Fortinet, Inc.
MX ˙ BMV ˙ US34959E1091
SecurityMX:FTNT / Fortinet, Inc.
InstitutionRobeco Institutional Asset Management B.V.
Latest Disclosed Ownership2,250,736 shares
Latest Disclosed Value $ 183,930,150
Robeco Institutional Asset Management B.V. reports 10.78% decrease in ownership of FTNT / Fortinet, Inc.

On April 21, 2026 - Robeco Institutional Asset Management B.V. filed a 13F-HR form disclosing ownership of 2,250,736 shares of Fortinet, Inc. (MX:FTNT) valued at $183,930,150 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 2,522,604 shares of Fortinet, Inc.. This represents a change in shares of -10.78% 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)
2026-04-21 2026-03-31 13F FORTINET COM 34959E109 2,250,736 -271,868 -10.78 183,930 -8.18 0.2622
2026-01-23 2025-12-31 13F FORTINET COM 34959E109 2,522,604 892,969 54.80 200,320 46.20 0.2853
2025-10-22 2025-09-30 13F FORTINET COM 34959E109 1,629,635 -931,704 -36.38 137,020 -49.40 0.1985
2025-07-18 2025-06-30 13F FORTINET COM 34959E109 2,561,339 -117,064 -4.37 270,785 5.03 0.4378
2025-04-23 2025-03-31 13F FORTINET COM 34959E109 2,678,403 -457,562 -14.59 257,823 -12.98 0.5008
2025-01-23 2024-12-31 13F FORTINET COM 34959E109 3,135,965 -268,010 -7.87 296,286 12.24 0.5616
2024-10-29 2024-09-30 13F FORTINET COM 34959E109 3,403,975 309,772 10.01 263,978 41.55 0.5244
2024-07-23 2024-06-30 13F FORTINET COM 34959E109 3,094,203 262,520 9.27 186,488 -3.59 0.4012
2024-04-24 2024-03-31 13F FORTINET COM 34959E109 2,831,683 -445,079 -13.58 193,432 0.86 0.4203
2024-02-14 2023-12-31 13F/A-1 FORTINET COM 34959E109 3,276,762 -299,462 -8.37 191,789 -8.61 0.4650
2024-02-08 2023-12-31 13F FORTINET COM 34959E109 2,166,994 -1,409,230 3,277 0.6137
2023-10-24 2023-09-30 13F FORTINET COM 34959E109 3,576,224 1,585,236 79.62 209,853 39.44 0.5608
2023-07-24 2023-06-30 13F FORTINET COM 34959E109 1,990,988 -38,401 -1.89 150,499 11.58 0.3946
2023-05-04 2023-03-31 13F FORTINET COM 34959E109 2,029,389 -104,266 -4.89 134,873 29.30 0.3677
2023-02-07 2022-12-31 13F FORTINET COM 34959E109 2,133,655 36,940 1.76 104,314 1.27 0.3006
2022-12-01 2022-09-30 13F/A-1 FORTINET COM 34959E109 2,096,715 77,092 3.82 103,008 -9.86 0.3329
2022-10-27 2022-09-30 13F FORTINET COM 34959E109 2,096,715 77,092 103,008 0.3284
2022-12-01 2022-06-30 13F/A-1 FORTINET COM 34959E109 2,019,623 1,608,372 391.09 114,271 -18.69 0.3550
2022-07-27 2022-06-30 13F FORTINET COM 34959E109 2,019,623 1,608,372 114,271 0.3501
2022-12-01 2022-03-31 13F/A-1 FORTINET COM 34959E109 411,251 12,206 3.06 140,540 -2.01 0.3310
2022-04-26 2022-03-31 13F FORTINET COM 34959E109 411,251 12,206 140,540 0.3271
2022-12-01 2021-12-31 13F/A-1 FORTINET COM 34959E109 399,045 -16,190 -3.90 143,416 18.27 0.3052
2022-01-31 2021-12-31 13F FORTINET COM 34959E109 399,045 -16,190 143,416 0.3014
2022-12-01 2021-09-30 13F/A-1 FORTINET COM 34959E109 415,235 -50,734 -10.89 121,266 9.26 0.2689
2021-10-20 2021-09-30 13F FORTINET COM 34959E109 415,235 -50,734 121,266 0.2654
2022-12-01 2021-06-30 13F/A-1 FORTINET COM 34959E109 465,969 -17,478 -3.62 110,986 24.49 0.2460
2021-07-28 2021-06-30 13F FORTINET COM 34959E109 465,969 -17,478 110,986 0.2427
