Fortinet, Inc.
MX ˙ BMV ˙ US34959E1091
SecurityMX:FTNT / Fortinet, Inc.
InstitutionAmerican Capital Management Inc
Latest Disclosed Ownership828,923 shares
Latest Disclosed Value $ 67,739,588
American Capital Management Inc reports 10.46% decrease in ownership of FTNT / Fortinet, Inc.

On May 15, 2026 - American Capital Management Inc filed a 13F-HR form disclosing ownership of 828,923 shares of Fortinet, Inc. (MX:FTNT) valued at $67,739,588 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 925,753 shares of Fortinet, Inc.. This represents a change in shares of -10.46% 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.

Upgrade to unlock premium data and export to Excel .

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 828,923 -96,830 -10.46 67,740 -7.86 3.6382
2026-02-17 2025-12-31 13F FORTINET COM 34959E109 925,753 -37,605 -3.90 73,514 -9.24 3.2436
2025-11-14 2025-09-30 13F FORTINET COM 34959E109 963,358 -48,113 -4.76 80,999 -24.25 3.2269
2025-08-14 2025-06-30 13F Fortinet COM 34959E109 1,011,471 -275,249 -21.39 106,933 -13.67 4.4354
2025-05-15 2025-03-31 13F Fortinet COM 34959E109 1,286,720 -204,418 -13.71 123,860 -12.08 5.0400
2025-02-11 2024-12-31 13F Fortinet COM 34959E109 1,491,138 -356,727 -19.30 140,883 -1.69 5.2444
2024-11-14 2024-09-30 13F Fortinet COM 34959E109 1,847,865 -494,917 -21.13 143,302 1.49 4.6858
2024-08-14 2024-06-30 13F Fortinet COM 34959E109 2,342,782 -13,973 -0.59 141,199 -12.29 4.7264
2024-05-15 2024-03-31 13F Fortinet COM 34959E109 2,356,755 -25,304 -1.06 160,990 15.47 5.1605
2024-02-14 2023-12-31 13F Fortinet COM 34959E109 2,382,059 -31,100 -1.29 139,422 -1.54 4.7687
2023-11-14 2023-09-30 13F Fortinet COM 34959E109 2,413,159 -293,053 -10.83 141,604 -30.78 5.4590
2023-08-14 2023-06-30 13F Fortinet COM 34959E109 2,706,212 -701,663 -20.59 204,563 -9.68 7.1040
2023-05-03 2023-03-31 13F Fortinet COM 34959E109 3,407,875 -157,365 -4.41 226,487 29.94 7.9711
2023-02-14 2022-12-31 13F Fortinet COM 34959E109 3,565,240 -34,012 -0.94 174,305 -1.43 6.8251
2022-11-14 2022-09-30 13F Fortinet COM 34959E109 3,599,252 -105,189 -2.84 176,831 -15.63 6.9795
2022-08-15 2022-06-30 13F Fortinet COM 34959E109 3,704,441 2,923,614 374.43 209,597 -21.45 7.8550
2022-05-16 2022-03-31 13F Fortinet COM 34959E109 780,827 -71,471 -8.39 266,840 -12.89 7.8688
2022-02-14 2021-12-31 13F Fortinet COM 34959E109 852,298 -19,199 -2.20 306,316 20.35 7.8649
2021-11-15 2021-09-30 13F Fortinet COM 34959E109 871,497 -56,457 -6.08 254,512 15.15 6.8351
2021-08-13 2021-06-30 13F Fortinet COM 34959E109 927,954 -10,715 -1.14 221,029 27.68 6.1896
2021-05-17 2021-03-31 13F Fortinet COM 34959E109 938,669 -16,535 -1.73 173,109 22.01 5.2334
2021-02-16 2020-12-31 13F Fortinet COM 34959E109 955,204 -2,141 -0.22 141,876 25.79 4.2423
2020-11-16 2020-09-30 13F Fortinet COM 34959E109 957,345 -40,030 -4.01 112,785 -17.62 4.1446
2020-08-13 2020-06-30 13F Fortinet COM 34959E109 997,375 -35,385 -3.43 136,910 31.03 5.0352
