F5, Inc.
US ˙ NasdaqGS ˙ US3156161024

SecurityFFIV / F5, Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership188,811 shares
Latest Disclosed Value $ 54,628,687
Citigroup Inc ownership in FFIV / F5, Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 188,811 shares of F5, Inc. (US:FFIV) valued at $54,628,687 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 79,284 shares of F5, Inc.. This represents a change in shares of 138.15% during the quarter. The current value of the position is $76,593,070 USD.

Citigroup Inc has a history of taking positions in derivatives of the underlying security (FFIV) 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.

FFIV / F5, 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 F5 COM 315616102 188,811 109,527 138.15 54,629 169.93 0.0117
2026-02-13 2025-12-31 13F F5 COM 315616102 79,284 13,457 20.44 20,238 -4.87 0.0089
2025-11-10 2025-09-30 13F F5 COM 315616102 65,827 -16,912 -20.44 21,275 -12.64 0.0095
2025-08-11 2025-06-30 13F F5 COM 315616102 82,739 -5,102 -5.81 24,352 4.11 0.0120
2025-05-12 2025-03-31 13F F5 COM 315616102 87,841 16,456 23.05 23,389 30.29 0.0120
2025-02-12 2024-12-31 13F F5 COM 315616102 71,385 -60,049 -45.69 17,951 -37.97 0.0106
2024-11-12 2024-09-30 13F F5 COM 315616102 131,434 -29,279 -18.22 28,942 4.56 0.0168
2024-08-12 2024-06-30 13F F5 COM 315616102 160,713 39,730 32.84 27,680 20.67 0.0177
2024-05-10 2024-03-31 13F F5 COM 315616102 120,983 -1,478 -1.21 22,937 4.65 0.0151
2024-02-09 2023-12-31 13F F5 COM 315616102 122,461 8,111 7.09 21,918 18.95 0.0154
2023-12-06 2023-09-30 13F/A-1 F5 COM 315616102 114,350 11,863 11.58 18,426 22.93 0.0138
2023-11-09 2023-09-30 13F F5 COM 315616102 114,350 11,863 18,426 0.0055
2023-08-10 2023-06-30 13F F5 COM 315616102 102,487 6,839 7.15 14,990 7.57 0.0098
2023-05-11 2023-03-31 13F F5 COM 315616102 95,648 14,300 17.58 13,935 19.36 0.0098
2023-02-09 2022-12-31 13F F5 COM 315616102 81,348 8,965 12.39 11,674 11.44 0.0093
2022-11-10 2022-09-30 13F F5 COM 315616102 72,383 3,033 4.37 10,476 -1.29 0.0075
2022-08-10 2022-06-30 13F F5 COM 315616102 69,350 -13,429 -16.22 10,613 -38.64 0.0079
2022-05-12 2022-03-31 13F F5 COM 315616102 82,779 8,658 11.68 17,297 -4.64 0.0105
2022-02-10 2021-12-31 13F F5 COM 315616102 74,121 -13,979 -15.87 18,139 3.57 0.0097
2021-11-10 2021-09-30 13F F5 NETWORKS COM 315616102 88,100 -14,604 -14.22 17,513 -8.64 0.0103
2021-08-10 2021-06-30 13F F5 NETWORKS COM 315616102 102,704 2,867 2.87 19,170 -7.96 0.0115
2021-05-13 2021-03-31 13F F5 NETWORKS COM 315616102 99,837 -14,188 -12.44 20,827 3.81 0.0135
