Merck (MRK) Options Chain

NYSE: MRKHealth CareBiotechnology: Pharmaceutical PreparationsUSD

145.60+3.22 (+2.26%)

At close: Oct 9, 4:02 PM ET · Delayed 15 min

Expiration date

Expiration: Nov 6, 2026
Days to expiration: 26
Share price: $145.60
Put/call ratio (OI): 0.46
Put/call ratio (volume): 0.26
ATM implied volatility: 46.5%
Expected move: ±$18.06
Open interest (C / P): 893 / 408

MRK options summary

The MRK options chain for the November 6, 2026 expiration lists 27 call and 18 put contracts, with 26 days until expiration. Open interest stands at 893 calls and 408 puts, a put/call ratio of 0.46, which is tilted bullish, with calls outnumbering puts. At-the-money implied volatility near the $146.00 strike is 46.5%, which implies the market expects a move of about ±$18.06 (12.4%) in Merck stock by expiration.

The most open interest sits at the $147.00 call (425 contracts) and the $130.00 put (100 contracts).

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

MRK options chain · November 6, 2026

MRK 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
—	—	—	—	—	—	110.00	0.00	0.25	0.16	50.1%	5	5
—	—	—	—	—	—	115.00	0.03	0.20	0.16	46.6%	88	0
1	1	55.6%	22.40	25.15	27.95	120.00	0.14	0.45	0.32	46.3%	2	89
—	—	—	—	—	—	125.00	—	—	1.10	—	—	—
—	—	—	—	—	—	130.00	0.75	1.40	1.38	42.8%	1	100
—	—	—	—	—	—	133.00	1.38	1.84	1.42	41.1%	15	8
1	—	50.8%	18.25	13.50	14.85	134.00	1.35	1.81	1.56	38.8%	26	28
—	—	—	—	—	—	135.00	1.63	2.12	1.80	39.4%	23	64
2	—	49.5%	13.75	11.80	13.30	136.00	1.98	2.47	2.09	40.0%	20	9
—	—	—	—	—	—	137.00	1.91	2.60	2.40	38.8%	2	47
2	—	47.7%	12.86	9.90	11.75	138.00	—	—	4.05	—	—	—
—	—	—	—	—	—	139.00	—	—	5.10	—	—	—
5	1	45.2%	8.47	8.90	10.15	140.00	3.00	3.45	3.12	37.6%	5	28
—	—	—	5.15	—	—	141.00	3.40	4.85	3.60	44.5%	1	13
—	—	—	4.60	—	—	142.00	—	—	5.69	—	—	—
27	1	43.6%	6.25	7.20	8.20	143.00	4.05	5.10	4.30	40.4%	80	11
24	16	44.7%	6.55	6.15	7.85	144.00	—	—	—	—	—	—
28	2	43.1%	6.25	6.10	7.10	145.00	—	—	8.48	—	—	—
MRK $145.60
3	1	46.5%	6.05	5.65	7.15	146.00	—	—	—	—	—	—
425	6	40.8%	3.40	5.15	5.80	147.00	—	—	—	—	—	—
15	8	40.7%	2.78	4.65	5.35	148.00	—	—	—	—	—	—
1	—	44.0%	6.75	4.35	5.45	149.00	—	—	—	—	—	—
71	5	40.6%	4.22	3.95	4.55	150.00	7.65	8.60	7.60	38.4%	—	6
7	76	41.1%	3.45	1.92	3.75	152.50	—	—	—	—	—	—
8	809	40.9%	2.76	2.50	2.99	155.00	—	—	—	—	—	—
89	54	39.7%	2.11	1.82	2.23	157.50	—	—	—	—	—	—
164	38	39.7%	1.55	1.31	1.74	160.00	—	—	—	—	—	—
3	10	40.6%	1.26	1.10	1.43	162.50	—	—	—	—	—	—
9	3	43.1%	1.01	0.40	1.33	165.00	—	—	—	—	—	—
1	1	53.0%	0.46	0.24	1.98	167.50	—	—	—	—	—	—
—	—	—	0.25	—	—	170.00	—	—	—	—	—	—
—	—	—	0.33	—	—	172.50	—	—	—	—	—	—
1	1	54.4%	0.71	0.07	2.34	175.00	—	—	—	—	—	—
5	5	59.0%	0.26	0.00	2.25	180.00	—	—	—	—	—	—
1	1	90.8%	0.04	0.00	2.13	215.00	—	—	—	—	—	—

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 MRK put/call ratio?

For the November 6, 2026 expiration, the MRK put/call ratio based on open interest is 0.46 (408 puts vs 893 calls), and 0.26 based on today's volume. A ratio above 1 means more puts than calls.

What is MRK's implied volatility?

At-the-money implied volatility for MRK options expiring November 6, 2026 is about 46.5%, an annualized estimate of how much the market expects Merck stock to move.

How many MRK option expiration dates are there?

MRK has 15 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.