Fortinet, Inc.
US ˙ NasdaqGS ˙ US34959E1091

SecurityFTNT / Fortinet, Inc.
InstitutionMan Group plc
Latest Disclosed Ownership492,550 shares
Latest Disclosed Value $ 40,251,186
Man Group plc ownership in FTNT / Fortinet, Inc.

On May 15, 2026 - Man Group plc filed a 13F-HR form disclosing ownership of 492,550 shares of Fortinet, Inc. (US:FTNT) valued at $40,251,186 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 678,455 shares of Fortinet, Inc.. This represents a change in shares of -27.40% during the quarter. The current value of the position is $72,148,724 USD.

Man Group plc has a history of taking positions in derivatives of the underlying security (FTNT) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD and put options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

FTNT / Fortinet, Inc. Historical Put/Call Ratio
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 492,550 -185,905 -27.40 40,251 -25.29 0.0730
2026-02-17 2025-12-31 13F FORTINET COM 34959E109 678,455 -86,190 -11.27 53,876 -16.20 0.0916
2025-11-14 2025-09-30 13F FORTINET COM 34959E109 764,645 -713,503 -48.27 64,291 -58.86 0.1118
2025-08-14 2025-06-30 13F FORTINET COM 34959E109 1,478,148 390,793 35.94 156,270 49.30 0.2977
2025-05-15 2025-03-31 13F FORTINET COM 34959E109 1,087,355 351,301 47.73 104,669 50.51 0.2654
2025-02-14 2024-12-31 13F FORTINET COM 34959E109 736,054 422,964 135.09 69,542 186.42 0.1830
2024-11-14 2024-09-30 13F FORTINET COM 34959E109 313,090 -403,025 -56.28 24,280 -43.74 0.0632
2024-08-14 2024-06-30 13F FORTINET COM 34959E109 716,115 209,378 41.32 43,160 24.69 0.1090
2024-05-15 2024-03-31 13F FORTINET COM 34959E109 506,737 22,295 4.60 34,615 22.08 0.0873
2024-02-14 2023-12-31 13F FORTINET COM 34959E109 484,442 28,354 19.57 0.0790
2023-11-14 2023-09-30 13F FORTINET COM 34959E109 23,714 13.29 0.0735
2023-08-14 2023-06-30 13F FORTINET COM 34959E109 276,926 20,933 176.44 0.0646
2023-05-15 2023-03-31 13F FORTINET COM 34959E109 7,573 -78.30 0.0269
2023-02-14 2022-12-31 13F FORTINET COM 34959E109 713,643 -513,386 -41.84 34,890 -42.12 0.1251
2022-11-14 2022-09-30 13F FORTINET COM 34959E109 1,227,029 60,285 83.41 0.2798
2022-08-15 2022-06-30 13F FORTINET COM 34959E109 32,869 447.18 0.1393
2022-05-16 2022-03-31 13F FORTINET COM 34959E109 17,579 -42,448 -70.71 6,007 -72.16 0.0209
2022-02-14 2021-12-31 13F FORTINET COM 34959E109 60,027 -8,059 -11.84 21,573 8.49 0.0694
2021-11-15 2021-09-30 13F FORTINET COM 34959E109 68,086 65,190 2,251.04 19,884 2,785.92 0.0697
2021-08-16 2021-06-30 13F FORTINET COM 34959E109 2,896 -11,273 -79.56 689 -73.63 0.0024
2021-05-17 2021-03-31 13F FORTINET COM 34959E109 14,169 -275,578 -95.11 2,613 -93.93 0.0115
2021-02-16 2020-12-31 13F FORTINET COM 34959E109 289,747 -179,222 -38.22 43,036 -22.11 0.1889
2020-11-16 2020-09-30 13F FORTINET COM 34959E109 468,969 113,060 31.77 55,249 13.09 0.2174
2020-08-14 2020-06-30 13F FORTINET COM 34959E109 355,909 -61,814 -14.80 48,856 15.61 0.2464
2020-05-15 2020-03-31 13F FORTINET COM 34959E109 417,723 -362,212 -46.44 42,261 -49.25 0.2738
2020-02-18 2019-12-31 13F FORTINET COM 34959E109 779,935 561,805 257.56 83,265 397.28 0.2738
2019-11-14 2019-09-30 13F FORTINET COM 34959E109 218,130 -16,558 -7.06 16,744 -7.14 0.0622
2019-08-14 2019-06-30 13F FORTINET COM 34959E109 234,688 30,402 14.88 18,031 5.12 0.0652
2019-05-15 2019-03-31 13F FORTINET COM 34959E109 204,286 87,883 75.50 17,153 109.23 0.0651
2019-02-14 2018-12-31 13F FORTINET COM 34959E109 116,403 -8,989 -7.17 8,198 -29.14 0.0365
2018-11-14 2018-09-30 13F FORTINET COM 34959E109 125,392 -260,156 -67.48 11,570 -51.93 0.0423
2018-08-14 2018-06-30 13F FORTINET COM 34959E109 385,548 109,707 39.77 24,069 62.85 0.0990
2018-05-15 2018-03-31 13F FORTINET COM 34959E109 275,841 275,841 14,780 0.0676
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-15 2026-03-31 13F FORTINET COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2026-02-17 2025-12-31 13F FORTINET COM Call 5,000 -28.57 397 -32.48 n/a n/a n/a
2025-11-14 2025-09-30 13F FORTINET COM Call 7,000 589 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-15 2026-03-31 13F FORTINET COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2026-02-17 2025-12-31 13F FORTINET COM Put 5,000 -28.57 397 -32.48 n/a n/a n/a
2025-11-14 2025-09-30 13F FORTINET COM Put 7,000 589 n/a n/a n/a
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.