Palo Alto Networks, Inc.
CH ˙ SWX ˙ US6974351057
SecurityCH:PANW / Palo Alto Networks, Inc.
InstitutionRhumbline Advisers
Latest Disclosed Ownership1,389,174 shares
Latest Disclosed Value $ 222,712,248
Rhumbline Advisers reports 17.21% increase in ownership of PANW / Palo Alto Networks, Inc.

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 1,389,174 shares of Palo Alto Networks, Inc. (CH:PANW) valued at $222,712,248 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,185,226 shares of Palo Alto Networks, Inc.. This represents a change in shares of 17.21% 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 PALO ALTO NETWORKS INC COM COM 697435105 1,389,174 203,948 17.21 222,712 2.01 0.1905
2026-02-13 2025-12-31 13F PALO ALTO NETWORKS INC COM COM 697435105 1,185,226 -10,553 -0.88 218,319 -10.34 0.1765
2025-11-06 2025-09-30 13F PALO ALTO NETWORKS INC COM COM 697435105 1,195,779 -8,495 -0.71 243,484 -1.20 0.1955
2025-08-12 2025-06-30 13F PALO ALTO NETWORKS INC COM COM 697435105 1,204,274 -2,278 -0.19 246,443 19.70 0.2110
2025-05-29 2025-03-31 13F/A-1 PALO ALTO NETWORKS INC COM COM 697435105 1,206,552 26,264 2.23 205,886 -4.13 0.1926
2025-04-08 2025-03-31 13F PALO ALTO NETWORKS INC COM COM 697435105 1,206,552 26,264 205,886 0.1926
2025-05-29 2024-12-31 13F/A-1 PALO ALTO NETWORKS INC COM COM 697435105 1,180,288 595,942 101.98 214,765 7.53 0.1921
2025-01-30 2024-12-31 13F PALO ALTO NETWORKS INC COM COM 697435105 1,180,288 595,942 214,765 0.1921
2024-11-12 2024-09-30 13F PALO ALTO NETWORKS INC COM COM 697435105 584,346 -10,641 -1.79 199,729 -0.98 0.1802
2024-08-01 2024-06-30 13F PALO ALTO NETWORKS INC COM COM 697435105 594,987 -1,052 -0.18 201,706 19.10 0.1896
2024-05-09 2024-03-31 13F PALO ALTO NETWORKS INC COM COM 697435105 596,039 28,175 4.96 169,352 1.14 0.1626
2024-02-08 2023-12-31 13F PALO ALTO NETWORKS INC COM COM 697435105 567,864 3,081 0.55 167,452 26.47 0.1755
2023-11-09 2023-09-30 13F PALO ALTO NETWORKS INC COM COM 697435105 564,783 9,711 1.75 132,408 -6.64 0.1537
2023-08-08 2023-06-30 13F PALO ALTO NETWORKS INC COM COM 697435105 555,072 228,198 69.81 141,826 218,093.85 0.1589
2023-05-11 2023-03-31 13F PALO ALTO NETWORKS INC COM COM 697435105 326,874 16,483 5.31 65 -99.85 0.0806
2023-02-14 2022-12-31 13F PALO ALTO NETWORKS INC COM COM 697435105 310,391 16,385 5.57 43,312 -10.06 0.0582
2022-11-10 2022-09-30 13F PALO ALTO NETWORKS INC COM COM 697435105 294,006 201,853 219.04 48,155 5.79 0.0717
2022-08-11 2022-06-30 13F PALO ALTO NETWORKS INC COM COM 697435105 92,153 3,069 3.45 45,518 -17.92 0.0664
2022-05-12 2022-03-31 13F PALO ALTO NETWORKS INC COM COM 697435105 89,084 -3,611 -3.90 55,456 7.45 0.0714
2022-02-10 2021-12-31 13F PALO ALTO NETWORKS INC COM COM 697435105 92,695 2,631 2.92 51,609 19.63 0.0633
2021-11-12 2021-09-30 13F PALO ALTO NETWORKS INC COM COM 697435105 90,064 -880 -0.97 43,141 27.84 0.0584
2021-08-05 2021-06-30 13F PALO ALTO NETWORKS INC COM COM 697435105 90,944 -6,082 -6.27 33,745 7.99 0.0443
2021-05-06 2021-03-31 13F PALO ALTO NETWORKS INC COM COM 697435105 97,026 -4,306 -4.25 31,248 -13.23 0.0425
2021-02-10 2020-12-31 13F PALO ALTO NETWORKS INC COM COM 697435105 101,332 -4,972 -4.68 36,012 38.41 0.0497
2020-11-12 2020-09-30 13F PALO ALTO NETWORKS INC COM COM 697435105 106,304 -7,313 -6.44 26,018 -0.29 0.0408
2020-08-13 2020-06-30 13F PALO ALTO NETWORKS INC COM COM 697435105 113,617 19,439 20.64 26,094 68.99 0.0436
2020-05-06 2020-03-31 13F PALO ALTO NETWORKS INC COM COM 697435105 94,178 -1,863 -1.94 15,441 -30.47 0.0324
2020-02-05 2019-12-31 13F PALO ALTO NETWORKS INC COM COM 697435105 96,041 3,628 3.93 22,209 17.90 0.0371
2019-10-23 2019-09-30 13F PALO ALTO NETWORKS INC COM COM 697435105 92,413 804 0.88 18,837 0.92 0.0344
2019-08-14 2019-06-30 13F PALO ALTO NETWORKS INC COM COM 697435105 91,609 2,481 2.78 18,666 -13.77 0.0350
2019-05-01 2019-03-31 13F PALO ALTO NETWORKS INC COM COM 697435105 89,128 -358 -0.40 21,647 28.43 0.0419
2019-01-31 2018-12-31 13F PALO ALTO NETWORKS INC COM COM 697435105 89,486 -3,226 -3.48 16,855 -19.29 0.0367
2018-11-07 2018-09-30 13F PALO ALTO NETWORKS INC COM COM 697435105 92,712 -1,268 -1.35 20,884 8.15 0.0403
2018-08-06 2018-06-30 13F PALO ALTO NETWORKS INC COM COM 697435105 93,980 -7,079 -7.00 19,310 5.27 0.0389
2018-05-02 2018-03-31 13F PALO ALTO NETWORKS INC COM COM 697435105 101,059 -3,111 -2.99 18,344 21.50 0.0383
2018-02-09 2017-12-31 13F PALO ALTO NETWORKS INC COM COM 697435105 104,170 -1,173 -1.11 15,098 -0.54 0.0307
2017-11-06 2017-09-30 13F PALO ALTO NETWORKS INC COM COM 697435105 105,343 -964 -0.91 15,180 6.71 0.0330
2017-08-02 2017-06-30 13F PALO ALTO NETWORKS INC COM COM 697435105 106,307 -1,138 -1.06 14,225 17.49 0.0325
2017-05-02 2017-03-31 13F PALO ALTO NETWORKS INC COM COM 697435105 107,445 8,489 8.58 12,107 -2.16 0.0283
2017-01-27 2016-12-31 13F PALO ALTO NETWORKS INC COM COM 697435105 98,956 12,540 14.51 12,374 -10.13 0.0314
2016-11-08 2016-09-30 13F PALO ALTO NETWORKS INC COM COM 697435105 86,416 4,136 5.03 13,769 36.45 0.0379
2016-08-11 2016-06-30 13F PALO ALTO NETWORKS INC COM COM 697435105 82,280 17,532 27.08 10,091 -4.47 0.0299
2016-05-02 2016-03-31 13F PALO ALTO NETWORKS COM 697435105 64,748 -259 -0.40 10,563 -7.75 0.0328
2016-02-03 2015-12-31 13F PALO ALTO NETWORKS COM 697435105 65,007 1,374 2.16 11,450 4.61 0.0368
2015-11-04 2015-09-30 13F PALO ALTO NETWORKS COM 697435105 63,633 3,299 5.47 10,945 3.84 0.0372
2015-08-04 2015-06-30 13F PALO ALTO NETWORKS COM 697435105 60,334 17,885 42.13 10,540 69.97 0.0336
2015-05-12 2015-03-31 13F PALO ALTO NETWORKS COM 697435105 42,449 1,981 4.90 6,201 25.02 0.0179
2015-02-06 2014-12-31 13F PALO ALTO NETWORKS COM 697435105 40,468 1,826 4.73 4,960 30.84 0.0144
2014-11-12 2014-09-30 13F PALO ALTO NETWORKS COM 697435105 38,642 197 0.51 3,791 17.59 0.0114
2014-08-06 2014-06-30 13F PALO ALTO NETWORKS COM 697435105 38,445 13,721 55.50 3,224 90.09 0.0095
2014-05-06 2014-03-31 13F PALO ALTO NETWORKS COM 697435105 24,724 -1,521 -5.80 1,696 12.47 0.0050
2014-02-03 2013-12-31 13F PALO ALTO NETWORKS COM 697435105 26,245 -2,660 -9.20 1,508 13.90 0.0044
2013-11-05 2013-09-30 13F PALO ALTO NETWORKS COM 697435105 28,905 -280 -0.96 1,324 7.64 0.0041
2013-08-07 2013-06-30 13F PALO ALTO NETWORKS COM 697435105 29,185 29,185 1,230 0.0040
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.