Security key
55287L101
- Security type / class
- Equity / Common Stock
- Total 13F shares
- 30,305,441
- Total 13F value
- $784,071,713
- Share change
- +30,303,631
- SEC-reported price per share
- $25.98
- Number of holders
- 45
- Value change
- +$784,024,689
- Number of buys
- 44
- Shares outstanding
- 47,785,109
Holder snapshot
5 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q3 2024
Institutions
45
Top holders
10
MBX full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q2 2026
MBX Biosciences, Inc. SEC filings
MBX Biosciences, Inc. company facts
Broader feeds
Reporting periods
Holder history for CUSIP 55287L101
Recent filing periods:
Ownership snapshot
Top reported holders of MBX - MBX Biosciences, 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
Frazier Life Sciences X, ...
Disclosed value leader
Frazier Life Sciences X, ...
Comparable rows
0/11
Latest evidence
16 Sep 2024
3/4/5
Highest disclosed value: $48,669,154
11 rows are not safely comparable across share classes.
Showing 1-6 of 11 holder rows.
Quick read
Frazier Life Sciences X, L.P. has the largest disclosed position value at $48.67M.
0 of 11 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 Frazier Life Sciences X, L.P.'s linked filing trail.
Disclosed position value
Top 5
Frazier Life Sciences X, L.P.
$48.67M
Ali Behbahani
$38.64M
Anthony A. Florence Jr.
$38.64M
Carmen Chang
$38.64M
Forest Baskett
$38.64M
Value bars compare disclosed positions; verify each figure against the linked filing evidence.
Detailed SEC evidence table Showing 1-6 of 11 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Frazier Life Sciences X, L.P. |
3/4/5
10%+ Owner
|
—
class O/S missing
|
$48,669,154
4,552,774 shares
|
— | 16 Sep 2024 |
| Ali Behbahani |
3/4/5
10%+ Owner
|
—
class O/S missing
|
$38,638,855
3,614,486 shares
|
— | 16 Sep 2024 |
| Anthony A. Florence Jr. |
3/4/5
10%+ Owner
|
—
class O/S missing
|
$38,638,855
3,614,486 shares
|
— | 16 Sep 2024 |
| Carmen Chang |
3/4/5
10%+ Owner
|
—
class O/S missing
|
$38,638,855
3,614,486 shares
|
— | 16 Sep 2024 |
| Forest Baskett |
3/4/5
10%+ Owner
|
—
class O/S missing
|
$38,638,855
3,614,486 shares
|
— | 16 Sep 2024 |
| Mohamad Makhzoumi |
3/4/5
10%+ Owner
|
—
class O/S missing
|
$38,638,855
3,614,486 shares
|
— | 16 Sep 2024 |
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 Q3 2024
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
45
Shares
30,305,441
Rows available
45
| 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 Q3 2024 vs Q2 2024 Across Filers
Q2 2024 holders
0
Q3 2024 holders
45
Holder diff
45
| Investor | Q2 2024 Shares | Q3 2024 Shares | Share Diff | Share Chg % | Q2 2024 value | Q3 2024 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend