MKS (MKSI) Options Chain

NASDAQ: MKSIIndustrialsIndustrial Machinery/ComponentsUSD

264.50+4.12 (+1.58%)

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

Expiration date

Expiration: Dec 18, 2026
Days to expiration: 68
Share price: $264.50
Put/call ratio (OI): 0.39
Put/call ratio (volume): 1.40
ATM implied volatility: 56.5%
Expected move: ±$64.45
Open interest (C / P): 2.46K / 951

MKSI options summary

The MKSI options chain for the December 18, 2026 expiration lists 49 call and 35 put contracts, with 68 days until expiration. Open interest stands at 2,457 calls and 951 puts, a put/call ratio of 0.39, which is tilted bullish, with calls outnumbering puts. At-the-money implied volatility near the $260.00 strike is 56.5%, which implies the market expects a move of about ±$64.45 (24.4%) in MKS stock by expiration.

The most open interest sits at the $340.00 call (823 contracts) and the $270.00 put (363 contracts).

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

MKSI options chain · December 18, 2026

MKSI 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
2	1	89.4%	153.00	133.50	137.40	130.00	—	—	—	—	—	—
0	8	—	176.20	0.00	0.00	135.00	0.00	2.45	0.87	89.3%	1	1
0	1	—	169.00	0.00	0.00	140.00	0.00	2.55	1.25	85.7%	10	11
1	—	71.2%	152.00	116.50	120.10	145.00	—	—	—	—	—	—
2	—	74.0%	147.70	111.70	115.50	150.00	0.00	2.75	1.39	78.8%	1	6
1	—	77.3%	143.60	107.20	111.10	155.00	0.10	2.90	1.90	76.3%	3	4
1	1	77.9%	138.50	102.60	106.60	160.00	0.00	3.10	1.45	72.9%	1	2
0	—	—	146.00	0.00	0.00	165.00	1.50	4.40	9.00	80.4%	—	1
1	—	117.8%	185.50	104.10	107.80	170.00	0.00	3.60	7.00	67.6%	1	18
0	—	—	155.10	0.00	0.00	180.00	2.75	7.00	9.30	78.9%	1	1
0	—	—	120.50	0.00	0.00	185.00	0.65	4.70	2.10	62.8%	2	3
50	—	65.0%	67.70	76.60	79.90	190.00	1.50	4.80	4.04	61.8%	1	5
0	—	—	128.80	0.00	0.00	195.00	1.60	5.70	7.00	60.6%	51	55
2	1	64.8%	83.50	68.20	71.70	200.00	2.25	6.40	9.60	60.0%	1	5
0	—	—	116.40	0.00	0.00	210.00	3.90	8.20	7.66	59.0%	1	28
4	1	61.7%	54.15	52.00	55.80	220.00	6.10	10.30	16.90	58.0%	3	5
2	1	60.3%	42.25	44.70	48.50	230.00	0.00	0.00	17.89	6.3%	8	0
12	1	59.7%	38.77	38.70	41.50	240.00	12.00	16.30	16.04	56.1%	1	109
34	2	58.2%	32.80	32.10	35.50	250.00	16.80	19.70	23.20	55.8%	5	18
83	1	57.5%	35.90	26.50	30.30	260.00	21.60	24.30	17.50	55.4%	8	17
MKSI $264.50
122	1	58.1%	35.40	22.40	26.00	270.00	26.30	30.20	22.60	54.9%	5	363
160	6	58.2%	19.06	18.90	21.80	280.00	32.00	35.40	40.10	53.5%	7	94
152	3	57.2%	26.46	15.20	17.90	290.00	38.90	42.30	31.81	54.0%	3	18
44	4	56.7%	12.90	11.90	15.00	300.00	46.00	49.00	39.41	53.3%	1	60
8	1	57.1%	14.43	9.00	13.40	310.00	53.70	56.50	53.20	53.1%	1	11
69	1	58.5%	9.40	8.20	11.20	320.00	61.50	65.00	80.76	53.3%	1	96
23	1	57.4%	10.70	5.40	9.70	330.00	0.00	0.00	71.55	—	—	0
823	1	57.1%	6.45	5.30	6.80	340.00	0.00	0.00	78.33	—	5	0
21	2	57.5%	7.90	2.90	7.10	350.00	87.50	91.00	97.49	52.9%	1	7
4	1	58.4%	4.70	2.20	6.30	360.00	102.70	106.30	83.80	74.4%	20	6
25	1	57.9%	7.31	1.45	5.20	370.00	—	—	—	—	—	—
79	7	58.1%	2.62	0.80	4.60	380.00	0.00	0.00	110.01	—	5	0
3	3	60.6%	2.50	1.35	3.90	390.00	0.00	0.00	109.55	—	1	0
42	20	62.9%	3.44	1.25	3.80	400.00	0.00	0.00	117.27	—	1	0
52	1	64.0%	2.15	0.50	4.00	410.00	143.50	147.40	89.70	61.9%	—	6
4	1	64.0%	2.65	0.10	3.60	420.00	158.90	162.20	144.22	80.7%	—	1
82	1	65.4%	1.73	0.00	3.40	430.00	—	—	—	—	—	—
4	6	88.8%	56.50	4.20	7.20	440.00	—	—	—	—	—	—
23	5	69.2%	2.15	0.10	3.10	450.00	—	—	—	—	—	—
11	3	70.1%	4.90	0.00	2.90	460.00	—	—	—	—	—	—
0	1	25.0%	19.10	0.00	0.00	470.00	—	—	—	—	—	—
503	1	75.1%	1.80	0.00	2.65	490.00	—	—	—	—	—	—
0	10	25.0%	8.00	0.00	0.00	500.00	233.60	237.70	228.00	57.6%	—	0
2	1	79.9%	0.75	0.00	2.50	520.00	—	—	—	—	—	—
0	1	25.0%	10.70	0.00	0.00	540.00	—	—	—	—	—	—
0	1	25.0%	2.80	0.00	0.00	560.00	—	—	—	—	—	—
0	1	25.0%	7.70	0.00	0.00	580.00	—	—	—	—	—	—
2	2	91.8%	0.15	0.00	2.30	600.00	337.70	341.60	307.10	115.2%	—	0
4	2	94.6%	0.21	0.00	2.30	620.00	—	—	—	—	—	—

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 MKSI put/call ratio?

For the December 18, 2026 expiration, the MKSI put/call ratio based on open interest is 0.39 (951 puts vs 2,457 calls), and 1.40 based on today's volume. A ratio above 1 means more puts than calls.

What is MKSI's implied volatility?

At-the-money implied volatility for MKSI options expiring December 18, 2026 is about 56.5%, an annualized estimate of how much the market expects MKS stock to move.

How many MKSI option expiration dates are there?

MKSI has 9 listed expiration dates, from Oct 16, 2026 to Nov 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.