Fortinet, Inc.
MX ˙ BMV ˙ US34959E1091
SecurityMX:FTNT / Fortinet, Inc.
InstitutionGabelli Funds Llc
Latest Disclosed Ownership5,703 shares
Latest Disclosed Value $ 466,049
Gabelli Funds Llc reports 13.36% increase in ownership of FTNT / Fortinet, Inc.

On May 14, 2026 - Gabelli Funds Llc filed a 13F-HR form disclosing ownership of 5,703 shares of Fortinet, Inc. (MX:FTNT) valued at $466,049 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 5,031 shares of Fortinet, Inc.. This represents a change in shares of 13.36% 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)
2026-05-14 2026-03-31 13F FORTINET EQUITY 34959E109 5,703 672 13.36 466 16.79 0.0031
2026-02-05 2025-12-31 13F FORTINET EQUITY 34959E109 5,031 1,000 24.81 400 18.05 0.0027
2025-11-12 2025-09-30 13F FORTINET EQUITY 34959E109 4,031 0 0.00 339 -20.66 0.0023
2025-08-13 2025-06-30 13F FORTINET EQUITY 34959E109 4,031 0 0.00 426 9.79 0.0030
2025-05-14 2025-03-31 13F FORTINET EQUITY 34959E109 4,031 0 0.00 388 2.11 0.0030
2025-02-13 2024-12-31 13F FORTINET EQUITY 34959E109 4,031 0 0.00 381 21.79 0.0029
2024-11-13 2024-09-30 13F FORTINET EQUITY 34959E109 4,031 4,031 313 0.0023
2024-08-13 2024-06-30 13F FORTINET EQUITY 34959E109 0 -3,000 -100.00 0 -100.00
2024-05-14 2024-03-31 13F FORTINET EQUITY 34959E109 3,000 3,000 205 0.0015
2020-02-14 2019-12-31 13F FORTINET INC COM COM 34959E109 0 -8,000 -100.00 0 -100.00
2019-11-01 2019-09-30 13F FORTINET INC COM COM 34959E109 8,000 -2,000 -20.00 614 -20.05 0.0041
2019-08-02 2019-06-30 13F FORTINET INC COM COM 34959E109 10,000 -36,000 -78.26 768 -80.12 0.0049
2019-05-02 2019-03-31 13F FORTINET INC COM COM 34959E109 46,000 -4,000 -8.00 3,863 9.68 0.0243
2019-01-30 2018-12-31 13F FORTINET INC COM COM 34959E109 50,000 -2,000 -3.85 3,522 -26.59 0.0241
2018-11-02 2018-09-30 13F FORTINET INC COM COM 34959E109 52,000 0 0.00 4,798 47.81 0.0275
2018-08-10 2018-06-30 13F FORTINET INC COM COM 34959E109 52,000 0 0.00 3,246 16.51 0.0192
2018-05-09 2018-03-31 13F FORTINET INC COM COM 34959E109 52,000 0 0.00 2,786 22.62 0.0166
2018-02-02 2017-12-31 13F FORTINET INC COM COM 34959E109 52,000 0 0.00 2,272 21.89 0.0131
2017-11-01 2017-09-30 13F FORTINET INC COM COM 34959E109 52,000 0 0.00 1,864 -4.26 0.0107
2017-08-03 2017-06-30 13F FORTINET INC COM COM 34959E109 52,000 0 0.00 1,947 -2.36 0.0116
2017-05-04 2017-03-31 13F FORTINET INC COM COM 34959E113 52,000 0 0.00 1,994 27.33 0.0118
2017-02-10 2016-12-31 13F FORTINET INC COM COM 34959E109 52,000 -85,000 -62.04 1,566 -69.05 0.0093
2016-11-10 2016-09-30 13F FORTINET INC COM COM 34959E109 137,000 -5,000 -3.52 5,059 12.77 0.0300
2016-08-04 2016-06-30 13F FORTINET INC COM COM 34959E109 142,000 -30,000 -17.44 4,486 -14.84 0.0265
2016-05-05 2016-03-31 13F FORTINET INC COM COM 34959E109 172,000 -5,000 -2.82 5,268 -4.51 0.0318
2016-02-05 2015-12-31 13F FORTINET INC COM COM 34959E109 177,000 125,000 240.38 5,517 149.75 0.0334
2015-10-23 2015-09-30 13F FORTINET INC COM COM 34959E109 52,000 -1,000 -1.89 2,209 0.87 0.0131
2015-08-05 2015-06-30 13F FORTINET INC COM COM 34959E109 53,000 -100,000 -65.36 2,190 -59.04 0.0115
2015-05-01 2015-03-31 13F FORTINET INC COM COM 34959E109 153,000 100,000 188.68 5,347 229.05 0.0271
2015-02-05 2014-12-31 13F FORTINET INC COM COM 34959E109 53,000 0 0.00 1,625 21.36 0.0079
2014-10-30 2014-09-30 13F FORTINET INC COM COM 34959E109 53,000 0 0.00 1,339 0.53 0.0068
2014-08-06 2014-06-30 13F FORTINET INC COM COM 34959E109 53,000 25,000 89.29 1,332 115.88 0.0066
2014-05-16 2014-03-31 13F/A-1 FORTINET INC COM COM 34959E109 28,000 8,000 40.00 617 61.10 0.0032
2014-05-02 2014-03-31 13F FORTINET INC COM COM 34959E109 28,000 617
2014-02-07 2013-12-31 13F FORTINET INC COM COM 34959E109 20,000 20,000 383 0.0020
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.