Thomas J. Seifert

CIK: 0001473289

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)215 (62.1%)

Position reduction

Option Exercises (M)68 (19.7%)

Derivative conversions

Awards (A)4 (1.2%)

Compensation grants

Other (G, F, J, C, D, …)59 (17.1%)

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

Companies & Roles (2)

NET

Cloudflare, Inc.

Officer

WOLF

WOLFSPEED, INC.

Director

Discretionary Trading P&L

Holdings

Transaction History (346 total)

NET
Cloudflare, Inc.
Oct 19, 2026
Sale(S)
Direct
1.1K shares at avg. $297.29$327K
NET
Cloudflare, Inc.
Oct 19, 2026
Sale(S)
Direct
2.6K shares at avg. $300.39$794K
NET
Cloudflare, Inc.
Oct 19, 2026
Sale(S)
Direct
598 shares at avg. $301.99$181K
NET
Cloudflare, Inc.
Oct 19, 2026
Sale(S)
Direct
3.4K shares at avg. $298.32$1.0M
NET
Cloudflare, Inc.
Oct 19, 2026
Sale(S)
Direct
502 shares at avg. $303.26$152K
NET
Cloudflare, Inc.
Oct 19, 2026
Exercise(M)
Direct
12.5K shares at avg. $44.72$559K
NET
Cloudflare, Inc.
Oct 19, 2026
Sale(S)
Direct
500 shares at avg. $304.15$152K
NET
Cloudflare, Inc.
Oct 19, 2026
Sale(S)
Direct
3.8K shares at avg. $299.36$1.1M
NET
Cloudflare, Inc.
Oct 15, 2026
Tax Payment(F)
Direct
2.9K shares at avg. $316.32$931K
NET
Cloudflare, Inc.
Sep 17, 2026
Exercise(M)
Employee Stock Option (right to buy)
Direct
10K shares-
NET
Cloudflare, Inc.
Sep 17, 2026
Sale(S)
Direct
700 shares at avg. $329.37$231K
NET
Cloudflare, Inc.
Sep 17, 2026
Sale(S)
Direct
100 shares at avg. $318.90$32K
NET
Cloudflare, Inc.
Sep 17, 2026
Conversion(C)
Direct
10K shares-
NET
Cloudflare, Inc.
Sep 17, 2026
Sale(S)
Direct
100 shares at avg. $336.51$34K
NET
Cloudflare, Inc.
Sep 17, 2026
Sale(S)
Direct
600 shares at avg. $335.32$201K
NET
Cloudflare, Inc.
Sep 17, 2026
Exercise(M)
Class B Common Stock
Direct
10K shares-
NET
Cloudflare, Inc.
Sep 17, 2026
Sale(S)
Direct
100 shares at avg. $320.89$32K
NET
Cloudflare, Inc.
Sep 17, 2026
Sale(S)
Direct
100 shares at avg. $326.56$33K
NET
Cloudflare, Inc.
Sep 17, 2026
Sale(S)
Direct
2.6K shares at avg. $333.62$878K
NET
Cloudflare, Inc.
Sep 17, 2026
Sale(S)
Direct
1.2K shares at avg. $331.59$397K
NET
Cloudflare, Inc.
Sep 17, 2026
Sale(S)
Direct
300 shares at avg. $328.04$98K
NET
Cloudflare, Inc.
Sep 17, 2026
Sale(S)
Direct
700 shares at avg. $330.23$231K
NET
Cloudflare, Inc.
Sep 17, 2026
Sale(S)
Direct
1.6K shares at avg. $332.50$533K
NET
Cloudflare, Inc.
Sep 17, 2026
Sale(S)
Direct
1.9K shares at avg. $334.59$625K
NET
Cloudflare, Inc.
Sep 15, 2026
Tax Payment(F)
Direct
2.9K shares at avg. $327.23$963K

