SEC Form 4 · accession 0001473289-26-000029

Cloudflare, Inc. · NET

Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗

Reporting owner

Thomas J Seifert

Officer — Chief Financial Officer

Period of report

Sep 17, 2026

Accepted (ET)

Sep 21, 2026 · 4:50 pm EDT

Rule 10b5-1 plan

yes — trade under a plan

Issuer CIK

0001477333

Table I — non-derivative securities

Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Class A Common Stock^F1	Sep 17, 2026	C	10,000	—	A	117,902	D
Class A Common Stock	Sep 17, 2026	S	100	$318.90	D	117,802	D
Class A Common Stock	Sep 17, 2026	S	100	$320.89	D	117,702	D
Class A Common Stock	Sep 17, 2026	S	100	$326.56	D	117,602	D
Class A Common Stock^F3	Sep 17, 2026	S	300	$328.04	D	117,302	D
Class A Common Stock^F4	Sep 17, 2026	S	700	$329.3731	D	116,602	D
Class A Common Stock^F5	Sep 17, 2026	S	700	$330.2278	D	115,902	D
Class A Common Stock^F6	Sep 17, 2026	S	1,196	$331.5898	D	114,706	D
Class A Common Stock^F7	Sep 17, 2026	S	1,604	$332.5002	D	113,102	D
Class A Common Stock^F8	Sep 17, 2026	S	2,632	$333.6171	D	110,470	D
Class A Common Stock^F9	Sep 17, 2026	S	1,868	$334.5905	D	108,602	D
Class A Common Stock^F10	Sep 17, 2026	S	600	$335.3197	D	108,002	D
Class A Common Stock	Sep 17, 2026	S	100	$336.51	D	107,902	D
Class A Common Stock^F11	holding	—	—		—	92,337	I	See footnote

Table II — derivative securities

Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	Owned after	D/I
Employee Stock Option (right to buy)^F12,F1	$2.04	Sep 17, 2026	M	10,000	D	—	Jul 25, 2027	Class B Common Stock	10,000	0	D
Class B Common Stock^F1	—	Sep 17, 2026	M	10,000	A	—	—	Class A Common Stock	10,000	18,925	D
Class B Common Stock^F1	—	Sep 17, 2026	C	10,000	D	—	—	Class A Common Stock	10,000	8,925	D
Class B Common Stock^F13,F1	—	holding	—	—	—	—	—	Class A Common Stock	150,000	150,000	I
Class B Common Stock^F14,F1	—	holding	—	—	—	—	—	Class A Common Stock	46,100	46,100	I
Class B Common Stock^F15,F1	—	holding	—	—	—	—	—	Class A Common Stock	46,100	46,100	I
Class B Common Stock^F16,F1	—	holding	—	—	—	—	—	Class A Common Stock	46,100	46,100	I

Explanation of responses

F1Each share of Class B Common Stock is convertible at any time into Class A Common Stock on a one-to-one basis at the reporting person's election and has no expiration date.
F10The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $335.16 to $335.53, inclusive.
F11The shares are held of record by the 2026 Seifert Grantor Retained Annuity Trust dated May 27, 2026, for which the reporting person serves as trustee.
F12Shares subject to the option are fully vested and immediately exercisable.
F13The shares are held of record by Center Court Partners Ltd., for which the reporting person serves as a partner.
F14The shares are held of record by Center Court 2020 Trust 1 dated December 11, 2020, for which the reporting person serves as trustee.
F15The shares are held of record by Center Court 2020 Trust 2 dated December 11, 2020, for which the reporting person serves as trustee.
F16The shares are held of record by Center Court 2020 Trust 3 dated December 11, 2020, for which the reporting person serves as trustee.
F2The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 20, 2025.
F3The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $327.80 to $328.16, inclusive. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (3) through (10) to this Form 4.
F4The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $328.81 to $329.69, inclusive.
F5The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $329.85 to $330.73, inclusive.
F6The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $331.09 to $332.07, inclusive.
F7The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $332.09 to $333.06, inclusive.
F8The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $333.11 to $334.10, inclusive.
F9The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $334.14 to $335.12, inclusive.