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: May 21, 2027
Days to expiration: 223
Share price: $264.50
Put/call ratio (OI): 0.71
Put/call ratio (volume): 0.55
ATM implied volatility: 60.1%
Expected move: ±$124.27
Open interest (C / P): 413 / 295

MKSI options summary

The MKSI options chain for the May 21, 2027 expiration lists 34 call and 13 put contracts, with 223 days until expiration. Open interest stands at 413 calls and 295 puts, a put/call ratio of 0.71, which is fairly balanced between calls and puts. At-the-money implied volatility near the $260.00 strike is 60.1%, which implies the market expects a move of about ±$124.27 (47.0%) in MKS stock by expiration.

The most open interest sits at the $600.00 call (100 contracts) and the $220.00 put (244 contracts).

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

MKSI options chain · May 21, 2027

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
—	—	—	—	—	—	125.00	0.90	4.30	2.99	63.9%	—	10
2	1	66.2%	205.66	136.20	140.10	130.00	1.70	4.70	3.50	64.1%	10	10
22	20	74.0%	104.82	134.20	137.70	135.00	2.20	5.10	5.60	63.2%	—	2
1	—	66.6%	192.43	127.80	131.70	140.00	—	—	—	—	—	—
1	1	66.4%	165.00	119.60	123.50	150.00	—	—	—	—	—	—
—	—	—	—	—	—	160.00	0.00	0.00	11.70	12.5%	1	0
0	—	—	177.01	0.00	0.00	170.00	—	—	—	—	—	—
5	—	87.9%	209.45	108.70	112.60	180.00	—	—	—	—	—	—
1	1	65.7%	142.00	90.30	94.20	190.00	—	—	—	—	—	—
1	1	65.4%	135.50	83.80	87.70	200.00	—	—	—	—	—	—
—	—	—	—	—	—	210.00	17.10	20.80	25.50	55.4%	—	4
4	—	62.1%	72.70	70.20	73.70	220.00	20.30	24.50	26.15	54.6%	20	244
4	—	61.5%	67.90	64.40	67.90	230.00	24.60	28.50	28.96	54.4%	1	5
4	—	61.2%	68.60	58.90	62.90	240.00	28.90	33.00	47.05	53.9%	1	13
23	7	61.1%	53.40	54.40	57.90	250.00	—	—	—	—	—	—
40	—	60.1%	54.00	49.00	53.00	260.00	—	—	—	—	—	—
MKSI $264.50
36	1	60.0%	47.00	45.30	48.40	270.00	44.30	48.50	61.35	52.7%	—	1
12	1	59.5%	41.00	40.80	44.50	280.00	50.10	54.00	67.95	52.0%	1	2
85	1	59.6%	41.26	37.60	41.00	290.00	—	—	—	—	—	—
17	1	58.9%	39.70	33.50	37.50	300.00	63.00	67.00	81.20	51.6%	1	4
11	10	58.8%	41.30	30.40	34.50	310.00	—	—	—	—	—	—
17	2	58.5%	39.90	27.60	31.50	320.00	—	—	—	—	—	—
1	1	152.5%	107.00	96.50	100.50	350.00	—	—	—	—	—	—
1	1	143.9%	131.00	88.10	91.40	360.00	—	—	—	—	—	—
15	4	57.7%	16.80	12.00	16.10	400.00	0.00	0.00	119.22	—	—	0
0	—	12.5%	58.20	0.00	0.00	420.00	—	—	—	—	—	—
0	—	12.5%	41.58	0.00	0.00	430.00	—	—	—	—	—	—
0	1	58.4%	21.49	8.00	12.40	440.00	—	—	—	—	—	—
1	1	58.9%	12.26	5.60	9.20	480.00	—	—	—	—	—	—
0	—	12.5%	19.80	0.00	0.00	490.00	—	—	—	—	—	—
0	6	12.5%	18.70	0.00	0.00	500.00	—	—	—	—	—	—
3	1	59.9%	8.70	3.90	7.40	520.00	—	—	—	—	—	—
1	—	60.0%	7.80	3.20	6.50	540.00	—	—	—	—	—	—
1	—	61.0%	4.90	2.90	6.00	560.00	—	—	—	—	—	—
1	—	61.1%	4.30	2.20	5.50	580.00	—	—	—	—	—	—
100	1	60.9%	3.20	1.55	4.90	600.00	333.70	337.70	342.30	56.9%	—	0
3	1	61.9%	4.30	1.15	4.90	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 May 21, 2027 expiration, the MKSI put/call ratio based on open interest is 0.71 (295 puts vs 413 calls), and 0.55 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 May 21, 2027 is about 60.1%, 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.