Sandisk Corporation (SNDK)
Sandisk Corporation · SNDK · data through 2026-10-16 · free to read
SNDK unusual options activity and options flow
What is the options flow saying about SNDK?
On 2026-10-16, Sandisk Corporation (SNDK) traded $249.2M of call premium against $575.8M of put premium, 30% of it on the call side. The tape leans puts. Volume and open interest below, updated after each close.
The session's options tape
How much open interest is standing
Across 51 sessions to 2026-10-16, SNDK carries 18k of call open interest against 37k of puts, a put/call ratio of 2.07. Open interest is what is still on the book, as opposed to what changed hands today.
Where the premium has gone over three months
From 2026-07-21 to 2026-10-16, cumulative call premium reached $45.2B against $39.7B on puts, a net of +$5.5B. One day's flow is noise; the cumulative line is where a lean shows up.
SNDK gamma exposure
Where is dealer gamma on SNDK?
As of 2026-10-16, dealer gamma on Sandisk Corporation (SNDK) is negative, so dealer hedging amplifies moves. The sign has flipped 5 times over the window shown. A flip matters more than the level: it changes whether hedging flow works with the move or against it.
What dealer gamma has done
Total dealer gamma exposure on SNDK over 51 sessions, 2026-05-08 to 2026-10-16. The sign flipped 5 times in that window.
When dealer gamma is positive, hedging leans against the move and tends to compress the range. When it is negative, hedging runs with the move and tends to extend it. The flip is the event worth watching, not the level.
SNDK congress trades
Which members of Congress have traded SNDK?
5 members of Congress disclosed 10 transactions in Sandisk Corporation (SNDK), 4 of them purchases. The most recent was filed 2026-06-03. Disclosures lag the trade by up to 45 days by law.
| Member | Chamber | Side | Traded | Disclosed | Size |
|---|---|---|---|---|---|
| Josh Gottheimer | House · NJ05 | BUY | 2026-05-07 | 2026-06-03 | $1001–$15000 |
| Gilbert Cisneros | House · CA31 | BUY | 2026-03-13 | 2026-04-07 | $1001–$15000 |
| Gilbert Cisneros | House · CA31 | BUY | 2026-01-09 | 2026-02-13 | $1001–$15000 |
| Lisa McClain | House · MI09 | SELL | 2025-10-31 | 2025-11-21 | $1001–$15000 |
| Lisa McClain | House · MI09 | SELL | 2025-10-30 | 2025-11-21 | $1001–$15000 |
| Lisa McClain | House · MI09 | BUY | 2025-10-30 | 2025-11-21 | $1001–$15000 |
| Rob Bresnahan | House · PA08 | SELL | 2025-04-08 | 2025-05-08 | $1001–$15000 |
| Jefferson Shreve | House · IN06 | SELL | 2025-04-07 | 2025-05-08 | $15001–$50000 |
| Rob Bresnahan | House · PA08 | SELL | 2025-04-04 | 2025-04-22 | $1001–$15000 |
| Jefferson Shreve | House · IN06 | EXCHANGE | 2025-02-24 | 2025-03-09 | $1001–$15000 |
Members must file within 45 days of a transaction, so a disclosure date well after the trade date is normal rather than suspicious. Sizes are reported as brackets, never as exact amounts.
Common questions about SNDK
What does the options flow on SNDK actually mean?
It is the money that changed hands in SNDK options on 2026-10-16: $249.2M paid for calls, $575.8M for puts. Premium is the better read than contract count, because a thousand cheap far-dated calls and one large near-dated block are not the same conviction, and only premium tells them apart.
Is heavy call buying in SNDK bullish?
Not by itself. 30% of SNDK's premium sat on the call side, and a good share of any day's call volume is someone hedging a short, closing a position, or a market maker managing inventory. Flow says where money went, never why. It is one input among several, which is how it is weighted on the desk.
What is the difference between volume and open interest on SNDK?
Volume is what traded today: 143210 calls and 124871 puts. Open interest is what is still on the book afterwards, currently 18k of calls against 37k of puts. Volume can spike and vanish the same day; open interest rising means positions were opened rather than closed.
What is dealer gamma exposure on SNDK?
It is the aggregate gamma the market makers who sold SNDK options are carrying. It matters because they hedge it, and that hedging is real buying and selling in the stock. As of 2026-10-16 it is negative.
What happens when SNDK gamma is positive versus negative?
Positive gamma means dealers sell into strength and buy weakness, which compresses the range and makes moves fade. Negative gamma means they do the opposite, selling weakness and buying strength, which extends moves. Same stock, opposite character, depending only on which side dealers are on.
Why do the sign flips matter more than the level?
Because the flip is when the behaviour changes. SNDK has flipped 5 times across the window shown here. A large positive number tells you little on its own; crossing zero tells you hedging flow just switched from working against the move to working with it.
Which members of Congress have traded SNDK?
5 distinct members appear in the disclosures for Sandisk Corporation, across 10 transactions, 4 of them purchases. The table above names each one with their chamber, the trade date and the date it was disclosed.
Why is there a gap between the trade date and the disclosure date on SNDK?
The STOCK Act gives members up to 45 days to file. The most recent SNDK entry here was traded 2026-05-07 and disclosed 2026-06-03. That lag is the law working as written, not evidence of anything, and it is the main reason this data is context rather than a signal.
Why are the amounts shown as ranges?
Because that is how they are filed. Members report a bracket, such as $1,001 to $15,000, never an exact figure. Anyone quoting a precise dollar amount for a congressional trade is estimating from the bracket.
More on SNDK
These are the facts. The desk is the opinion.
Every night the app reads the whole US market and ranks the names worth trading, each with a plain-English read on why and the levels that matter. This page is free; that shortlist is what members pay for.
See how a pick is madeEducational research, not investment advice. Figures come from end-of-day data and are shown as reported.