SIGA Technologies (SIGA) Options Chain
NASDAQ: SIGAHealth CareBiotechnology: Pharmaceutical PreparationsUSD
At close: Oct 9, 4:00 PM ET · Delayed 15 min
Expiration date
- Expiration
- Nov 20, 2026
- Days to expiration
- 40
- Share price
- $3.28
- Put/call ratio (OI)
- 0.38
- Put/call ratio (volume)
- 0.16
- ATM implied volatility
- 120.7%
- Expected move
- ±$1.31
- Open interest (C / P)
- 719 / 276
SIGA options summary
The SIGA options chain for the November 20, 2026 expiration lists 3 call and 3 put contracts, with 40 days until expiration. Open interest stands at 719 calls and 276 puts, a put/call ratio of 0.38, which is tilted bullish, with calls outnumbering puts. At-the-money implied volatility near the $3.00 strike is 120.7%, which implies the market expects a move of about ±$1.31 (40.0%) in SIGA Technologies stock by expiration.
The most open interest sits at the $5.00 call (511 contracts) and the $5.00 put (227 contracts).
Summary generated from market data by MetaCap's automated system. Methodology
SIGA options chain · November 20, 2026
| Calls | Puts | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Last | Bid | Ask | Strike | Bid | Ask | Last | |||||
| — | — | — | 3.00 | 0.00 | 0.75 | 0.10 | |||||
| 0.24 | 0.00 | 0.75 | 4.00 | 0.20 | 1.35 | 1.20 | |||||
| 0.08 | 0.00 | 0.10 | 5.00 | 0.00 | 2.35 | 1.15 | |||||
| 0.15 | 0.00 | 0.15 | 6.00 | — | — | — | |||||
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 SIGA put/call ratio?
For the November 20, 2026 expiration, the SIGA put/call ratio based on open interest is 0.38 (276 puts vs 719 calls), and 0.16 based on today's volume. A ratio above 1 means more puts than calls.
What is SIGA's implied volatility?
At-the-money implied volatility for SIGA options expiring November 20, 2026 is about 120.7%, an annualized estimate of how much the market expects SIGA Technologies stock to move.
How many SIGA option expiration dates are there?
SIGA has 5 listed expiration dates, from Oct 16, 2026 to Mar 19, 2027.
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.