Fortinet, Inc.
KZ ˙ KAS ˙ US34959E1091
SecurityKZ:FTNT_KZ / Fortinet, Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership2,887,018 shares
Latest Disclosed Value $ 235,927,111
Citigroup Inc ownership in FTNT_KZ / Fortinet, Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 2,887,018 shares of Fortinet, Inc. (KZ:FTNT_KZ) valued at $235,927,111 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 2,536,371 shares of Fortinet, Inc.. This represents a change in shares of 13.82% during the quarter.

Citigroup Inc has a history of taking positions in derivatives of the underlying security (FTNT_KZ) in the form of stock options. The firm currently holds call options representing 15,000 of underlying shares valued at $1,225,800 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.

KZ:FTNT_KZ / 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)
2026-05-11 2026-03-31 13F FORTINET COM 34959E109 2,887,018 350,647 13.82 235,927 17.14 0.0506
2026-02-13 2025-12-31 13F FORTINET COM 34959E109 2,536,371 -293,984 -10.39 201,413 -15.36 0.0889
2025-11-10 2025-09-30 13F FORTINET COM 34959E109 2,830,355 458,468 19.33 237,976 -5.10 0.1061
2025-08-11 2025-06-30 13F FORTINET COM 34959E109 2,371,887 -48,972 -2.02 250,756 7.61 0.1232
2025-05-12 2025-03-31 13F FORTINET COM 34959E109 2,420,859 1,072,062 79.48 233,032 82.86 0.1191
2025-02-12 2024-12-31 13F FORTINET COM 34959E109 1,348,797 -106,451 -7.31 127,434 12.92 0.0756
2024-11-12 2024-09-30 13F FORTINET COM 34959E109 1,455,248 -324,321 -18.22 112,854 5.22 0.0654
2024-08-12 2024-06-30 13F FORTINET COM 34959E109 1,779,569 432,250 32.08 107,255 16.54 0.0687
2024-05-10 2024-03-31 13F FORTINET COM 34959E109 1,347,319 437,366 48.06 92,035 72.81 0.0604
2024-02-09 2023-12-31 13F FORTINET COM 34959E109 909,953 -59,483 -6.14 53,260 -6.38 0.0375
2023-12-06 2023-09-30 13F/A-1 FORTINET COM 34959E109 969,436 50,342 5.48 56,887 -18.12 0.0425
2023-11-09 2023-09-30 13F FORTINET COM 34959E109 969,436 50,342 56,887 0.0170
2023-08-10 2023-06-30 13F FORTINET COM 34959E109 919,094 116,655 14.54 69,474 30.27 0.0456
2023-05-11 2023-03-31 13F FORTINET COM 34959E109 802,439 -78,114 -8.87 53,330 23.88 0.0374
2023-02-09 2022-12-31 13F FORTINET COM 34959E109 880,553 39,319 4.67 43,050 4.16 0.0343
2022-11-10 2022-09-30 13F FORTINET COM 34959E109 841,234 182,178 27.64 41,329 10.83 0.0296
2022-08-10 2022-06-30 13F FORTINET COM 34959E109 659,056 423,764 180.10 37,289 -53.63 0.0278
2022-05-12 2022-03-31 13F FORTINET COM 34959E109 235,292 -115,926 -33.01 80,408 -36.30 0.0489
2022-02-10 2021-12-31 13F FORTINET COM 34959E109 351,218 111,951 46.79 126,228 80.65 0.0676
