Sandisk holder plans sale of 33,838 shares

Stockholder David Goeckeler filed a Rule 144 notice to potentially sell 33,838 Sandisk common shares acquired from recent RSU and PSU vesting.

Rhea-AI Filing Summary

Sandisk Corp (SNDK) received a Form 144 notice from stockholder David Goeckeler covering a proposed sale of up to 33,838 shares of common stock through Morgan Stanley Smith Barney LLC on NASDAQ. The filing lists an aggregate market value of $55,269,297.30 as of September 14, 2026.

The shares to be sold were acquired upon vesting of 26,497 restricted stock units on May 20, 2026 and 7,341 performance stock units on August 25, 2026 during the period from May 20, 2026 through September 3, 2026.

Key Figures

Shares covered by Form 144: 33,838 shares Aggregate market value: $55,269,297.30 Restricted Stock Units vested: 26,497 units +2 more

5 metrics

Shares covered by Form 144 33,838 shares Common stock proposed to be sold through Morgan Stanley Smith Barney LLC

Aggregate market value $55,269,297.30 Value of 33,838 shares of common stock as of September 14, 2026

Restricted Stock Units vested 26,497 units RSUs acquired on May 20, 2026 and noted as securities to be sold

Performance Stock Units vested 7,341 units PSUs acquired on August 25, 2026 and noted as securities to be sold

Notice date September 14, 2026 Date of Form 144 notice signed by David Goeckeler

Key Terms

Rule 144, Restricted Stock Units, Performance Stock Units

3 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 | 05/20/2026 | 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.

Performance Stock Units financial

"Common | 08/25/2026 | Performance Stock Units | Issuer"

Performance stock units are a type of company award that grants employees shares of stock only if certain performance goals are met. They motivate employees to work toward specific company achievements, aligning their interests with those of shareholders. For investors, they can influence a company's future stock supply and reflect management’s confidence in reaching key targets.

FAQ

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

What did Sandisk (SNDK) disclose in this Form 144 filing?

Sandisk disclosed that stockholder David Goeckeler filed a Form 144 covering a proposed sale of up to 33,838 shares of Sandisk common stock through Morgan Stanley Smith Barney LLC on NASDAQ, with an aggregate market value of $55,269,297.30 as of September 14, 2026.

How many Sandisk (SNDK) shares are covered by the Form 144 notice?

The Form 144 notice covers a proposed sale of up to 33,838 shares of Sandisk common stock. These shares are to be sold through Morgan Stanley Smith Barney LLC, as indicated in the filing.

What is the reported market value of the Sandisk (SNDK) shares in the Form 144?

The filing reports an aggregate market value of $55,269,297.30 for the 33,838 shares of Sandisk common stock covered by the Form 144, with the valuation dated September 14, 2026.

How were the Sandisk (SNDK) shares in this Form 144 acquired?

The shares were acquired upon the vesting of equity awards: 26,497 restricted stock units that vested on May 20, 2026 and 7,341 performance stock units that vested on August 25, 2026, during the period from May 20, 2026 through September 3, 2026.

Who is the broker handling the potential Sandisk (SNDK) share sale under this Form 144?

The broker identified is Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY 10004, which is listed as handling the potential sale of the Sandisk common shares on NASDAQ.

When was the Form 144 notice for Sandisk (SNDK) filed by David Goeckeler?

The Form 144 notice is dated September 14, 2026, as indicated in the remarks and signature section signed “/s/ David Goeckeler.”

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

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Available on EDGAR 09/14/2026 - 04:54 PM Accepted by SEC EDGAR 09/14/2026 - 04:47 PM Learn about SEC filing dates

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	0001713941
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	DAVID GOECKELER
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	Director
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	33838	55269297.30	146419001	09/14/2026	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	05/20/2026	Restricted Stock Units	Issuer			26497	05/20/2026	N/A
Common	08/25/2026	Performance Stock Units	Issuer			7341	08/25/2026	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

Nothing to Report

144: Remarks and Signature

Remarks	The securities to be sold were acquired upon the vesting of restricted stock units during the period of 05/20/2026 through 09/03/2026.
Date of Notice	09/14/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	05/29/2026
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/ David Goeckeler
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)