Comparable stake leader
RA CAPITAL MANAGEMENT, L.P.
SEC ownership of PepGen Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001835597.
Disclosed value leader
RA CAPITAL MANAGEMENT, L.P.
Comparable rows
50/50
Latest evidence
30 Jun 2026
- Public ticker
- PEPG on Nasdaq
- Parsed ownership sources
-
3/4/5, 13D/G, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
RA CAPITAL MANAGEMENT, L.P.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
RA CAPITAL MANAGEMENT, L.P.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
30 Jun 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001835597
- Issuer location
- Boston, MA
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 PepGen 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
RA CAPITAL MANAGEMENT, L.P.
Disclosed value leader
RA CAPITAL MANAGEMENT, L.P.
Comparable rows
50/50
Latest evidence
30 Jun 2026
3/4/5
13D/G
13F
Lead comparable stake: 29%
13D/G row: RA CAPITAL MANAGEMENT, L.P.
Showing 1-8 of 50 holder rows.
Quick read
RA CAPITAL MANAGEMENT, L.P. leads the comparable SEC ownership view at 29%.
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 RA CAPITAL MANAGEMENT, L.P.'s linked filing trail.
Comparable ownership
Top 5
RA CAPITAL MANAGEMENT, L.P.
29%
Oxford Science Enterprises plc
7.2%
Commodore Capital LP
6.5%
VIKING GLOBAL INVESTORS LP
5%
Point72 Asset Management, L.P.
3%
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 |
|---|---|---|---|---|---|
| RA CAPITAL MANAGEMENT, L.P. |
3/4/5
13D/G
13F
Director, 10%+ Owner · Company
|
29%
from 13D/G
|
$59,373,673
18,588,273 shares
mixed-class rows
|
+$30,000,000 | 18 Jun 2026 |
| Oxford Science Enterprises plc |
3/4/5
13D/G
Former 10% Owner
|
7.2%
from 13D/G
|
$15,857,241
4,955,388 shares
|
+$640,000 | 30 Sep 2025 |
| Commodore Capital LP |
13F
13D/G
Company
|
6.5%
from 13D/G
|
$8,055,000
4,475,000 shares
|
— | 30 Jun 2026 |
| VIKING GLOBAL INVESTORS LP |
13F
13D/G
Company
|
5%
from 13D/G
|
$6,268,381
3,482,434 shares
|
— | 30 Jun 2026 |
| Point72 Asset Management, L.P. |
13D/G
13F
Company
|
3%
|
$9,551,949
2,067,432 shares
|
-$2,811,415 | 30 Sep 2025 |
| Janus Henderson Group Ltd. |
13D/G
JANUS HENDERSON GROUP PLC
|
1.6%
|
$835,610
522,256 shares
|
$0 | 31 Dec 2024 |
| MONTANOVA CAPITAL, LLC |
13D/G
SUVRETTA CAPITAL MANAGEMENT, LLC
|
0.9%
|
$354,000
300,000 shares
|
-$1,605,900 | 30 Jun 2025 |
| Laurion Capital Management LP |
13F
Company
|
4%
|
$4,951,539
2,750,855 shares
|
— | 30 Jun 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 buying over the last 12 months. Net value: +$30,580,688.
Buys
$30,640,000
Insiders: 2
Sells
$59,312
Insiders: 4
Net
+$30,580,688
Shares: +9,564,529
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 9,575,000
Shares: 10,471
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 1,233 | $0 | $1,739 | -$1,739 |
| 6-9 | 0 | 9,238 | $0 | $57,573 | -$57,573 |
| 9-12 | 9,575,000 | 0 | $30,640,000 | $0 | +$30,640,000 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 25 reporting-owner rows connected to PepGen Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
25
Largest Forms 3/4/5 holder
RA CAPITAL MANAGEMENT, L.P.
