Fortinet, Inc.
MX ˙ BMV ˙ US34959E1091
SecurityMX:FTNT / Fortinet, Inc.
InstitutionJanus Henderson Group Plc
Latest Disclosed Ownership76,305 shares
Latest Disclosed Value $ 6,236,026
Janus Henderson Group Plc reports 60.28% decrease in ownership of FTNT / Fortinet, Inc.

On May 18, 2026 - Janus Henderson Group Plc filed a 13F-HR/A form disclosing ownership of 76,305 shares of Fortinet, Inc. (MX:FTNT) valued at $6,236,026 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 192,120 shares of Fortinet, Inc.. This represents a change in shares of -60.28% during the quarter.

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)
2026-05-18 2026-03-31 13F/A-1 FORTINET COM 34959E109 76,305 -115,815 -60.28 6,236 -59.12 0.0030
2026-05-15 2026-03-31 13F FORTINET COM 34959E109 76,305 -115,815 6,236 0.0012
2026-02-17 2025-12-31 13F FORTINET COM 34959E109 192,120 412 0.21 15,255 -5.36 0.0068
2025-11-14 2025-09-30 13F FORTINET COM 34959E109 191,708 113,943 146.52 16,119 96.12 0.0074
2025-08-14 2025-06-30 13F FORTINET COM 34959E109 77,765 -3,402 -4.19 8,219 4.85 0.0040
2025-05-15 2025-03-31 13F FORTINET COM 34959E109 81,167 1,303 1.63 7,839 3.87 0.0043
2025-02-14 2024-12-31 13F FORTINET COM 34959E109 79,864 -743 -0.92 7,547 20.75 0.0038
2024-11-14 2024-09-30 13F FORTINET COM 34959E109 80,607 -1,800 -2.18 6,251 25.88 0.0032
2024-08-14 2024-06-30 13F FORTINET COM 34959E109 82,407 -4,931 -5.65 4,966 -16.75 0.0027
2024-05-15 2024-03-31 13F FORTINET COM 34959E109 87,338 -1,890 -2.12 5,964 14.21 0.0033
2024-02-14 2023-12-31 13F FORTINET COM 34959E109 89,228 -35,701 -28.58 5,223 -28.76 0.0031
2023-11-14 2023-09-30 13F FORTINET COM 34959E109 124,929 28,530 29.60 7,330 0.58 0.0048
2023-08-14 2023-06-30 13F FORTINET COM 34959E109 96,399 -29,666 -23.53 7,288 -13.00 0.0045
2023-05-15 2023-03-31 13F FORTINET COM 34959E109 126,065 39,323 45.33 8,378 97.57 0.0055
2023-02-14 2022-12-31 13F FORTINET COM 34959E109 86,742 -61,421 -41.46 4,240 -41.74 0.0030
2023-01-13 2022-09-30 13F/A-1 FORTINET COM 34959E109 148,163 55,108 59.22 7,278 38.15 0.0055
2022-11-14 2022-09-30 13F FORTINET COM 34959E109 148,163 55,108 7,278 0.0054
2022-08-15 2022-06-30 13F FORTINET COM 34959E109 93,055 -13,756 -12.88 5,268 -85.57 0.0036
2022-05-16 2022-03-31 13F FORTINET COM 34959E109 106,811 -39,362 -26.93 36,499 -30.53 0.0176
2022-02-14 2021-12-31 13F FORTINET COM 34959E109 146,173 98,627 207.43 52,537 278.43 0.0219
2021-11-16 2021-09-30 13F FORTINET COM 34959E109 47,546 -17,292 -26.67 13,883 -10.10 0.0061
2021-08-16 2021-06-30 13F FORTINET COM 34959E109 64,838 20,017 44.66 15,443 86.80 0.0066
2021-05-17 2021-03-31 13F FORTINET COM 34959E109 44,821 -7,754 -14.75 8,267 5.89 0.0038
2021-02-16 2020-12-31 13F FORTINET COM 34959E109 52,575 -96,689 -64.78 7,807 -55.60 0.0036
2020-11-16 2020-09-30 13F FORTINET COM 34959E109 149,264 3,688 2.53 17,582 -12.01 0.0092
2020-08-14 2020-06-30 13F FORTINET COM 34959E109 145,576 -70,265 -32.55 19,982 -8.49 0.0112
2020-05-14 2020-03-31 13F FORTINET COM 34959E109 215,841 -90,257 -29.49 21,836 -33.18 0.0150
2020-02-18 2019-12-31 13F FORTINET COM 34959E109 306,098 -963,896 -75.90 32,678 -66.48 0.0167
2019-11-14 2019-09-30 13F FORTINET COM 34959E109 1,269,994 -819,908 -39.23 97,485 -39.29 0.0528
2019-07-31 2019-06-30 13F FORTINET COM 34959E109 2,089,902 -225,558 -9.74 160,567 -17.42 0.0874
2019-04-30 2019-03-31 13F FORTINET COM 34959E109 2,315,460 -56,635 -2.39 194,428 16.38 0.1078
2019-02-06 2018-12-31 13F FORTINET COM 34959E109 2,372,095 1,298,454 120.94 167,067 68.64 0.1065
2018-11-09 2018-09-30 13F FORTINET COM 34959E109 1,073,641 462,176 75.59 99,065 159.51 0.0529
2018-08-10 2018-06-30 13F FORTINET COM 34959E109 611,465 530,500 655.22 38,174 779.99 0.0218
2018-05-14 2018-03-31 13F FORTINET COM 34959E109 80,965 51,900 178.57 4,338 241.57 0.0026
2018-03-12 2017-12-31 13F/A-1 FORTINET COM 34959E109 29,065 -1,400 -4.60 1,270 16.30 0.0008
2018-02-09 2017-12-31 13F FORTINET COM 34959E109 29,065 -1,400 1,270
2017-11-14 2017-09-30 13F FORTINET COM 34959E109 30,465 0 0.00 1,092 -4.29 0.0007
2017-08-17 2017-06-30 13F/A-1 FORTINET COM 34959E109 30,465 17,018 126.56 1,141 121.12 0.0008
2017-08-14 2017-06-30 13F FORTINET COM 34959E109 30,465 17,018 1,141
2017-05-03 2017-03-31 13F FORTINET COM 34959E109 13,447 0 0.00 516 27.41 0.0036
2017-01-30 2016-12-31 13F FORTINET COM 34959E109 13,447 2,000 17.47 405 -4.26 0.0030
2016-10-24 2016-09-30 13F FORTINET COM 34959E109 11,447 0 0.00 423 16.85 0.0031
2016-07-29 2016-06-30 13F FORTINET COM 34959E109 11,447 0 0.00 362 3.13 0.0030
2016-05-12 2016-03-31 13F FORTINET COM 34959E109 11,447 0 0.00 351 -1.68 0.0028
2016-02-03 2015-12-31 13F FORTINET COM 34959E109 11,447 11,447 357 0.0029
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.