QUALYS INC (QLYS) Institutional Shareholders
QUALYS INC (QLYS) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $3.15B in QLYS holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of QLYS tracked by InsiderSet, reporting ownership valued at approximately $470.93M in its March 31, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $775.95M, representing an estimated gain of +64.77% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 49% of the total disclosed QLYS value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Vanguard Portfolio Management Llc, Vanguard Capital Management Llc, and several other long-term asset managers with concentrated positions in QUALYS INC (QLYS).
This page ranks the largest institutional QLYS shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
420
Total Reported Value
$3.15B
Largest Holder
Blackrock, Inc.
Largest Position
$470.93M
Insider Transactions (90d)
47
Latest Filing Quarter
Q2 2026
New Institutional Positions
63
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.01% | 5,360,596 | $470,928,356 | $775,946,271 | +$305,017,915 | +64.77% | |
| Vanguard Portfolio Management Llc | 0.01% | 2,537,126 | $222,886,519 | $367,248,989 | +$144,362,470 | +64.77% | |
| Vanguard Capital Management Llc | 0.00% | 1,584,606 | $139,207,637 | $229,371,719 | +$90,164,082 | +64.77% | |
| Boston Trust Walden Corp | 1.03% | 984,889 | $135,412,389 | $142,562,683 | +$7,150,294 | +5.28% | |
| State Street Corp | 0.00% | 1,388,720 | $121,999,052 | $201,017,220 | +$79,018,168 | +64.77% | |
| Geode Capital Management, Llc | 0.01% | 1,320,909 | $116,055,920 | $191,201,578 | +$75,145,658 | +64.75% | |
| Aqr Capital Management Llc | 0.04% | 1,038,928 | $90,843,907 | $150,384,828 | +$59,540,921 | +65.54% | |
| Legal & General Group Plc | 0.02% | 1,029,587 | $90,449,218 | $149,032,718 | +$58,583,500 | +64.77% | |
| First Trust Advisors Lp | 0.06% | 996,064 | $87,504,222 | $144,180,264 | +$56,676,042 | +64.77% | |
| Arrowstreet Capital, Limited Partnership | 0.04% | 832,796 | $73,161,129 | $120,547,221 | +$47,386,092 | +64.77% | |
| Dimensional Fund Advisors Lp | 0.01% | 763,099 | $67,040,637 | $110,458,580 | +$43,417,943 | +64.76% | |
| Morgan Stanley | 0.00% | 646,426 | $56,788,676 | $93,570,164 | +$36,781,488 | +64.77% | |
| Fort Washington Investment Advisors Inc | 0.25% | 368,865 | $50,715,249 | $53,393,209 | +$2,677,960 | +5.28% | |
| Rwa Wealth Partners, Llc | 0.53% | 548,760 | $48,208,566 | $79,433,010 | +$31,224,444 | +64.77% | |
| Northern Trust Corp | 0.01% | 510,546 | $44,851,467 | $73,901,534 | +$29,050,067 | +64.77% | |
| Charles Schwab Investment Management Inc | 0.01% | 502,419 | $44,137,509 | $72,725,150 | +$28,587,641 | +64.77% | |
| Renaissance Technologies LLC | Jim Simons | 0.07% | 497,600 | $43,714,160 | $72,027,600 | +$28,313,440 | +64.77% |
| Neuberger Berman Group Llc | 0.03% | 470,116 | $41,299,690 | $68,049,291 | +$26,749,601 | +64.77% | |
| Cdam (Uk) Ltd | 9.14% | 469,001 | $41,201,738 | $67,887,895 | +$26,686,157 | +64.77% | |
| London Co Of Virginia | 0.25% | 466,342 | $40,969,044 | $67,503,005 | +$26,533,961 | +64.77% | |
| Mirae Asset Global Etfs Holdings Ltd. | 0.05% | 438,572 | $38,528,791 | $63,483,297 | +$24,954,506 | +64.77% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.01% | 416,587 | $36,597,169 | $60,300,968 | +$23,703,799 | +64.77% | |
