Comparable stake leader
TANG CAPITAL MANAGEMENT LLC
SEC ownership of iTeos Therapeutics, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001808865.
Disclosed value leader
RA CAPITAL MANAGEMENT, L.P.
Comparable rows
9/18
Latest evidence
29 Aug 2025
- Parsed ownership sources
-
13D/G and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
TANG CAPITAL MANAGEMENT LLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
9 of 18
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
TANG CAPITAL MANAGEMENT LLC
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
29 Aug 2025
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001808865
- Issuer location
- Watertown, 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 iTeos Therapeutics, 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
TANG CAPITAL MANAGEMENT LLC
Disclosed value leader
RA CAPITAL MANAGEMENT, L.P.
Comparable rows
9/18
Latest evidence
29 Aug 2025
13D/G
3/4/5
Lead comparable stake: 100%
9 rows are not safely comparable across share classes.
13D/G row: TANG CAPITAL MANAGEMENT LLC
Showing 1-8 of 18 holder rows.
Quick read
TANG CAPITAL MANAGEMENT LLC leads the comparable SEC ownership view at 100%.
9 of 18 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 TANG CAPITAL MANAGEMENT LLC's linked filing trail.
Comparable ownership
Top 5
TANG CAPITAL MANAGEMENT LLC
100%
EcoR1 Capital, LLC
28%
BlackRock Portfolio Management LLC
6.1%
BlackRock, Inc.
5.7%
RA CAPITAL MANAGEMENT, L.P.
4.9%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 18 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| TANG CAPITAL MANAGEMENT LLC |
13D/G
|
100%
|
$101,100
10,000 shares
|
-$38,586,756 | 29 Aug 2025 |
| EcoR1 Capital, LLC |
3/4/5
13D/G
10%+ Owner
|
28%
from 13D/G
|
$85,511,824
10,688,978 shares
|
— | 14 May 2025 |
| BlackRock Portfolio Management LLC |
13D/G
|
6.1%
|
$17,124,228
2,329,827 shares
|
$0 | 31 Mar 2025 |
| BlackRock, Inc. |
13D/G
|
5.7%
|
$16,018,737
2,179,420 shares
|
$0 | 31 Mar 2025 |
| RA CAPITAL MANAGEMENT, L.P. |
3/4/5
13D/G
Former 10% Owner
|
4.9%
from 13D/G
|
$137,049,292
9,159,795 shares
mixed-class rows
|
— | 10 May 2024 |
| MPM BioVentures 2014, L.P. |
3/4/5
13D/G
Former 10% Owner · ANSBERT GADICKE
|
4.7%
from 13D/G
|
$16,995,267
2,108,594 shares
|
— | 13 May 2025 |
| Ansbert Gadicke |
3/4/5
Former 10% Owner
|
34528%
|
$27,829,543
3,452,797 shares
|
— | 13 May 2025 |
| MPM BIOVENTURES 2018, L.P. |
3/4/5
Former 10% Owner
|
21086%
|
$16,995,267
2,108,594 shares
|
— | 13 May 2025 |
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
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 13 Sep 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 23 reporting-owner rows connected to iTeos Therapeutics, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
23
Largest Forms 3/4/5 holder
RA CAPITAL MANAGEMENT, L.P.
Net 12M change
$0
Latest report
29 Aug 2025
Recent insider transactions for iTeos Therapeutics, 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| No insider transactions were found in the last 12 months for this issuer. | ||||||||||
* marks a reported price that did not pass the local price check.