Fastly, Inc.
US ˙ NasdaqGS ˙ US31188V1008

SecurityFSLY / Fastly, Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership108,282 shares
Latest Disclosed Value $ 3,146,674
Citigroup Inc ownership in FSLY / Fastly, Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 108,282 shares of Fastly, Inc. (US:FSLY) valued at $3,146,675 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 205,414 shares of Fastly, Inc.. This represents a change in shares of -47.29% during the quarter. The current value of the position is $2,255,514 USD.

Citigroup Inc has a history of taking positions in derivatives of the underlying security (FSLY) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD and put options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

FSLY / Fastly, Inc. Historical Put/Call Ratio
Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date
Effective
Date
Form Security Class ID Avg Price
Paid (Est)
Reported
Shares
ΔShares ΔShares
(%)
Reported
Value
(x1000)
ΔValue
(%)
Alloc
(%)
ΔAlloc ΔAlloc (%) Cost Basis
(x1000)
Unrealized
Gain/Loss
(x1000)
2026-05-11 2026-03-31 13F FASTLY CL A 31188V100 108,282 -97,132 -47.29 3,147 50.45 0.0007
2026-02-13 2025-12-31 13F FASTLY CL A 31188V100 205,414 -42,728 -17.22 2,091 -1.41 0.0009
2025-11-10 2025-09-30 13F FASTLY CL A 31188V100 248,142 -51,809 -17.27 2,122 0.19 0.0009
2025-08-11 2025-06-30 13F FASTLY CL A 31188V100 299,951 -22,850 -7.08 2,118 3.62 0.0010
2025-05-12 2025-03-31 13F FASTLY CL A 31188V100 322,801 26,978 9.12 2,043 -26.83 0.0010
2025-02-12 2024-12-31 13F FASTLY CL A 31188V100 295,823 -19,005 -6.04 2,793 17.16 0.0017
2024-11-12 2024-09-30 13F FASTLY CL A 31188V100 314,828 96,425 44.15 2,383 48.10 0.0014
2024-08-12 2024-06-30 13F FASTLY CL A 31188V100 218,403 40,068 22.47 1,610 -30.44 0.0010
2024-05-10 2024-03-31 13F FASTLY CL A 31188V100 178,335 32,454 22.25 2,313 -10.90 0.0015
2024-02-09 2023-12-31 13F FASTLY CL A 31188V100 145,881 32,641 28.82 2,597 19.63 0.0018
2023-12-06 2023-09-30 13F/A-1 FASTLY CL A 31188V100 113,240 -83,057 -42.31 2,171 -29.89 0.0016
2023-11-09 2023-09-30 13F FASTLY CL A 31188V100 113,240 -83,057 2,171 0.0006
2023-08-10 2023-06-30 13F FASTLY CL A 31188V100 196,297 -389,992 -66.52 3,096 -70.27 0.0020
2023-05-11 2023-03-31 13F FASTLY CL A 31188V100 586,289 406,451 226.01 10,412 607.34 0.0073
2023-02-09 2022-12-31 13F FASTLY CL A 31188V100 179,838 -524,354 -74.46 1,473 -77.18 0.0012
2022-11-10 2022-09-30 13F FASTLY CL A 31188V100 704,192 -117,926 -14.34 6,451 -32.41 0.0046
2022-08-10 2022-06-30 13F FASTLY CL A 31188V100 822,118 319,795 63.66 9,544 9.31 0.0071
2022-05-12 2022-03-31 13F FASTLY CL A 31188V100 502,323 144,753 40.48 8,731 -31.12 0.0053
2022-02-10 2021-12-31 13F FASTLY CL A 31188V100 357,570 -196,548 -35.47 12,676 -43.43 0.0068
2021-11-10 2021-09-30 13F FASTLY CL A 31188V100 554,118 159,785 40.52 22,408 -4.65 0.0132
2021-08-10 2021-06-30 13F FASTLY CL A 31188V100 394,333 138,141 53.92 23,501 36.35 0.0141
2021-05-13 2021-03-31 13F FASTLY CL A 31188V100 256,192 169,806 196.57 17,236 128.35 0.0111
2021-02-11 2020-12-31 13F FASTLY CL A 31188V100 86,386 -8,077 -8.55 7,548 -14.70 0.0045
2020-11-12 2020-09-30 13F FASTLY CL A 31188V100 94,463 1,153 1.24 8,849 11.41 0.0058
2020-08-12 2020-06-30 13F FASTLY CL A 31188V100 93,310 85,459 1,088.51 7,943 5,230.87 0.0062
2020-05-12 2020-03-31 13F FASTLY CL A 31188V100 7,851 6,822 662.97 149 609.52 0.0001
2020-02-12 2019-12-31 13F FASTLY CL A 31188V100 1,029 29 2.90 21 -12.50 0.0000
2019-11-08 2019-09-30 13F FASTLY CL A 31188V100 1,000 0 0.00 24 20.00 0.0000
2019-08-12 2019-06-30 13F FASTLY CL A 31188V100 1,000 1,000 20 0.0000
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2021-05-13 2021-03-31 13F FASTLY CL A Call 0 -100.00 0 -100.00 n/a n/a n/a
2021-02-11 2020-12-31 13F FASTLY CL A Call 91,400 81.35 7,986 69.16 n/a n/a n/a
2020-11-12 2020-09-30 13F FASTLY CL A Call 50,400 -16.69 4,721 -8.33 n/a n/a n/a
2020-08-12 2020-06-30 13F FASTLY CL A Call 60,500 142.00 5,150 984.21 n/a n/a n/a
2020-05-12 2020-03-31 13F FASTLY CL A Call 25,000 475 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2021-05-13 2021-03-31 13F FASTLY CL A Put 0 -100.00 0 -100.00 n/a n/a n/a
2021-02-11 2020-12-31 13F FASTLY CL A Put 158,800 156.13 13,874 138.88 n/a n/a n/a
2020-11-12 2020-09-30 13F FASTLY CL A Put 62,000 139.38 5,808 163.40 n/a n/a n/a
2020-08-12 2020-06-30 13F FASTLY CL A Put 25,900 32.82 2,205 495.95 n/a n/a n/a
2020-05-12 2020-03-31 13F FASTLY CL A Put 19,500 370 n/a n/a n/a
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.