Fortinet, Inc.
US ˙ NasdaqGS ˙ US34959E1091

SecurityFTNT / Fortinet, Inc.
InstitutionState Street Corp
Latest Disclosed Ownership28,929,635 shares
Latest Disclosed Value $ 2,364,129,772
State Street Corp reports 0.72% decrease in ownership of FTNT / Fortinet, Inc.

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 28,929,635 shares of Fortinet, Inc. (US:FTNT) valued at $2,364,129,772 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 29,140,849 shares of Fortinet, Inc.. This represents a change in shares of -0.72% during the quarter. The current value of the position is $4,237,612,935 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 FORTINET COM 34959E109 28,929,635 -211,214 -0.72 2,364,130 2.16 0.0816
2026-02-13 2025-12-31 13F FORTINET COM 34959E109 29,140,849 -519,709 -1.75 2,314,075 -7.21 0.0776
2025-11-14 2025-09-30 13F FORTINET COM 34959E109 29,660,558 477,397 1.64 2,493,860 -19.17 0.0865
2025-08-14 2025-06-30 13F FORTINET COM 34959E109 29,183,161 862,468 3.05 3,085,244 13.17 0.1156
2025-05-15 2025-03-31 13F FORTINET COM 34959E109 28,320,693 91,231 0.32 2,726,150 2.21 0.1123
2025-02-14 2024-12-31 13F FORTINET COM 34959E109 28,229,462 948,183 3.48 2,667,239 26.07 0.1052
2024-11-14 2024-09-30 13F FORTINET COM 34959E109 27,281,279 766,135 2.89 2,115,663 32.39 0.0861
2024-08-14 2024-06-30 13F FORTINET COM 34959E109 26,515,144 -285,702 -1.07 1,598,068 -12.71 0.0698
2024-05-15 2024-03-31 13F FORTINET COM 34959E109 26,800,846 198,969 0.75 1,830,766 17.58 0.0818
2024-02-14 2023-12-31 13F FORTINET COM 34959E109 26,601,877 1,041,135 4.07 1,557,008 3.81 0.0757
2023-11-14 2023-09-30 13F FORTINET COM 34959E109 25,560,742 -482,051 -1.85 1,499,904 -23.81 0.0832
2023-08-14 2023-06-30 13F FORTINET COM 34959E109 26,042,793 647,200 2.55 1,968,575 16.64 0.1034
2023-05-15 2023-03-31 13F FORTINET COM 34959E109 25,395,593 527,129 2.12 1,687,787 38.82 0.0952
2023-05-15 2022-12-31 13F/A-99 FORTINET COM 34959E109 24,868,464 -675,931 -2.65 1,215,819 -3.12 0.0714
2023-05-15 2022-12-31 13F FORTINET COM 34959E109 24,868,464 -675,931 1,215,819 0.0714
2022-11-15 2022-09-30 13F FORTINET COM 34959E109 25,544,395 -327,654 -1.27 1,254,996 -14.27 0.0794
2022-08-15 2022-06-30 13F FORTINET COM 34959E109 25,872,049 20,487,614 380.50 1,463,841 -20.45 0.0877
2022-05-16 2022-03-31 13F FORTINET COM 34959E109 5,384,435 -136,312 -2.47 1,840,077 -7.26 0.0910
2022-02-14 2021-12-31 13F FORTINET COM 34959E109 5,520,747 226,498 4.28 1,984,156 28.33 0.0941
2021-11-15 2021-09-30 13F FORTINET COM 34959E109 5,294,249 37,140 0.71 1,546,132 23.47 0.0817
2021-08-16 2021-06-30 13F FORTINET COM 34959E109 5,257,109 66,806 1.29 1,252,191 30.82 0.0660
2021-07-09 2021-03-31 13F/A-1 FORTINET COM 34959E109 5,190,303 -147,815 -2.77 957,196 20.73 0.0549
2021-05-17 2021-03-31 13F FORTINET COM 34959E109 5,190,303 -147,815 957,196 0.0549
2021-02-16 2020-12-31 13F FORTINET COM 34959E109 5,338,118 -132,325 -2.42 792,871 23.03 0.0485
2020-11-10 2020-09-30 13F FORTINET COM 34959E109 5,470,443 -163,361 -2.90 644,473 -16.66 0.0440
2020-08-14 2020-06-30 13F FORTINET COM 34959E109 5,633,804 -185,053 -3.18 773,352 31.37 0.0562
2020-06-19 2020-03-31 13F/A-1 FORTINET COM 34959E109 5,818,857 24,632 0.43 588,694 -4.83 0.0515
2020-05-11 2020-03-31 13F FORTINET COM 34959E109 5,818,857 24,632 588,694 51,699.1867
