Cover	12 Months Ended
Cover	Dec. 31, 2023
Document Information [Line Items]
Document Type	DEF 14A
Amendment Flag	false
Entity Information [Line Items]
Entity Registrant Name	FASTLY, INC.
Entity Central Index Key	0001517413

Pay vs Performance Disclosure - USD ($)

2 Months Ended

4 Months Ended

8 Months Ended

10 Months Ended

12 Months Ended

Feb. 18, 2020

Dec. 31, 2022

Aug. 31, 2022

Dec. 31, 2020

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

Dec. 31, 2020

Pay vs Performance Disclosure

Pay vs Performance Disclosure, Table

Pay vs. Performance

As required by Item 402(v) of Regulation S-K, we are providing the following information about the relationship between executive compensation actually paid and certain financial performance measures of the Company. In accordance with applicable SEC rules, the adjustments described and quantified below were made to the values reported in the Summary Compensation table for each applicable year to determine the “actual” compensation paid to our Principal Executive Officers (“PEOs”) and the average “actual” compensation paid to our other Named Executive Officers (or “NEOs”). For further information concerning the Company’s variable pay-for-performance philosophy and how the Company aligns executive compensation with the Company’s performance, refer to “Executive Compensation – Compensation Discussion and Analysis.”

The following table summarizes compensation values reported in the Summary Compensation Table for our PEO and the average for our other NEOs, as compared to “compensation actually paid” or “CAP” and the Company’s financial performance for the years ended December 31, 2023, 2022, 2021, and 2020:

Year	Summary Compensation Table Total for Artur Bergman(1)	Compensation Actually Paid to Artur Bergman(1)(2)	Summary Compensation Table Total for Joshua Bixby(1)	Compensation Actually Paid to Joshua Bixby(1)(2)	Summary Compensation Table Total for PEO (Todd Nightingale)(1)	Compensation Actually Paid to Todd Nightingale(1)(2)	Average Summary Compensation Table Total for Non-PEO NEOs(3)	Average Compensation Actually Paid to Non-PEO NEOs(3)(4)	Value of Initial Fixed $100 Investment Based On:		Net Income (millions)	Revenue (millions)(6)
Year	Summary Compensation Table Total for Artur Bergman(1)	Compensation Actually Paid to Artur Bergman(1)(2)	Summary Compensation Table Total for Joshua Bixby(1)	Compensation Actually Paid to Joshua Bixby(1)(2)		Compensation Actually Paid to Todd Nightingale(1)(2)		Average Compensation Actually Paid to Non-PEO NEOs(3)(4)	Total Shareholder Return	Peer Group Total Shareholder Return(5)	Net Income (millions)	Revenue (millions)(6)
(a)	(b)	(c)	(b)	(c)	(b)	(c)	(d)	(e)	(f)	(g)	(h)	(i)
2023	—	—	—	—	$10,165,468	$36,942,933	$6,867,702	$12,229,373	$88.69	$210.85	$(133.1)	$506.0
2022	—	—	$9,199,127	$(3,892,017)	$21,857,756	$20,179,714	$4,066,505	$(2,381,573)	$40.81	$134.82	$(190.8)	$432.7
2021	—	—	$10,151,111	$(12,802,716)	—	—	$7,088,904	$(1,602,130)	$176.63	$189.64	$(222.7)	$354.3
2020	$6,767,258	$38,184,386	$8,049,162	$52,180,083	—	—	$3,816,864	$19,287,475	$435.33	$142.21	$(95.9)	$290.9

(1)

The dollar amounts reported in columns (b) are the amounts reported for Messrs. Bergman, Bixby and Nightingale, respectively, for each corresponding year in the “Total” column of the Summary Compensation Table. Mr. Bergman served as our Chief Executive Officer in 2020 through February 18, 2020, after which time he became our Chief Architect and Executive Chairperson. Mr. Bergman resigned from his role as Executive Chairperson effective April 2023. Mr. Bergman became our Chief Technology Officer in April 2024. Mr. Bixby served as our Chief Executive Officer effective February 19, 2020 through August 31, 2022. Mr. Nightingale has served as our CEO since September 1, 2022. The following individuals served as our PEOs for the following years:

2023: Todd Nightingale

2022: Joshua Bixby, Todd Nightingale

2021: Joshua Bixby

2020: Artur Bergman, Joshua Bixby

(2)

The dollar amounts reported in columns (c) represent the amount of CAP for Messrs. Bergman, Bixby, and Nightingale, respectively as computed in accordance with Item 402(v) of Regulation S-K. The dollar amounts do not reflect the actual amount of compensation earned by or paid during the applicable year. The Company deducted from and added to the Summary Compensation Table total compensation the following amounts to calculate compensation actually paid in accordance with Item 402(v) of Regulation S-K as disclosed in columns (c) and (e) for our PEO and Non-PEO NEOs in each respective year. As the Company’s NEOs do not participate in any defined benefit plans, no adjustments were required to amounts reported in the Summary Compensation Table totals related to the value of benefits under such plans. There are no material differences between the assumptions used to compute the valuation of the equity awards for calculating the compensation actually paid from the assumptions used to compute the valuation of such equity awards as of the grant date.

