Sandisk (SNDK) Smart-Money Check: Options Flow, Insider Trades and Institutional Moves
SNDK: calls took 68% of options premium; unusual trades put $184.5M into calls and $15.6M into puts. Here's what the data says.
SNDKSandisk Corporation$1,609.46-4.90%at publication · view live →Sandisk Corporation (SNDK) fell 4.9% to $1,609.46 in the latest session. The latest catalyst in the headlines: GMIF2026 Annual Awards Unveiled: Samsung, Sandisk, Lenovo, Silicon Motion, BIWIN, and More Recognized (PR Newswire). SNDK also ranks #11 among the most-discussed stocks on social media, with 17 mentions in the past 24 hours, up 325% from the prior day.
Headlines tell you what happened. The money tells you what traders and insiders are doing about it. Below, we run SNDK through the GTA Terminal (the options-flow, insider, institutional and congressional trackers our Pro members use) to see what's happening beneath the surface.
What the options market is saying
Options traders exchanged 40,089 calls and 34,488 puts on SNDK, a put/call volume ratio of 0.86. In dollar terms, about $317.6M of premium went into calls versus $149.5M into puts (68% call-side): a fairly balanced market without a decisive directional tilt.
Open interest, the positions still on the books, shows a put/call ratio of 1.32 (259,025 call contracts vs. 342,657 puts outstanding), so the existing book is tilted toward puts.
The heaviest activity clustered in the Nov 20 expiration, where $218.3M of premium changed hands (92% in calls).
Several contracts traded more volume than their existing open interest, a sign of new positions being opened rather than old ones being closed:
- $800 calls expiring Nov 20: 2,053 contracts vs. 130 open interest, about $161.3M in premium (in the money)
- $1620 puts expiring Oct 16: 1,065 contracts vs. 307 open interest, about $7.2M in premium (in the money)
- $1600 calls expiring Oct 16: 1,592 contracts vs. 985 open interest, about $6.1M in premium (in the money)
- $1610 puts expiring Oct 16: 923 contracts vs. 554 open interest, about $5.6M in premium (in the money)
For the nearest expiration (Oct 16), max pain, the strike where the most option holders would lose money, sits at $1660, 3.1% above the current price.
Biggest contracts by premium
| Contract | Volume | Open int. | Last | Premium |
|---|---|---|---|---|
| $800 Call · Nov 20 | 2,053 | 130 | $785.87 | $161.3M |
| $320 Call · Nov 20 | 218 | 18 | $1,281.70 | $27.9M |
| $1600 Put · Oct 16 | 1,470 | 1,466 | $55.28 | $8.1M |
| $1620 Put · Oct 16 | 1,065 | 307 | $67.55 | $7.2M |
| $1600 Call · Oct 16 | 1,592 | 985 | $38.25 | $6.1M |
| $1610 Put · Oct 16 | 923 | 554 | $61.00 | $5.6M |
Options data: Nasdaq option chains, end-of-day volume and open interest for the session of Oct 12, 2026. Premium = volume × last price × 100.
What insiders are doing
On the other side, insiders reported 10 sales totaling $122.4M. Insider selling is common: executives sell for taxes, diversification and pre-scheduled 10b5-1 plans, so purchases made with personal cash are generally the stronger signal.
| Insider | Role | Date | Type | Shares | Value |
|---|---|---|---|---|---|
| Bernard Shek | Chief Legal Officer and Secty | Oct 1 | Sell | 600 | $1.0M |
| David Goeckeler | Director, Chairman & CEO | Sep 17 | Sell | 33,841 | $53.3M |
| Luis Felipe Visoso | EVP & CFO | Sep 15 | Sell | 1,000 | $1.6M |
| David Goeckeler | Director, Chairman & CEO | Sep 14 | Sell | 33,838 | $51.7M |
| Bernard Shek | Chief Legal Officer & Secty | Sep 8 | Sell | 2,308 | $4.1M |
| Alper Ilkbahar | EVP & Chief Technology Officer | Sep 3 | Sell | 400 | $626K |
| Alper Ilkbahar | EVP & Chief Technology Officer | Sep 3 | Sell | 4,712 | $7.3M |
| Bernard Shek | Chief Legal Officer & Secty | Sep 1 | Sell | 600 | $915K |
Source: SEC Form 4 filings, open-market purchases (code P) and sales (code S).