Net 12M change
+$30,580,688
Latest report
18 Jun 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| RA CAPITAL MANAGEMENT, L.P. | Director, 10%+ Owner | $59,373,673 | +$30,000,000 | +102% | Filing P/S | 18 Jun 2026 |
| Oxford Science Enterprises plc | Former 10% Owner | $15,857,241 | +$640,000 | +4.2% | Filing P/S | 30 Sep 2025 |
| James E. Flynn | Possible Member of 10% Group, 10%+ Owner | $3,971,852 | Mixed | 10 May 2022 | ||
| James G. McArthur | President and CEO, Director | $1,874,261 | -$32,876 | -1.7% | Filing P/S | 04 Mar 2026 |
| Noel Donnelly | Chief Financial Officer | $705,888 | -$12,988 | -1.8% | Filing P/S | 04 Mar 2026 |
| Paul Streck | EVP, Head of R&D | $479,309 | -$11,709 | -2.4% | Filing P/S | 04 Mar 2026 |
| Joseph Vittiglio | Chief Business & Legal Officer | $391,016 | Mixed | 01 Mar 2026 | ||
| Kasra Kasraian | Chief Technical Officer | $70,639 | -$1,739 | -2.4% | Filing P/S | 21 May 2026 |
| Mary Beth DeLena | General Counsel | $25,146 | Mixed | 03 Mar 2025 | ||
| Michelle L. Mellion | Chief Medical Officer | $0 | Mixed | 24 Jul 2024 | ||
| Niels Svenstrup | SVP, Chem. Mfg & Controls | $0 | Mixed | 17 May 2024 | ||
| RA Capital Nexus Fund II, L.P. | Director | Mixed | 18 Jun 2026 | |||
| Peter Kolchinsky | Director, 10%+ Owner | Mixed | 18 Jun 2026 | |||
| Rajeev M. Shah | Director, 10%+ Owner | Mixed | 18 Jun 2026 | |||
| Sonia Bracegirdle | Sr. VP Strategy & Operations | Mixed | 06 May 2022 | |||
| Lisa Wyman | Director | Mixed | 18 Jun 2026 | |||
| Laurie Keating | Director | Mixed | 18 Jun 2026 | |||
| Heidi Henson | Director | Mixed | 18 Jun 2026 | |||
| Joshua Resnick | Director | Mixed | 18 Jun 2026 | |||
| Howard Mayer | Director | Mixed | 18 Jun 2026 |
Recent insider transactions for PepGen 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| RA CAPITAL MANAGEMENT, L.P. | PEPG | Stock Option (Right to Buy) | Award | 34,000 | 34,000 | 18 Jun 2026 | See Footnotes | |||
| RA CAPITAL MANAGEMENT, L.P. | PEPG | Stock Option (Right to Buy) | Award | 34,000 | 34,000 | 18 Jun 2026 | See Footnotes | |||
| Ra Capital Management, L.P. | PEPG | Stock Option (Right to Buy) | Award | 34,000 | 34,000 | 18 Jun 2026 | See Footnotes | |||
| Ra Capital Management, L.P. | PEPG | Stock Option (Right to Buy) | Award | 34,000 | 34,000 | 18 Jun 2026 | See Footnotes | |||
| Ra Capital Management, L.P. | PEPG | Stock Option (Right to Buy) | Award | 34,000 | 34,000 | 18 Jun 2026 | See Footnotes | |||
| Lisa Wyman | PEPG | Stock Option (Right to Buy) | Award | 34,000 | 34,000 | 18 Jun 2026 | Direct | |||
| Joshua Resnick | PEPG | Stock Option (Right to Buy) | Award | 34,000 | 34,000 | 18 Jun 2026 | Direct | |||
| Howard Mayer | PEPG | Stock Option (Right to Buy) | Award | 34,000 | 34,000 | 18 Jun 2026 | Direct | |||
| Mitchell H. Finer | PEPG | Stock Option (Right to Buy) | Award | 34,000 | 34,000 | 18 Jun 2026 | Direct | |||
| Habib J. Dable | PEPG | Stock Option (Right to Buy) | Award | 34,000 | 34,000 | 18 Jun 2026 | Direct | |||