2021-02-11 2020-12-31 13F F5 NETWORKS COM 315616102 114,025 -42,893 -27.33 20,062 4.14 0.0118
2020-11-12 2020-09-30 13F F5 NETWORKS COM 315616102 156,918 19,814 14.45 19,265 0.74 0.0126
2020-08-12 2020-06-30 13F F5 NETWORKS COM 315616102 137,104 21,815 18.92 19,123 55.55 0.0149
2020-05-12 2020-03-31 13F F5 NETWORKS COM 315616102 115,289 2,533 2.25 12,294 -21.93 0.0111
2020-02-12 2019-12-31 13F F5 NETWORKS COM 315616102 112,756 -26,164 -18.83 15,747 -19.28 0.0114
2019-11-08 2019-09-30 13F F5 NETWORKS COM 315616102 138,920 -32,148 -18.79 19,507 -21.70 0.0155
2019-08-12 2019-06-30 13F F5 NETWORKS COM 315616102 171,068 -43,953 -20.44 24,913 -26.17 0.0201
2019-05-13 2019-03-31 13F F5 NETWORKS COM 315616102 215,021 81,622 61.19 33,743 56.11 0.0325
2019-02-12 2018-12-31 13F F5 NETWORKS COM 315616102 133,399 29,148 27.96 21,615 3.97 0.0219
2018-11-13 2018-09-30 13F F5 NETWORKS COM 315616102 104,251 -47,561 -31.33 20,789 -20.59 0.0185
2018-08-10 2018-06-30 13F F5 NETWORKS COM 315616102 151,812 -116,271 -43.37 26,180 -32.47 0.0241
2018-05-11 2018-03-31 13F F5 NETWORKS COM 315616102 268,083 108,675 68.17 38,768 85.33 0.0319
2018-02-12 2017-12-31 13F F5 NETWORKS COM 315616102 159,408 -16,775 -9.52 20,918 -1.52 0.0168
2017-11-13 2017-09-30 13F F5 NETWORKS COM 315616102 176,183 65,118 58.63 21,241 50.53 0.0174
2017-08-11 2017-06-30 13F F5 NETWORKS COM 315616102 111,065 76,549 221.78 14,111 186.81 0.0127
2017-05-12 2017-03-31 13F F5 NETWORKS COM 315616102 34,516 -10,209 -22.83 4,920 -23.99 0.0044
2017-02-10 2016-12-31 13F F5 NETWORKS COM 315616102 44,725 21,609 93.48 6,473 124.68 0.0058
2016-11-10 2016-09-30 13F F5 NETWORKS COM 315616102 23,116 5,945 34.62 2,881 47.29 0.0027
2016-08-12 2016-06-30 13F F5 NETWORKS COM 315616102 17,171 2,724 18.86 1,956 27.84 0.0020
2016-05-13 2016-03-31 13F F5 NETWORKS COM 315616102 14,447 -12,832 -47.04 1,530 -42.16 0.0017
2016-02-12 2015-12-31 13F F5 NETWORKS COM 315616102 27,279 -7,291 -21.09 2,645 -33.91 0.0026
2015-11-13 2015-09-30 13F F5 NETWORKS COM 315616102 34,570 -1,134 -3.18 4,002 -6.87 0.0037
2015-08-13 2015-06-30 13F F5 NETWORKS COM 315616102 35,704 3,878 12.19 4,297 17.47 0.0038
2015-05-14 2015-03-31 13F F5 NETWORKS COM 315616102 31,826 8,194 34.67 3,658 18.61 0.0035
2015-02-17 2014-12-31 13F F5 NETWORKS COM 315616102 23,632 -3,803 -13.86 3,084 -5.34 0.0028
2014-11-14 2014-09-30 13F F5 NETWORKS COM 315616102 27,435 -35,423 -56.35 3,258 -53.49 0.0028
2014-08-14 2014-06-30 13F F5 NETWORKS COM 315616102 62,858 30,015 91.39 7,005 100.03 0.0067
2014-05-15 2014-03-31 13F F5 NETWORKS COM 315616102 32,843 -89,277 -73.11 3,502 -68.44 0.0036
