Qualys, Inc.
US ˙ NasdaqGS ˙ US74758T3032

SecurityQLYS / Qualys, Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership763,099 shares
Latest Disclosed Value $ 67,040,637
Dimensional Fund Advisors Lp reports 6.37% increase in ownership of QLYS / Qualys, Inc.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 763,099 shares of Qualys, Inc. (US:QLYS) valued at $67,038,247 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 717,381 shares of Qualys, Inc.. This represents a change in shares of 6.37% during the quarter. The current value of the position is $83,864,580 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)
2026-05-07 2026-03-31 13F QUALYS COM 74758T303 763,099 45,718 6.37 67,041 -29.69 0.0030
2026-02-12 2025-12-31 13F QUALYS COM 74758T303 717,381 21,649 3.11 95,344 3.55 0.0200
2025-11-12 2025-09-30 13F QUALYS COM 74758T303 695,732 14,380 2.11 92,077 -5.41 0.0198
2025-08-12 2025-06-30 13F QUALYS COM 74758T303 681,352 12,037 1.80 97,342 15.49 0.0225
2025-05-13 2025-03-31 13F QUALYS COM 74758T303 669,315 5,310 0.80 84,288 -9.47 0.0210
2025-02-13 2024-12-31 13F QUALYS COM 74758T303 664,005 -15,307 -2.25 93,106 6.69 0.0224
2024-11-07 2024-09-30 13F QUALYS COM 74758T303 679,312 -31,907 -4.49 87,268 -13.95 0.0212
2024-08-09 2024-06-30 13F QUALYS COM 74758T303 711,219 -32,625 -4.39 101,421 -18.29 0.0265
2024-05-10 2024-03-31 13F QUALYS COM 74758T303 743,844 4,639 0.63 124,125 -14.45 0.0336
2024-02-07 2023-12-31 13F QUALYS COM 74758T303 739,205 21,439 2.99 145,095 32.51 0.0424
2023-11-09 2023-09-30 13F QUALYS COM 74758T303 717,766 20,517 2.94 109,497 21.58 0.0359
2023-08-09 2023-06-30 13F QUALYS COM 74758T303 697,249 145 0.02 90,064 -0.63 0.0287
2023-05-12 2023-03-31 13F QUALYS COM 74758T303 697,104 -2,292 -0.33 90,633 116,094.87 0.0305
2023-02-09 2022-12-31 13F QUALYS COM 74758T303 699,396 8,032 1.16 78 -99.92 0.0232
2022-11-10 2022-09-30 13F QUALYS COM 74758T303 691,364 24,351 3.65 96,373 14.54 0.0370
2022-08-12 2022-06-30 13F QUALYS COM 74758T303 667,013 11,425 1.74 84,138 -9.88 0.0302
2022-05-13 2022-03-31 13F QUALYS COM 74758T303 655,588 -7,196 -1.09 93,364 2.65 0.0288
2022-02-09 2021-12-31 13F QUALYS COM 74758T303 662,784 -29,272 -4.23 90,951 18.09 0.0275
2021-11-12 2021-09-30 13F QUALYS COM 74758T303 692,056 -16,843 -2.38 77,019 7.90 0.0248
2021-08-12 2021-06-30 13F QUALYS COM 74758T303 708,899 1,355 0.19 71,381 -3.70 0.0226
2021-05-14 2021-03-31 13F QUALYS COM 74758T303 707,544 -16,204 -2.24 74,121 -15.96 0.0245
2021-03-08 2020-12-31 13F/A-2 QUALYS COM 74758T303 723,748 -24,037 -3.21 88,201 20.34 0.0318
2021-02-11 2020-12-31 13F QUALYS COM 74758T303 723,748 -24,037 88,201 31,853.5131
2020-11-12 2020-09-30 13F QUALYS COM 74758T303 747,785 11,670 1.59 73,292 -4.28 0.0311
2020-08-13 2020-06-30 13F QUALYS COM 74758T303 736,115 14,999 2.08 76,566 22.06 0.0337
2020-05-14 2020-03-31 13F QUALYS COM 74758T303 721,116 17,650 2.51 62,730 6.96 0.0327
2020-02-14 2019-12-31 13F QUALYS COM 74758T303 703,466 5,162 0.74 58,648 11.14 0.0214
2019-11-12 2019-09-30 13F QUALYS COM 74758T303 698,304 6,198 0.90 52,770 -12.44 0.0205
2019-08-13 2019-06-30 13F QUALYS COM 74758T303 692,106 21,253 3.17 60,267 8.58 0.0234
2019-08-12 2019-03-31 13F/A-2 QUALYS COM 74758T303 670,853 28,807 4.49 55,506 15.67 0.0221
2019-05-10 2019-03-31 13F QUALYS COM 74758T303 670,853 28,807 55,506
2019-02-26 2018-12-31 13F/A-1 QUALYS COM 74758T303 642,046 62,413 10.77 47,987 -7.08 0.0217
2019-02-13 2018-12-31 13F QUALYS COM 74758T303 642,046 62,413 47,987
2018-11-13 2018-09-30 13F QUALYS COM 74758T303 579,633 44,456 8.31 51,645 14.47 0.0197
2018-08-10 2018-06-30 13F QUALYS COM 74758T303 535,177 -26,471 -4.71 45,116 10.42 0.0180
2018-05-11 2018-03-31 13F QUALYS COM 74758T303 561,648 -8,542 -1.50 40,860 20.74 0.0170
2018-02-12 2017-12-31 13F QUALYS COM 74758T303 570,190 -4,782 -0.83 33,841 13.62 0.0140
2017-11-13 2017-09-30 13F QUALYS COM 74758T303 574,972 -62,510 -9.81 29,784 14.51 0.0130
2017-08-11 2017-06-30 13F QUALYS COM 74758T303 637,482 43,462 7.32 26,009 15.53 0.0120
2017-05-12 2017-03-31 13F QUALYS COM 74758T303 594,020 31,555 5.61 22,513 26.46 0.0108
2017-02-09 2016-12-31 13F QUALYS COM 74758T303 562,465 45,286 8.76 17,802 -9.87 0.0089
2016-11-10 2016-09-30 13F QUALYS COM 74758T303 517,179 149,429 40.63 19,751 80.16 0.0107
2016-08-09 2016-06-30 13F QUALYS COM 74758T303 367,750 37,094 11.22 10,963 31.00 0.0063
2016-05-13 2016-03-31 13F QUALYS COM 74758T303 330,656 259,482 364.57 8,369 255.37 0.0050
2016-02-10 2015-12-31 13F QUALYS COM 74758T303 71,174 71,174 2,355 0.0015
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.