Security key
254604101
- Security type / class
- Equity / COMMON STOCK
- Total 13F shares
- 10,800,037
- Total 13F value
- $214,639,221
- Share change
- +10,189,549
- SEC-reported price per share
- $19.89
- Number of holders
- 30
- Value change
- +$202,496,221
- Number of buys
- 28
- Shares outstanding
- 38,089,633
Holder snapshot
5 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q4 2022
Institutions
30
Top holders
10
IRON full security history
Ownership snapshot
Full 13F holder table
Disc Medicine, Inc. SEC filings
Disc Medicine, Inc. company facts
Broader feeds
Ownership snapshot
Top reported holders of IRON - Disc Medicine, Inc. - COMMON STOCK (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
Braden M. Leonard
Disclosed value leader
Braden M. Leonard
Comparable rows
0/9
Latest evidence
29 Dec 2022
3/4/5
Highest disclosed value: $354,993,375
9 rows are not safely comparable across share classes.
Showing 1-6 of 9 holder rows.
Quick read
Braden M. Leonard has the largest disclosed position value at $354.99M.
0 of 9 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 Braden M. Leonard's linked filing trail.
Disclosed position value
Top 4
Braden M. Leonard
$354.99M
James B. Tananbaum
$27.84M
Atlas Venture Opportunity Fund II...
$14.77M
Brian Piekos
$1.19M
Value bars compare disclosed positions; verify each figure against the linked filing evidence.
Detailed SEC evidence table Showing 1-6 of 9 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Braden M. Leonard |
3/4/5
10%+ Owner
|
—
class O/S missing
|
$354,993,375
5,247,500 shares
|
— | 26 Oct 2022 |
| James B. Tananbaum |
3/4/5
Director, 10%+ Owner
|
—
mixed-class rows
|
$27,837,975
428,745 shares
mixed-class rows
|
— | 04 Oct 2021 |
| Atlas Venture Opportunity Fund II, L.P. |
3/4/5
10%+ Owner
|
—
class O/S missing
|
$14,769,754
218,326 shares
|
— | 29 Dec 2022 |
| Carl L. Gordon |
3/4/5
Director, 10%+ Owner
|
—
class O/S missing
|
—
17,245 shares
|
— | 04 Oct 2021 |
| Jason P. Rhodes |
3/4/5
Director, 10%+ Owner
|
—
class O/S missing
|
—
17,245 shares
|
— | 04 Oct 2021 |
| Brian Piekos |
3/4/5
CFO
|
—
class O/S missing
|
$1,191,655
17,615 shares
|
— | 31 May 2022 |
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.
13F holder rows
Institutional holders as of Q4 2022
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
30
Shares
10,800,037
Rows available
30
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q4 2022 vs Q3 2022 Across Filers
Q3 2022 holders
0
Q4 2022 holders
30
Holder diff
30
| Investor | Q3 2022 Shares | Q4 2022 Shares | Share Diff | Share Chg % | Q3 2022 value | Q4 2022 value | Value change | Value Chg % |
|---|