Thomas J. Seifert - 15 Oct 2026 Form 4 Insider Report for Cloudflare, Inc. (NET)

Reporting relationship: Chief Financial Officer
Issuer ticker: NET
Reported as of: 15 Oct 2026
Net transaction value: -$3,744,827
SEC form: 4
Accepted by SEC: 19 Oct 2026, 19:04:44 UTC
Prior SEC filing: 21 Sep 2026
Source filing: View source filing
Reporting owner signature: /s/ Charlotte Bowe, by power of attorney

Filing notes and source

Key filing fact

Thomas J. Seifert filed Form 4 for Cloudflare, Inc. (NET) on 19 Oct 2026.

Key facts

This page summarizes Thomas J. Seifert's Form 4 filing for Cloudflare, Inc. (NET).
10 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 19 Oct 2026, 19:04.

Change

Previous filing in this sequence was filed on 21 Sep 2026.
Current net transaction value: -$3,744,827.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001473289 Primary reporting owner

SEIFERT THOMAS J

Relationship: Chief Financial Officer
Address: C/O CLOUDFLARE, INC., 405 COMAL STREET, AUSTIN
Signature: /s/ Charlotte Bowe, by power of attorney
Signature date: 19 Oct 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

NET transaction

Class A Common Stock

Tax liability

Transaction value
Shares: -2,944
Change %: -2.7%
Price: $316.32^*
Shares after: 104,958
Date: 15 Oct 2026
Ownership: Direct
Footnotes: F1

NET transaction

Class A Common Stock

Options Exercise

Transaction value
Shares: +12,500
Change %: +12%
Price: $44.72^*
Shares after: 117,458
Date: 19 Oct 2026
Ownership: Direct

NET transaction

Class A Common Stock

Sale

Transaction value: -$327,021
Shares: -1,100
Change %: -0.94%
Price: $297.29
Shares after: 116,358
Date: 19 Oct 2026
Ownership: Direct
Footnotes: F2, F3

NET transaction

Class A Common Stock

Sale

Transaction value: -$1,014,590
Shares: -3,401
Change %: -2.9%
Price: $298.32
Shares after: 112,957
Date: 19 Oct 2026
Ownership: Direct
Footnotes: F2, F4

NET transaction

Class A Common Stock

Sale

Transaction value: -$1,124,379
Shares: -3,756
Change %: -3.3%
Price: $299.36
Shares after: 109,201
Date: 19 Oct 2026
Ownership: Direct
Footnotes: F2, F5

NET transaction

Class A Common Stock

Sale

Transaction value: -$793,934
Shares: -2,643
Change %: -2.4%
Price: $300.39
Shares after: 106,558
Date: 19 Oct 2026
Ownership: Direct
Footnotes: F2, F6

NET transaction

Class A Common Stock

Sale

Transaction value: -$180,593
Shares: -598
Change %: -0.56%
Price: $301.99
Shares after: 105,960
Date: 19 Oct 2026
Ownership: Direct
Footnotes: F2, F7

NET transaction

Class A Common Stock

Sale

Transaction value: -$152,234
Shares: -502
Change %: -0.47%
Price: $303.26
Shares after: 105,458
Date: 19 Oct 2026
Ownership: Direct
Footnotes: F2, F8

NET transaction

Class A Common Stock

Sale

Transaction value: -$152,075
Shares: -500
Change %: -0.47%
Price: $304.15
Shares after: 104,958
Date: 19 Oct 2026
Ownership: Direct
Footnotes: F2, F9

NET holding

Class A Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 92,337
Date: 15 Oct 2026
Ownership: See footnote
Footnotes: F10

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

NET transaction Derivative

Performance Stock Option (right to buy)

Options Exercise

Transaction value
Shares: -12,500
Change %: -2.5%
Price: $0.000000^*
Shares after: 487,500
Date: 19 Oct 2026
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 12,500
Exercise price: $44.72
Footnotes: F11

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 11 footnotes

Footnote F1

The shares were withheld to satisfy the reporting person's tax liability in connection with the vesting of restricted stock units, or RSUs.

Footnote F2

The 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.

Footnote F3

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $296.84 to $297.75, 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 (9) to this Form 4.

Footnote F4

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $297.90 to $298.85, inclusive.

Footnote F5

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $298.93 to $299.92, inclusive.

Footnote F6

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $299.93 to $300.91, inclusive.

Footnote F7

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $301.55 to $302.29, inclusive.

Footnote F8

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $302.57 to $303.56, inclusive.

Footnote F9

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $303.91 to $304.48, inclusive.

Footnote F10

The 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.

Footnote F11

The shares subject to the Performance Stock Option are comprised of nine separate tranches that become eligible to vest upon achievement of certain stock price targets (the "Stock Price Goals"). Upon satisfaction of a Stock Price Goal, 1/6 of the shares subject to the applicable tranche vests and becomes exercisable on each Issuer quarterly vesting date (2/15, 5/15, 8/15 or 11/15) occurring on or after the date of certification of achievement of the applicable Stock Price Goal for such tranche. As of the date of this report, six of the nine stock price goals have been satisfied and the underlying shares vest as set forth above. The remaining three tranches, representing 277,500 shares subject to the Performance Stock Option, become eligible to vest upon achievement of the applicable Stock Price Goal.