Institutions and superinvestors
Institutions hold 89.6% of SNDK's shares across 1,951 funds and money managers. In the latest 13F quarter, 1,276 holders added to their positions (24.24M shares) while 577 trimmed (26.62M shares). 731 opened brand-new positions and 99 sold out completely.
Largest holders
| Holder | Shares | Change | % of shares | Value |
|---|---|---|---|---|
| Vanguard Group Inc | 16.98M | -584,907 | 11.71% | $26.9B |
| Blackrock, Inc. | 10.30M | -108,155 | 7.10% | $16.3B |
| Vanguard Capital Management Llc | 9.67M | 142,136 | 6.67% | $15.3B |
| Fmr Llc | 7.86M | -5.53M | 5.42% | $12.4B |
| State Street Corp | 5.93M | 353,601 | 4.09% | $9.4B |
| Invesco Ltd. | 5.61M | 4.45M | 3.87% | $8.9B |
Among the superinvestor portfolios GTA tracks, 2 own the stock: D. E. Shaw & Co. (D. E. Shaw), reduced, Duquesne Family Office (Stanley Druckenmiller), reduced.
Source: SEC 13F filings via Nasdaq; superinvestor portfolios from each fund's latest 13F.
Congressional trades
Members of Congress disclosed 6 trades in SNDK over the past year (4 purchases, 2 sales).
| Member | Type | Amount | Traded | Filed |
|---|---|---|---|---|
| Josh Gottheimer (D) | Buy | $1,001 - $15,000 | May 7 | Jun 3 |
| Gilbert Ray Cisneros, Jr. (D) | Buy | $1,001 - $15,000 | Mar 13 | Apr 7 |
| Gilbert Ray Cisneros, Jr. (D) | Buy | $1,001 - $15,000 | Jan 9 | Feb 13 |
| Lisa C. McClain (R) | Sell | $1,001 - $15,000 | Oct 31, 2025 | Nov 21, 2025 |
| Lisa C. McClain (R) | Sell | $1,001 - $15,000 | Oct 30, 2025 | Nov 21, 2025 |
| Lisa C. McClain (R) | Buy | $1,001 - $15,000 | Oct 30, 2025 | Nov 21, 2025 |
Source: U.S. House Periodic Transaction Reports. Amounts are disclosed as ranges.
Price action and key levels
SNDK is -6.5% over the past month, -5.5% over three months and +85.7% over six. It trades 0.0% below its 50-day average of $1,582.50, and sits 67% of the way through its 52-week range ($116.17 to $2,354.39). Wall Street's average one-year price target of $2,200.00 implies +36.7% from here.
The bottom line
| Signal | Reading | Lean |
|---|---|---|
| Options flow | 68% of premium in calls · P/C 0.86 | Neutral |
| Insider trading (6 mo) | $0 bought · $122.4M sold | Bearish |
| Institutions (13F) | 0.91 shares added per share sold | Neutral |
| Congress (12 mo) | 4 buys · 2 sells | Bullish |
| Trend | Below 50-day avg · 3-mo -5.5% | Bearish |
Of the 5 GTA signals above, 1 lean bullish and 2 lean bearish, so the data on SNDK lean bearish right now. Signals like these shift quickly around earnings, news and expirations, which is why our members track them live rather than once a week.
This article was produced by the GTA Research Desk from GTA Terminal data as of Oct 12, 2026 6:33 AM ET. It is for information and education only and is not investment advice or a recommendation to buy or sell any security. Global Traders Academy may hold positions in the securities mentioned.
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