Antero Midstream (AM) Options Chain

NYSE: AMUtilitiesNatural Gas DistributionUSD

21.09-0.10 (-0.47%)

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

Expiration date

Expiration: Nov 20, 2026
Days to expiration: 40
Share price: $21.09
Put/call ratio (OI): 0.60
Put/call ratio (volume): 4.90
ATM implied volatility: 32.9%
Expected move: ±$2.29
Open interest (C / P): 634 / 379

AM options summary

The AM options chain for the November 20, 2026 expiration lists 6 call and 6 put contracts, with 40 days until expiration. Open interest stands at 634 calls and 379 puts, a put/call ratio of 0.60, which is tilted bullish, with calls outnumbering puts. At-the-money implied volatility near the $21.00 strike is 32.9%, which implies the market expects a move of about ±$2.29 (10.9%) in Antero Midstream stock by expiration.

The most open interest sits at the $23.00 call (322 contracts) and the $21.00 put (119 contracts).

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

AM options chain · November 20, 2026

AM 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
—	—	—	—	—	—	17.00	0.00	0.35	0.15	52.3%	—	45
—	—	—	—	—	—	18.00	0.05	0.10	0.15	35.5%	4	43
—	—	—	—	—	—	19.00	0.05	0.30	0.25	38.2%	25	69
7	—	42.8%	0.75	1.10	1.80	20.00	0.25	0.50	0.45	34.5%	2	37
44	3	32.1%	0.69	0.50	0.95	21.00	0.45	0.90	1.04	33.6%	70	119
AM $21.09
253	4	26.8%	0.34	0.25	0.40	22.00	0.95	1.70	1.45	41.4%	2	66
322	10	30.6%	0.20	0.05	0.25	23.00	—	—	—	—	—	—
6	2	39.0%	0.19	0.00	0.25	24.00	—	—	—	—	—	—
2	2	36.1%	0.03	0.00	0.10	25.00	—	—	—	—	—	—

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 AM put/call ratio?

For the November 20, 2026 expiration, the AM put/call ratio based on open interest is 0.60 (379 puts vs 634 calls), and 4.90 based on today's volume. A ratio above 1 means more puts than calls.

What is AM's implied volatility?

At-the-money implied volatility for AM options expiring November 20, 2026 is about 32.9%, an annualized estimate of how much the market expects Antero Midstream stock to move.

How many AM option expiration dates are there?

AM has 7 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.