2021-11-10 2021-09-30 13F FORTINET COM 34959E109 239,267 -166,634 -41.05 69,875 -27.73 0.0413
2021-08-10 2021-06-30 13F FORTINET COM 34959E109 405,901 -6,811 -1.65 96,681 27.02 0.0582
2021-05-13 2021-03-31 13F FORTINET COM 34959E109 412,712 12,337 3.08 76,112 27.99 0.0492
2021-02-11 2020-12-31 13F FORTINET COM 34959E109 400,375 -32,076 -7.42 59,467 16.73 0.0351
2020-11-12 2020-09-30 13F FORTINET COM 34959E109 432,451 -49,372 -10.25 50,946 -22.97 0.0332
2020-08-12 2020-06-30 13F FORTINET COM 34959E109 481,823 10,321 2.19 66,141 38.65 0.0516
2020-05-12 2020-03-31 13F FORTINET COM 34959E109 471,502 -75,798 -13.85 47,702 -18.36 0.0431
2020-02-12 2019-12-31 13F FORTINET COM 34959E109 547,300 59,170 12.12 58,430 55.93 0.0423
2019-11-08 2019-09-30 13F FORTINET COM 34959E109 488,130 145,180 42.33 37,471 42.21 0.0297
2019-08-12 2019-06-30 13F FORTINET COM 34959E109 342,950 31,390 10.08 26,349 0.71 0.0213
2019-05-13 2019-03-31 13F FORTINET COM 34959E109 311,560 -92,470 -22.89 26,162 -8.06 0.0252
2019-02-12 2018-12-31 13F FORTINET COM 34959E109 404,030 -118,622 -22.70 28,456 -40.99 0.0288
2018-11-13 2018-09-30 13F FORTINET COM 34959E109 522,652 5,156 1.00 48,224 49.26 0.0430
2018-08-10 2018-06-30 13F FORTINET COM 34959E109 517,496 271,252 110.16 32,308 144.89 0.0297
2018-05-11 2018-03-31 13F FORTINET COM 34959E109 246,244 8,104 3.40 13,193 26.79 0.0109
2018-02-12 2017-12-31 13F FORTINET COM 34959E109 238,140 -2,918 -1.21 10,405 20.43 0.0083
2017-11-13 2017-09-30 13F FORTINET COM 34959E109 241,058 89,314 58.86 8,640 52.09 0.0071
2017-08-11 2017-06-30 13F FORTINET COM 34959E109 151,744 23,166 18.02 5,681 15.23 0.0051
2017-05-12 2017-03-31 13F FORTINET COM 34959E109 128,578 -7,921 -5.80 4,930 19.92 0.0044
2017-02-10 2016-12-31 13F FORTINET COM 34959E109 136,499 -3,589 -2.56 4,111 -20.55 0.0037
2016-11-10 2016-09-30 13F FORTINET COM 34959E109 140,088 253 0.18 5,174 17.14 0.0048
2016-08-12 2016-06-30 13F FORTINET COM 34959E109 139,835 3,632 2.67 4,417 5.85 0.0045
2016-05-13 2016-03-31 13F FORTINET COM 34959E109 136,203 3,985 3.01 4,173 1.26 0.0047
2016-02-12 2015-12-31 13F FORTINET COM 34959E109 132,218 14,573 12.39 4,121 -17.55 0.0041
2015-11-13 2015-09-30 13F FORTINET COM 34959E109 117,645 87,664 292.40 4,998 303.72 0.0047
2015-08-13 2015-06-30 13F FORTINET COM 34959E109 29,981 7,542 33.61 1,238 57.91 0.0011
2015-05-14 2015-03-31 13F FORTINET COM 34959E109 22,439 -4,339 -16.20 784 -4.51 0.0008
2015-02-17 2014-12-31 13F FORTINET COM 34959E109 26,778 20,067 299.02 821 385.80 0.0007
2014-11-14 2014-09-30 13F FORTINET COM 34959E109 6,711 20 0.30 169 0.00 0.0001
2014-08-14 2014-06-30 13F FORTINET COM 34959E109 6,691 -4,598 -40.73 169 -32.13 0.0002
