Options Chain
NASDAQ: PRTAHealth CareBiotechnology: Pharmaceutical PreparationsUSD
At close: Oct 9, 4:00 PM ET · Delayed 15 min
Expiration date
- Expiration
- Jan 15, 2027
- Days to expiration
- 96
- Share price
- $8.84
- Put/call ratio (OI)
- 0.01
- Put/call ratio (volume)
- 0.05
- Expected move
- ±$2.85
- Open interest (C / P)
- 1.80K / 27
PRTA options summary
The PRTA options chain for the January 15, 2027 expiration lists 13 call and 7 put contracts, with 96 days until expiration. Open interest stands at 1,803 calls and 27 puts, a put/call ratio of 0.01, which is tilted bullish, with calls outnumbering puts. At-the-money implied volatility near the $9.00 strike is 62.9%, which implies the market expects a move of about ±$2.85 (32.3%) in Prothena stock by expiration.
The most open interest sits at the $15.00 call (1.36K contracts) and the $9.00 put (12 contracts).
Summary generated from market data by MetaCap's automated system. Methodology
PRTA options chain · January 15, 2027
| Calls | Puts | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Last | Bid | Ask | Strike | Bid | Ask | Last | |||||
| 5.15 | 2.50 | 7.00 | 5.00 | — | — | — | |||||
| 4.35 | 2.75 | 4.70 | 6.00 | — | — | — | |||||
| 2.92 | 0.05 | 4.90 | 7.00 | 0.00 | 0.00 | 0.73 | |||||
| 2.00 | 1.10 | 2.00 | 8.00 | 0.00 | 1.00 | 0.65 | |||||
| 1.05 | 0.00 | 2.00 | 9.00 | 0.00 | 2.60 | 1.05 | |||||
| 0.85 | 0.35 | 1.70 | 10.00 | 0.00 | 0.00 | 2.25 | |||||
| 0.40 | 0.15 | 0.55 | 11.00 | 0.70 | 4.00 | 2.25 | |||||
| 1.58 | 0.65 | 4.70 | 12.00 | 1.80 | 5.50 | 3.04 | |||||
| 0.85 | 0.00 | 3.00 | 13.00 | — | — | — | |||||
| 0.55 | 0.00 | 2.80 | 14.00 | — | — | — | |||||
| 0.18 | 0.00 | 0.90 | 15.00 | — | — | — | |||||
| 1.70 | 0.05 | 5.00 | 17.00 | — | — | — | |||||
| 1.00 | 0.00 | 5.00 | 20.00 | 9.00 | 13.70 | 11.76 | |||||
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 January 15, 2027 expiration, the PRTA put/call ratio based on open interest is 0.01 (27 puts vs 1,803 calls), and 0.05 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 January 15, 2027 is about 62.9%, 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.