Comparable stake leader
Redmile Group, LLC
SEC ownership of REGENXBIO Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001590877.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
31 Mar 2026
- Public ticker
- RGNX on Nasdaq
- Parsed ownership sources
-
13D/G and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Redmile Group, LLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Redmile Group, LLC
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
31 Mar 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001590877
- Issuer location
- Rockville, MD
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of REGENXBIO Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Redmile Group, LLC
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
31 Mar 2026
13D/G
13F
Lead comparable stake: 9.9%
13D/G row: Redmile Group, LLC
Showing 1-8 of 50 holder rows.
Quick read
Redmile Group, LLC leads the comparable SEC ownership view at 9.9%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Redmile Group, LLC's linked filing trail.
Comparable ownership
Top 5
Redmile Group, LLC
9.9%
BlackRock, Inc.
7.3%
STATE STREET CORP
5.3%
JPMORGAN CHASE & CO
4.4%
BlackRock Portfolio Management LLC
4.1%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Redmile Group, LLC |
13D/G
13F
Company
|
9.9%
|
$43,942,300
5,062,477 shares
|
$0 | 30 Jun 2025 |
| BlackRock, Inc. |
13F
13D/G
Company
|
7.3%
from 13D/G
|
$48,459,930
5,782,808 shares
|
— | 31 Mar 2026 |
| STATE STREET CORP |
13D/G
13F
STATE STREET CORPORATION · Company
|
5.3%
|
$22,890,414
2,731,553 shares
|
+$4,572,983 | 31 Mar 2026 |
| JPMORGAN CHASE & CO |
13F
13D/G
Company
|
4.4%
from 13D/G
|
$27,069,126
3,483,800 shares
|
— | 31 Mar 2026 |
| BlackRock Portfolio Management LLC |
13D/G
|
4.1%
|
$30,032,914
2,085,619 shares
|
-$15,091,042 | 31 Dec 2025 |
| MORGAN STANLEY |
13F
Company
|
4%
|
$17,314,400
2,066,157 shares
|
— | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
3.9%
|
$16,819,883
2,007,146 shares
|
— | 31 Mar 2026 |
| GOLDMAN SACHS GROUP INC |
13F
Company
|
3.6%
|
$15,414,700
1,839,463 shares
|
— | 31 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$1,356,569.
Buys
$0
Insiders: 0
Sells
$1,356,569
Insiders: 2
Net
-$1,356,569
Shares: -115,096
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 115,096
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 58,494 | $0 | $718,232 | -$718,232 |
| 3-6 | 0 | 20,433 | $0 | $221,739 | -$221,739 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 36,169 | $0 | $416,598 | -$416,598 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-18 of 18 reporting-owner rows connected to REGENXBIO Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
18
Largest Forms 3/4/5 holder
Allan M. Fox
Net 12M change
-$1,356,568
Latest report
01 Aug 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Allan M. Fox | Director | $24,396,919 | Mixed | 29 May 2026 | ||
| Mills Kenneth T. | Director | $4,155,851 | Mixed | 29 May 2026 | ||
| Curran Simpson | Chief Executive Officer, Director | $4,050,043 | -$416,598 | -9.3% | Median | 06 Jan 2026 |
| Patrick J. Christmas | Chief Strategy & Legal Officer | $2,467,496 | Median | 01 Aug 2026 | ||
| Steve Pakola | Chief Medical Officer | $2,462,381 | -$939,970 | -28% | Median | 01 Aug 2026 |