2014-05-15 2014-03-31 13F FORTINET COM 34959E109 11,289 -69,730 -86.07 249 -83.94 0.0003
2014-02-14 2013-12-31 13F FORTINET COM 34959E109 81,019 26,912 49.74 1,550 41.42 0.0014
2013-11-14 2013-09-30 13F FORTINET COM 34959E109 54,107 48,274 827.60 1,096 964.08 0.0010
2013-08-14 2013-06-30 13F FORTINET COM 34959E109 5,833 5,833 103 0.0001
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
(%)
2026-05-11 2026-03-31 13F FORTINET COM Call 15,000 0.00 1,226 2.85 n/a n/a n/a
2026-02-13 2025-12-31 13F FORTINET COM Call 15,000 0.00 1,191 -5.55 n/a n/a n/a
2025-11-10 2025-09-30 13F FORTINET COM Call 15,000 1,261 n/a n/a n/a
2025-05-12 2025-03-31 13F FORTINET COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-02-12 2024-12-31 13F FORTINET COM Call 52,000 0.00 4,913 21.83 n/a n/a n/a
2024-11-12 2024-09-30 13F FORTINET COM Call 52,000 0.00 4,033 28.65 n/a n/a n/a
2024-08-12 2024-06-30 13F FORTINET COM Call 52,000 -27.78 3,134 -36.27 n/a n/a n/a
2024-05-10 2024-03-31 13F FORTINET COM Call 72,000 -51.94 4,918 -43.90 n/a n/a n/a
2024-02-09 2023-12-31 13F FORTINET COM Call 149,800 368.12 8,768 367.08 n/a n/a n/a
2023-12-06 2023-09-30 13F/A FORTINET COM Call 32,000 1,878 n/a n/a n/a
2023-11-09 2023-09-30 13F FORTINET COM Call 32,000 1,878 n/a n/a n/a
2023-05-11 2023-03-31 13F FORTINET COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2023-02-09 2022-12-31 13F FORTINET COM Call 37,500 0.00 1,833 -0.49 n/a n/a n/a
2022-11-10 2022-09-30 13F FORTINET COM Call 37,500 0.00 1,842 -13.20 n/a n/a n/a
2022-08-10 2022-06-30 13F FORTINET COM Call 37,500 400.00 2,122 -17.21 n/a n/a n/a
2022-05-12 2022-03-31 13F FORTINET COM Call 7,500 0.00 2,563 -4.93 n/a n/a n/a
2022-02-10 2021-12-31 13F FORTINET COM Call 7,500 2,696 n/a n/a n/a
2021-05-13 2021-03-31 13F FORTINET COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2021-02-11 2020-12-31 13F FORTINET COM Call 48,600 36.13 7,219 71.64 n/a n/a n/a
2020-11-12 2020-09-30 13F FORTINET COM Call 35,700 -49.79 4,206 -56.91 n/a n/a n/a
2020-08-12 2020-06-30 13F FORTINET COM Call 71,100 404.26 9,760 584.43 n/a n/a n/a
2020-05-12 2020-03-31 13F FORTINET COM Call 14,100 -38.96 1,426 -42.17 n/a n/a n/a
2020-02-12 2019-12-31 13F FORTINET COM Call 23,100 24.86 2,466 73.66 n/a n/a n/a
2019-11-08 2019-09-30 13F FORTINET COM Call 18,500 38.06 1,420 37.86 n/a n/a n/a
2019-08-12 2019-06-30 13F FORTINET COM Call 13,400 -15.72 1,030 -22.85 n/a n/a n/a
2019-05-13 2019-03-31 13F FORTINET COM Call 15,900 -25.70 1,335 -11.41 n/a n/a n/a
2019-02-12 2018-12-31 13F FORTINET COM Call 21,400 -44.42 1,507 -57.57 n/a n/a n/a
2018-11-13 2018-09-30 13F FORTINET COM Call 38,500 -38.79 3,552 -9.55 n/a n/a n/a
2018-08-10 2018-06-30 13F FORTINET COM Call 62,900 182.06 3,927 228.62 n/a n/a n/a
2018-05-11 2018-03-31 13F FORTINET COM Call 22,300 -23.63 1,195 -6.35 n/a n/a n/a
2018-02-12 2017-12-31 13F FORTINET COM Call 29,200 -11.78 1,276 7.59 n/a n/a n/a
2017-11-13 2017-09-30 13F FORTINET COM Call 33,100 -7.80 1,186 -11.76 n/a n/a n/a
2017-08-11 2017-06-30 13F FORTINET COM Call 35,900 -30.83 1,344 -32.46 n/a n/a n/a
2017-05-12 2017-03-31 13F FORTINET COM Call 51,900 132.74 1,990 196.13 n/a n/a n/a
2017-02-10 2016-12-31 13F FORTINET COM Call 22,300 -20.07 672 -34.76 n/a n/a n/a
2016-11-10 2016-09-30 13F FORTINET COM Call 27,900 136.44 1,030 176.14 n/a n/a n/a
2016-08-12 2016-06-30 13F FORTINET COM Call 11,800 -13.87 373 -11.19 n/a n/a n/a
2016-05-13 2016-03-31 13F FORTINET COM Call 13,700 -73.70 420 -74.14 n/a n/a n/a
2016-02-12 2015-12-31 13F FORTINET COM Call 52,100 21.45 1,624 -10.87 n/a n/a n/a
2015-11-13 2015-09-30 13F FORTINET COM Call 42,900 -1.61 1,822 1.11 n/a n/a n/a
2015-08-13 2015-06-30 13F FORTINET COM Call 43,600 56.27 1,802 84.82 n/a n/a n/a
2015-05-14 2015-03-31 13F FORTINET COM Call 27,900 18.72 975 35.23 n/a n/a n/a
2015-02-17 2014-12-31 13F FORTINET COM Call 23,500 -38.80 721 -25.67 n/a n/a n/a
2014-11-14 2014-09-30 13F FORTINET COM Call 38,400 -67.84 970 -67.68 n/a n/a n/a
2014-08-14 2014-06-30 13F FORTINET COM Call 119,400 -20.19 3,001 -8.95 n/a n/a n/a
2014-05-15 2014-03-31 13F FORTINET COM Call 149,600 320.22 3,296 383.99 n/a n/a n/a
2014-02-14 2013-12-31 13F FORTINET COM Call 35,600 -57.92 681 -60.27 n/a n/a n/a
2013-11-14 2013-09-30 13F FORTINET COM Call 84,600 1,714 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
(%)
2026-05-11 2026-03-31 13F FORTINET COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2026-02-13 2025-12-31 13F FORTINET COM Put 125,000 0.00 9,926 -5.56 n/a n/a n/a
2025-11-10 2025-09-30 13F FORTINET COM Put 125,000 0.00 10,510 -20.47 n/a n/a n/a
2025-08-11 2025-06-30 13F FORTINET COM Put 125,000 108.33 13,215 128.83 n/a n/a n/a
2025-05-12 2025-03-31 13F FORTINET COM Put 60,000 -72.48 5,776 -71.96 n/a n/a n/a
2025-02-12 2024-12-31 13F FORTINET COM Put 218,000 37.97 20,597 68.10 n/a n/a n/a
2024-11-12 2024-09-30 13F FORTINET COM Put 158,000 0.00 12,253 28.67 n/a n/a n/a
2024-08-12 2024-06-30 13F FORTINET COM Put 158,000 -15.96 9,523 -25.85 n/a n/a n/a
2024-05-10 2024-03-31 13F FORTINET COM Put 188,000 0.00 12,842 16.71 n/a n/a n/a
2024-02-09 2023-12-31 13F FORTINET COM Put 188,000 113.64 11,004 113.11 n/a n/a n/a
2023-12-06 2023-09-30 13F/A FORTINET COM Put 88,000 5,164 n/a n/a n/a
2023-11-09 2023-09-30 13F FORTINET COM Put 88,000 5,164 n/a n/a n/a
2022-05-12 2022-03-31 13F FORTINET COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2022-02-10 2021-12-31 13F FORTINET COM Put 2,100 755 n/a n/a n/a
2021-05-13 2021-03-31 13F FORTINET COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2021-02-11 2020-12-31 13F FORTINET COM Put 118,000 -1.09 17,527 24.70 n/a n/a n/a
2020-11-12 2020-09-30 13F FORTINET COM Put 119,300 4.74 14,055 -10.11 n/a n/a n/a
2020-08-12 2020-06-30 13F FORTINET COM Put 113,900 607.45 15,635 859.79 n/a n/a n/a
2020-05-12 2020-03-31 13F FORTINET COM Put 16,100 -46.33 1,629 -49.14 n/a n/a n/a
2020-02-12 2019-12-31 13F FORTINET COM Put 30,000 -18.70 3,203 13.10 n/a n/a n/a
2019-11-08 2019-09-30 13F FORTINET COM Put 36,900 24.24 2,832 24.10 n/a n/a n/a
2019-08-12 2019-06-30 13F FORTINET COM Put 29,700 -12.39 2,282 -19.85 n/a n/a n/a
2019-05-13 2019-03-31 13F FORTINET COM Put 33,900 -11.26 2,847 5.84 n/a n/a n/a
2019-02-12 2018-12-31 13F FORTINET COM Put 38,200 -23.60 2,690 -41.70 n/a n/a n/a
2018-11-13 2018-09-30 13F FORTINET COM Put 50,000 264.96 4,614 439.65 n/a n/a n/a
2018-08-10 2018-06-30 13F FORTINET COM Put 13,700 -6.80 855 8.50 n/a n/a n/a
2018-05-11 2018-03-31 13F FORTINET COM Put 14,700 -69.75 788 -62.88 n/a n/a n/a
2018-02-12 2017-12-31 13F FORTINET COM Put 48,600 -36.47 2,123 -22.55 n/a n/a n/a
2017-11-13 2017-09-30 13F FORTINET COM Put 76,500 71.14 2,741 63.74 n/a n/a n/a
2017-08-11 2017-06-30 13F FORTINET COM Put 44,700 106.94 1,674 102.17 n/a n/a n/a
2017-05-12 2017-03-31 13F FORTINET COM Put 21,600 27.06 828 61.72 n/a n/a n/a
2017-02-10 2016-12-31 13F FORTINET COM Put 17,000 4.94 512 -14.38 n/a n/a n/a
2016-11-10 2016-09-30 13F FORTINET COM Put 16,200 -1.82 598 14.78 n/a n/a n/a
2016-08-12 2016-06-30 13F FORTINET COM Put 16,500 -3.51 521 -0.57 n/a n/a n/a
2016-05-13 2016-03-31 13F FORTINET COM Put 17,100 -27.54 524 -28.80 n/a n/a n/a
2016-02-12 2015-12-31 13F FORTINET COM Put 23,600 72.26 736 26.46 n/a n/a n/a
2015-11-13 2015-09-30 13F FORTINET COM Put 13,700 6.20 582 9.19 n/a n/a n/a
2015-08-13 2015-06-30 13F FORTINET COM Put 12,900 -36.76 533 -25.25 n/a n/a n/a
2015-05-14 2015-03-31 13F FORTINET COM Put 20,400 -28.67 713 -18.70 n/a n/a n/a
2015-02-17 2014-12-31 13F FORTINET COM Put 28,600 -6.23 877 13.75 n/a n/a n/a
2014-11-14 2014-09-30 13F FORTINET COM Put 30,500 5.90 771 6.49 n/a n/a n/a
2014-08-14 2014-06-30 13F FORTINET COM Put 28,800 -35.28 724 -26.12 n/a n/a n/a
2014-05-15 2014-03-31 13F FORTINET COM Put 44,500 -34.46 980 -24.56 n/a n/a n/a
2014-02-14 2013-12-31 13F FORTINET COM Put 67,900 870.00 1,299 814.79 n/a n/a n/a
2013-11-14 2013-09-30 13F FORTINET COM Put 7,000 142 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.