QLYS QUALYS, INC.: institutional ownership and insider trading
480 funds reported holding $5.79B of QUALYS, INC. in their latest 13F filings; in Q2 2026 funds net bought $22.8M, with 87 new positions and 70 funds selling out; over the last 12 months insiders bought $0 and sold $23.2M on the open market.
Famous investors holding QLYS
- Renaissance Technologies (Renaissance Technologies): $39.1M, 0.1% of the portfolio
- Izzy Englander (Millennium Management): $105M, 0.0% of the portfolio
- Ken Griffin (Citadel Advisors): $64.3M, 0.0% of the portfolio
- D. E. Shaw (D. E. Shaw & Co.): $2.74M, 0.0% of the portfolio
- Two Sigma (Two Sigma Investments): $2.33M, 0.0% of the portfolio
Largest institutional holders of QLYS
- BlackRock, Inc. (BLK) — $792M
- VANGUARD GROUP INC — $580M
- VANGUARD PORTFOLIO MANAGEMENT LLC — $371M
- VANGUARD CAPITAL MANAGEMENT LLC — $219M
- STATE STREET CORP (STT, STT-PG) — $200M
- Legal & General Group Plc — $198M
- GEODE CAPITAL MANAGEMENT, LLC — $194M
- AQR CAPITAL MANAGEMENT LLC — $191M
- FIRST TRUST ADVISORS LP — $155M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP — $135M
Recent QLYS insider trades
- Oct 20, 2026: Posey Bruce K sold 881 shares ($167K)
- Oct 14, 2026: Thakar Sumedh S sold 3,200 shares ($609K)
- Sep 21, 2026: Posey Bruce K sold 866 shares ($155K)
- Sep 14, 2026: Thakar Sumedh S sold 3,200 shares ($544K)
Members of Congress trading QLYS
- Oct 31, 2025: Lisa C. McClain sold $1.00K–$15.0K
- Oct 30, 2025: Lisa C. McClain bought $1.00K–$15.0K
- Oct 30, 2025: Lisa C. McClain sold $1.00K–$15.0K
- Sep 11, 2025: Lisa C. McClain bought $1.00K–$15.0K
5%+ owners
- Vanguard Portfolio Management: 7.2% (Schedule 13G, filed Apr 29, 2026)
- Vanguard Capital Management: 5.2% (Schedule 13G, filed Apr 30, 2026)