| Mitchell Chan | Chief Financial Officer | $1,839,137 | Mixed | 06 Jan 2026 | ||
| Olivier Danos | Chief Scientific Officer | $1,826,628 | Mixed | 01 Feb 2025 | ||
| Craig Malzahn | Chief Technology Officer | $1,183,601 | Mixed | 06 Jan 2026 | ||
| Vittal Vasista | Chief Financial Officer | $926,968 | Mixed | 19 Mar 2024 | ||
| Jennifer Zachary | Director | $267,078 | Mixed | 29 May 2026 | ||
| Alexandra Glucksmann | Director | $241,855 | Mixed | 29 May 2026 | ||
| Daniel Tasse | Director | $241,855 | Mixed | 29 May 2026 | ||
| Jean Bennett | Director | $241,855 | Mixed | 29 May 2026 | ||
| Argeris N. Karabelas | Director | $241,855 | Mixed | 29 May 2026 | ||
| George Migausky V | Director | $241,855 | Mixed | 29 May 2026 | ||
| David C. Stump | Director | $241,855 | Mixed | 29 May 2026 | ||
| Daniel Abdun-Nabi | Director | Mixed | 04 Jun 2021 | |||
| Luke M. Beshar | Director | Mixed | 04 Jun 2021 |
Recent insider transactions for REGENXBIO Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Steve Pakola | RGNX | Common Stock | Tax liability | -3.51% | -7,468 | 205,541 | 01 Aug 2026 | Direct | ||
| Patrick J. Christmas | RGNX | Common Stock | Tax liability | -2.23% | -4,699 | 205,968 | 01 Aug 2026 | Direct | ||
| Steve Pakola | RGNX | Common Stock | Sale | -1% | $29,476 | $13.64 | -2,161 | 213,009 | 02 Jul 2026 | Direct |
| Steve Pakola | RGNX | Common Stock | Options Exercise | 1.01% | 2,161 | 215,170 | 02 Jul 2026 | Direct | ||
| Steve Pakola | RGNX | Stock Options (Right to Buy) | Options Exercise | -3.23% | -2,161 | 64,812 | 02 Jul 2026 | Direct | ||
| Curran Simpson | RGNX | Common Stock | Tax liability | -1.98% | -6,818 | 338,053 | 01 Jul 2026 | Direct | ||
| Steve Pakola | RGNX | Common Stock | Sale | -14.7% | $472,284 | $12.86 | -36,725 | 213,009 | 01 Jul 2026 | Direct |
| Steve Pakola | RGNX | Common Stock | Options Exercise | 17.2% | 36,725 | 249,734 | 01 Jul 2026 | Direct | ||
| Steve Pakola | RGNX | Stock Options (Right to Buy) | Options Exercise | -35.4% | -36,725 | 66,973 | 01 Jul 2026 | Direct | ||
| Curran Simpson | RGNX | Common Stock | Award | 0.42% | 1,453 | 344,871 | 30 Jun 2026 | Direct | ||
| Steve Pakola | RGNX | Common Stock | Sale | -8.43% | $216,472 | $11.04 | -19,608 | 213,009 | 29 Jun 2026 | Direct |
| Daniel Tasse | RGNX | Common Stock | Award | 51.5% | 9,807 | 28,861 | 29 May 2026 | Direct | ||
| Daniel Tasse | RGNX | Stock Options (Right to Buy) | Award | 46,600 | 46,600 | 29 May 2026 | Direct | |||
| David C. Stump | RGNX | Common Stock | Award | 51.5% | 9,807 | 28,861 | 29 May 2026 | Direct | ||
| David C. Stump | RGNX | Stock Options (Right to Buy) | Award | 46,600 | 46,600 | 29 May 2026 | Direct | |||
| Jennifer Zachary | RGNX | Common Stock | Award | 44.4% | 9,807 | 31,871 | 29 May 2026 | Direct | ||
| Jennifer Zachary | RGNX | Stock Options (Right to Buy) | Award | 46,600 | 46,600 | 29 May 2026 | Direct | |||
| Mills Kenneth T. | RGNX | Common Stock | Award | 2.02% | 9,807 | 495,925 | 29 May 2026 | Direct | ||
| Mills Kenneth T. | RGNX | Stock Options (Right to Buy) | Award | 46,600 | 46,600 | 29 May 2026 | Direct | |||
| George Migausky V | RGNX | Common Stock | Award | 51.5% | 9,807 | 28,861 | 29 May 2026 | Direct | ||
| George Migausky V | RGNX | Stock Options (Right to Buy) | Award | 46,600 | 46,600 | 29 May 2026 | Direct | |||
