Sandisk officer plans sale of 4,108 shares

An officer of Sandisk Corp has filed a Rule 144 notice to sell 4,108 common shares, following recent 10b5-1 sales totaling 1,800 shares.

Available on EDGAR 09/08/2026 - 04:28 PM EDT Accepted by SEC EDGAR 09/08/2026 - 04:27 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Sandisk Corp (SNDK) received a notice that officer Bernard Shek plans to sell Sandisk common stock under Rule 144. The planned sale covers 4,108 shares held in an account at Morgan Stanley Smith Barney, including 2,308 shares from Restricted Stock Units and 1,800 shares received in the WDC spinoff.

The notice lists prior Rule 10b5-1 sales over the past three months totaling 1,800 shares of Sandisk common stock, executed in three blocks of 600 shares each on July 1, August 3, and September 1, 2026. The securities to be sold were acquired during the period from February 21, 2025 through March 12, 2025.

Key Figures

Planned shares to be sold under Rule 144: 4,108 shares RSU shares to be sold: 2,308 shares WDC spinoff shares to be sold: 1,800 shares +4 more

7 metrics

Planned shares to be sold under Rule 144 4,108 shares Sandisk common stock covered by Bernard Shek’s notice

RSU shares to be sold 2,308 shares Restricted Stock Units acquired on September 3, 2026

WDC spinoff shares to be sold 1,800 shares Shares acquired in WDC-Spinoff on February 21, 2025

Shares sold in past 3 months 1,800 shares Three 10b5-1 sales of 600 shares each in July, August, September 2026

July 1, 2026 sale value $1,252,800.00 600 shares of Sandisk common stock sold under 10b5-1

August 3, 2026 sale value $697,296.00 600 shares of Sandisk common stock sold under 10b5-1

September 1, 2026 sale value $915,360.00 600 shares of Sandisk common stock sold under 10b5-1

Key Terms

Rule 144, Restricted Stock Units, WDC-Spinoff, 10b5-1

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Restricted Stock Units financial

"Common | 09/03/2026 | Restricted Stock Units | Issuer"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

WDC-Spinoff financial

"Common | 02/21/2025 | WDC-Spinoff | Issuer"

10b5-1 regulatory

"10b5-1 Sales for BERNARD SHEK 951 Sandisk Drive"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Form 144 filing disclose for SNDK?

It discloses that Bernard Shek, an officer of Sandisk Corp, has notified the SEC of his intent to sell 4,108 shares of Sandisk common stock under Rule 144, with shares held at Morgan Stanley Smith Barney LLC.

How many SNDK shares is Bernard Shek planning to sell under Rule 144?

The notice covers a proposed sale of 4,108 shares of Sandisk common stock. These include 2,308 shares from Restricted Stock Units acquired on September 3, 2026 and 1,800 shares received in the WDC-Spinoff on February 21, 2025.

What prior Sandisk (SNDK) stock sales are reported in the last three months?

The filing lists three 10b5-1 sales by Bernard Shek, each for 600 shares of Sandisk common stock, on July 1, 2026, August 3, 2026, and September 1, 2026, totaling 1,800 shares and aggregate dollar amounts of $1,252,800.00, $697,296.00, and $915,360.00, respectively.

How were the SNDK shares to be sold by Bernard Shek originally acquired?

According to the notice, 2,308 shares were acquired as Restricted Stock Units on September 3, 2026, and 1,800 shares were acquired in the WDC-Spinoff on February 21, 2025. The remarks state the securities were acquired during the period from February 21, 2025 through March 12, 2025.

What brokerage firm is involved in the planned SNDK share sale?

The common shares covered by the notice are held through Morgan Stanley Smith Barney LLC Executive Financial Services at 1 New York Plaza, 8th Floor, New York, NY 10004, which is the broker listed for these Rule 144 sales of Sandisk common stock.

On what date was the Rule 144 notice for SNDK filed and what market is cited?

The Date of Notice is listed as September 8, 2026, and the securities information section identifies the trading market as NASDAQ for the Sandisk common stock covered by the intended Rule 144 sale.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0002060144
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	SANDISK CORPORATION
SEC File Number	001-42420
Address of Issuer	951 Sandisk Drive Milpitas CALIFORNIA 95035
Phone	4088011000
Name of Person for Whose Account the Securities are To Be Sold	BERNARD SHEK
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	4108	7147920.00	146419001	09/08/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	09/03/2026	Restricted Stock Units	Issuer			2308	09/03/2026	N/A
Common	02/21/2025	WDC-Spinoff	Issuer			1800	02/21/2025	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for BERNARD SHEK 951 Sandisk Drive Milpitas CA 95035	Common	09/01/2026	600	915360.00
10b5-1 Sales for BERNARD SHEK 951 Sandisk Drive Milpitas CA 95035	Common	08/03/2026	600	697296.00
10b5-1 Sales for BERNARD SHEK 951 Sandisk Drive Milpitas CA 95035	Common	07/01/2026	600	1252800.00

144: Remarks and Signature

Remarks	The securities to be sold were acquired upon the spinoff during the period of 02/21/2025 through 03/12/2025.
Date of Notice	09/08/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	03/04/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Bernard Shek
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)