Most unusual-options prints are noise. This one was not.
At 12:10:42 on March 11, 2026, with SanDisk (SNDK) trading around $655, our Unusual Options Activity scanner flagged a single print on a line almost nobody was trading: 1,000 January-2027 750-strike calls, paid at roughly $175 a contract — about $17 million in premium.
The scanner's volume z-score on that contract was 27.3. That is not a typo. Twenty-seven standard deviations above the line's normal activity, against an open interest that supported a volume/OI ratio of 7.5. Whoever did this was not adding to a position. They were building one from nothing.
The strike was 14% out of the money. The expiry was ten months away. Both details matter, and we'll come back to them.
Fourteen weeks later, on June 16, that contract closed at $1,500.00 — a 757% move from the print. The $17M of premium was worth roughly $150M at that close.
First published: Daily Institutional Flow Digest, March 11, 2026 · SNDK flow on 2026-03-11.
The print itself
| Field | Value |
|---|---|
| Date | 2026-03-11, 12:10:42 ET |
| Symbol | SNDK |
| Side | BUY |
| Type | CALL |
| Strike | 750 |
| Expiration | 2027-01-15 |
| Volume | 1,000 contracts |
| Premium | $17M |
| Entry option price | ~$175 (session close $175.00) |
| Spot price at trade | ~$655 (session close $655.43) |
| Volume z-score | 27.26 — EXTREMELY_UNUSUAL |
| Volume / open interest | 7.46 — HIGH_ACTIVITY |
| Open/close signal | OPEN |
| Source-feed strategy tag | "Long Call" |
Three things stand out.
First, the strike. At $750 against a $655 spot, this was bought out of the money — the opposite of the INTC trade we wrote up in March, where the whale paid up for in-the-money leverage. OTM means the position is worth zero unless the stock actually moves. It is a cleaner expression of conviction and a worse expression of caution.
Second, the expiry. January 2027 gave the position ten months. Combined with an OTM strike, that is the signature of someone underwriting a thesis, not a catalyst. Nobody buys a ten-month OTM call because of next week's print.
Third, the volume/OI ratio. 7.46 means the day's volume was seven times the entire pre-existing open interest on that line. Paired with the OPEN signal, this was net new exposure — not a roll, not a close, not churn against a crowded strike. That distinction is the one we get asked about most, and it is the one that separates a real flag from a headline.
What happened next
SanDisk did not drift. It went nearly vertical through the spring:
| Date | SNDK close | 750C close | Return on the call |
|---|---|---|---|
| 2026-03-11 (print) | $655.43 | $175.00 | — |
| 2026-06-16 | — | $1,500.00 | +757% |
| 2026-06-25 | $2,335.00 (stock peak) | — | — |
| 2026-08-10 | — | $589.75 | +237% |
| 2026-08-27 | $1,484.95 | — | — |
The stock more than tripled from the print to its June 25 high. The call, being both out of the money and leveraged, did considerably better than the stock: 8.6× at the June 16 close.
Then it gave a lot of it back. SNDK has fallen from $2,335 to $1,484.95, and the call's last observed close is $589.75. Anyone still holding is up roughly 237% rather than 757%.
We are showing you both numbers on purpose. A flashback that stops at the peak is marketing. The peak was $1,500 and the position has since roughly halved from there — that is the honest shape of the trade, and it is also the more useful lesson: the hard part of a position like this was never the entry.
Was this a good call, or a lucky one?
Fair question, and the honest answer needs a denominator.
Across the eligible prints we've scored in this window — opening trades with a claimable direction, aged past our 60-day publishing embargo — roughly half worked. That is the base rate this trade sits against. SNDK is the right tail, not the average, and we'd rather you hear that from us than discover it yourself.
What the scanner is actually good at is not picking winners. It is finding the small number of prints each day where somebody committed real money in a way that doesn't fit the line's normal behaviour — a z-score of 27 against a volume/OI of 7.5 — and putting that in front of you the same morning it happens. What you do with it is a separate decision.
Two things this trade teaches
Size and structure disagree more often than you'd think. A $17M print sounds enormous, and it was — but it was 1,000 contracts. The INTC trade was $57M across 50,000 contracts. Premium tells you conviction; contract count tells you how the position will behave. Read both.
An OTM LEAP is a thesis, not a trade. Ten months and 14% out of the money means the buyer needed a structural move, not a good week. When you see that combination, the interesting question isn't "what do they know about next week" — it's "what do they think this company becomes."
See the flow as it prints
This trade appeared in our Unusual Flow feed on the morning of March 11, 2026, alongside everything else that printed that day. We publish the day's institutional flow every session, and we write these flashbacks only after a position has resolved enough to judge honestly.
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