Fastly (FSLY) officer files Form 4 detailing December stock sales

Rhea-AI Filing Summary

Fastly, Inc. officer and President, Go to Market reported sales of Class A common stock. On December 16, 2025, the reporting person sold 34,517 shares at a weighted average price of $10.15, leaving 1,044,255 shares beneficially owned. On December 17, 2025, the reporting person sold an additional 42,118 shares at a weighted average price of $10.10, leaving 1,002,137 shares beneficially owned.

The filing explains that the first sale was made to satisfy tax obligations related to the vesting of previously granted restricted stock units. It also states that the second sale was executed under a Rule 10b5-1 trading plan adopted on February 28, 2025, which is a pre-arranged plan for trading the company’s shares.

Insider Trade Summary

Net Seller: 76,635 shares ($775,739)

Net Sell 2 txns

Insider Lovett Scott R.

Role President, Go to Market

Sold 76,635 shs ($776K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock	42,118	$10.10	$425K
Sale	Class A Common Stock	34,517	$10.15	$350K

Holdings After Transaction: Class A Common Stock — 1,002,137 shares (Direct)

Footnotes (1)

1. Shares sold to satisfy tax obligations in connection with the vesting of previously granted Restricted Stock Units. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.15 to $10.20. 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 (4) to this Form 4. The sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 28, 2025. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.99 to $10.22, inclusive.

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^*

Lovett Scott R.

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President, Go to Market

3. Date of Earliest Transaction (Month/Day/Year)
12/16/2025

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	12/16/2025		S(1)		34,517	D	$10.15(2)	1,044,255	D
Class A Common Stock	12/17/2025		S(3)		42,118	D	$10.1(4)	1,002,137	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 price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.15 to $10.20. 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 (4) to this Form 4.

3. The sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 28, 2025.

4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.99 to $10.22, inclusive.

Remarks:

	/s/ Tara Seracka, Attorney-in-Fact	12/18/2025
	** 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.

FAQ

What insider transaction did Fastly (FSLY) disclose in this Form 4?

The filing reports that a Fastly officer, serving as President, Go to Market, sold shares of Class A common stock in two separate transactions on December 16, 2025 and December 17, 2025.

How many Fastly (FSLY) shares did the insider sell and at what prices?

The reporting person sold 34,517 Class A shares on December 16, 2025 at a weighted average price of $10.15, and 42,118 shares on December 17, 2025 at a weighted average price of $10.10, based on multiple trades within stated price ranges.

How many Fastly (FSLY) shares does the insider still own after these transactions?

After the December 16, 2025 sale, the reporting person beneficially owned 1,044,255 Class A shares, and after the December 17, 2025 sale, beneficial ownership was 1,002,137 Class A shares.

Why were some of the Fastly (FSLY) shares sold by the insider?

The filing states that shares were sold to satisfy tax obligations arising from the vesting of previously granted restricted stock units.

Was a Rule 10b5-1 trading plan used for the Fastly (FSLY) insider sale?

Yes. The filing explains that one sale was effected pursuant to a Rule 10b5-1 trading plan that the reporting person adopted on February 28, 2025.

What do the weighted average prices mean in this Fastly (FSLY) Form 4?

The filing notes that the reported prices are weighted average prices because the shares were sold in multiple transactions within price ranges, and the reporting person will provide detailed trade information upon request.