2022-12-01 2021-03-31 13F/A-1 FORTINET COM 34959E109 483,447 46,048 10.53 89,154 37.23 0.2197
2021-04-23 2021-03-31 13F FORTINET COM 34959E109 483,447 46,048 89,154 0.2166
2022-12-01 2020-12-31 13F/A-1 FORTINET COM 34959E109 437,399 -13,241 -2.94 64,966 22.38 0.1707
2021-01-28 2020-12-31 13F FORTINET COM 34959E109 437,399 -13,241 64,966 0.1686
2021-01-19 2020-09-30 13F/A-1 FORTINET COM 34959E109 450,640 43,346 10.64 53,086 -5.05 0.1641
2020-10-29 2020-09-30 13F FORTINET COM 34959E109 450,640 43,346 53,086 163,946.8453
2021-01-19 2020-06-30 13F/A-1 FORTINET COM 34959E109 407,294 -12,775 -3.04 55,911 31.55 0.1899
2020-07-20 2020-06-30 13F FORTINET COM 34959E109 407,294 -12,775 55,911 189,715.9957
2021-01-19 2020-03-31 13F/A-1 FORTINET COM 34959E109 420,069 22,886 5.76 42,502 0.23 0.1705
2020-04-30 2020-03-31 13F FORTINET COM 34959E109 420,069 22,886 42,502 170,357.6011
2021-01-19 2019-12-31 13F/A-1 FORTINET COM 34959E109 397,183 -154,196 -27.97 42,404 0.18 0.1358
2020-02-06 2019-12-31 13F FORTINET COM 34959E109 397,183 -154,196 42,404 135,625.9332
2021-01-19 2019-09-30 13F/A-1 FORTINET COM 34959E109 551,379 -99,773 -15.32 42,326 -15.39 0.1494
2019-10-17 2019-09-30 13F FORTINET COM 34959E109 551,379 -99,773 42,326 149,216.5567
2021-01-19 2019-06-30 13F/A-1 FORTINET COM 34959E109 651,152 2,661 0.41 50,025 -8.13 0.1767
2019-07-19 2019-06-30 13F FORTINET COM 34959E109 651,152 2,661 50,025 176,401.2350
2021-01-19 2019-03-31 13F/A-1 FORTINET COM 34959E109 648,491 35,726 5.83 54,451 26.20 0.2002
2019-05-02 2019-03-31 13F FORTINET COM 34959E109 648,491 35,726 54,451 199,924.7019
2021-01-19 2018-12-31 13F/A-1 FORTINET COM 34959E109 612,765 1,183 0.19 43,145 -23.54 0.1937
2019-02-08 2018-12-31 13F FORTINET COM 34959E109 612,765 1,183 43,145 193,395.3244
2021-01-19 2018-09-30 13F/A-1 FORTINET COM 34959E109 611,582 107,502 21.33 56,431 79.32 0.2235
2018-10-25 2018-09-30 13F FORTINET COM 34959E109 610,249 106,169 56,308
2021-01-19 2018-06-30 13F/A-1 FORTINET COM 34959E109 504,080 278,684 123.64 31,469 160.57 0.1433
2018-08-03 2018-06-30 13F FORTINET COM 34959E109 504,080 278,684 31,469
2021-01-19 2018-03-31 13F/A-1 FORTINET COM 34959E109 225,396 118,178 110.22 12,077 157.78 0.0567
2018-05-07 2018-03-31 13F FORTINET COM 34959E109 225,396 118,178 12,077 56,478.4796
2021-01-19 2017-12-31 13F/A-1 FORTINET COM 34959E109 107,218 99,794 1,344.21 4,685 1,661.28 0.0243
2018-01-25 2017-12-31 13F FORTINET COM 34959E109 107,218 99,794 4,685
2021-01-19 2017-09-30 13F/A-1 FORTINET COM 34959E109 7,424 5,154 227.05 266 216.67 0.0017
2017-10-17 2017-09-30 13F FORTINET COM 34959E109 7,424 7,424 266 1,647.9633
2021-01-19 2017-06-30 13F/A-1 FORTINET COM 34959E109 2,270 2,270 84 0.0005
2016-05-16 2016-03-31 13F FORTINET COM 34959E109 0 -834 -100.00 0 -100.00
2016-02-08 2015-12-31 13F FORTINET COM 34959E109 834 -29,398 -97.24 26 -97.98 0.0002
2015-11-12 2015-09-30 13F FORTINET COM 34959E109 30,232 15,355 103.21 1,285 108.94 0.0098
2015-08-17 2015-06-30 13F FORTINET COM 34959E109 14,877 14,877 615 0.0047
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.