Matthew E. Massengill

CIK: 0001232826

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)11 (55.0%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)9 (45.0%)

Compensation grants

Other (G, F, J, C, D, …)0 (0.0%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (2)

WDC

WESTERN DIGITAL CORP

Director

SNDK

Sandisk Corp

Director

Discretionary Trading P&L

Holdings

Transaction History (20 total)

WDC
WESTERN DIGITAL CORP
Sep 17, 2026
Award(A)
Dividend Equivalent Rights
Direct
10 shares-
WDC
WESTERN DIGITAL CORP
Jun 17, 2026
Award(A)
Dividend Equivalent Rights
Direct
6 shares-
WDC
WESTERN DIGITAL CORP
Mar 18, 2026
Award(A)
Dividend Equivalent Rights
Direct
12 shares-
WDC
WESTERN DIGITAL CORP
Feb 5, 2026
Sale(S)
Indirect
7K shares at avg. $258.67$1.8M
WDC
WESTERN DIGITAL CORP
Feb 5, 2026
Sale(S)
Indirect
4.9K shares at avg. $259.59$1.3M
WDC
WESTERN DIGITAL CORP
Feb 5, 2026
Sale(S)
Indirect
6K shares at avg. $260.57$1.6M
WDC
WESTERN DIGITAL CORP
Feb 5, 2026
Sale(S)
Indirect
2.3K shares at avg. $262.77$604K
WDC
WESTERN DIGITAL CORP
Feb 5, 2026
Sale(S)
Indirect
2.6K shares at avg. $264.01$686K
WDC
WESTERN DIGITAL CORP
Feb 5, 2026
Sale(S)
Indirect
2.2K shares at avg. $264.99$583K
WDC
WESTERN DIGITAL CORP
Feb 5, 2026
Sale(S)
Indirect
916 shares at avg. $265.92$244K
WDC
WESTERN DIGITAL CORP
Feb 5, 2026
Sale(S)
Indirect
400 shares at avg. $268.06$107K
WDC
WESTERN DIGITAL CORP
Feb 5, 2026
Sale(S)
Indirect
3.6K shares at avg. $261.71$941K
WDC
WESTERN DIGITAL CORP
Feb 5, 2026
Sale(S)
Indirect
2.6K shares at avg. $256.63$667K
WDC
WESTERN DIGITAL CORP
Feb 5, 2026
Sale(S)
Indirect
4.4K shares at avg. $257.69$1.1M
WDC
WESTERN DIGITAL CORP
Dec 18, 2025
Award(A)
Dividend Equivalent Rights
Direct
21 shares-
WDC
WESTERN DIGITAL CORP
Nov 20, 2025
Award(A)
Direct
1.6K shares-
WDC
WESTERN DIGITAL CORP
Sep 18, 2025
Award(A)
Dividend Equivalent Rights
Direct
26 shares-
WDC
WESTERN DIGITAL CORP
Jun 18, 2025
Award(A)
Dividend Equivalent Rights
Direct
46 shares-
SNDK
Sandisk Corp
Mar 3, 2025
Award(A)
Direct
4.8K shares-
WDC
WESTERN DIGITAL CORP
Nov 20, 2024
Award(A)
Direct
4.5K shares-

		Type	Shares	Price		Ownership
Sep 17, 2026	WDC WESTERN DIGITAL CORP	Award(A) Dividend Equivalent Rights	10	-	-	Direct
Jun 17, 2026	WDC WESTERN DIGITAL CORP	Award(A) Dividend Equivalent Rights	6	-	-	Direct
Mar 18, 2026	WDC WESTERN DIGITAL CORP	Award(A) Dividend Equivalent Rights	12	-	-	Direct
Feb 5, 2026	WDC WESTERN DIGITAL CORP	Sale(S)	7,000	$258.67	$1,810,703	Indirect
Feb 5, 2026	WDC WESTERN DIGITAL CORP	Sale(S)	4,915	$259.59	$1,275,896	Indirect
Feb 5, 2026	WDC WESTERN DIGITAL CORP	Sale(S)	5,987	$260.57	$1,560,037	Indirect
Feb 5, 2026	WDC WESTERN DIGITAL CORP	Sale(S)	2,300	$262.77	$604,366	Indirect
Feb 5, 2026	WDC WESTERN DIGITAL CORP	Sale(S)	2,600	$264.01	$686,429	Indirect
Feb 5, 2026	WDC WESTERN DIGITAL CORP	Sale(S)	2,200	$264.99	$582,980	Indirect
Feb 5, 2026	WDC WESTERN DIGITAL CORP	Sale(S)	916	$265.92	$243,580	Indirect
Feb 5, 2026	WDC WESTERN DIGITAL CORP	Sale(S)	400	$268.06	$107,222	Indirect
Feb 5, 2026	WDC WESTERN DIGITAL CORP	Sale(S)	3,597	$261.71	$941,363	Indirect
Feb 5, 2026	WDC WESTERN DIGITAL CORP	Sale(S)	2,600	$256.63	$667,241	Indirect
Feb 5, 2026	WDC WESTERN DIGITAL CORP	Sale(S)	4,411	$257.69	$1,136,649	Indirect
Dec 18, 2025	WDC WESTERN DIGITAL CORP	Award(A) Dividend Equivalent Rights	21	-	-	Direct
Nov 20, 2025	WDC WESTERN DIGITAL CORP	Award(A)	1,585	-	-	Direct
Sep 18, 2025	WDC WESTERN DIGITAL CORP	Award(A) Dividend Equivalent Rights	26	-	-	Direct
Jun 18, 2025	WDC WESTERN DIGITAL CORP	Award(A) Dividend Equivalent Rights	46	-	-	Direct
Mar 3, 2025	SNDK Sandisk Corp	Award(A)	4,840	-	-	Direct
Nov 20, 2024	WDC WESTERN DIGITAL CORP	Award(A)	4,542	-	$0	Direct

1-20 of 20 transactions

About MASSENGILL MATTHEW E

MASSENGILL MATTHEW E (SEC CIK 0001232826) files insider reports with the SEC as Director of WESTERN DIGITAL CORP (WDC) and Director of Sandisk Corp (SNDK).

Signal8 holds 11 ownership filings by MASSENGILL MATTHEW E (1 Form 3, 10 Form 4), filed between Nov 22, 2024 and Sep 21, 2026. Those filings report 20 transactions, from Nov 20, 2024 to Sep 17, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on MASSENGILL MATTHEW E's filings is in SAN JOSE, CA.

Recent filings by MASSENGILL MATTHEW E

Sep 17, 2026: Grant or award of WDC derivative securities (Form 4, code A).
Jun 17, 2026: Grant or award of WDC derivative securities (Form 4, code A).
Mar 18, 2026: Grant or award of WDC derivative securities (Form 4, code A).
Feb 5, 2026: Open-market sales of WDC shares (11 lines, Form 4, code S).
Dec 18, 2025: Grant or award of WDC derivative securities (Form 4, code A).

Other insiders filing for WESTERN DIGITAL CORP (WDC)

Cole Martin I, Director
Tregillis Cynthia L, Chief Legal Officer & Corp Sec
Tan Irving, Chief Executive Officer
STREETER STEPHANIE A, Director
Shihab Ahmed Mohammed, Chief Product Officer
Sennesael Kris, Chief Financial Officer

How to read Form 4 transaction codes