Zscaler, Inc.
US ˙ NasdaqGS ˙ US98980G1022

SecurityZS / Zscaler, Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership532,306 shares
Latest Disclosed Value $ 74,677,209
Citigroup Inc ownership in ZS / Zscaler, Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 532,306 shares of Zscaler, Inc. (US:ZS) valued at $74,677,209 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 483,905 shares of Zscaler, Inc.. This represents a change in shares of 10.00% during the quarter. The current value of the position is $71,525,957 USD.

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

ZS / Zscaler, 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 ZSCALER COM 98980G102 532,306 48,401 10.00 74,677 -31.39 0.0160
2026-02-13 2025-12-31 13F ZSCALER COM 98980G102 483,905 29,951 6.60 108,840 -19.99 0.0480
2025-11-10 2025-09-30 13F ZSCALER COM 98980G102 453,954 235,459 107.76 136,032 98.31 0.0606
2025-08-11 2025-06-30 13F ZSCALER COM 98980G102 218,495 -346,785 -61.35 68,594 -38.84 0.0337
2025-05-12 2025-03-31 13F ZSCALER COM 98980G102 565,280 357,090 171.52 112,163 198.63 0.0573
2025-02-12 2024-12-31 13F ZSCALER COM 98980G102 208,190 -10,616 -4.85 37,560 0.42 0.0223
2024-11-12 2024-09-30 13F ZSCALER COM 98980G102 218,806 9,207 4.39 37,403 -7.15 0.0217
2024-08-12 2024-06-30 13F ZSCALER COM 98980G102 209,599 63,560 43.52 40,283 43.19 0.0258
2024-05-10 2024-03-31 13F ZSCALER COM 98980G102 146,039 -49,866 -25.45 28,131 -35.19 0.0185
2024-02-09 2023-12-31 13F ZSCALER COM 98980G102 195,905 89,654 84.38 43,405 162.56 0.0306
2023-12-06 2023-09-30 13F/A-1 ZSCALER COM 98980G102 106,251 -2,664 -2.45 16,532 3.75 0.0124
2023-11-09 2023-09-30 13F ZSCALER COM 98980G102 106,251 -2,664 16,532 0.0123
2023-08-10 2023-06-30 13F ZSCALER COM 98980G102 108,915 9,325 9.36 15,934 36.95 0.0104
2023-05-11 2023-03-31 13F ZSCALER COM 98980G102 99,590 -1,925 -1.90 11,635 2.43 0.0082
2023-02-09 2022-12-31 13F ZSCALER COM 98980G102 101,515 15,721 18.32 11,360 -19.45 0.0090
2022-11-10 2022-09-30 13F ZSCALER COM 98980G102 85,794 -18,823 -17.99 14,102 -9.84 0.0101
2022-08-10 2022-06-30 13F ZSCALER COM 98980G102 104,617 -58,984 -36.05 15,641 -60.38 0.0116
2022-05-12 2022-03-31 13F ZSCALER COM 98980G102 163,601 -14,356 -8.07 39,474 -30.97 0.0240
2022-02-10 2021-12-31 13F ZSCALER COM 98980G102 177,957 50,963 40.13 57,184 71.72 0.0306
2021-11-10 2021-09-30 13F ZSCALER COM 98980G102 126,994 26,431 26.28 33,301 53.26 0.0197
2021-08-10 2021-06-30 13F ZSCALER COM 98980G102 100,563 -16,321 -13.96 21,728 8.29 0.0131
2021-05-13 2021-03-31 13F ZSCALER COM 98980G102 116,884 -16,111 -12.11 20,065 -24.46 0.0130
2021-02-11 2020-12-31 13F ZSCALER COM 98980G102 132,995 37,301 38.98 26,561 97.29 0.0157
2020-11-12 2020-09-30 13F ZSCALER COM 98980G102 95,694 -4,557 -4.55 13,463 22.64 0.0088
2020-08-12 2020-06-30 13F ZSCALER COM 98980G102 100,251 60,226 150.47 10,978 350.84 0.0086
2020-05-12 2020-03-31 13F ZSCALER COM 98980G102 40,025 -16,947 -29.75 2,435 -8.08 0.0022
2020-02-12 2019-12-31 13F ZSCALER COM 98980G102 56,972 -9,813 -14.69 2,649 -16.06 0.0019
2019-11-08 2019-09-30 13F ZSCALER COM 98980G102 66,785 -21,468 -24.33 3,156 -53.34 0.0025
2019-08-12 2019-06-30 13F ZSCALER COM 98980G102 88,253 57,453 186.54 6,764 209.57 0.0055
2019-05-13 2019-03-31 13F ZSCALER COM 98980G102 30,800 10,742 53.55 2,185 177.64 0.0021
2019-02-12 2018-12-31 13F ZSCALER COM 98980G102 20,058 13,564 208.87 787 196.98 0.0008
2018-11-13 2018-09-30 13F ZSCALER COM 98980G102 6,494 3,763 137.79 265 170.41 0.0002
2018-08-10 2018-06-30 13F ZSCALER COM 98980G102 2,731 2,731 98 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 ZSCALER COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2026-02-13 2025-12-31 13F ZSCALER COM Call 10,000 0.00 2,249 -24.93 n/a n/a n/a
2025-11-10 2025-09-30 13F ZSCALER COM Call 10,000 0.00 2,997 -4.56 n/a n/a n/a
2025-08-11 2025-06-30 13F ZSCALER COM Call 10,000 -79.47 3,139 -67.52 n/a n/a n/a
2025-05-12 2025-03-31 13F ZSCALER COM Call 48,700 -1.62 9,663 8.21 n/a n/a n/a
2025-02-12 2024-12-31 13F ZSCALER COM Call 49,500 25.32 8,930 32.26 n/a n/a n/a
2024-11-12 2024-09-30 13F ZSCALER COM Call 39,500 61.22 6,752 43.42 n/a n/a n/a
2024-08-12 2024-06-30 13F ZSCALER COM Call 24,500 -79.50 4,709 -79.55 n/a n/a n/a
2024-05-10 2024-03-31 13F ZSCALER COM Call 119,500 19.50 23,019 3.90 n/a n/a n/a
2024-02-09 2023-12-31 13F ZSCALER COM Call 100,000 22,156 n/a n/a n/a
2022-05-12 2022-03-31 13F ZSCALER COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2022-02-10 2021-12-31 13F ZSCALER COM Call 23,300 7,487 n/a n/a n/a
2021-05-13 2021-03-31 13F ZSCALER COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2021-02-11 2020-12-31 13F ZSCALER COM Call 73,900 13.00 14,759 60.41 n/a n/a n/a
2020-11-12 2020-09-30 13F ZSCALER COM Call 65,400 -19.46 9,201 3.49 n/a n/a n/a
2020-08-12 2020-06-30 13F ZSCALER COM Call 81,200 -12.97 8,891 56.59 n/a n/a n/a
2020-05-12 2020-03-31 13F ZSCALER COM Call 93,300 -55.59 5,678 -41.88 n/a n/a n/a
2020-02-12 2019-12-31 13F ZSCALER COM Call 210,100 1,060.77 9,770 1,042.69 n/a n/a n/a
2019-11-08 2019-09-30 13F ZSCALER COM Call 18,100 -64.65 855 -78.21 n/a n/a n/a
2019-08-12 2019-06-30 13F ZSCALER COM Call 51,200 -23.35 3,924 -17.18 n/a n/a n/a
2019-05-13 2019-03-31 13F ZSCALER COM Call 66,800 1,657.89 4,738 3,079.87 n/a n/a n/a
2019-02-12 2018-12-31 13F ZSCALER COM Call 3,800 149 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 ZSCALER COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2026-02-13 2025-12-31 13F ZSCALER COM Put 59,200 3.68 13,315 -22.18 n/a n/a n/a
2025-11-10 2025-09-30 13F ZSCALER COM Put 57,100 17.25 17,111 11.92 n/a n/a n/a
2025-08-11 2025-06-30 13F ZSCALER COM Put 48,700 25.84 15,289 99.11 n/a n/a n/a
2025-05-12 2025-03-31 13F ZSCALER COM Put 38,700 287.00 7,679 325.61 n/a n/a n/a
2025-02-12 2024-12-31 13F ZSCALER COM Put 10,000 -86.67 1,804 -85.93 n/a n/a n/a
2024-11-12 2024-09-30 13F ZSCALER COM Put 75,000 7.14 12,820 -4.71 n/a n/a n/a
2024-08-12 2024-06-30 13F ZSCALER COM Put 70,000 40.00 13,453 39.68 n/a n/a n/a
2024-05-10 2024-03-31 13F ZSCALER COM Put 50,000 0.00 9,632 -13.06 n/a n/a n/a
2024-02-09 2023-12-31 13F ZSCALER COM Put 50,000 11,078 n/a n/a n/a
2022-11-10 2022-09-30 13F ZSCALER COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2022-08-10 2022-06-30 13F ZSCALER COM Put 86,000 12,858 n/a n/a n/a
2022-05-12 2022-03-31 13F ZSCALER COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2022-02-10 2021-12-31 13F ZSCALER COM Put 35,300 194.17 11,343 260.44 n/a n/a n/a
2021-11-10 2021-09-30 13F ZSCALER COM Put 12,000 -16.67 3,147 1.12 n/a n/a n/a
2021-08-10 2021-06-30 13F ZSCALER COM Put 14,400 0.00 3,112 25.89 n/a n/a n/a
2021-05-13 2021-03-31 13F ZSCALER COM Put 14,400 -72.25 2,472 -76.15 n/a n/a n/a
2021-02-11 2020-12-31 13F ZSCALER COM Put 51,900 15.59 10,365 64.08 n/a n/a n/a
2020-11-12 2020-09-30 13F ZSCALER COM Put 44,900 -20.39 6,317 2.28 n/a n/a n/a
2020-08-12 2020-06-30 13F ZSCALER COM Put 56,400 -26.66 6,176 31.97 n/a n/a n/a
2020-05-12 2020-03-31 13F ZSCALER COM Put 76,900 -39.50 4,680 -20.83 n/a n/a n/a
2020-02-12 2019-12-31 13F ZSCALER COM Put 127,100 319.47 5,911 312.78 n/a n/a n/a
2019-11-08 2019-09-30 13F ZSCALER COM Put 30,300 146.34 1,432 51.86 n/a n/a n/a
2019-08-12 2019-06-30 13F ZSCALER COM Put 12,300 -76.75 943 -74.87 n/a n/a n/a
2019-05-13 2019-03-31 13F ZSCALER COM Put 52,900 587.01 3,752 1,142.38 n/a n/a n/a
2019-02-12 2018-12-31 13F ZSCALER COM Put 7,700 450.00 302 429.82 n/a n/a n/a
2018-11-13 2018-09-30 13F ZSCALER COM Put 1,400 57 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.