CSL Options Chain Analysis

As of previous close (2026-09-02) · OPRA historical data

Spot $340.22 at that close. Nothing on this page comes from the session in progress.

Put/Call (OI)

1.18

908 P / 769 C

Put/Call (Volume)

2.50

5 P / 2 C that session

30d ATM IV

37%

annualized implied move

Call wall

$380

214 contracts

Put wall

$280

242 contracts

Tail hedging

0.7×

deep-OTM puts vs calls

What the positioning says

●Defensive positioning: 1.18 puts outstanding per call — holders are hedging rather than selling.
●Call wall at $380 (214 contracts), 12% above spot — the upside strike the crowd is already parked on; often acts as near-term resistance.
●Put wall at $280 (242 contracts), 18% below spot — the hedge floor; often acts as support.

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 2026-09-18. 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	3	7	2.33	0
2026-12-18	304	382	1.26	0
2027-03-19	16	28	1.75	2

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.