Insider Trading
Current insider transactions (SEC Form 4) — buys and sells by officers, directors, and major shareholders.
| Ticker | Insider | Title | Date | Transaction | Price ($) | Shares | Value ($) | SEC Form 4 |
|---|---|---|---|---|---|---|---|---|
| QLYS | Posey Bruce K | CHIEF LEGAL OFFICER | 10/20/2026 | Verkauf | 191.26 | 62 | 11,858 | Form 4 |
| QLYS | Posey Bruce K | CHIEF LEGAL OFFICER | 10/20/2026 | Verkauf | 190.49 | 449 | 85,529 | Form 4 |
| QLYS | Posey Bruce K | CHIEF LEGAL OFFICER | 10/20/2026 | Verkauf | 189.52 | 244 | 46,242 | Form 4 |
| QLYS | Posey Bruce K | CHIEF LEGAL OFFICER | 10/20/2026 | Verkauf | 187.25 | 35 | 6,554 | Form 4 |
| QLYS | Posey Bruce K | CHIEF LEGAL OFFICER | 10/20/2026 | Verkauf | 185.31 | 7 | 1,297 | Form 4 |
| QLYS | Posey Bruce K | CHIEF LEGAL OFFICER | 10/20/2026 | Verkauf | 184.33 | 84 | 15,484 | Form 4 |
| QLYS | Thakar Sumedh S | CEO & PRESIDENT | 10/14/2026 | Verkauf | 192.84 | 500 | 96,419 | Form 4 |
| QLYS | Thakar Sumedh S | CEO & PRESIDENT | 10/14/2026 | Verkauf | 189.20 | 1,500 | 283,803 | Form 4 |
| QLYS | Thakar Sumedh S | CEO & PRESIDENT | 10/14/2026 | Verkauf | 194.30 | 400 | 77,721 | Form 4 |
| QLYS | Posey Bruce K | CHIEF LEGAL OFFICER | 09/21/2026 | Verkauf | 181.03 | 199 | 36,025 | Form 4 |
| QLYS | Posey Bruce K | CHIEF LEGAL OFFICER | 09/21/2026 | Verkauf | 179.95 | 327 | 58,844 | Form 4 |
| QLYS | Posey Bruce K | CHIEF LEGAL OFFICER | 09/21/2026 | Verkauf | 178.96 | 241 | 43,129 | Form 4 |
| QLYS | Posey Bruce K | CHIEF LEGAL OFFICER | 09/21/2026 | Verkauf | 177.98 | 27 | 4,806 | Form 4 |
| QLYS | Posey Bruce K | CHIEF LEGAL OFFICER | 09/21/2026 | Verkauf | 175.54 | 72 | 12,639 | Form 4 |
| QLYS | Thakar Sumedh S | CEO & PRESIDENT | 09/14/2026 | Verkauf | 173.92 | 500 | 86,960 | Form 4 |
| QLYS | Thakar Sumedh S | CEO & PRESIDENT | 09/14/2026 | Verkauf | 172.92 | 1,500 | 259,387 | Form 4 |
| QLYS | Thakar Sumedh S | CEO & PRESIDENT | 09/14/2026 | Verkauf | 162.43 | 300 | 48,729 | Form 4 |
| QLYS | Thakar Sumedh S | CEO & PRESIDENT | 09/14/2026 | Verkauf | 169.35 | 200 | 33,869 | Form 4 |
| QLYS | Thakar Sumedh S | CEO & PRESIDENT | 09/14/2026 | Verkauf | 174.71 | 100 | 17,471 | Form 4 |
| QLYS | Kim Joo Mi | CHIEF FINANCIAL OFFICER | 09/02/2026 | Verkauf | 172.37 | 102 | 17,582 | Form 4 |
| QLYS | Kim Joo Mi | CHIEF FINANCIAL OFFICER | 09/02/2026 | Verkauf | 171.14 | 265 | 45,353 | Form 4 |
| QLYS | Kim Joo Mi | CHIEF FINANCIAL OFFICER | 09/02/2026 | Verkauf | 170.05 | 204 | 34,690 | Form 4 |
| QLYS | Kim Joo Mi | CHIEF FINANCIAL OFFICER | 09/02/2026 | Verkauf | 168.75 | 166 | 28,013 | Form 4 |
| QLYS | Kim Joo Mi | CHIEF FINANCIAL OFFICER | 09/02/2026 | Verkauf | 167.49 | 293 | 49,074 | Form 4 |
| QLYS | Berquist Thomas | Director | 09/02/2026 | Verkauf | 175.27 | 511 | 89,563 | Form 4 |
