Fortinet, Inc.
MX ˙ BMV ˙ US34959E1091
SecurityMX:FTNT / Fortinet, Inc.
InstitutionGreat Lakes Advisors, Llc
Latest Disclosed Ownership6,565 shares
Latest Disclosed Value $ 536,492
Great Lakes Advisors, Llc reports 28.90% decrease in ownership of FTNT / Fortinet, Inc.

On May 11, 2026 - Great Lakes Advisors, Llc filed a 13F-HR form disclosing ownership of 6,565 shares of Fortinet, Inc. (MX:FTNT) valued at $536,492 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 9,234 shares of Fortinet, Inc.. This represents a change in shares of -28.90% 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)
2026-05-11 2026-03-31 13F Fortinet COM 34959E109 6,565 -2,669 -28.90 536 -26.88 0.0013
2026-02-12 2025-12-31 13F Fortinet COM 34959E109 9,234 2,074 28.97 733 21.76 0.0060
2025-11-03 2025-09-30 13F Fortinet COM 34959E109 7,160 -639 -8.19 602 -26.94 0.0050
2025-08-11 2025-06-30 13F Fortinet COM 34959E109 7,799 -72 -0.91 825 8.85 0.0069
2025-05-16 2025-03-31 13F Fortinet COM 34959E109 7,871 1 0.01 758 1.88 0.0068
2025-02-10 2024-12-31 13F Fortinet COM 34959E109 7,870 9 0.11 744 22.00 0.0064
2024-11-04 2024-09-30 13F Fortinet COM 34959E109 7,861 -1,371 -14.85 610 9.53 0.0051
2024-08-06 2024-06-30 13F Fortinet COM 34959E109 9,232 -945 -9.29 556 -20.00 0.0049
2024-05-08 2024-03-31 13F Fortinet COM 34959E109 10,177 -308 -2.94 695 13.38 0.0059
2024-02-08 2023-12-31 13F Fortinet COM 34959E109 10,485 -546 -4.95 614 -5.26 0.0058
2023-11-07 2023-09-30 13F Fortinet COM 34959E109 11,031 342 3.20 647 -19.83 0.0059
2023-08-10 2023-06-30 13F Fortinet COM 34959E109 10,689 -691 -6.07 808 6.75 0.0081
2023-05-10 2023-03-31 13F Fortinet COM 34959E109 11,380 -511 -4.30 756 30.12 0.0069
2023-02-09 2022-12-31 13F Fortinet COM 34959E109 11,891 -7,614 -39.04 581 -39.35 0.0333
2022-11-09 2022-09-30 13F Fortinet COM 34959E109 19,505 10 0.05 958 -13.15 0.0209
2022-08-09 2022-06-30 13F Fortinet COM 34959E109 19,495 15,446 381.48 1,103 -20.30 0.0218
2022-05-06 2022-03-31 13F Fortinet COM 34959E109 4,049 -171 -4.05 1,384 -8.77 0.0177
2022-02-09 2021-12-31 13F Fortinet COM 34959E109 4,220 -270 -6.01 1,517 15.71 0.0231
2021-11-09 2021-09-30 13F Fortinet COM 34959E109 4,490 -402 -8.22 1,311 12.53 0.0204
2021-08-11 2021-06-30 13F Fortinet COM 34959E109 4,892 2,220 83.08 1,165 136.31 0.0176
2021-05-03 2021-03-31 13F Fortinet COM 34959E109 2,672 -177 -6.21 493 16.55 0.0080
2021-02-09 2020-12-31 13F Fortinet COM 34959E109 2,849 -765 -21.17 423 -0.70 0.0077
2020-11-04 2020-09-30 13F Fortinet COM 34959E109 3,614 -305 -7.78 426 -20.82 0.0090
2020-08-07 2020-06-30 13F Fortinet COM 34959E109 3,919 -1,533 -28.12 538 -2.54 0.0131
2020-05-08 2020-03-31 13F Fortinet COM 34959E109 5,452 -1,855 -25.39 552 -29.23 0.0161
2020-02-07 2019-12-31 13F Fortinet COM 34959E109 7,307 -250 -3.31 780 34.25 0.0167
2019-11-06 2019-09-30 13F Fortinet COM 34959E109 7,557 -156,202 -95.39 581 -95.38 0.0128
2019-08-05 2019-06-30 13F Fortinet COM 34959E109 163,759 4,390 2.75 12,581 -5.99 0.2742
2019-05-07 2019-03-31 13F Fortinet COM 34959E109 159,369 8,926 5.93 13,383 26.30 0.2978
2019-02-13 2018-12-31 13F Fortinet COM 34959E109 150,443 25,802 20.70 10,596 -7.87 0.2510
2018-11-30 2018-09-30 13F/A-2 Fortinet COM 34959E109 124,641 -11,741 -8.61 11,501 35.08 0.2538
2018-11-14 2018-09-30 13F FORTINET COM 34959E109 136,382 0 8,514
2018-08-13 2018-06-30 13F FORTINET COM 34959E109 136,382 64,291 89.18 8,514 120.40 0.1996
2018-05-07 2018-03-31 13F FORTINET CS 34959E109 72,091 18,972 35.72 3,863 66.44 0.0920
2018-02-07 2017-12-31 13F FORTINET CS 34959E109 53,119 4,918 10.20 2,321 34.32 0.0510
2017-11-13 2017-09-30 13F FORTINET CS 34959E109 48,201 4,856 11.20 1,728 6.47 0.0406
2017-08-07 2017-06-30 13F FORTINET CS 34959E109 43,345 15,430 55.27 1,623 51.54 0.0398
2017-05-09 2017-03-31 13F FORTINET CS 34959E109 27,915 4,063 17.03 1,071 49.16 0.0276
2017-02-10 2016-12-31 13F FORTINET CS 34959E109 23,852 -488 -2.00 718 -20.13 0.0189
2016-11-07 2016-09-30 13F FORTINET CS 34959E109 24,340 24,340 899 0.0244
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.