Qualys, Inc.
US ˙ NasdaqGS ˙ US74758T3032

SecurityQLYS / Qualys, Inc.
InstitutionTrexquant Investment LP
Latest Disclosed Ownership156,021 shares
Latest Disclosed Value $ 13,706,445
Trexquant Investment LP reports 115.19% increase in ownership of QLYS / Qualys, Inc.

On May 15, 2026 - Trexquant Investment LP filed a 13F-HR form disclosing ownership of 156,021 shares of Qualys, Inc. (US:QLYS) valued at $13,706,445 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 72,505 shares of Qualys, Inc.. This represents a change in shares of 115.19% during the quarter. The current value of the position is $17,146,708 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)
2026-05-15 2026-03-31 13F QUALYS COM 74758T303 156,021 83,516 115.19 13,706 42.25 0.0985
2026-02-17 2025-12-31 13F QUALYS COM 74758T303 72,505 19,262 36.18 9,636 36.76 0.0859
2025-11-14 2025-09-30 13F QUALYS COM 74758T303 53,243 -42,511 -44.40 7,046 -48.50 0.0725
2025-08-12 2025-06-30 13F QUALYS COM 74758T303 95,754 4,563 5.00 13,680 19.13 0.1543
2025-05-14 2025-03-31 13F QUALYS COM 74758T303 91,191 39,214 75.44 11,484 57.56 0.1336
2025-02-12 2024-12-31 13F QUALYS COM 74758T303 51,977 -39,480 -43.17 7,288 -37.96 0.0850
2024-11-12 2024-09-30 13F QUALYS COM 74758T303 91,457 -31,387 -25.55 11,749 -32.93 0.1487
2024-08-13 2024-06-30 13F QUALYS COM 74758T303 122,844 55,021 81.12 17,518 54.78 0.2672
2024-05-14 2024-03-31 13F QUALYS COM 74758T303 67,823 36,677 117.76 11,318 85.13 0.2256
2024-02-09 2023-12-31 13F QUALYS COM 74758T303 31,146 1,636 5.54 6,113 35.81 0.1376
2023-11-13 2023-09-30 13F QUALYS COM 74758T303 29,510 15,452 109.92 4,502 147.99 0.1129
2023-08-11 2023-06-30 13F QUALYS COM 74758T303 14,058 586 4.35 1,816 3.66 0.0476
2023-05-15 2023-03-31 13F QUALYS COM 74758T303 13,472 -4,913 -26.72 1,752 -15.12 0.0481
2023-02-13 2022-12-31 13F QUALYS COM 74758T303 18,385 10,079 121.35 2,063 78.15 0.0585
2022-11-14 2022-09-30 13F QUALYS COM 74758T303 8,306 351 4.41 1,158 15.45 0.0407
2022-08-11 2022-06-30 13F QUALYS COM 74758T303 7,955 -2,590 -24.56 1,003 -33.22 0.0449
2022-05-13 2022-03-31 13F QUALYS COM 74758T303 10,545 -6,300 -37.40 1,502 -35.01 0.0705
2022-02-14 2021-12-31 13F QUALYS COM 74758T303 16,845 11,216 199.25 2,311 269.17 0.1428
2021-11-12 2021-09-30 13F QUALYS COM 74758T303 5,629 5,629 626 0.0497
2021-02-11 2020-12-31 13F QUALYS COM 74758T303 0 -4,707 -100.00 0 -100.00
2020-11-06 2020-09-30 13F QUALYS COM 74758T303 4,707 285 6.45 461 0.22 0.0297
2020-08-07 2020-06-30 13F QUALYS COM 74758T303 4,422 -22,765 -83.73 460 -80.55 0.0319
2020-05-08 2020-03-31 13F QUALYS COM 74758T303 27,187 14,141 108.39 2,365 117.37 0.1716
2020-02-12 2019-12-31 13F QUALYS COM 74758T303 13,046 3,445 35.88 1,088 49.86 0.0644
2020-02-18 2019-09-30 13F/A-1 QUALYS COM 74758T303 9,601 9,601 726 0.0627
2019-11-08 2019-09-30 13F QUALYS COM 74758T303 9,601 9,601 726 62,702.7475
2019-08-09 2019-06-30 13F QUALYS COM 74758T303 0 -20,832 -100.00 0 -100.00
2019-05-13 2019-03-31 13F QUALYS COM 74758T303 20,832 20,832 1,724 0.1224
2019-02-13 2018-12-31 13F QUALYS COM 74758T303 0 -7,679 -100.00 0 -100.00
2018-11-09 2018-09-30 13F QUALYS COM 74758T303 7,679 7,679 684 0.0514
2018-08-07 2018-06-30 13F QUALYS COM 74758T303 0 -3,594 -100.00 0 -100.00
2018-05-03 2018-03-31 13F QUALYS COM 74758T303 3,594 3,594 261 0.0182
2016-11-10 2016-09-30 13F QUALYS COM 74758T303 0 -15,800 -100.00 0 -100.00
2016-08-10 2016-06-30 13F QUALYS COM 74758T303 15,800 15,800 0.00 471 0.0619
2016-05-11 2016-03-31 13F QUALYS COM 74758T303 0 -49,011 -100.00 0 -100.00
2016-02-10 2015-12-31 13F QUALYS COM 74758T303 49,011 49,011 1,622 0.1429
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.