| QLYS | Pfeiffer Wendy | Director | 08/20/2026 | Verkauf | 185.00 | 500 | 92,500 | Form 4 |
| QLYS | Posey Bruce K | CHIEF LEGAL OFFICER | 08/20/2026 | Verkauf | 185.91 | 280 | 52,056 | Form 4 |
| QLYS | Posey Bruce K | CHIEF LEGAL OFFICER | 08/20/2026 | Verkauf | 184.25 | 96 | 17,688 | Form 4 |
| QLYS | Posey Bruce K | CHIEF LEGAL OFFICER | 08/20/2026 | Verkauf | 183.58 | 393 | 72,148 | Form 4 |
| QLYS | Posey Bruce K | CHIEF LEGAL OFFICER | 08/20/2026 | Verkauf | 181.99 | 97 | 17,653 | Form 4 |
| QLYS | Thakar Sumedh S | CEO & PRESIDENT | 08/14/2026 | Verkauf | 192.27 | 100 | 19,227 | Form 4 |
| QLYS | Thakar Sumedh S | CEO & PRESIDENT | 08/14/2026 | Verkauf | 190.49 | 600 | 114,295 | Form 4 |
| QLYS | Thakar Sumedh S | CEO & PRESIDENT | 08/14/2026 | Verkauf | 189.41 | 1,300 | 246,232 | Form 4 |
| QLYS | Thakar Sumedh S | CEO & PRESIDENT | 08/14/2026 | Verkauf | 188.07 | 794 | 149,326 | Form 4 |
| QLYS | Thakar Sumedh S | CEO & PRESIDENT | 08/14/2026 | Verkauf | 186.28 | 406 | 75,628 | Form 4 |
| QLYS | Kim Joo Mi | CHIEF FINANCIAL OFFICER | 08/03/2026 | Verkauf | 154.51 | 827 | 127,779 | Form 4 |
| QLYS | Kim Joo Mi | CHIEF FINANCIAL OFFICER | 08/03/2026 | Verkauf | 152.78 | 300 | 45,834 | Form 4 |
| QLYS | Kim Joo Mi | CHIEF FINANCIAL OFFICER | 08/03/2026 | Verkauf | 151.47 | 200 | 30,294 | Form 4 |
| QLYS | Kim Joo Mi | CHIEF FINANCIAL OFFICER | 08/03/2026 | Verkauf | 155.12 | 100 | 15,512 | Form 4 |
| QLYS | Kim Joo Mi | CHIEF FINANCIAL OFFICER | 08/01/2026 | Steuer-Abgabe | 144.75 | 3,845 | 556,564 | Form 4 |
| QLYS | Thakar Sumedh S | CEO & PRESIDENT | 08/01/2026 | Steuer-Abgabe | 144.75 | 6,748 | 976,773 | Form 4 |
| QLYS | Posey Bruce K | CHIEF LEGAL OFFICER | 08/01/2026 | Steuer-Abgabe | 144.75 | 2,269 | 328,438 | Form 4 |
| QLYS | Pfeiffer Wendy | Director | 07/20/2026 | Verkauf | 158.19 | 500 | 79,095 | Form 4 |
| QLYS | Posey Bruce K | CHIEF LEGAL OFFICER | 07/20/2026 | Verkauf | 160.18 | 43 | 6,888 | Form 4 |
| QLYS | Posey Bruce K | CHIEF LEGAL OFFICER | 07/20/2026 | Verkauf | 159.35 | 262 | 41,749 | Form 4 |
| QLYS | Posey Bruce K | CHIEF LEGAL OFFICER | 07/20/2026 | Verkauf | 158.06 | 334 | 52,791 | Form 4 |
| QLYS | Posey Bruce K | CHIEF LEGAL OFFICER | 07/20/2026 | Verkauf | 156.71 | 243 | 38,081 | Form 4 |
| QLYS | Thakar Sumedh S | CEO & PRESIDENT | 07/14/2026 | Verkauf | 161.69 | 1,570 | 253,861 | Form 4 |
| QLYS | Thakar Sumedh S | CEO & PRESIDENT | 07/14/2026 | Verkauf | 160.81 | 730 | 117,395 | Form 4 |
| QLYS | Thakar Sumedh S | CEO & PRESIDENT | 07/14/2026 | Verkauf | 163.57 | 200 | 32,713 | Form 4 |
| QLYS | Thakar Sumedh S | CEO & PRESIDENT | 07/14/2026 | Verkauf | 155.30 | 100 | 15,530 | Form 4 |
A compact market overview — not investment advice. Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q).