| Invesco Ltd. | 0.01% | 380,820 | $33,455,037 | $55,123,695 | +$21,668,658 | +64.77% | |
| Clark Capital Management Group, Inc. | 0.21% | 380,459 | $33,423,323 | $55,071,440 | +$21,648,117 | +64.77% | |
| Envestnet Asset Management Inc | 0.01% | 213,213 | $29,314,590 | $30,862,582 | +$1,547,992 | +5.28% | |
| Goldman Sachs Group Inc | 0.00% | 324,180 | $28,479,213 | $46,925,055 | +$18,445,842 | +64.77% | |
| Bank Of New York Mellon Corp | 0.01% | 318,287 | $27,961,551 | $46,072,043 | +$18,110,492 | +64.77% | |
| Alyeska Investment Group, L.P. | 0.08% | 304,677 | $26,765,874 | $44,101,996 | +$17,336,122 | +64.77% | |
| Voya Investment Management Llc | 0.03% | 297,355 | $26,122,637 | $43,042,136 | +$16,919,499 | +64.77% | |
| Retirement Systems Of Alabama | 0.07% | 174,089 | $23,935,497 | $25,199,383 | +$1,263,886 | +5.28% | |
| Tudor Investment Corp Et Al | 0.12% | 250,885 | $22,040,247 | $36,315,604 | +$14,275,357 | +64.77% | |
| Vanguard Fiduciary Trust Co | 0.01% | 250,359 | $21,994,038 | $36,239,465 | +$14,245,427 | +64.77% | |
| Portolan Capital Management, Llc | 1.12% | 239,028 | $20,998,610 | $34,599,303 | +$13,600,693 | +64.77% | |
| Millennium Management Llc | 0.02% | 235,382 | $20,678,309 | $34,071,545 | +$13,393,236 | +64.77% | |
| Fundsmith | Terry Smith | 0.15% | 226,077 | $19,860,864 | $32,724,646 | +$12,863,782 | +64.77% |
| Bnp Paribas Financial Markets | 0.01% | 208,624 | $18,327,618 | $30,198,324 | +$11,870,706 | +64.77% | |
| Bank Of America Corp | 0.00% | 203,697 | $17,894,781 | $29,485,141 | +$11,590,360 | +64.77% | |
| Citadel Advisors Llc | 0.01% | 203,530 | $17,880,110 | $29,460,968 | +$11,580,858 | +64.77% | |
| Ubs Group Ag | 0.00% | 194,217 | $17,061,963 | $28,112,911 | +$11,050,948 | +64.77% | |
| Ameriprise Financial Inc | 0.00% | 183,972 | $16,160,334 | $26,629,947 | +$10,469,613 | +64.79% | |
| Federated Hermes, Inc. | 0.03% | 180,260 | $15,835,841 | $26,092,635 | +$10,256,794 | +64.77% | |
| Tributary Capital Management, Llc | 1.27% | 112,278 | $15,437,102 | $16,252,241 | +$815,139 | +5.28% | |
| Vontobel Holding Ltd. | 0.05% | 107,542 | $14,785,950 | $15,566,705 | +$780,755 | +5.28% | |
| Nordea Investment Management Ab | 0.01% | 168,031 | $14,465,789 | $24,322,487 | +$9,856,698 | +68.14% | |
| Cullinan Associates Inc | 1.07% | 102,800 | $14,133,972 | $14,880,300 | +$746,328 | +5.28% | |
| Trexquant Investment Lp | 0.10% | 156,021 | $13,706,445 | $22,584,040 | +$8,877,595 | +64.77% | |
| Two Sigma Investments, Lp | 0.01% | 155,036 | $13,619,913 | $22,441,461 | +$8,821,548 | +64.77% | |
| Alliancebernstein L.P. | 0.00% | 96,529 | $12,828,704 | $13,972,573 | +$1,143,869 | +8.92% | |
| Marshall Wace, Llp | 0.01% | 143,501 | $12,606,561 | $20,771,770 | +$8,165,209 | +64.77% | |
| Principal Financial Group Inc | 0.01% | 140,317 | $12,326,848 | $20,310,886 | +$7,984,038 | +64.77% |
Frequently asked questions about QLYS
Who owns the most QLYS stock?
The largest holders of QLYS are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for QUALYS INC (QLYS).
Is QLYS widely held by superinvestors?
Many widely followed stocks like QLYS appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly QLYS is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.