Altimmune (ALT) Options Chain

NASDAQ: ALTHealth CareBiotechnology: Pharmaceutical PreparationsUSD

2.61+0.01 (+0.38%)

At close: Oct 9, 4:00 PM ET · Delayed 15 min

Expiration date

Expiration: Dec 18, 2026
Days to expiration: 68
Share price: $2.61
Put/call ratio (OI): 1.13
Put/call ratio (volume): 8.03
ATM implied volatility: 128.7%
Expected move: ±$1.45
Open interest (C / P): 8.10K / 9.11K

ALT options summary

The ALT options chain for the December 18, 2026 expiration lists 12 call and 9 put contracts, with 68 days until expiration. Open interest stands at 8,100 calls and 9,114 puts, a put/call ratio of 1.13, which is fairly balanced between calls and puts. At-the-money implied volatility near the $2.50 strike is 128.7%, which implies the market expects a move of about ±$1.45 (55.6%) in Altimmune stock by expiration.

The most open interest sits at the $4.00 call (3.67K contracts) and the $3.00 put (6.80K contracts).

Summary generated from market data by MetaCap's automated system. Methodology

ALT options chain · December 18, 2026

ALT calls and puts by strike price. Shaded cells are in the money.
Calls							Puts
OI	Vol	IV	Last	Bid	Ask	Strike	Bid	Ask	Last	IV	Vol	OI
57	11	395.3%	2.83	0.20	4.30	0.50	0.00	0.00	0.20	50.0%	—	0
4	1	128.1%	2.25	1.25	2.00	1.00	—	—	—	—	—	—
15	19	114.8%	1.81	0.80	1.55	1.50	0.00	0.75	0.05	244.5%	—	5
55	4	232.8%	0.70	0.40	2.05	2.00	0.00	0.75	0.05	162.9%	15	79
49	10	83.2%	0.69	0.05	0.80	2.50	0.10	1.30	0.25	174.2%	2,011	2,100
ALT $2.61
820	3	86.3%	0.15	0.15	0.35	3.00	0.25	1.25	0.55	110.5%	10	6,799
1,067	3	82.4%	0.11	0.05	0.20	3.50	0.70	1.35	0.71	85.2%	3	64
3,671	31	94.1%	0.06	0.05	0.15	4.00	1.10	1.80	0.79	80.5%	1	57
244	4	138.3%	0.05	0.00	0.40	4.50	—	—	—	—	—	—
1,546	2	87.5%	0.03	0.00	0.05	5.00	2.00	2.90	2.05	106.3%	10	10
124	1	171.5%	0.05	0.00	0.45	5.50	—	—	—	—	—	—
448	167	220.3%	0.12	0.00	0.75	6.00	2.90	4.00	2.90	126.6%	6	0

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 ALT put/call ratio?

For the December 18, 2026 expiration, the ALT put/call ratio based on open interest is 1.13 (9,114 puts vs 8,100 calls), and 8.03 based on today's volume. A ratio above 1 means more puts than calls.

What is ALT's implied volatility?

At-the-money implied volatility for ALT options expiring December 18, 2026 is about 128.7%, an annualized estimate of how much the market expects Altimmune stock to move.

How many ALT option expiration dates are there?

ALT has 11 listed expiration dates, from Oct 16, 2026 to Jan 19, 2029.

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.