Regenxbio RGNX Institutional Ownership

Updated Oct 11, 2026

REGENXBIO Inc. (NASDAQ:RGNX) was held by 165 institutional investors that filed 13F reports for the quarter ended June 30, 2026.

• These investors held 77.89% of outstanding shares in Q2 2026, down from 82.22% the quarter before.
• Total shares held in Regenxbio fell 0.60% from Q1 2026, while the number of holders rose 6.45% from Q2 2025.
• Of these 165 holders, 87 added to their positions, 52 reduced their stakes and 26 left their positions unchanged.
• The aggregate institutional position in Regenxbio was 42.19Mn shares at the end of Q2 2026, down 254.05K from the prior quarter and up 1.49Mn from a year earlier.
• As of June 30, 2026, BlackRock, Inc. held the largest stake in Regenxbio with 6.4Mn shares, or 11.81% of shares outstanding.
• Among existing holders, the largest additions to Regenxbio in Q2 2026 came from BlackRock, Inc. (+614.63K shares), D. E. Shaw & Co., Inc. (+426.81K shares), Vanguard Portfolio Management LLC (+336.65K shares), AQR Capital Management LLC (+326.65K shares) and Quantinno Capital Management LP (+256.18K shares).
• Holders that trimmed the most shares of Regenxbio in Q2 2026 while keeping a position were JPMorgan Chase & Co (-1.27Mn shares), Assenagon Asset Management S.A. (-811.33K shares), Integral Health Asset Management, LLC (-700K shares), Goldman Sachs Group Inc (-418.01K shares) and Dimensional Fund Advisors LP (-278.8K shares).
• According to Business Quant data, the leading holders of RGNX for Q2 2026 were BlackRock, Inc. (6.4Mn shares), Redmile Group, LLC (4.37Mn shares), State Street Corp (2.97Mn shares), JPMorgan Chase & Co (2.21Mn shares), Vanguard Capital Management LLC (2.11Mn shares), Morgan Stanley (1.95Mn shares), Goldman Sachs Group Inc (1.42Mn shares), AQR Capital Management LLC (1.38Mn shares), Vanguard Portfolio Management LLC (1.36Mn shares) and Marshall Wace, LLP (1.28Mn shares).