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: Oct 16, 2026
Days to expiration: 7
Share price: $2.61
Put/call ratio (OI): 0.10
Put/call ratio (volume): 0.09
ATM implied volatility: 246.9%
Expected move: ±$0.8923
Open interest (C / P): 4.69K / 464

ALT options summary

The ALT options chain for the October 16, 2026 expiration lists 11 call and 8 put contracts, with 7 days until expiration. Open interest stands at 4,690 calls and 464 puts, a put/call ratio of 0.10, which is tilted bullish, with calls outnumbering puts. At-the-money implied volatility near the $2.50 strike is 246.9%, which implies the market expects a move of about ±$0.8923 (34.2%) in Altimmune stock by expiration.

The most open interest sits at the $3.00 call (2.41K contracts) and the $3.00 put (439 contracts).

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

ALT options chain · October 16, 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
210	2	1150.0%	2.09	2.05	2.40	0.50	—	—	—	—	—	—
23	3	1012.5%	1.67	1.30	1.90	1.00	—	—	—	—	—	—
25	20	787.5%	1.98	0.70	1.50	1.50	—	—	—	—	—	—
1	2	434.4%	1.13	0.30	0.90	2.00	—	—	—	—	—	—
304	70	407.8%	0.15	0.05	1.20	2.50	0.00	0.15	0.05	85.9%	2	10
ALT $2.61
2,412	10	92.2%	0.03	0.00	0.05	3.00	0.10	0.70	0.45	71.9%	1	439
1,064	1	153.1%	0.03	0.00	0.05	3.50	0.75	1.20	0.90	223.4%	1	7
648	5	203.1%	0.04	0.00	0.05	4.00	1.10	1.75	1.31	218.8%	1	2
0	3	50.0%	0.10	0.00	0.00	4.50	1.55	2.30	1.91	259.4%	1	4
3	—	275.0%	0.10	0.00	0.05	5.00	2.05	2.75	2.35	237.5%	1	2
—	—	—	—	—	—	5.50	2.30	3.50	2.80	262.5%	2	0
0	—	50.0%	0.06	0.00	0.00	6.00	2.80	4.00	3.42	287.5%	1	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 October 16, 2026 expiration, the ALT put/call ratio based on open interest is 0.10 (464 puts vs 4,690 calls), and 0.09 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 October 16, 2026 is about 246.9%, 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.