	2023		2022			2021		2020
	Todd Nightingale	Average Non-PEO NEOs	Todd Nightingale	Joshua Bixby	Average Non-PEO NEOs	Joshua Bixby	Average Non-PEO NEOs	Joshua Bixby	Artur Bergman	Average Non-PEO NEOs
Total Compensation from Summary Compensation Table	$10,165,468	$6,867,702	$21,857,756	$9,199,127	$4,066,505	$10,151,111	$7,088,904	$8,049,162	$6,767,258	$3,816,864
Adjustments for Equity Awards
Grant date values in the Summary Compensation Table	-$8,978,088	-$6,160,954	-$20,514,116	-$8,693,058	-$3,413,192	-$9,618,134	-$6,566,179	-$7,630,888	-$6,139,403	-$3,108,033
Year-end fair value of unvested awards granted in the current year	$12,012,366	$8,733,232	$17,440,430	$2,475,829	$1,422,184	$3,480,020	$3,051,217	$17,168,729	$12,525,014	$7,009,724

	2023		2022			2021		2020
	Todd Nightingale	Average Non-PEO NEOs	Todd Nightingale	Joshua Bixby	Average Non-PEO NEOs	Joshua Bixby	Average Non-PEO NEOs	Joshua Bixby	Artur Bergman	Average Non-PEO NEOs
Year-over-year difference of year-end fair values for unvested awards granted in prior years	$15,809,027	$1,261,639	$0	-$2,985,352	-$2,504,587	-$12,631,447	-$3,455,201	$22,005,767	$14,014,350	$5,408,818
Fair values at vest date for awards granted and vested in current year	$897,541	$832,627	$1,395,644	$445,932	$303,043	$793,071	$596,255	$6,473,673	$5,520,156	$3,978,822
Difference in fair values between prior year-end fair values and vest date fair values for awards granted in prior years	$7,036,619	$1,270,861	$0	-$2,664,091	-$1,221,449	-$4,977,337	-$2,317,126	$6,113,639	$5,497,011	$2,181,281
Forfeitures during current year equal to prior year-end fair value	$0	-$575,734	$0	-$1,670,404	-$1,034,077	$0	$0	$0	$0	$0
Dividends or dividend equivalents not otherwise included in the total compensation	$0	$0	$0	$0	$0	$0	$0	$0	$0	$0
Total Adjustments for Equity Awards	$35,755,553	$11,522,625	$18,836,074	-$4,398,086	-$3,034,886	-$13,335,693	-$2,124,855	$51,761,809	$37,556,531	$18,578,644
Compensation Actually Paid (as calculated)	$36,942,933	$12,229,373	$20,179,714	-$3,892,017	-$2,381,573	-$12,802,716	-$1,602,130	$52,180,083	$38,184,386	$19,287,475

(3)

The dollar amounts reported in column (d) represent the average of the amounts reported for the Company’s NEOs as a group (excluding our PEOs) in the “Total” column of the Summary Compensation Table Total in each applicable year. The following individuals were our Non-PEO NEOs in the respective years:

2023: Artur Bergman, Ronald Kisling, and Brett Shirk

2022: Artur Bergman, Ronald Kisling, Paul Luongo, and Brett Shirk

2021: Artur Bergman, Adriel Lares, Ron Kisling, Paul Luongo, and Brett Shirk

2020: Adriel Lares, Paul Luongo, and Wolfgang Maasberg

(4)

The dollar amounts reported in column (e) represent the average amount of CAP to the non-PEO NEOs as a group, as computed in accordance with Item 402(v) of Regulation S-K. The dollar amounts do not reflect the actual average amount of compensation earned by or paid to the Non-PEO NEOs as a group during the applicable year. In accordance with the requirements of Item 402(v) of Regulation S-K, adjustments were made to average total reported compensation for the Non-PEO NEOs as a group for each year to determine the CAP, using the methodology described above in Note 2.

(5)	The peer group is the following published industry index: S&P 500 Information Technology Index.

(6)

While the Company uses numerous financial and non-financial performance measures for the purpose of evaluating performance for the Company’s compensation programs, the Company has determined that Revenue is the financial performance measure that, in the Company’s assessment, represents the most important performance measure (that is not otherwise required to be disclosed in the table) used by the Company to link compensation actually paid to the Company’s NEOs, for the most recently completed fiscal year, to Company performance.

