[Form 4] Fastly, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Fastly, Inc. CEO and director Charles Lacey Compton III reported several transactions in the company’s Class A Common Stock. On March 4, 2026, he completed three open-market sales totaling 73,206 shares, executed under a Rule 10b5-1 trading plan adopted on August 27, 2025.

The sales occurred at weighted average prices of $20.33, $21.01 and $21.06 per share, with actual trade prices ranging from $19.89 to $21.19. A portion of the shares was sold to satisfy tax obligations related to vesting of previously granted restricted stock units. After the last sale, he held 875,831 shares directly.

On the same date, he received a grant of 373,641 restricted stock units (RSUs) at a price of $0.00 per unit, increasing his directly held equity to 1,249,472 shares on a settled basis. Each RSU represents one share of Class A Common Stock. All RSUs are initially unvested: 8.33% (one-twelfth) will vest on May 15, 2026, and the remaining RSUs will vest in 11 equal quarterly installments in August, November, February and May, subject to his continued service with Fastly.

Insider Trade Summary

Net Seller: 73,206 shares ($1,532,617)

Net Sell 4 txns

Insider Compton Charles Lacey III

Role CEO

Sold 73,206 shs ($1.53M)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock	12,357	$20.33	$251K
Sale	Class A Common Stock	1,625	$21.01	$34K
Sale	Class A Common Stock	59,224	$21.06	$1.25M
Grant/Award	Class A Common Stock	373,641	$0.00	--

Holdings After Transaction: Class A Common Stock — 936,680 shares (Direct)

Footnotes (1)

1. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 27, 2025. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.89 to $20.87, 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 (2) and (3) to this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.92 to $21.19, inclusive. Shares sold to satisfy tax obligations in connection with the vesting of previously granted Restricted Stock Units. The shares are represented by restricted stock units (RSUs). Each RSU represents a contingent right to receive one share of the Issuer's Class A Common Stock upon settlement. 100% of the RSUs are initially subject to vesting. One-twelfth (8.33%) of the total RSUs will vest on May 15, 2026 and the remainder will vest in 11 equal quarterly installments (August, November, February and May) of one-twelfth thereafter (8.33% of the total RSUs will vest per quarter), in each case subject to the Reporting Person's continued service with the Issuer through each applicable vesting date.

Form 4 Insider Transactions: What Each Field Means →

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 CA 94107

(City) (State) (Zip)

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

3. Date of Earliest Transaction (Month/Day/Year)
03/04/2026

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

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

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

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	03/04/2026		S(1)		12,357	D	$20.33(2)	936,680	D
Class A Common Stock	03/04/2026		S(1)		1,625	D	$21.01(3)	935,055	D
Class A Common Stock	03/04/2026		S(4)		59,224	D	$21.06	875,831	D
Class A Common Stock	03/04/2026		A		373,641(5)	A	$0	1,249,472	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. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 27, 2025.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.89 to $20.87, 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 (2) and (3) to this Form 4.

3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.92 to $21.19, inclusive.

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

5. The shares are represented by restricted stock units (RSUs). Each RSU represents a contingent right to receive one share of the Issuer's Class A Common Stock upon settlement. 100% of the RSUs are initially subject to vesting. One-twelfth (8.33%) of the total RSUs will vest on May 15, 2026 and the remainder will vest in 11 equal quarterly installments (August, November, February and May) of one-twelfth thereafter (8.33% of the total RSUs will vest per quarter), in each case subject to the Reporting Person's continued service with the Issuer through each applicable vesting date.

Remarks:

	/s/ Tara Seracka, Attorney-in-Fact	03/05/2026
	** 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).
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