2020-02-06 2019-12-31 13F FORTINET COM 34959E109 5,794,225 -50,582 -0.87 618,591 37.88 0.0424
2019-11-14 2019-09-30 13F FORTINET COM 34959E109 5,844,807 -23,793 -0.41 448,647 -0.50 0.0334
2019-08-14 2019-06-30 13F FORTINET COM 34959E109 5,868,600 26,493 0.45 450,885 -8.09 0.0336
2019-05-15 2019-03-31 13F FORTINET COM 34959E109 5,842,107 387,977 7.11 490,562 27.71 0.0383
2019-02-12 2018-12-31 13F FORTINET COM 34959E109 5,454,130 842,717 18.27 384,134 -9.72 0.0350
2018-11-09 2018-09-30 13F FORTINET Common equity shares 34959E109 4,611,413 247,545 5.67 425,496 56.18 0.0327
2018-08-14 2018-06-30 13F FORTINET Common equity shares 34959E109 4,363,868 -222,620 -4.85 272,436 10.86 0.0228
2018-05-15 2018-03-31 13F FORTINET Common equity shares 34959E109 4,586,488 -183,379 -3.84 245,748 17.92 0.0209
2018-02-14 2017-12-31 13F FORTINET Common equity shares 34959E109 4,769,867 54,434 1.15 208,397 23.30 0.0168
2017-11-14 2017-09-30 13F FORTINET Common equity shares 34959E109 4,715,433 133,966 2.92 169,013 -1.47 0.0146
2017-08-14 2017-06-30 13F FORTINET Common equity shares 34959E109 4,581,467 132,054 2.97 171,534 0.53 0.0152
2017-05-15 2017-03-31 13F FORTINET Common equity shares 34959E109 4,449,413 118,681 2.74 170,638 30.83 0.0152
2017-02-09 2016-12-31 13F FORTINET Common equity shares 34959E109 4,330,732 -148,120 -3.31 130,432 -21.14 0.0123
2017-01-13 2016-09-30 13F/A-1 FORTINET Common equity shares 34959E109 4,478,852 -58,092 -1.28 165,396 15.40 0.0167
2016-11-14 2016-09-30 13F FORTINET Common equity shares 34959E109 4,465,452 164,901
2016-08-12 2016-06-30 13F FORTINET Common equity shares 34959E109 4,536,944 118,978 2.69 143,318 5.90 0.0154
2016-05-20 2016-03-31 13F/A-1 FORTINET Common equity shares 34959E109 4,417,966 64,030 1.47 135,328 -0.29 0.0146
2016-05-12 2016-03-31 13F FORTINET Common equity shares 34959E109 4,417,966 135,328
2016-02-16 2015-12-31 13F FORTINET Common equity shares 34959E109 4,353,936 843,707 24.04 135,720 -8.98 0.0148
2015-11-16 2015-09-30 13F FORTINET Common equity shares 00350E113 3,510,229 51,956 1.50 149,107 4.32 0.0174
2015-08-13 2015-06-30 13F FORTINET Common equity shares 00350E113 3,458,273 -148,901 -4.13 142,933 13.38 0.0153
2015-05-15 2015-03-31 13F FORTINET Common equity shares 34959E109 3,607,174 167,095 4.86 126,065 19.52 0.0129
2015-02-11 2014-12-31 13F FORTINET Common equity shares 34959E109 3,440,079 47,193 1.39 105,474 23.04 0.0105
2014-11-12 2014-09-30 13F/A-1 FORTINET Common equity shares 34959E109 3,392,886 -40,196 -1.17 85,724 -0.64 0.0092
2014-11-10 2014-09-30 13F FORTINET Common equity shares 34959E109 3,392,886 85,724
2014-08-12 2014-06-30 13F FORTINET Common equity shares 34959E109 3,433,082 2,940 0.09 86,276 14.18 0.0093
2014-05-15 2014-03-31 13F/A-1 FORTINET Common equity shares 34959E109 3,430,142 1,767,106 106.26 75,561 137.49 0.0086
2014-05-13 2014-03-31 13F FORTINET Common equity shares 34959E109 3,430,942 75,579
2014-02-06 2013-12-31 13F/A-1 FORTINET Common equity shares 34959E109 1,663,036 5,006 0.30 31,816 -5.26 0.0035
2014-02-06 2013-12-31 13F FORTINET Common equity shares 34959E109 1,595,597 33,626
2013-11-12 2013-09-30 13F FORTINET Common equity shares 34959E109 1,658,030 -29,751 -1.76 33,584 13.69 0.0041
2013-08-08 2013-06-30 13F FORTINET Common equity shares 34959E109 1,687,781 1,687,781 29,541 0.0039
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.