Fastly, Inc.
US ˙ NasdaqGS ˙ US31188V1008

SecurityFSLY / Fastly, Inc.
InstitutionXTX Topco Ltd
Latest Disclosed Ownership115,245 shares
Latest Disclosed Value $ 3,349,020
XTX Topco Ltd reports 191.46% increase in ownership of FSLY / Fastly, Inc.

On May 15, 2026 - XTX Topco Ltd filed a 13F-HR form disclosing ownership of 115,245 shares of Fastly, Inc. (US:FSLY) valued at $3,349,020 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 39,541 shares of Fastly, Inc.. This represents a change in shares of 191.46% during the quarter. The current value of the position is $2,294,528 USD.

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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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)
2026-05-15 2026-03-31 13F FASTLY CL A 31188V100 115,245 75,704 191.46 3,349 733.08 0.0582
2026-02-17 2025-12-31 13F FASTLY CL A 31188V100 39,541 39,541 403 0.0106
2025-11-14 2025-09-30 13F FASTLY CL A 31188V100 0 -14,973 -100.00 0 -100.00
2025-08-12 2025-06-30 13F FASTLY CL A 31188V100 14,973 14,973 106 0.0044
2025-02-13 2024-12-31 13F FASTLY CL A 31188V100 0 -52,806 -100.00 0 -100.00
2024-11-14 2024-09-30 13F FASTLY CL A 31188V100 52,806 52,806 400 0.0289
2023-11-13 2023-09-30 13F FASTLY CL A 31188V100 0 -13,016 -100.00 0 -100.00
2023-08-14 2023-06-30 13F FASTLY CL A 31188V100 13,016 13,016 205 0.0368
2023-05-12 2023-03-31 13F FASTLY CL A 31188V100 0 -39,076 -100.00 0 -100.00
2023-02-14 2022-12-31 13F FASTLY CL A 31188V100 39,076 39,076 320 0.0679
2022-02-11 2021-12-31 13F FASTLY CL A 31188V100 0 -14,861 -100.00 0 -100.00
2021-11-12 2021-09-30 13F FASTLY CL A 31188V100 14,861 14,861 601 0.2019
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.