Fastly CEO sells 45,750 shares Aug. 18–19

Fastly, Inc. (FSLY) reported that CEO and director Charles Lacey Compton III sold a total of 45,750 shares of Class A Common Stock in open-market transactions on August 18–19, 2026.

Rhea-AI Filing Summary

Fastly, Inc. (FSLY) reported that CEO and director Charles Lacey Compton III sold a total of 45,750 shares of Class A Common Stock in open-market transactions on August 18–19, 2026. Of these, 34,552 shares on August 18 were sold to satisfy tax obligations related to vesting Restricted Stock Units.

Additional sales on August 19 totaled 11,198 shares at weighted average prices reported around the mid‑$20 range per share. The filing states that the August 19 sales were effected pursuant to a Rule 10b5-1 trading plan adopted on August 27, 2025.

Insider Trade Summary 10b5-1

Net Seller: 45,750 shares

Net Sell 4 txns

Insider Compton Charles Lacey III

Role CEO

Sold 45,750 shs ($1.26M)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock F3, F4	5,098	$24.08	$123K
Sale	Class A Common Stock F3, F5	5,400	$25.08	$135K
Sale	Class A Common Stock F3, F6	700	$26.05	$18K
Sale	Class A Common Stock F1, F2	34,552	$28.60	$988K

Holdings After Transaction: Class A Common Stock — 984,842 shares (Direct)

Footnotes (6)

1. F1. Shares sold to satisfy tax obligations in connection with the vesting of previously granted Restricted Stock Units.
2. F2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $28.60 to $29.11, 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), (4), (5) and (6) to this Form 4.
3. F3. 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.
4. F4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.63 to $24.62, 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 $24.64 to $25.57, inclusive.
6. F6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.70 to $26.30, inclusive.

Key Figures

Total shares sold: 45,750 shares Tax-related sale shares: 34,552 shares Sale on 2026-08-18 price: $28.60 per share +4 more

7 metrics

Total shares sold 45,750 shares Aggregate net-sell activity reported across four Class A Common Stock transactions

Tax-related sale shares 34,552 shares Shares sold on August 18, 2026 to satisfy tax obligations from RSU vesting

Sale on 2026-08-18 price $28.60 per share Weighted average price for 34,552-share sale on August 18, 2026

Sale on 2026-08-19 price leg 1 $24.08 per share Weighted average price for 5,098-share sale on August 19, 2026

Sale on 2026-08-19 price leg 2 $25.08 per share Weighted average price for 5,400-share sale on August 19, 2026

Sale on 2026-08-19 price leg 3 $26.05 per share Weighted average price for 700-share sale on August 19, 2026

Rule 10b5-1 plan adoption date August 27, 2025 Date CEO adopted trading plan governing the August 19, 2026 sales

Key Terms

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

3 terms

Rule 10b5-1 trading plan regulatory

"The sales reported in this Form 4 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.

FAQ

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

What insider activity did Fastly (FSLY) disclose for CEO Charles Lacey Compton III?

Fastly (FSLY) disclosed that CEO Charles Lacey Compton III reported four open‑market sales of Class A Common Stock on August 18–19, 2026, totaling 45,750 shares, as reflected in this Form 4 filing.

How many Fastly (FSLY) shares did the CEO sell to cover tax obligations?

The CEO sold 34,552 shares of Fastly Class A Common Stock on August 18, 2026 to satisfy tax obligations in connection with the vesting of previously granted Restricted Stock Units, according to the Form 4 footnote.

What total number of Fastly (FSLY) shares did the CEO sell in this Form 4?

Across all reported transactions, the CEO sold 45,750 shares of Fastly Class A Common Stock. This total comes from the Form 4 transaction summary, which shows net-sell activity of 45,750 shares.

Were the Fastly (FSLY) CEO’s August 19, 2026 sales under a Rule 10b5-1 plan?

Yes. A footnote states that the sales reported in this Form 4 on August 19, 2026 were effected pursuant to a Rule 10b5‑1 trading plan adopted by the CEO on August 27, 2025.

At what prices did the Fastly (FSLY) CEO’s shares sell in these transactions?

Reported weighted average prices were $28.60 per share for the August 18, 2026 sale, and $24.08, $25.08, and $26.05 per share for the three August 19, 2026 sales. Footnotes note that each leg includes multiple trades within specified price ranges.

Does the Form 4 state the CEO’s Fastly (FSLY) holdings after these sales?

No resulting share balances are provided in the non‑derivative transaction rows; the total_shares_following_transaction fields for these sales are blank in the structured data, so post‑transaction holdings are not specified here.

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

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Accepted by SEC EDGAR 08/20/2026 - 05:01 PM EDT 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)
08/18/2026

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	08/18/2026		S(1)		34,552	D	$28.6(2)	996,040	D
Class A Common Stock	08/19/2026		S(3)		5,098	D	$24.08(4)	990,942	D
Class A Common Stock	08/19/2026		S(3)		5,400	D	$25.08(5)	985,542	D
Class A Common Stock	08/19/2026		S(3)		700	D	$26.05(6)	984,842	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 $28.60 to $29.11, 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), (4), (5) and (6) to this Form 4.

3. 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.

4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.63 to $24.62, inclusive.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.64 to $25.57, inclusive.

6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.70 to $26.30, inclusive.

Remarks:

	/s/ Tara Seracka, Attorney-in-Fact	08/20/2026
	** 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)