Fortinet, Inc.
MX ˙ BMV ˙ US34959E1091
SecurityMX:FTNT / Fortinet, Inc.
InstitutionRhumbline Advisers
Latest Disclosed Ownership1,171,056 shares
Latest Disclosed Value $ 95,698,575
Rhumbline Advisers reports 1.62% decrease in ownership of FTNT / Fortinet, Inc.

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 1,171,056 shares of Fortinet, Inc. (MX:FTNT) valued at $95,698,575 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,190,392 shares of Fortinet, Inc.. This represents a change in shares of -1.62% 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 1,171,056 -19,336 -1.62 95,699 1.24 0.0819
2026-02-13 2025-12-31 13F FORTINET COM 34959E109 1,190,392 -32,852 -2.69 94,529 -8.09 0.0764
2025-11-06 2025-09-30 13F FORTINET COM 34959E109 1,223,244 28,165 2.36 102,850 -18.59 0.0826
2025-08-12 2025-06-30 13F FORTINET COM 34959E109 1,195,079 -71,047 -5.61 126,344 3.66 0.1082
2025-05-29 2025-03-31 13F/A-1 FORTINET COM 34959E109 1,266,126 44,781 3.67 121,877 5.62 0.1140
2025-04-08 2025-03-31 13F FORTINET COM 34959E109 1,266,126 44,781 121,877 0.1140
2025-05-29 2024-12-31 13F/A-1 FORTINET COM 34959E109 1,221,345 -1,895 -0.15 115,393 21.64 0.1032
2025-01-30 2024-12-31 13F FORTINET COM 34959E109 1,221,345 -1,895 115,393 0.1032
2024-11-12 2024-09-30 13F FORTINET COM 34959E109 1,223,240 13,060 1.08 94,862 30.06 0.0856
2024-08-01 2024-06-30 13F FORTINET COM 34959E109 1,210,180 -39,848 -3.19 72,937 -14.58 0.0685
2024-05-09 2024-03-31 13F FORTINET COM 34959E109 1,250,028 45,785 3.80 85,389 21.15 0.0820
2024-02-08 2023-12-31 13F FORTINET COM 34959E109 1,204,243 -22,977 -1.87 70,484 -2.12 0.0739
2023-11-09 2023-09-30 13F FORTINET COM 34959E109 1,227,220 1,995 0.16 72,013 -22.24 0.0836
2023-08-08 2023-06-30 13F FORTINET COM 34959E109 1,225,225 -39,634 -3.13 92,615 110,154.76 0.1037
2023-05-11 2023-03-31 13F FORTINET COM 34959E109 1,264,859 86,839 7.37 84 -99.85 0.1037
2023-02-14 2022-12-31 13F FORTINET COM 34959E109 1,178,020 36,793 3.22 57,593 2.72 0.0774
2022-11-10 2022-09-30 13F FORTINET COM 34959E109 1,141,227 4,591 0.40 56,068 -12.82 0.0835
2022-08-11 2022-06-30 13F FORTINET COM 34959E109 1,136,636 927,055 442.34 64,311 -10.21 0.0938
2022-05-12 2022-03-31 13F FORTINET COM 34959E109 209,581 -8,689 -3.98 71,622 -8.70 0.0922
2022-02-10 2021-12-31 13F FORTINET COM 34959E109 218,270 4,559 2.13 78,446 25.69 0.0961
2021-11-12 2021-09-30 13F FORTINET COM 34959E109 213,711 2,104 0.99 62,412 23.83 0.0845
2021-08-05 2021-06-30 13F FORTINET COM 34959E109 211,607 -13,736 -6.10 50,403 21.28 0.0661
2021-05-06 2021-03-31 13F FORTINET COM 34959E109 225,343 -16,271 -6.73 41,558 15.80 0.0565
2021-02-10 2020-12-31 13F FORTINET COM 34959E109 241,614 -12,396 -4.88 35,887 19.92 0.0495
2020-11-12 2020-09-30 13F FORTINET COM 34959E109 254,010 -7,726 -2.95 29,925 -16.71 0.0469