Company Selected Measure Name

Revenue

Named Executive Officers, Footnote

(1)

2023: Todd Nightingale

2022: Joshua Bixby, Todd Nightingale

2021: Joshua Bixby

2020: Artur Bergman, Joshua Bixby

(3)

2023: Artur Bergman, Ronald Kisling, and Brett Shirk

2022: Artur Bergman, Ronald Kisling, Paul Luongo, and Brett Shirk

2021: Artur Bergman, Adriel Lares, Ron Kisling, Paul Luongo, and Brett Shirk

2020: Adriel Lares, Paul Luongo, and Wolfgang Maasberg

Peer Group Issuers, Footnote

(5)	The peer group is the following published industry index: S&P 500 Information Technology Index.

Adjustment To PEO Compensation, Footnote

(2)

	2023		2022			2021		2020
	Todd Nightingale	Average Non-PEO NEOs	Todd Nightingale	Joshua Bixby	Average Non-PEO NEOs	Joshua Bixby	Average Non-PEO NEOs	Joshua Bixby	Artur Bergman	Average Non-PEO NEOs
Total Compensation from Summary Compensation Table	$10,165,468	$6,867,702	$21,857,756	$9,199,127	$4,066,505	$10,151,111	$7,088,904	$8,049,162	$6,767,258	$3,816,864
Adjustments for Equity Awards
Grant date values in the Summary Compensation Table	-$8,978,088	-$6,160,954	-$20,514,116	-$8,693,058	-$3,413,192	-$9,618,134	-$6,566,179	-$7,630,888	-$6,139,403	-$3,108,033
Year-end fair value of unvested awards granted in the current year	$12,012,366	$8,733,232	$17,440,430	$2,475,829	$1,422,184	$3,480,020	$3,051,217	$17,168,729	$12,525,014	$7,009,724

	2023		2022			2021		2020
	Todd Nightingale	Average Non-PEO NEOs	Todd Nightingale	Joshua Bixby	Average Non-PEO NEOs	Joshua Bixby	Average Non-PEO NEOs	Joshua Bixby	Artur Bergman	Average Non-PEO NEOs
Year-over-year difference of year-end fair values for unvested awards granted in prior years	$15,809,027	$1,261,639	$0	-$2,985,352	-$2,504,587	-$12,631,447	-$3,455,201	$22,005,767	$14,014,350	$5,408,818
Fair values at vest date for awards granted and vested in current year	$897,541	$832,627	$1,395,644	$445,932	$303,043	$793,071	$596,255	$6,473,673	$5,520,156	$3,978,822
Difference in fair values between prior year-end fair values and vest date fair values for awards granted in prior years	$7,036,619	$1,270,861	$0	-$2,664,091	-$1,221,449	-$4,977,337	-$2,317,126	$6,113,639	$5,497,011	$2,181,281
Forfeitures during current year equal to prior year-end fair value	$0	-$575,734	$0	-$1,670,404	-$1,034,077	$0	$0	$0	$0	$0
Dividends or dividend equivalents not otherwise included in the total compensation	$0	$0	$0	$0	$0	$0	$0	$0	$0	$0
Total Adjustments for Equity Awards	$35,755,553	$11,522,625	$18,836,074	-$4,398,086	-$3,034,886	-$13,335,693	-$2,124,855	$51,761,809	$37,556,531	$18,578,644
Compensation Actually Paid (as calculated)	$36,942,933	$12,229,373	$20,179,714	-$3,892,017	-$2,381,573	-$12,802,716	-$1,602,130	$52,180,083	$38,184,386	$19,287,475

Non-PEO NEO Average Total Compensation Amount

$ 6,867,702

$ 4,066,505

$ 7,088,904

$ 3,816,864

Non-PEO NEO Average Compensation Actually Paid Amount

$ 12,229,373

(2,381,573)

(1,602,130)

19,287,475

Adjustment to Non-PEO NEO Compensation Footnote

(2)

	2023		2022			2021		2020
	Todd Nightingale	Average Non-PEO NEOs	Todd Nightingale	Joshua Bixby	Average Non-PEO NEOs	Joshua Bixby	Average Non-PEO NEOs	Joshua Bixby	Artur Bergman	Average Non-PEO NEOs
Total Compensation from Summary Compensation Table	$10,165,468	$6,867,702	$21,857,756	$9,199,127	$4,066,505	$10,151,111	$7,088,904	$8,049,162	$6,767,258	$3,816,864
Adjustments for Equity Awards
Grant date values in the Summary Compensation Table	-$8,978,088	-$6,160,954	-$20,514,116	-$8,693,058	-$3,413,192	-$9,618,134	-$6,566,179	-$7,630,888	-$6,139,403	-$3,108,033
Year-end fair value of unvested awards granted in the current year	$12,012,366	$8,733,232	$17,440,430	$2,475,829	$1,422,184	$3,480,020	$3,051,217	$17,168,729	$12,525,014	$7,009,724

