Qualys, Inc.
MX ˙ BMV ˙ US74758T3032
SecurityMX:QLYS / Qualys, Inc.
InstitutionRenaissance Technologies Llc
ManagerJames Simons
Latest Disclosed Ownership497,600 shares
Latest Disclosed Value $ 43,714,160
Renaissance Technologies Llc reports 3.60% increase in ownership of QLYS / Qualys, Inc.

On May 14, 2026 - Renaissance Technologies Llc filed a 13F-HR form disclosing ownership of 497,600 shares of Qualys, Inc. (MX:QLYS) valued at $43,714,160 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 480,300 shares of Qualys, Inc.. This represents a change in shares of 3.60% 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)
2026-05-14 2026-03-31 13F QUALYS COM 74758T303 497,600 17,300 3.60 43,714 -31.52 0.0684
2026-02-12 2025-12-31 13F QUALYS COM 74758T303 480,300 24,600 5.40 63,832 5.85 0.0990
2025-11-13 2025-09-30 13F QUALYS COM 74758T303 455,700 95,300 26.44 60,303 17.11 0.0796
2025-08-13 2025-06-30 13F QUALYS COM 74758T303 360,400 -21,900 -5.73 51,490 6.95 0.0685
2025-05-14 2025-03-31 13F QUALYS COM 74758T303 382,300 6,200 1.65 48,143 -8.71 0.0729
2025-02-13 2024-12-31 13F QUALYS COM 74758T303 376,100 -33,700 -8.22 52,737 0.18 0.0781
2024-11-13 2024-09-30 13F QUALYS COM 74758T303 409,800 -64,300 -13.56 52,643 -22.13 0.0792
2024-08-09 2024-06-30 13F QUALYS COM 74758T303 474,100 63,000 15.32 67,607 99,320.59 0.1147
2024-05-13 2024-03-31 13F QUALYS COM 74758T303 411,100 253,500 160.85 69 126.67 0.1078
2024-02-13 2023-12-31 13F QUALYS COM 74758T303 157,600 34,300 27.82 31 66.67 0.0479
2023-11-14 2023-09-30 13F QUALYS COM 74758T303 123,300 -14,300 -10.39 19 5.88 0.0321
2023-08-11 2023-06-30 13F QUALYS COM 74758T303 137,600 -31,600 -18.68 18 -19.05 0.0256
2023-05-12 2023-03-31 13F QUALYS COM 74758T303 169,200 -142,500 -45.72 22 -38.24 0.0292
2023-02-13 2022-12-31 13F QUALYS COM 74758T303 311,700 79,000 33.95 35 -99.90 0.0479
2022-11-14 2022-09-30 13F QUALYS COM 74758T303 232,700 46,800 25.17 32,436 38.33 0.0459
2022-08-12 2022-06-30 13F QUALYS COM 74758T303 185,900 141,300 316.82 23,449 269.22 0.0278
2022-05-13 2022-03-31 13F QUALYS COM 74758T303 44,600 31,000 227.94 6,351 240.35 0.0075
2022-02-11 2021-12-31 13F QUALYS COM 74758T303 13,600 -66,100 -82.94 1,866 -78.96 0.0023
2021-11-12 2021-09-30 13F QUALYS COM 74758T303 79,700 79,700 8,870 0.0115
2021-05-13 2021-03-31 13F QUALYS COM 74758T303 0 -101,900 -100.00 0 -100.00
2021-02-10 2020-12-31 13F QUALYS COM 74758T303 101,900 -229,300 -69.23 12,419 -61.74 0.0135
2020-11-13 2020-09-30 13F QUALYS COM 74758T303 331,200 -180,200 -35.24 32,461 -38.98 0.0324
2020-08-13 2020-06-30 13F QUALYS COM 74758T303 511,400 298,300 139.98 53,196 186.96 0.0459
2020-05-14 2020-03-31 13F QUALYS COM 74758T303 213,100 -196,300 -47.95 18,538 -45.69 0.0180
2020-02-13 2019-12-31 13F QUALYS COM 74758T303 409,400 -43,500 -9.60 34,132 -0.27 0.0262
2019-11-13 2019-09-30 13F QUALYS COM 74758T303 452,900 54,000 13.54 34,226 -1.47 0.0290
2019-08-12 2019-06-30 13F QUALYS COM 74758T303 398,900 -230,000 -36.57 34,736 -33.24 0.0306
2019-05-14 2019-03-31 13F QUALYS COM 74758T303 628,900 -250,100 -28.45 52,035 -20.79 0.0473
2019-02-12 2018-12-31 13F QUALYS COM 74758T303 879,000 -179,600 -16.97 65,696 -30.35 0.0719
2018-11-13 2018-09-30 13F QUALYS COM 74758T303 1,058,600 -247,600 -18.96 94,321 -14.34 0.0970
2018-08-13 2018-06-30 13F/A-1 QUALYS COM 74758T303 1,306,200 -182,000 -12.23 110,113 1.71 0.1200
2018-08-13 2018-06-30 13F QUALYS COM 74758T303 1,488,200 108,267
2018-05-14 2018-03-31 13F QUALYS COM 74758T303 1,488,200 187,500 14.42 108,267 40.25 0.1184
2018-02-13 2017-12-31 13F QUALYS COM 74758T303 1,300,700 185,200 16.60 77,197 33.60 0.0851
2017-11-13 2017-09-30 13F QUALYS COM 74758T303 1,115,500 92,500 9.04 57,783 38.44 0.0680
2017-08-11 2017-06-30 13F QUALYS COM 74758T303 1,023,000 105,100 11.45 41,738 19.98 0.0533
2017-05-12 2017-03-31 13F QUALYS COM 74758T303 917,900 186,000 25.41 34,788 50.17 0.0486
2017-02-13 2016-12-31 13F QUALYS COM 74758T303 731,900 116,100 18.85 23,165 -1.50 0.0366
2016-11-14 2016-09-30 13F QUALYS COM 74758T303 615,800 93,400 17.88 23,517 51.01 0.0416
2016-08-12 2016-06-30 13F QUALYS COM 74758T303 522,400 100,000 23.67 15,573 45.66 0.0296
2016-05-13 2016-03-31 13F QUALYS COM 74758T303 422,400 321,400 318.22 10,691 219.90 0.0203
2016-02-11 2015-12-31 13F QUALYS COM 74758T303 101,000 101,000 -76.09 3,342 -68.74 0.0073
2015-08-14 2015-06-30 13F QUALYS COM 74758T303 0 -10,900 -100.00 0 -100.00
2015-05-13 2015-03-31 13F QUALYS COM 74758T303 10,900 10,900 507 0.0011
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.