WST Options Chain Analysis

As of previous close (2026-10-02) · OPRA historical data

Spot $364.98 at that close. Nothing on this page comes from the session in progress.

Put/Call (OI)

0.76

2k P / 3k C

Put/Call (Volume)

0.27

22 P / 83 C that session

30d ATM IV

26%

annualized implied move

Call wall

$400

398 contracts

Put wall

$270

544 contracts

Tail hedging

4.5×

deep-OTM puts vs calls

What the positioning says

●Call wall at $400 (398 contracts), 10% above spot — the upside strike the crowd is already parked on; often acts as near-term resistance.
●Put wall at $270 (544 contracts), 26% below spot — the hedge floor; often acts as support.
●Deep-OTM put open interest is 4.5× 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 2026-10-16. A steep left side = expensive downside protection.

30-day implied volatility history

Daily ATM IV (~30 DTE bucket) collected since March 2026. Rising IV into an event = the market bracing; collapsing IV after = the crush.

Open interest by expiry

Expiry	Call OI	Put OI	P/C	Volume that session
2026-10-16	709	128	0.18	62
2026-11-20	108	45	0.42	24
2026-12-18	916	1k	1.35	4
2027-01-15	654	428	0.65	5
2027-03-19	47	43	0.91	8
2027-05-21	7	3	0.43	1
2027-12-17	270	179	0.66	1

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.