| Argeris N. Karabelas | RGNX | Common Stock | Award | 51.5% | 9,807 | 28,861 | 29 May 2026 | Direct | ||
| Argeris N. Karabelas | RGNX | Stock Options (Right to Buy) | Award | 46,600 | 46,600 | 29 May 2026 | Direct | |||
| Alexandra Glucksmann | RGNX | Common Stock | Award | 51.5% | 9,807 | 28,861 | 29 May 2026 | Direct | ||
| Alexandra Glucksmann | RGNX | Stock Options (Right to Buy) | Award | 46,600 | 46,600 | 29 May 2026 | Direct | |||
| Allan M. Fox | RGNX | Common Stock | Award | 51.5% | 9,807 | 28,861 | 29 May 2026 | Direct | ||
| Allan M. Fox | RGNX | Stock Options (Right to Buy) | Award | 46,600 | 46,600 | 29 May 2026 | Direct | |||
| Jean Bennett | RGNX | Common Stock | Award | 51.5% | 9,807 | 28,861 | 29 May 2026 | Direct | ||
| Jean Bennett | RGNX | Stock Options (Right to Buy) | Award | 46,600 | 46,600 | 29 May 2026 | Direct | |||
| Steve Pakola | RGNX | Common Stock | Sale | -6.17% | $168,705 | $11.02 | -15,309 | 232,617 | 11 May 2026 | Direct |
| Steve Pakola | RGNX | Common Stock | Sale | -2.02% | $53,033 | $10.35 | -5,124 | 247,926 | 10 Mar 2026 | Direct |
| Steve Pakola | RGNX | Common Stock | Tax liability | -2.04% | -5,267 | 253,050 | 01 Feb 2026 | Direct | ||
| Patrick J. Christmas | RGNX | Common Stock | Tax liability | -2.18% | -4,700 | 210,667 | 01 Feb 2026 | Direct | ||
| Mills Kenneth T. | RGNX | Common Stock | Tax liability | -31.3% | -221,753 | 486,118 | 27 Jan 2026 | Direct | ||
| Mills Kenneth T. | RGNX | Common Stock | Options Exercise | 46.6% | 225,000 | 707,871 | 27 Jan 2026 | Direct | ||
| Mills Kenneth T. | RGNX | Stock Options (Right to Buy) | Options Exercise | -50% | -225,000 | 225,000 | 27 Jan 2026 | Direct | ||
| Steve Pakola | RGNX | Common Stock | Award | 34.2% | 65,847 | 258,317 | 06 Jan 2026 | Direct | ||
| Steve Pakola | RGNX | Stock Options (Right to buy) | Award | 35,402 | 35,402 | 06 Jan 2026 | Direct | |||
| Craig Malzahn | RGNX | Common Stock | Award | 402.8% | 65,847 | 82,194 | 06 Jan 2026 | Direct | ||
| Craig Malzahn | RGNX | Stock Options (Right to buy) | Award | 35,402 | 35,402 | 06 Jan 2026 | Direct | |||
| Curran Simpson | RGNX | Common Stock | Award | 73.3% | 144,864 | 342,467 | 06 Jan 2026 | Direct | ||
| Curran Simpson | RGNX | Stock Options (Right to buy) | Award | 233,651 | 233,651 | 06 Jan 2026 | Direct | |||
| Patrick J. Christmas | RGNX | Common Stock | Award | 52.1% | 73,749 | 215,367 | 06 Jan 2026 | Direct | ||
| Patrick J. Christmas | RGNX | Stock Options (Right to buy) | Award | 39,650 | 39,650 | 06 Jan 2026 | Direct | |||
| Mitchell Chan | RGNX | Common Stock | Award | 136.6% | 73,749 | 127,717 | 06 Jan 2026 | Direct | ||
| Mitchell Chan | RGNX | Stock Options (Right to buy) | Award | 39,650 | 39,650 | 06 Jan 2026 | Direct | |||
| Curran Simpson | RGNX | Common Stock | Tax liability | -8.59% | -18,559 | 197,603 | 02 Jan 2026 | Direct | ||
| Craig Malzahn | RGNX | Common Stock | Tax liability | -7.04% | -1,238 | 16,347 | 02 Jan 2026 | Direct | ||
| Patrick J. Christmas | RGNX | Common Stock | Tax liability | -6.47% | -9,793 | 141,618 | 02 Jan 2026 | Direct | ||
| Steve Pakola | RGNX | Common Stock | Tax liability | -8.66% | -18,247 | 192,470 | 02 Jan 2026 | Direct |
* marks a reported price that did not pass the local price check.