Key facts
- This page summarizes Thomas J. Seifert's Form 4 filing for Cloudflare, Inc. (NET).
- 11 reported transactions and 7 derivative rows are listed below.
- Accepted by SEC: 19 Aug 2026, 17:35.
Thomas J. Seifert - 17 Aug 2026 Form 4 Insider Report for Cloudflare, Inc. (NET)
- Reporting relationship
- Chief Financial Officer
- Issuer ticker
- NET
- Reported as of
- 17 Aug 2026
- Net transaction value
- -$3,073,176
- SEC form
- 4
- Accepted by SEC
- 19 Aug 2026, 17:35:32 UTC
- Prior SEC filing
- 18 Aug 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Charlotte Bowe, by power of attorney
Source evidence
Original filing metadata and source links for verification.
4 source fields
Reporting owner
1 detail
Key filing fact
Thomas J. Seifert filed Form 4 for Cloudflare, Inc. (NET) on 19 Aug 2026.
Change
- Previous filing in this sequence was filed on 18 Aug 2026.
- Current net transaction value: -$3,073,176.
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
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
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 Aug 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
NET
transaction
Class A Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +10,000
- Change %
- +9%
- Price
- Shares after
- 120,846
- Date
- 17 Aug 2026
- Ownership
- Direct
- Footnotes
- F1
NET
transaction
Class A Common Stock
Sale
- Transaction value
- $274,724
- Shares
- -900
- Change %
- -0.74%
- Price
- $305.25
- Shares after
- 119,946
- Date
- 17 Aug 2026
- Ownership
- Direct
- Footnotes
- F2, F3
NET
transaction
Class A Common Stock
Sale
- Transaction value
- $901,579
- Shares
- -2,944
- Change %
- -2.5%
- Price
- $306.24
- Shares after
- 117,002
- Date
- 17 Aug 2026
- Ownership
- Direct
- Footnotes
- F2, F4
NET
transaction
Class A Common Stock
Sale
- Transaction value
- $754,715
- Shares
- -2,456
- Change %
- -2.1%
- Price
- $307.29
- Shares after
- 114,546
- Date
- 17 Aug 2026
- Ownership
- Direct
- Footnotes
- F2, F5
NET
transaction
Class A Common Stock
Sale
- Transaction value
- $955,512
- Shares
- -3,100
- Change %
- -2.7%
- Price
- $308.23
- Shares after
- 111,446
- Date
- 17 Aug 2026
- Ownership
- Direct
- Footnotes
- F2, F6
NET
transaction
Class A Common Stock
Sale
- Transaction value
- $92,721
- Shares
- -300
- Change %
- -0.27%
- Price
- $309.07
- Shares after
- 111,146
- Date
- 17 Aug 2026
- Ownership
- Direct
- Footnotes
- F2, F7
NET
transaction
Class A Common Stock
Sale
- Transaction value
- $62,464
- Shares
- -200
- Change %
- -0.18%
- Price
- $312.32
- Shares after
- 110,946
- Date
- 17 Aug 2026
- Ownership
- Direct
- Footnotes
- F2, F8
NET
transaction
Class A Common Stock
Sale
- Transaction value
- $31,461
- Shares
- -100
- Change %
- -0.09%
- Price
- $314.61
- Shares after
- 110,846
- Date
- 17 Aug 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
- 17 Aug 2026
- Ownership
- See footnote
- Footnotes
- F10
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
NET
transaction
Derivative
Employee Stock Option (right to buy)
Options Exercise
- Transaction value
- Shares
- -10,000
- Change %
- -50%
- Price
- $0.000000*
- Shares after
- 10,000
- Date
- 17 Aug 2026
- Ownership
- Direct
- Underlying class
- Class B Common Stock
- Underlying amount
- 10,000
- Exercise price
- $2.04
- Footnotes
- F1, F11
NET
transaction
Derivative
Class B Common Stock
Options Exercise
- Transaction value
- Shares
- +10,000
- Change %
- +112%
- Price
- $0.000000*
- Shares after
- 18,925
- Date
- 17 Aug 2026
- Ownership
- Direct
- Underlying class
- Class A Common Stock
- Underlying amount
- 10,000
- Exercise price
- Footnotes
- F1
NET
transaction
Derivative
Class B Common Stock
Conversion of derivative security
- Transaction value
- Shares
- -10,000
- Change %
- -53%
- Price
- $0.000000*
- Shares after
- 8,925
- Date
- 17 Aug 2026
- Ownership
- Direct
- Underlying class
- Class A Common Stock
- Underlying amount
- 10,000
- Exercise price
- Footnotes
- F1
NET
holding
Derivative
Class B Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 150,000
- Date
- 17 Aug 2026
- Ownership
- See footnote
- Underlying class
- Class A Common Stock
- Underlying amount
- 150,000
- Exercise price
- Footnotes
- F1, F12
NET
holding
Derivative
Class B Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 46,100
- Date
- 17 Aug 2026
- Ownership
- See footnote
- Underlying class
- Class A Common Stock
- Underlying amount
- 46,100
- Exercise price
- Footnotes
- F1, F13
NET
holding
Derivative
Class B Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 46,100
- Date
- 17 Aug 2026
- Ownership
- See footnote
- Underlying class
- Class A Common Stock
- Underlying amount
- 46,100
- Exercise price
- Footnotes
- F1, F14
NET
holding
Derivative
Class B Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 46,100
- Date
- 17 Aug 2026
- Ownership
- See footnote
- Underlying class
- Class A Common Stock
- Underlying amount
- 46,100
- Exercise price
- Footnotes
- F1, F15
* 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 15 footnotes
Footnote F1
Each 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.
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 $304.65 to $305.59, 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 $305.73 to $306.70, 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 $306.79 to $307.78, 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 $307.83 to $308.77, 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 $308.90 to $309.27, 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 $311.88 to $312.76, 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 $314.61 to $314.61, 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
Shares subject to the option are fully vested and immediately exercisable.
Footnote F12
The shares are held of record by Center Court Partners Ltd., for which the reporting person serves as a partner.
Footnote F13
The shares are held of record by Center Court 2020 Trust 1 dated December 11, 2020, for which the reporting person serves as trustee.
Footnote F14
The shares are held of record by Center Court 2020 Trust 2 dated December 11, 2020, for which the reporting person serves as trustee.
Footnote F15
The shares are held of record by Center Court 2020 Trust 3 dated December 11, 2020, for which the reporting person serves as trustee.