Cloudflare officer plans $3.2M stock sale

An officer of Cloudflare plans to sell 10,000 shares of NET via stock option exercise, following prior sales under a 10b5-1 plan.

Available on EDGAR 09/17/2026 - 04:32 PM EDT Accepted by SEC EDGAR 09/17/2026 - 04:32 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Cloudflare, Inc. (NET) has a notice of proposed sale under Rule 144 for common stock held for the account of officer Thomas Seifert. The filing lists a planned sale of 10,000 shares of common stock, with an aggregate market value of $3,246,500, expected around September 17, 2026, through Morgan Stanley Smith Barney via cash exercise of stock options. It also discloses several earlier sales under a 10b5-1 plan during July and August 2026.

Key Figures

Planned shares to be sold: 10,000 shares Aggregate market value of planned sale: $3,246,500 Shares outstanding: 322,618,775 shares +5 more

8 metrics

Planned shares to be sold 10,000 shares Common stock sale planned around September 17, 2026 under Rule 144

Aggregate market value of planned sale $3,246,500 Value associated with the planned sale of 10,000 shares

Shares outstanding 322,618,775 shares Cloudflare common stock outstanding referenced in the notice

Shares sold on August 17, 2026 10,000 shares 10b5-1 Sales Plan transaction for Thomas Seifert

Value of August 17, 2026 sale $3,073,176 Common stock sold under 10b5-1 Sales Plan

Shares sold on August 4, 2026 55,000 shares Common stock sale under 10b5-1 Sales Plan

Value of August 4, 2026 sale $16,516,285.50 Common stock sold under 10b5-1 Sales Plan

Shares sold on July 17, 2026 10,000 shares Common stock sale under 10b5-1 Sales Plan

Key Terms

Rule 144, 10b5-1 Sales Plan, Exercise of Stock Options

3 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

10b5-1 Sales Plan regulatory

"10b5-1 Sales Plan for THOMAS SEIFERT 101 Townsend Street San Francisco"

A 10b5-1 sales plan is a written, prearranged schedule that company insiders use to buy or sell their employer’s stock under a U.S. securities rule, so trades occur automatically at set times or prices regardless of later private information. It matters to investors because it reduces the risk of insider-trading accusations and signals that certain insider trades were planned ahead—like putting transactions on autopilot—while still affecting share supply and market confidence.

Exercise of Stock Options financial

"Common | 09/17/2026 | Exercise of Stock Options | Issuer"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does Cloudflare (NET)’s latest Form 144 filing disclose?

It discloses a planned sale under Rule 144 for 10,000 shares of Cloudflare common stock for the account of officer Thomas Seifert, with an aggregate market value of $3,246,500, expected around September 17, 2026.

How many Cloudflare (NET) shares are planned to be sold and how will they be acquired?

The filing reports a planned sale of 10,000 shares of Cloudflare common stock. These shares are to be obtained on September 17, 2026 via exercise of stock options from the issuer for cash, then sold through Morgan Stanley Smith Barney.

What past 3‑month sales by Thomas Seifert in Cloudflare (NET) are disclosed?

The notice lists 10b5-1 plan sales of 10,000 shares on August 17, 2026 for $3,073,176, 55,000 shares on August 4, 2026 for $16,516,285.50, and 10,000 shares on July 17, 2026 for $2,769,195.

How many Cloudflare (NET) shares are outstanding as cited in the Form 144?

The filing cites 322,618,775 shares of Cloudflare common stock outstanding, in connection with the calculation for the Rule 144 notice related to the planned 10,000‑share sale.

Which broker is named for the planned Cloudflare (NET) share sale?

The planned sale of 10,000 shares of Cloudflare common stock is listed through Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY 10004.

Is the planned Cloudflare (NET) sale tied to a 10b5-1 plan?

The past three months’ sales are described as under a 10b5-1 Sales Plan for Thomas Seifert. The planned 10,000‑share sale on September 17, 2026 is identified as from exercise of stock options; the text does not label it as a 10b5-1 trade.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001473289
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Cloudflare, Inc.
SEC File Number	001-39039
Address of Issuer	101 Townsend Street San Francisco CALIFORNIA 94107
Phone	8889935273
Name of Person for Whose Account the Securities are To Be Sold	THOMAS SEIFERT
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	10000	3246500.00	322618775	09/17/2026	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	09/17/2026	Exercise of Stock Options	Issuer			10000	09/17/2026	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales Plan for THOMAS SEIFERT 101 Townsend Street San Francisco CA 94107	Common	08/17/2026	10000	3073176.00
10b5-1 Sales Plan for THOMAS SEIFERT 101 Townsend Street San Francisco CA 94107	Common	08/04/2026	55000	16516285.50
10b5-1 Sales Plan for THOMAS SEIFERT 101 Townsend Street San Francisco CA 94107	Common	07/17/2026	10000	2769195.00

144: Remarks and Signature

Remarks
Date of Notice	09/17/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	11/20/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Thomas J Seifert
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)