Fastly CEO sells 70K shares in 10b5-1 trades

Fastly’s CEO disclosed pre-planned open-market sales totaling 70,607 shares, including shares sold to cover tax obligations from RSU vesting.

Rhea-AI Filing Summary

Fastly, Inc. (FSLY) CEO and director Charles Lacey Compton III reported selling a total of 70,607 shares of Class A Common Stock in open-market transactions on August 31 and September 1, 2026. The sales were made under a Rule 10b5-1 trading plan, with 15,028 shares sold to satisfy tax obligations related to vesting Restricted Stock Units and the remaining shares sold at weighted-average prices between $20.59 and $22.65 per share.

Insider Trade Summary 10b5-1

Net Seller: 70,607 shares

Net Sell 4 txns

Insider Compton Charles Lacey III

Role CEO

Sold 70,607 shs ($1.53M)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock F2, F3	35,501	$21.10	$749K
Sale	Class A Common Stock F2, F4	18,978	$21.86	$415K
Sale	Class A Common Stock F2, F5	1,100	$22.61	$25K
Sale	Class A Common Stock F1	15,028	$23.00	$346K

Holdings After Transaction: Class A Common Stock — 914,235 shares (Direct)

Footnotes (5)

1. F1. Shares sold to satisfy tax obligations in connection with the vesting of previously granted Restricted Stock Units.
2. F2. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 11, 2026.
3. F3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.59 to $21.58, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (3), (4) and (5) to this Form 4.
4. F4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $21.59 to $22.51, inclusive.
5. F5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.60 to $22.65, inclusive.

Key Figures

Total shares sold: 70,607 shares Tax-related sale: 15,028 shares Sale on September 1, 2026 (tranche 1): 35,501 shares at $21.10 per share +3 more

6 metrics

Total shares sold 70,607 shares Aggregate insider sales reported for August 31 and September 1, 2026

Tax-related sale 15,028 shares Shares sold on August 31, 2026 to satisfy tax obligations from RSU vesting

Sale on September 1, 2026 (tranche 1) 35,501 shares at $21.10 per share Weighted-average price with underlying trades from $20.59 to $21.58

Sale on September 1, 2026 (tranche 2) 18,978 shares at $21.86 per share Weighted-average price with underlying trades from $21.59 to $22.51

Sale on September 1, 2026 (tranche 3) 1,100 shares at $22.61 per share Weighted-average price with underlying trades from $22.60 to $22.65

10b5-1 plan adoption date May 11, 2026 Date the CEO adopted the Rule 10b5-1 trading plan governing these sales

Key Terms

Rule 10b5-1 trading plan, Restricted Stock Units, weighted average price, tax obligations

4 terms

Rule 10b5-1 trading plan regulatory

"The sales reported ... were effected pursuant to a Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

Restricted Stock Units financial

"tax obligations in connection with the vesting of previously granted Restricted Stock Units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

weighted average price financial

"The price reported in Column 4 is a weighted average price"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

tax obligations financial

"Shares sold to satisfy tax obligations in connection with the vesting"

FAQ

What insider transactions did Fastly (FSLY) report for its CEO?

Fastly’s CEO Charles Lacey Compton III reported selling 70,607 shares of Class A Common Stock in four open-market transactions on August 31 and September 1, 2026, according to the Form 4.

Were the recent FSLY CEO share sales made under a Rule 10b5-1 plan?

Yes. The filing states the sales were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 11, 2026, and the Form 4 trading-plan checkbox is marked as affirmed.

How many FSLY shares were sold to cover tax obligations from RSU vesting?

The Form 4 discloses that 15,028 shares of Fastly Class A Common Stock were sold on August 31, 2026 to satisfy tax obligations in connection with the vesting of previously granted Restricted Stock Units.

At what prices did the Fastly (FSLY) CEO sell shares on September 1, 2026?

On September 1, 2026, the CEO sold shares at weighted-average prices of $21.10, $21.86, and $22.61 per share, with underlying transaction price ranges from $20.59–$22.65, as detailed in the Form 4 footnotes.

What is the total number of FSLY shares sold by the CEO in this Form 4?

Across all reported transactions, the CEO sold a total of 70,607 shares of Fastly Class A Common Stock, based on the transaction summary included in the Form 4 data.

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

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Available on EDGAR 09/02/2026 - 05:03 PM Accepted by SEC EDGAR 09/02/2026 - 05:03 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Compton Charles Lacey III

(Last) (First) (Middle)

C/O FASTLY, INC.

475 BRANNAN STREET, SUITE 300

(Street)

SAN FRANCISCO CALIFORNIA 94107

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Fastly, Inc. [ FSLY ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CEO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/31/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	08/31/2026		S(1)		15,028	D	$23	969,814	D
Class A Common Stock	09/01/2026		S(2)		35,501	D	$21.1(3)	934,313	D
Class A Common Stock	09/01/2026		S(2)		18,978	D	$21.86(4)	915,335	D
Class A Common Stock	09/01/2026		S(2)		1,100	D	$22.61(5)	914,235	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Shares sold to satisfy tax obligations in connection with the vesting of previously granted Restricted Stock Units.

2. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 11, 2026.

3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.59 to $21.58, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (3), (4) and (5) to this Form 4.

4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $21.59 to $22.51, inclusive.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.60 to $22.65, inclusive.

Remarks:

	/s/ Tara Seracka, Attorney-in-Fact	09/02/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)