2020-08-13 2020-06-30 13F FORTINET COM 34959E109 261,736 -1,775 -0.67 35,929 34.77 0.0600
2020-05-06 2020-03-31 13F FORTINET COM 34959E109 263,511 9,756 3.84 26,659 -1.59 0.0559
2020-02-05 2019-12-31 13F FORTINET COM 34959E109 253,755 -854 -0.34 27,091 38.62 0.0453
2019-10-23 2019-09-30 13F FORTINET COM 34959E109 254,609 1,685 0.67 19,544 0.58 0.0357
2019-08-14 2019-06-30 13F FORTINET COM 34959E109 252,924 18,842 8.05 19,432 -1.14 0.0365
2019-05-01 2019-03-31 13F FORTINET COM 34959E109 234,082 -7,874 -3.25 19,656 15.35 0.0381
2019-01-31 2018-12-31 13F FORTINET COM 34959E109 241,956 -41,636 -14.68 17,041 -34.88 0.0371
2018-11-07 2018-09-30 13F FORTINET COM 34959E109 283,592 -8,789 -3.01 26,167 43.36 0.0505
2018-08-06 2018-06-30 13F FORTINET COM 34959E109 292,381 -5,482 -1.84 18,253 14.37 0.0368
2018-05-02 2018-03-31 13F FORTINET COM 34959E109 297,863 -25,701 -7.94 15,959 12.89 0.0333
2018-02-09 2017-12-31 13F FORTINET COM 34959E109 323,564 -6,778 -2.05 14,137 19.41 0.0287
2017-11-06 2017-09-30 13F FORTINET COM 34959E109 330,342 38,030 13.01 11,839 8.18 0.0257
2017-08-02 2017-06-30 13F FORTINET COM 34959E109 292,312 2,898 1.00 10,944 -1.40 0.0250
2017-05-02 2017-03-31 13F FORTINET COM 34959E109 289,414 11,554 4.16 11,099 32.62 0.0259
2017-01-27 2016-12-31 13F FORTINET COM 34959E109 277,860 13,848 5.25 8,369 -14.16 0.0212
2016-11-08 2016-09-30 13F FORTINET COM 34959E109 264,012 10,972 4.34 9,750 21.97 0.0269
2016-08-11 2016-06-30 13F FORTINET COM 34959E109 253,040 6,351 2.57 7,994 5.80 0.0237
2016-05-02 2016-03-31 13F FORTINET INC USD. COM 34959E109 246,689 -4,050 -1.62 7,556 -3.33 0.0234
2016-02-03 2015-12-31 13F FORTINET INC USD. COM 34959E109 250,739 -1,840 -0.73 7,816 -27.16 0.0252
2015-11-04 2015-09-30 13F FORTINET INC USD. COM 34959E109 252,579 14,526 6.10 10,730 9.06 0.0365
2015-08-04 2015-06-30 13F FORTINET INC USD. COM 34959E109 238,053 23,487 10.95 9,839 31.20 0.0314
2015-05-12 2015-03-31 13F FORTINET INC USD. COM 34959E109 214,566 23,830 12.49 7,499 28.23 0.0216
2015-02-06 2014-12-31 13F FORTINET INC USD. COM 34959E109 190,736 1,890 1.00 5,848 22.57 0.0170
2014-11-12 2014-09-30 13F FORTINET INC USD. COM 34959E109 188,846 2,217 1.19 4,771 1.73 0.0143
2014-08-06 2014-06-30 13F FORTINET INC USD. COM 34959E109 186,629 -17,019 -8.36 4,690 4.55 0.0138
2014-05-06 2014-03-31 13F FORTINET INC USD. COM 34959E109 203,648 90,274 79.62 4,486 106.82 0.0133
2014-02-03 2013-12-31 13F FORTINET INC USD. COM 34959E109 113,374 -12,113 -9.65 2,169 -14.67 0.0064
2013-11-05 2013-09-30 13F FORTINET INC USD. COM 34959E109 125,487 -2,949 -2.30 2,542 13.08 0.0079
2013-08-07 2013-06-30 13F FORTINET INC USD. COM 34959E109 128,436 128,436 2,248 0.0072
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.