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RGNX · REGENXBIO Inc.

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$8.91 +0.86 (+10.61%) At close · Aug 25
Market Cap
$531.74M
Shares
66.01M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 166
Total Value: $512,705,357
Total Shares: 42,871,340

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 166 13F filers · Δ vs Mar 31, 2026
Top Holder
14.9%
Sep 2023 → Jun 2026 · range 12.9% – 21.4%
+1.6 pts
Top 5
42.2%
Sep 2023 → Jun 2026 · range 42.2% – 60.0%
−0.4 pts
Top 10
59.5%
Sep 2023 → Jun 2026 · range 59.5% – 74.3%
−1.1 pts
HHI
532
Sep 2023 → Jun 2026 · range 516 – 904
Broadly held+17

Quarterly Activity

vs Mar 31, 2026
New
26
Increased
62
Decreased
53
Sold Out
40
Unchanged
25
Holder count: -14
Institutional value: +41.3%
Shares held: -1.0%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 174
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1590877 CUSIP 75901B107 13F (30d) 146 filings 146 filers Visit website Investor relations