Glaukos (GKOS) Options Chain

NYSE: GKOSHealth CareMedical/Dental InstrumentsUSD

165.69+4.40 (+2.73%)

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

Expiration date

Expiration: Nov 20, 2026
Days to expiration: 40
Share price: $165.69
Put/call ratio (OI): 6.75
Put/call ratio (volume): 16.79
ATM implied volatility: 67.3%
Expected move: ±$36.91
Open interest (C / P): 360 / 2.43K

GKOS options summary

The GKOS options chain for the November 20, 2026 expiration lists 16 call and 12 put contracts, with 40 days until expiration. Open interest stands at 360 calls and 2,429 puts, a put/call ratio of 6.75, which is more bearish, with puts outnumbering calls. At-the-money implied volatility near the $165.00 strike is 67.3%, which implies the market expects a move of about ±$36.91 (22.3%) in Glaukos stock by expiration.

The most open interest sits at the $180.00 call (234 contracts) and the $165.00 put (1.33K contracts).

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

GKOS options chain · November 20, 2026

GKOS 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
—	—	—	—	—	—	105.00	0.00	2.70	1.00	93.9%	—	5
—	—	—	—	—	—	110.00	0.00	2.95	1.15	87.9%	1	1
—	—	—	—	—	—	115.00	0.45	3.30	2.35	85.3%	2	7
—	—	—	—	—	—	120.00	0.75	3.60	1.85	80.9%	3	3
—	—	—	—	—	—	125.00	1.10	3.90	2.53	76.3%	1	12
—	—	—	—	—	—	130.00	1.65	4.30	3.60	72.6%	5	12
—	—	—	—	—	—	135.00	3.40	5.40	3.90	75.1%	3	13
1	—	70.8%	26.64	29.00	32.50	140.00	—	—	—	—	—	—
1	—	68.2%	26.89	25.40	28.20	145.00	5.80	7.10	6.61	70.1%	2	4
3	4	68.3%	16.40	22.30	24.80	150.00	6.70	9.30	9.20	69.0%	864	893
5	2	67.2%	18.60	18.90	21.80	155.00	9.40	11.20	11.81	70.4%	332	38
8	7	65.7%	12.30	16.10	18.50	160.00	11.50	12.90	13.80	68.5%	3	112
10	2	66.9%	13.70	13.60	16.60	165.00	13.90	15.30	16.10	67.7%	10	1,329
GKOS $165.69
11	4	64.5%	11.60	11.30	13.50	170.00	—	—	—	—	—	—
23	4	65.8%	9.70	9.20	12.30	175.00	—	—	—	—	—	—
234	33	65.5%	5.32	7.60	10.40	180.00	—	—	—	—	—	—
10	1	64.7%	5.30	4.70	7.60	190.00	—	—	—	—	—	—
19	1	62.8%	6.60	3.40	6.10	195.00	—	—	—	—	—	—
19	2	63.9%	2.40	1.90	3.50	210.00	—	—	—	—	—	—
1	1	64.7%	1.58	0.40	3.30	220.00	—	—	—	—	—	—
6	5	69.2%	1.15	0.00	3.20	230.00	—	—	—	—	—	—
6	4	64.8%	0.85	0.40	1.15	240.00	—	—	—	—	—	—
3	3	78.9%	0.70	0.10	2.65	250.00	—	—	—	—	—	—

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 GKOS put/call ratio?

For the November 20, 2026 expiration, the GKOS put/call ratio based on open interest is 6.75 (2,429 puts vs 360 calls), and 16.79 based on today's volume. A ratio above 1 means more puts than calls.

What is GKOS's implied volatility?

At-the-money implied volatility for GKOS options expiring November 20, 2026 is about 67.3%, an annualized estimate of how much the market expects Glaukos stock to move.

How many GKOS option expiration dates are there?

GKOS has 6 listed expiration dates, from Oct 16, 2026 to Dec 17, 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.