| Heidi Henson | PEPG | Stock Option (Right to Buy) | Award | 34,000 | 34,000 | 18 Jun 2026 | Direct | |||
| Laurie Keating | PEPG | Stock Option (Right to Buy) | Award | 34,000 | 34,000 | 18 Jun 2026 | Direct | |||
| Kasra Kasraian | PEPG | Common Stock | Sale | -2.4% | $1,739 | $1.41 | -1,233 | 50,074 | 21 May 2026 | Direct |
| Paul Streck | PEPG | Common Stock | Sale | -2.41% | $11,709 | $6.23 | -1,879 | 76,226 | 04 Mar 2026 | Direct |
| Noel Donnelly | PEPG | Common Stock | Sale | -1.83% | $12,988 | $6.23 | -2,084 | 111,603 | 04 Mar 2026 | Direct |
| James G. McArthur | PEPG | Common Stock | Sale | -1.75% | $32,876 | $6.23 | -5,275 | 296,326 | 04 Mar 2026 | Direct |
| Joseph Vittiglio | PEPG | Common Stock | Award | 87.8% | 30,717 | 65,717 | 01 Mar 2026 | Direct | ||
| Joseph Vittiglio | PEPG | Stock Option (Right to Buy) | Award | 120,000 | 120,000 | 01 Mar 2026 | Direct | |||
| Kasra Kasraian | PEPG | Common Stock | Award | 206.3% | 34,557 | 51,307 | 01 Mar 2026 | Direct | ||
| Kasra Kasraian | PEPG | Stock Option (Right to Buy) | Award | 135,000 | 135,000 | 01 Mar 2026 | Direct | |||
| Paul Streck | PEPG | Common Stock | Award | 180.9% | 50,300 | 78,105 | 01 Mar 2026 | Direct | ||
| Paul Streck | PEPG | Stock Option (Right to Buy) | Award | 196,500 | 196,500 | 01 Mar 2026 | Direct | |||
| Noel Donnelly | PEPG | Common Stock | Award | 208.1% | 76,793 | 113,687 | 01 Mar 2026 | Direct | ||
| Noel Donnelly | PEPG | Stock Option (Right to Buy) | Award | 300,000 | 300,000 | 01 Mar 2026 | Direct | |||
| James G. McArthur | PEPG | Common Stock | Award | 164.8% | 187,688 | 301,601 | 01 Mar 2026 | Direct | ||
| James G. McArthur | PEPG | Stock Option (Right to Buy) | Award | 731,250 | 731,250 | 01 Mar 2026 | Direct | |||
| Joseph Vittiglio | PEPG | Common Stock | Award | 35,000 | 35,000 | 08 Dec 2025 | Direct | |||
| Joseph Vittiglio | PEPG | Stock Option (Right to Buy) | Award | 160,000 | 160,000 | 08 Dec 2025 | Direct | |||
| Paul Streck | PEPG | Stock Option (Right to Buy) | Award | 242,816 | 242,816 | 04 Nov 2025 | Direct | |||
| Paul Streck | PEPG | Stock Option (Right to Buy) | Disposed to Issuer | -100% | -242,816 | 0 | 04 Nov 2025 | Direct | ||
| James G. McArthur | PEPG | Stock Option (Right to Buy) | Award | 1,516,245 | 466,095 | 04 Nov 2025 | Direct | |||
| James G. McArthur | PEPG | Stock Option (Right to Buy) | Disposed to Issuer | -100% | -1,516,245 | 0 | 04 Nov 2025 | Direct | ||
| Noel Donnelly | PEPG | Stock Option (Right to Buy) | Award | 660,376 | 203,339 | 04 Nov 2025 | Direct | |||
| Noel Donnelly | PEPG | Stock Option (Right to Buy) | Disposed to Issuer | -100% | -660,376 | 0 | 04 Nov 2025 | Direct | ||
| Oxford Science Enterprises plc | PEPG | Common Stock | Purchase | 4.21% | $640,000 | $3.20 | 200,000 | 4,955,388 | 30 Sep 2025 | Direct |
| Ra Capital Management, L.P. | PEPG | Common Stock | Purchase | 102.1% | $30,000,000 | $3.20 | 9,375,000 | 18,554,273 | 26 Sep 2025 | See footnotes |
* marks a reported price that did not pass the local price check.