	2023		2022			2021		2020
	Todd Nightingale	Average Non-PEO NEOs	Todd Nightingale	Joshua Bixby	Average Non-PEO NEOs	Joshua Bixby	Average Non-PEO NEOs	Joshua Bixby	Artur Bergman	Average Non-PEO NEOs
Year-over-year difference of year-end fair values for unvested awards granted in prior years	$15,809,027	$1,261,639	$0	-$2,985,352	-$2,504,587	-$12,631,447	-$3,455,201	$22,005,767	$14,014,350	$5,408,818
Fair values at vest date for awards granted and vested in current year	$897,541	$832,627	$1,395,644	$445,932	$303,043	$793,071	$596,255	$6,473,673	$5,520,156	$3,978,822
Difference in fair values between prior year-end fair values and vest date fair values for awards granted in prior years	$7,036,619	$1,270,861	$0	-$2,664,091	-$1,221,449	-$4,977,337	-$2,317,126	$6,113,639	$5,497,011	$2,181,281
Forfeitures during current year equal to prior year-end fair value	$0	-$575,734	$0	-$1,670,404	-$1,034,077	$0	$0	$0	$0	$0
Dividends or dividend equivalents not otherwise included in the total compensation	$0	$0	$0	$0	$0	$0	$0	$0	$0	$0
Total Adjustments for Equity Awards	$35,755,553	$11,522,625	$18,836,074	-$4,398,086	-$3,034,886	-$13,335,693	-$2,124,855	$51,761,809	$37,556,531	$18,578,644
Compensation Actually Paid (as calculated)	$36,942,933	$12,229,373	$20,179,714	-$3,892,017	-$2,381,573	-$12,802,716	-$1,602,130	$52,180,083	$38,184,386	$19,287,475

Compensation Actually Paid vs. Total Shareholder Return

Required Disclosure of the Relationship Between Compensation Actually Paid and Financial Performance Measures

As required by Item 402(v) of Regulation S-K, we are providing the following graphs to illustrate the relationship between the CAP and performance figures that are included in the pay versus performance tabular disclosure above. In addition, the first graph below further illustrates the relationship between Company total shareholder return and that of the S&P 500 Information Technology Index. As noted above, CAP for purposes of the tabular disclosure and the following graphs were calculated in accordance with SEC rules and do not fully represent the actual final amount of compensation earned by or actually paid to our NEOs during the applicable years.

CAP and Cumulative TSR / Cumulative TSR of the Peer Group

Compensation Actually Paid vs. Net Income

Required Disclosure of the Relationship Between Compensation Actually Paid and Financial Performance Measures

CAP and Net Income

Compensation Actually Paid vs. Company Selected Measure

Required Disclosure of the Relationship Between Compensation Actually Paid and Financial Performance Measures

CAP and Revenue

Total Shareholder Return Vs Peer Group

Required Disclosure of the Relationship Between Compensation Actually Paid and Financial Performance Measures

CAP and Cumulative TSR / Cumulative TSR of the Peer Group

Tabular List, Table

Tabular List for 2023 Fiscal Year

As described in greater detail in “Executive Compensation – Compensation Discussion and Analysis,” the Company’s executive compensation program reflects a variable pay-for-performance philosophy. The metrics that the Company uses for both our long-term and short-term incentive awards are selected based on an objective of incentivizing our NEOs to increase the value of our enterprise for our stockholders. The three financial performance measures used by the Company to link executive compensation actually paid to the Company’s NEOs, for the most recently completed fiscal year, to the Company’s performance are as follows:

•

Revenue

•	Non-GAAP Operating Loss⁽¹⁾

•	Stock Price

(1)	Please refer to Appendix A of this Proxy Statement for a reconciliation of non-GAAP financial measures to their corresponding U.S. GAAP measures.

Total Shareholder Return Amount

$ 88.69

40.81

176.63

435.33

Peer Group Total Shareholder Return Amount

210.85

134.82

189.64

142.21

Net Income (Loss)

$ (133,100,000)

$ (190,800,000)

$ (222,700,000)

$ (95,900,000)

Company Selected Measure Amount

506,000,000

432,700,000

354,300,000

290,900,000

PEO Name

Artur Bergman

Todd Nightingale

Joshua Bixby

Todd Nightingale

Joshua Bixby

Additional 402(v) Disclosure

All information provided above under the “Item 402(v) Pay Versus Performance” heading will not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended, whether made before or after the date hereof and irrespective of any general incorporation language in any such filing, except to the extent the Company specifically incorporates such information by reference.

Measure:: 1