Was Bernard Shek’s Sandisk (SNDK) share sale under a Rule 10b5-1 plan?

Yes. The Form 4 notes that Bernard Shek’s sales were effected under a Rule 10b5-1 trading plan. The plan was adopted on March 4, 2026, indicating these transactions were pre-scheduled rather than discretionary, which can reduce the significance of the timing for investors.

Bernard Shek (SNDK) sells 600 Sandisk shares under 10b5-1 trading plan

Filing Impact

(Very High)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

Sandisk Corp Chief Legal Officer and Secretary Bernard Shek reported an open-market sale of common stock. He sold 600 shares on July 1, 2026 at a price of $2,088.00 per share. After this transaction, he directly holds 31,515 shares of Sandisk common stock.

The filing states that these sales were executed under a pre-arranged Rule 10b5-1 trading plan adopted by the reporting person on March 4, 2026, indicating the trades were scheduled in advance rather than timed opportunistically.

Insider Trade Summary 10b5-1

Net Seller: 600 shares ($1,252,800)

Net Sell 1 txn

Insider Shek Bernard

Role Chief Legal Officer & Secty

Sold 600 shs ($1.25M)

Type	Security	Shares	Price	Value
Sale	Common Stock	600	$2,088.00	$1.25M

Holdings After Transaction: Common Stock — 31,515 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares sold: 600 shares Sale price: $2,088.00 per share Shares held after: 31,515 shares +2 more

5 metrics

Shares sold 600 shares Open-market sale on July 1, 2026

Sale price $2,088.00 per share Price for the 600 shares sold

Shares held after 31,515 shares Direct holdings after the transaction

Net share change -600 shares Net buy/sell shares in this Form 4

Transaction type Open-market sale Non-derivative common stock transaction code S

Key Terms

Rule 10b5-1 trading plan, open-market sale, Common Stock, Form 4

4 terms

Rule 10b5-1 trading plan regulatory

"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

open-market sale financial

"transaction_action: open-market sale"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Common Stock financial

"security_title: Common Stock"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Form 4 regulatory

"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/02/2026 - 05:43 PM Accepted by SEC EDGAR 07/02/2026 - 05:43 PM

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Shek Bernard

(Last)

(First)

(Middle)

C/O SANDISK CORPORATION

951 SANDISK DRIVE

(Street)

MILPITAS

CALIFORNIA

95035

(City)

(State)

(Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Sandisk Corp [ SNDK ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	Chief Legal Officer & Secty

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/01/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	07/01/2026		S⁽¹⁾		600	D	$2,088	31,515	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 4, 2026.

	By: /s/ Van Huynh Attorney-in-Fact For: Bernard Shek	07/02/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did Sandisk Corp (SNDK) report for Bernard Shek?

Sandisk Corp reported that Chief Legal Officer and Secretary Bernard Shek sold 600 shares of common stock. The sale occurred on July 1, 2026 as an open-market transaction, and was executed under a pre-arranged Rule 10b5-1 trading plan adopted earlier in the year.

At what price did Bernard Shek sell Sandisk (SNDK) shares in this Form 4?

Bernard Shek sold Sandisk common stock at $2,088.00 per share. The transaction involved 600 shares in an open-market sale, as disclosed in the Form 4, and was conducted pursuant to a Rule 10b5-1 trading plan adopted on March 4, 2026.

How many Sandisk (SNDK) shares does Bernard Shek hold after the reported sale?

After the reported sale, Bernard Shek directly holds 31,515 shares of Sandisk common stock. This figure reflects his remaining position following the disposition of 600 shares in the July 1, 2026 open-market transaction disclosed in the Form 4 filing.

What is the nature of ownership for Bernard Shek’s Sandisk (SNDK) shares in this filing?

The Form 4 identifies Bernard Shek’s ownership as direct, coded as “D” for the reported common stock. This means the 31,515 shares shown following the transaction are held directly by him, rather than through an indirect entity like a trust or partnership.