Zscaler, Inc.
US ˙ NasdaqGS ˙ US98980G1022

SecurityZS / Zscaler, Inc.
InstitutionJanus Henderson Group Plc
Latest Disclosed Ownership541,671 shares
Latest Disclosed Value $ 76,004,567
Janus Henderson Group Plc reports 47.03% increase in ownership of ZS / Zscaler, Inc.

On May 18, 2026 - Janus Henderson Group Plc filed a 13F-HR/A form disclosing ownership of 541,671 shares of Zscaler, Inc. (US:ZS) valued at $75,991,025 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 368,403 shares of Zscaler, Inc.. This represents a change in shares of 47.03% during the quarter. The current value of the position is $72,784,332 USD.

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)
2026-05-18 2026-03-31 13F/A-1 ZSCALER COM 98980G102 541,671 173,268 47.03 76,005 -8.29 0.0363
2026-05-15 2026-03-31 13F ZSCALER COM 98980G102 541,671 173,268 76,005 0.0141
2026-02-17 2025-12-31 13F ZSCALER COM 98980G102 368,403 86,720 30.79 82,872 -1.89 0.0371
2025-11-14 2025-09-30 13F ZSCALER COM 98980G102 281,683 272,367 2,923.65 84,471 2,786.91 0.0386
2025-08-14 2025-06-30 13F ZSCALER COM 98980G102 9,316 872 10.33 2,926 67.30 0.0014
2025-05-15 2025-03-31 13F ZSCALER COM 98980G102 8,444 -867 -9.31 1,749 4.11 0.0010
2025-02-14 2024-12-31 13F ZSCALER COM 98980G102 9,311 -133 -1.41 1,680 4.09 0.0009
2024-11-14 2024-09-30 13F ZSCALER COM 98980G102 9,444 782 9.03 1,614 -3.00 0.0008
2024-08-14 2024-06-30 13F ZSCALER COM 98980G102 8,662 -459 -5.03 1,665 -5.24 0.0009
2024-05-15 2024-03-31 13F ZSCALER COM 98980G102 9,121 963 11.80 1,757 -2.82 0.0010
2024-02-14 2023-12-31 13F ZSCALER COM 98980G102 8,158 -64 -0.78 1,808 41.28 0.0011
2023-11-14 2023-09-30 13F ZSCALER COM 98980G102 8,222 -1,502 -15.45 1,280 -10.06 0.0008
2023-08-14 2023-06-30 13F ZSCALER COM 98980G102 9,724 -745 -7.12 1,423 16.37 0.0009
2023-05-15 2023-03-31 13F ZSCALER COM 98980G102 10,469 18 0.17 1,223 4.53 0.0008
2023-02-14 2022-12-31 13F ZSCALER COM 98980G102 10,451 -34 -0.32 1,170 -32.19 0.0008
2023-01-13 2022-09-30 13F/A-1 ZSCALER COM 98980G102 10,485 -269 -2.50 1,724 7.21 0.0013
2022-11-14 2022-09-30 13F ZSCALER COM 98980G102 10,485 -269 1,724 0.0013
2022-08-15 2022-06-30 13F ZSCALER COM 98980G102 10,754 -104,356 -90.66 1,608 -94.21 0.0011
2022-05-16 2022-03-31 13F ZSCALER COM 98980G102 115,110 -51,597 -30.95 27,775 -48.15 0.0134
2022-02-14 2021-12-31 13F ZSCALER COM 98980G102 166,707 125,088 300.56 53,568 390.91 0.0223
2021-11-16 2021-09-30 13F ZSCALER COM 98980G102 41,619 -28,531 -40.67 10,912 -28.01 0.0048
2021-08-16 2021-06-30 13F ZSCALER COM 98980G102 70,150 48,952 230.93 15,158 316.54 0.0065
2021-05-17 2021-03-31 13F ZSCALER COM 98980G102 21,198 -48,656 -69.65 3,639 -73.92 0.0017
2021-02-16 2020-12-31 13F ZSCALER COM 98980G102 69,854 -11,567 -14.21 13,951 21.79 0.0065
2020-11-16 2020-09-30 13F ZSCALER COM 98980G102 81,421 63,702 359.51 11,455 490.46 0.0060
2020-08-14 2020-06-30 13F ZSCALER COM 98980G102 17,719 17,719 1,940 0.0011
2020-05-14 2020-03-31 13F ZSCALER COM 98980G102 0 -134,511 -100.00 0 -100.00
2020-02-18 2019-12-31 13F ZSCALER COM 98980G102 134,511 -9,631 -6.68 6,255 -8.18 0.0032
2019-11-14 2019-09-30 13F ZSCALER COM 98980G102 144,142 144,142 6,812 0.0037
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.