Security key
00509G209
Acumen Pharmaceuticals, Inc. - Common Stock, $0.0001 par value per share (ABOS)
CUSIP: 00509G209
Q2 2026 13F Holders as of 30 Jun 2026
- Security type / class
- Equity / Common Stock, $0.0001 par value per share
- Total 13F shares
- 16,500
- Total 13F value
- $44,055
- Share change
- 0
- SEC-reported price per share
- $2.67
- Number of holders
- 1
- Shares outstanding
- 72,227,200
Holder snapshot
3 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q2 2026
Institutions
1
Top holders
1
ABOS full security history
Ownership snapshot
Full 13F holder table
Previous quarter: Q1 2026
Acumen Pharmaceuticals, Inc. SEC filings
Acumen Pharmaceuticals, Inc. company facts
Broader feeds
Reporting periods
Holder history for CUSIP 00509G209
Recent filing periods:
Ownership snapshot
Top reported holders of ABOS - Acumen Pharmaceuticals, Inc. - Common Stock, $0.0001 par value per share (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
15/15
Latest evidence
15 Jun 2026
13D/G
3/4/5
13F
Lead comparable stake: 30%
13D/G row: RA CAPITAL MANAGEMENT, L.P.
Showing 1-6 of 15 holder rows.
Quick read
RA CAPITAL MANAGEMENT, L.P. leads the comparable SEC ownership view at 30%.
15 of 15 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.
30%
Sands Capital Alternatives, LLC
5.6%
James B. Murray Jr.
5%
FRANKLIN RESOURCES INC
3.8%
Derrell Porter
0.05%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| RA CAPITAL MANAGEMENT, L.P. |
13D/G
3/4/5
13F
Director, 10%+ Owner · Company
|
30%
|
$55,075,356
21,101,669 shares
|
+$15,883,432 | 13 Mar 2026 |
| Sands Capital Alternatives, LLC |
13F
13D/G
Company
|
5.6%
from 13D/G
|
$8,779,448
3,720,105 shares
|
— | 31 Mar 2026 |
| James B. Murray Jr. |
13D/G
|
5%
|
$9,425,650
3,611,360 shares
|
$0 | 04 Apr 2025 |
| FRANKLIN RESOURCES INC |
13F
13D/G
Company
|
3.8%
from 13D/G
|
$5,440,027
2,305,096 shares
|
— | 31 Mar 2026 |
| Derrell Porter |
3/4/5
Director
|
0.05%
|
$82,537
35,500 shares
|
-$75,240 | 15 Jun 2026 |
| Alyeska Investment Group, L.P. |
13F
Company
|
3.4%
|
$5,776,765
2,454,754 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.
13F holder rows
Institutional holders as of Q2 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
1
Shares
16,500
Rows available
1
| 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 Q2 2026 vs Q1 2026 Across Filers
Q1 2026 holders
84
Q2 2026 holders
1
Holder diff
-83
| Investor | Q1 2026 Shares | Q2 2026 Shares | Share Diff | Share Chg % | Q1 2026 value | Q2 2026 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend