Fortinet, Inc.
US ˙ NasdaqGS ˙ US34959E1091

SecurityFTNT / Fortinet, Inc.
InstitutionWestpac Banking Corp
Latest Disclosed Ownership2,989 shares
Latest Disclosed Value $ 244,261
Westpac Banking Corp ownership in FTNT / Fortinet, Inc.

On May 11, 2026 - Westpac Banking Corp filed a 13F-HR form disclosing ownership of 2,989 shares of Fortinet, Inc. (US:FTNT) valued at $244,261 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 2,989 shares of Fortinet, Inc.. This represents a change in shares of 0.00% during the quarter. The current value of the position is $437,829 USD.

Westpac Banking Corp has a history of taking positions in derivatives of the underlying security (FTNT) in the form of stock options.

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)
2026-05-11 2026-03-31 13F FORTINET COM 34959E109 2,989 0 0.00 244 2.95 0.0085
2026-02-10 2025-12-31 13F FORTINET COM 34959E109 2,989 637 27.08 237 20.30 0.0150
2025-11-14 2025-09-30 13F/A-1 FORTINET INC USD 0.001 COM 34959E109 2,352 -21,226 -90.02 198 -92.09 0.0123
2025-11-12 2025-09-30 13F FORTINET INC USD 0.001 COM 34959E109 2,352 -21,226 198 0.0050
2025-08-11 2025-06-30 13F FORTINET COM 34959E109 23,578 401 1.73 2,493 11.70 0.1666
2025-05-13 2025-03-31 13F FORTINET COM 34959E109 23,177 -2,544 -9.89 2,231 -8.19 0.1641
2025-02-12 2024-12-31 13F FORTINET COM 34959E109 25,721 -911 -3.42 2,430 17.68 0.1613
2024-11-08 2024-09-30 13F FORTINET COM 34959E109 26,632 12,054 82.69 2,065 135.19 0.1385
2024-08-14 2024-06-30 13F/A-1 FORTINET COM 34959E109 14,578 -16,422 -52.97 879 -58.53 0.0697
2024-08-13 2024-06-30 13F FORTINET COM 34959E109 12,270 -18,730 879 0.0302
2024-05-09 2024-03-31 13F FORTINET COM 34959E109 31,000 20,628 198.88 2,118 248.76 0.1613
2024-02-08 2023-12-31 13F FORTINET COM 34959E109 10,372 -10,695 -50.77 607 -50.89 0.0500
2023-11-13 2023-09-30 13F FORTINET COM 34959E109 21,067 19,092 966.68 1,236 729.53 0.0925
2023-08-10 2023-06-30 13F FORTINET COM 34959E109 1,975 586 42.19 149 61.96 0.0105
2023-05-04 2023-03-31 13F FORTINET COM 349590000 1,389 -49,961 -97.30 92 -96.33 0.0012
2023-02-06 2022-12-31 13F FORTINET COM 34959E109 51,350 0 0.00 2,511 -0.48 0.0371
2023-02-06 2022-12-31 13F FORTINET COM 349590000 1,389 68
2022-11-08 2022-09-30 13F FORTINET COM 34959E109 51,350 0 0.00 2,523 -13.18 0.0385
2022-08-10 2022-06-30 13F FORTINET COM 34959E109 51,350 41,080 400.00 2,905 -17.21 0.0379
2022-05-11 2022-03-31 13F FORTINET COM 34959E109 10,270 10,270 3,510 0.0403
2021-10-27 2021-09-30 13F FORTINET COM 34959E109 0 -10,270 -100.00 0 -100.00
2021-08-11 2021-06-30 13F FORTINET COM 34959E109 10,270 10,270 2,446 0.0246
2021-02-11 2020-12-31 13F FORTINET COM 34959E109 0 -12,355 -100.00 0 -100.00
2020-11-10 2020-09-30 13F FORTINET COM 34959E109 12,355 0 0.00 1,456 -14.16 0.0197
2020-08-12 2020-06-30 13F FORTINET COM 34959E109 12,355 9,007 269.03 1,696 401.48 0.0253
2020-05-14 2020-03-31 13F FORTINET COM 34959E109 3,348 -10,270 -75.41 339 -76.74 0.0058
2020-02-11 2019-12-31 13F FORTINET COM 34959E109 13,618 -11,319 -45.39 1,454 -24.13 0.0187
2019-08-01 2019-06-30 13F FORTINET COM 34959E109 24,937 0 0.00 1,916 -8.50 0.0293
2019-05-14 2019-03-31 13F FORTINET COM 34959E109 24,937 0 0.00 2,094 19.19 0.0346
2019-02-07 2018-12-31 13F FORTINET COM 34959E109 24,937 9,859 65.39 1,756 26.24 0.0299
2018-11-13 2018-09-30 13F FORTINET COM 34959E109 15,078 5,130 51.57 1,391 123.99 0.0239
2018-07-18 2018-06-30 13F FORTINET COM 34959E109 9,948 2,199 28.38 621 49.64 0.0119
2018-05-01 2018-03-31 13F FORTIVE COM 34959E109 7,749 0 0.00 415 22.78 0.0083
2018-01-18 2017-12-31 13F FORTINET COM 34959E109 7,749 0 0.00 339 22.02 0.0077
2017-10-30 2017-09-30 13F FORTINET COM 34959E109 7,749 0 0.00 278 -4.48 0.0061
2017-08-09 2017-06-30 13F FORTINET COM 34959E109 7,749 -11,370 -59.47 290 -60.44 0.0064
2017-05-18 2017-03-31 13F/A-1 FORTINET COM 34959E109 19,119 -22 -0.11 733 23.82 0.0059
2017-05-11 2017-03-31 13F FORTINET COM 34959E109 17,107 612
2017-02-09 2016-12-31 13F FORTINET COM 34959E109 19,141 -268 -1.38 593 -17.32 0.0056
2016-11-10 2016-09-30 13F FORTINET COM 34959E109 19,409 -37,055 -65.63 717 -56.31 0.0077
2016-08-10 2016-06-30 13F FORTINET COM 34959E109 56,464 43,831 346.96 1,640 324.61 0.0180
2016-05-13 2016-03-31 13F FORTINET COM 34959E109 12,633 0 0.00 387 -1.78 0.0042
2016-02-11 2015-12-31 13F FORTINET COM 34959E109 12,633 7,189 132.05 394 70.13 0.0044
2015-11-16 2015-09-30 13F/A-1 FORTINET COM 34959E109 5,444 1,960 56.26 231 61.54 0.0025
2015-11-12 2015-09-30 13F FORTINET COM 34959E109 5,444 231
2015-08-12 2015-06-30 13F FORTINET COM 34959E109 3,484 -4,287 -55.17 144 -47.23 0.0014
2015-05-12 2015-03-31 13F FORTINET COM 34959E109 7,771 -8,921 -53.44 272 -46.97 0.0024
2015-02-11 2014-12-31 13F FORTINET PUT 34959E959 0 -12,898 -100.00 0 -100.00
2015-02-11 2014-12-31 13F FORTINET COM 34959E109 16,692 3,794 29.42 512 57.23 0.0049
2014-11-12 2014-09-30 13F FORTINET PUT 34959E959 12,898 12,898 326 0.0032
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
(%)
2015-02-11 2014-12-31 13F FORTINET PUT 0 -100.00 0 -100.00 n/a n/a n/a
2014-11-12 2014-09-30 13F FORTINET PUT 12,898 326 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.