GRMN Options Chain Analysis

As of previous close (2026-10-21) · OPRA historical data

Spot $291.13 at that close. Nothing on this page comes from the session in progress.

Put/Call (OI)

0.71

4k P / 6k C

Put/Call (Volume)

2.28

82 P / 36 C that session

30d ATM IV

44%

annualized implied move

Call wall

$320

534 contracts

Put wall

$250

2k contracts

Tail hedging

3.4×

deep-OTM puts vs calls

What the positioning says

●Call wall at $320 (534 contracts), 10% above spot — the upside strike the crowd is already parked on; often acts as near-term resistance.
●Put wall at $250 (2k contracts), 14% below spot — the hedge floor; often acts as support.
●Deep-OTM put open interest is 3.4× deep-OTM call OI — an institutional hedging ladder sits under this stock.

Open interest by strike

All expiries combined. Amber lines mark the call and put walls; the dashed line is spot.

IV term structure

At-the-money implied volatility per expiry.

Volatility smile

IV by strike — expiry 2026-11-20. A steep left side = expensive downside protection.

Open interest by expiry

Expiry	Call OI	Put OI	P/C	Volume that session
2026-11-20	493	2k	4.43	55
2026-12-18	3k	902	0.35	15
2027-01-15	809	575	0.71	7
2027-02-19	63	53	0.84	0
2027-04-16	39	37	0.95	2
2027-05-21	103	160	1.55	0
2027-08-20	218	113	0.52	5
2027-11-19	1k	129	0.09	34

Source: Cboe end-of-session option chains, summarized after each US market close and published from the following trading day — OPRA historical data. Under the OPRA plan options data becomes historical, and freely publishable, at the opening of the next trading session; data from the session in progress is never displayed or served here. Open interest is exchange-reported once a day. Research, not investment advice.