2014-02-14 2013-12-31 13F F5 NETWORKS COM 315616102 122,120 74,773 157.93 11,096 173.30 0.0100
2013-11-14 2013-09-30 13F F5 NETWORKS COM 315616102 47,347 -32,595 -40.77 4,060 -26.17 0.0038
2013-08-14 2013-06-30 13F F5 NETWORKS COM 315616102 79,942 79,942 5,499 0.0054
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
(%)
2021-05-13 2021-03-31 13F F5 NETWORKS COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2021-02-11 2020-12-31 13F F5 NETWORKS COM Call 30,900 9.57 5,437 57.05 n/a n/a n/a
2020-11-12 2020-09-30 13F F5 NETWORKS COM Call 28,200 -6.31 3,462 -17.53 n/a n/a n/a
2020-08-12 2020-06-30 13F F5 NETWORKS COM Call 30,100 -40.40 4,198 -22.04 n/a n/a n/a
2020-05-12 2020-03-31 13F F5 NETWORKS COM Call 50,500 1.41 5,385 -22.57 n/a n/a n/a
2020-02-12 2019-12-31 13F F5 NETWORKS COM Call 49,800 2.47 6,955 1.92 n/a n/a n/a
2019-11-08 2019-09-30 13F F5 NETWORKS COM Call 48,600 34.25 6,824 29.44 n/a n/a n/a
2019-08-12 2019-06-30 13F F5 NETWORKS COM Call 36,200 -1.36 5,272 -8.46 n/a n/a n/a
2019-05-13 2019-03-31 13F F5 NETWORKS COM Call 36,700 -18.98 5,759 -21.54 n/a n/a n/a
2019-02-12 2018-12-31 13F F5 NETWORKS COM Call 45,300 32.46 7,340 7.62 n/a n/a n/a
2018-11-13 2018-09-30 13F F5 NETWORKS COM Call 34,200 -12.76 6,820 0.89 n/a n/a n/a
2018-08-10 2018-06-30 13F F5 NETWORKS COM Call 39,200 -22.07 6,760 -7.07 n/a n/a n/a
2018-05-11 2018-03-31 13F F5 NETWORKS COM Call 50,300 -52.05 7,274 -47.16 n/a n/a n/a
2018-02-12 2017-12-31 13F F5 NETWORKS COM Call 104,900 0.48 13,765 9.37 n/a n/a n/a
2017-11-13 2017-09-30 13F F5 NETWORKS COM Call 104,400 -15.47 12,586 -19.79 n/a n/a n/a
2017-08-11 2017-06-30 13F F5 NETWORKS COM Call 123,500 31.38 15,692 17.09 n/a n/a n/a
2017-05-12 2017-03-31 13F F5 NETWORKS COM Call 94,000 -13.68 13,402 -14.96 n/a n/a n/a
2017-02-10 2016-12-31 13F F5 NETWORKS COM Call 108,900 -20.04 15,760 -7.16 n/a n/a n/a
2016-11-10 2016-09-30 13F F5 NETWORKS COM Call 136,200 11.09 16,976 21.63 n/a n/a n/a
2016-08-12 2016-06-30 13F F5 NETWORKS COM Call 122,600 226.93 13,957 251.65 n/a n/a n/a
2016-05-13 2016-03-31 13F F5 NETWORKS COM Call 37,500 146.71 3,969 169.27 n/a n/a n/a
2016-02-12 2015-12-31 13F F5 NETWORKS COM Call 15,200 -68.33 1,474 -73.48 n/a n/a n/a
2015-11-13 2015-09-30 13F F5 NETWORKS COM Call 48,000 -7.34 5,558 -10.84 n/a n/a n/a
2015-08-13 2015-06-30 13F F5 NETWORKS COM Call 51,800 -25.68 6,234 -22.18 n/a n/a n/a
2015-05-14 2015-03-31 13F F5 NETWORKS COM Call 69,700 0.72 8,011 -11.26 n/a n/a n/a
2015-02-17 2014-12-31 13F F5 NETWORKS COM Call 69,200 -30.66 9,028 -23.81 n/a n/a n/a