		Type	Shares	Price		Ownership
Oct 19, 2026	NET Cloudflare, Inc.	Sale(S)	1,100	$297.29	$327,021	Direct
Oct 19, 2026	NET Cloudflare, Inc.	Sale(S)	2,643	$300.39	$793,934	Direct
Oct 19, 2026	NET Cloudflare, Inc.	Sale(S)	598	$301.99	$180,593	Direct
Oct 19, 2026	NET Cloudflare, Inc.	Sale(S)	3,401	$298.32	$1,014,590	Direct
Oct 19, 2026	NET Cloudflare, Inc.	Sale(S)	502	$303.26	$152,234	Direct
Oct 19, 2026	NET Cloudflare, Inc.	Exercise(M)	12,500	$44.72	$559,000	Direct
Oct 19, 2026	NET Cloudflare, Inc.	Sale(S)	500	$304.15	$152,075	Direct
Oct 19, 2026	NET Cloudflare, Inc.	Sale(S)	3,756	$299.36	$1,124,379	Direct
Oct 15, 2026	NET Cloudflare, Inc.	Tax Payment(F)	2,944	$316.32	$931,246	Direct
Sep 17, 2026	NET Cloudflare, Inc.	Exercise(M) Employee Stock Option (right to buy)	10,000	-	-	Direct
Sep 17, 2026	NET Cloudflare, Inc.	Sale(S)	700	$329.37	$230,561	Direct
Sep 17, 2026	NET Cloudflare, Inc.	Sale(S)	100	$318.90	$31,890	Direct
Sep 17, 2026	NET Cloudflare, Inc.	Conversion(C)	10,000	-	$0	Direct
Sep 17, 2026	NET Cloudflare, Inc.	Sale(S)	100	$336.51	$33,651	Direct
Sep 17, 2026	NET Cloudflare, Inc.	Sale(S)	600	$335.32	$201,192	Direct
Sep 17, 2026	NET Cloudflare, Inc.	Exercise(M) Class B Common Stock	10,000	-	-	Direct
Sep 17, 2026	NET Cloudflare, Inc.	Sale(S)	100	$320.89	$32,089	Direct
Sep 17, 2026	NET Cloudflare, Inc.	Sale(S)	100	$326.56	$32,656	Direct
Sep 17, 2026	NET Cloudflare, Inc.	Sale(S)	2,632	$333.62	$878,080	Direct
Sep 17, 2026	NET Cloudflare, Inc.	Sale(S)	1,196	$331.59	$396,581	Direct
Sep 17, 2026	NET Cloudflare, Inc.	Sale(S)	300	$328.04	$98,412	Direct
Sep 17, 2026	NET Cloudflare, Inc.	Sale(S)	700	$330.23	$231,159	Direct
Sep 17, 2026	NET Cloudflare, Inc.	Sale(S)	1,604	$332.50	$533,330	Direct
Sep 17, 2026	NET Cloudflare, Inc.	Sale(S)	1,868	$334.59	$625,015	Direct
Sep 15, 2026	NET Cloudflare, Inc.	Tax Payment(F)	2,944	$327.23	$963,365	Direct

1-25 of 346 transactions

…

About SEIFERT THOMAS J

SEIFERT THOMAS J (SEC CIK 0001473289) files insider reports with the SEC as Chief Financial Officer of Cloudflare, Inc. (NET) and Director of WOLFSPEED, INC. (WOLF).

Signal8 holds 46 ownership filings by SEIFERT THOMAS J (1 Form 3, 45 Form 4), filed between Sep 5, 2024 and Oct 19, 2026. Those filings report 346 transactions, from Sep 4, 2024 to Oct 19, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on SEIFERT THOMAS J's filings is in AUSTIN, TX.

Recent filings by SEIFERT THOMAS J

Oct 19, 2026: Open-market sales of NET shares (5 lines, Form 4, code S).
Oct 19, 2026: Option exercise of NET shares (Form 4, code M).
Oct 19, 2026: Open-market sales of NET shares (2 lines, Form 4, code S).
Oct 15, 2026: Tax withholding of NET shares (Form 4, code F).
Sep 17, 2026: Option exercise of NET derivative securities (Form 4, code M).

Other insiders filing for Cloudflare, Inc. (NET)

Ledbetter Carl, Director
Zatlyn Michelle, President and Board Co-Chair
Starzak Alissa Michelle, Chief Legal Officer
Riley Janel, Chief Accounting Officer
Prince Matthew, CEO & Board Co-Chair
Graham-Cumming John, Director

How to read Form 4 transaction codes