Fortinet, Inc.
MX ˙ BMV ˙ US34959E1091
SecurityMX:FTNT / Fortinet, Inc.
InstitutionMainstay Capital Management Llc /adv
Latest Disclosed Ownership10,029 shares
Latest Disclosed Value $ 819,570
Mainstay Capital Management Llc /adv reports 3.09% increase in ownership of FTNT / Fortinet, Inc.

On May 12, 2026 - Mainstay Capital Management Llc /adv filed a 13F-HR form disclosing ownership of 10,029 shares of Fortinet, Inc. (MX:FTNT) valued at $819,570 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 27, 2026 disclosing 9,728 shares of Fortinet, Inc.. This represents a change in shares of 3.09% 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)
2026-05-12 2026-03-31 13F FORTINET COM 34959E109 10,029 301 3.09 820 6.09 0.0632
2026-01-27 2025-12-31 13F FORTINET COM 34959E109 9,728 1,157 13.50 773 7.22 0.0592
2025-12-10 2025-09-30 13F FORTINET COM 34959E109 8,571 -8,245 -49.03 721 -59.48 0.0722
2025-07-24 2025-06-30 13F FORTINET COM 34959E109 16,816 8,643 105.75 1,778 126.08 0.0877
2025-05-05 2025-03-31 13F FORTINET COM 34959E109 8,173 -43 -0.52 787 1.29 0.1078
2025-02-04 2024-12-31 13F FORTINET COM 34959E109 8,216 195 2.43 776 24.76 0.1180
2024-10-23 2024-09-30 13F FORTINET COM 34959E109 8,021 -2,929 -26.75 622 -5.61 0.1041
2024-07-30 2024-06-30 13F FORTINET COM 34959E109 10,950 1,827 20.03 660 5.78 0.1159
2024-04-30 2024-03-31 13F FORTINET COM 34959E109 9,123 -1,337 -12.78 623 1.80 0.1178
2024-01-25 2023-12-31 13F FORTINET COM 34959E109 10,460 2,068 24.64 612 24.39 0.1164
2023-10-26 2023-09-30 13F FORTINET COM 34959E109 8,392 -2,238 -21.05 492 -38.73 0.1041
2023-07-25 2023-06-30 13F FORTINET COM 34959E109 10,630 0 0.00 804 13.74 0.1440
2023-05-03 2023-03-31 13F FORTINET COM 34959E109 10,630 10,630 706 0.1399
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.