2014-11-14 2014-09-30 13F F5 NETWORKS COM Call 99,800 18,837.38 11,850 19,984.75 n/a n/a n/a
2014-08-14 2014-06-30 13F F5 NETWORKS COM Call 527 59 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
(%)
2021-05-13 2021-03-31 13F F5 NETWORKS COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2021-02-11 2020-12-31 13F F5 NETWORKS COM Put 34,700 11.58 6,105 59.90 n/a n/a n/a
2020-11-12 2020-09-30 13F F5 NETWORKS COM Put 31,100 -40.19 3,818 -47.36 n/a n/a n/a
2020-08-12 2020-06-30 13F F5 NETWORKS COM Put 52,000 -21.45 7,253 2.75 n/a n/a n/a
2020-05-12 2020-03-31 13F F5 NETWORKS COM Put 66,200 46.78 7,059 12.08 n/a n/a n/a
2020-02-12 2019-12-31 13F F5 NETWORKS COM Put 45,100 58.25 6,298 57.37 n/a n/a n/a
2019-11-08 2019-09-30 13F F5 NETWORKS COM Put 28,500 -12.04 4,002 -15.18 n/a n/a n/a
2019-08-12 2019-06-30 13F F5 NETWORKS COM Put 32,400 -12.90 4,718 -19.18 n/a n/a n/a
2019-05-13 2019-03-31 13F F5 NETWORKS COM Put 37,200 -52.19 5,838 -53.69 n/a n/a n/a
2019-02-12 2018-12-31 13F F5 NETWORKS COM Put 77,800 13.41 12,606 -7.85 n/a n/a n/a
2018-11-13 2018-09-30 13F F5 NETWORKS COM Put 68,600 -15.93 13,680 -2.79 n/a n/a n/a
2018-08-10 2018-06-30 13F F5 NETWORKS COM Put 81,600 -2.51 14,072 16.26 n/a n/a n/a
2018-05-11 2018-03-31 13F F5 NETWORKS COM Put 83,700 78.85 12,104 97.10 n/a n/a n/a
2018-02-12 2017-12-31 13F F5 NETWORKS COM Put 46,800 -45.58 6,141 -40.77 n/a n/a n/a
2017-11-13 2017-09-30 13F F5 NETWORKS COM Put 86,000 24.64 10,368 18.26 n/a n/a n/a
2017-08-11 2017-06-30 13F F5 NETWORKS COM Put 69,000 153.68 8,767 126.07 n/a n/a n/a
2017-05-12 2017-03-31 13F F5 NETWORKS COM Put 27,200 -38.46 3,878 -39.38 n/a n/a n/a
2017-02-10 2016-12-31 13F F5 NETWORKS COM Put 44,200 15.40 6,397 34.00 n/a n/a n/a
2016-11-10 2016-09-30 13F F5 NETWORKS COM Put 38,300 -13.93 4,774 -5.75 n/a n/a n/a
2016-08-12 2016-06-30 13F F5 NETWORKS COM Put 44,500 49.83 5,065 61.10 n/a n/a n/a
2016-05-13 2016-03-31 13F F5 NETWORKS COM Put 29,700 -52.93 3,144 -48.61 n/a n/a n/a
2016-02-12 2015-12-31 13F F5 NETWORKS COM Put 63,100 -9.08 6,118 -23.88 n/a n/a n/a
2015-11-13 2015-09-30 13F F5 NETWORKS COM Put 69,400 27.11 8,037 22.31 n/a n/a n/a
2015-08-13 2015-06-30 13F F5 NETWORKS COM Put 54,600 -2.85 6,571 1.72 n/a n/a n/a
2015-05-14 2015-03-31 13F F5 NETWORKS COM Put 56,200 -61.37 6,460 -65.97 n/a n/a n/a
2015-02-17 2014-12-31 13F F5 NETWORKS COM Put 145,500 3.85 18,983 14.11 n/a n/a n/a
2014-11-14 2014-09-30 13F F5 NETWORKS COM Put 140,100 8,585.68 16,635 9,141.67 n/a n/a n/a
2014-08-14 2014-06-30 13F F5 NETWORKS COM Put 1,613 180 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.