2020-05-15 2020-03-31 13F Fortinet COM 34959E109 1,032,760 -857 -0.08 104,484 -5.31 5.0838
2020-02-12 2019-12-31 13F Fortinet COM 34959E109 1,033,617 5,451 0.53 110,349 39.82 4.6262
2019-11-14 2019-09-30 13F Fortinet COM 34959E109 1,028,166 1,240 0.12 78,922 0.03 3.4940
2019-11-14 2019-06-30 13F/A-1 Fortinet COM 34959E109 1,026,926 34,955 3.52 78,899 -5.28 3.3760
2019-08-12 2019-06-30 13F Fortinet COM 34959E109 1,024,201 32,230 78,689
2019-05-14 2019-03-31 13F Fortinet COM 34959E109 991,971 -37,075 -3.60 83,296 14.93 3.8620
2019-02-08 2018-12-31 13F Fortinet COM 34959E109 1,029,046 4,858 0.47 72,476 -23.31 3.8683
2018-11-02 2018-09-30 13F Fortinet COM 34959E109 1,024,188 -26,095 -2.48 94,502 44.13 4.1311
2018-07-17 2018-06-30 13F Fortinet COM 34959E109 1,050,283 5,442 0.52 65,569 17.12 3.3857
2018-04-23 2018-03-31 13F Fortinet COM 34959E109 1,044,841 20,646 2.02 55,983 25.11 3.1893
2018-04-05 2017-12-31 13F/A-1 Fortinet COM 34959E109 1,024,195 86,635 9.24 44,747 33.17 2.6920
2018-01-23 2017-12-31 13F Fortinet COM 34959E109 1,024,395 86,835 44,756
2018-04-05 2017-09-30 13F/A-1 Fortinet COM 34959E109 937,560 92,290 10.92 33,602 6.18 2.1002
2017-10-20 2017-09-30 13F Fortinet COM 34959E109 937,570 88,855 33,603
2018-04-19 2017-06-30 13F/A-1 Fortinet COM 34959E109 845,270 53,420 6.75 31,647 4.22 2.0415
2017-07-27 2017-06-30 13F Fortinet COM 34959E109 848,715 56,865 31,776
2018-04-18 2017-03-31 13F/A-1 Fortinet COM 34959E109 791,850 9,135 1.17 30,367 28.81 2.1436
2017-04-24 2017-03-31 13F Fortinet COM 34959E109 796,260 13,545 30,537
2017-02-16 2016-12-31 13F/A-1 Fortinet COM 34959E109 782,715 130,800 20.06 23,575 -2.08 1.8252
2017-02-09 2016-12-31 13F Fortinet COM 34959E109 782,715 23,575
2016-10-26 2016-09-30 13F Fortinet COM 34959E109 651,915 98,405 17.78 24,075 37.69 1.8497
2016-08-03 2016-06-30 13F Fortinet COM 349590000 553,510 40,946 7.99 17,485 11.37 1.4461
2016-04-25 2016-03-31 13F Fortinet COM 34959E109 512,564 89,499 21.15 15,700 19.06 1.3710
2016-02-10 2015-12-31 13F Fortinet COM 34959E109 423,065 96,705 29.63 13,187 -4.88 1.1704
2015-11-03 2015-09-30 13F Fortinet COM 34959E109 326,360 7,120 2.23 13,864 5.08 1.4375
2015-07-21 2015-06-30 13F Fortinet COM 34959E109 319,240 -14,270 -4.28 13,194 13.19 1.2565
2015-04-16 2015-03-31 13F/A-1 Fortinet COM 34959E109 351,810 48,090 12,296 1.1916
2015-04-21 2015-03-31 13F/A-2 Fortinet COM 34959E109 333,510 29,790 9.81 11,656 25.17 1.1467
2015-02-06 2014-12-31 13F Fortinet COM 34959E109 303,720 17,550 6.13 9,312 28.80 1.0107
2014-10-14 2014-09-30 13F Fortinet COM 34959E109 286,170 16,750 6.22 7,230 6.78 0.8412
2014-07-16 2014-06-30 13F Fortinet COM 34959E109 269,420 68,870 34.34 6,771 53.26 0.7609
2014-04-14 2014-03-31 13F Fortinet COM 34959E109 200,550 102,350 104.23 4,418 135.13 0.5207
2014-01-23 2013-12-31 13F Fortinet COM 34959E109 98,200 98,200 1,879 0.2328
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.