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Acumen Pharmaceuticals, Inc.

ABOS
Healthcare|Biotechnology|US
$0.22
+0.01 (+4.54%)
DCF Value
$0.38
Tangible Book / Share
$0.48
Cash / Share
$1.09

Ownership Breakdown

85.4%
Float
72.3M
Shares Outstanding
61.8M
Float Shares

Major Holders (11)

Combined: 141.0%

Holders of 5%+ from their latest Schedule 13D/13G filing in the last two years. Percentages are as of each filing date.

HolderType% of ClassSharesFiledFiling
Rajeev ShahHC, IN29.50%21,101,669Mar 17, 202613D/G
RA Capital Management, L.P.IA, PN29.50%21,101,669Mar 17, 202613D/G
Peter KolchinskyHC, IN29.50%21,101,669Mar 17, 202613D/G
RA Capital Healthcare Fund, L.P.Partnership26.80%19,103,785Mar 17, 202613D/G
Sands Capital Alternatives, LLCOther5.60%3,417,075Aug 13, 202513D/G
Sands Frank M.HC, IN5.60%3,417,075Aug 13, 202513D/G
James B. Murray Jr.Individual5.00%3,611,360Apr 7, 202613D/G
Franklin Resources, Inc.HC, CO3.80%2,305,096Nov 4, 202513D/G
Sands Capital Global Venture Fund II, L.P.Partnership1.90%1,146,173Aug 13, 202513D/G
Sands Capital Ventures Discovery Fund III, L.P.Partnership1.90%1,124,729Aug 13, 202513D/G
Sands Capital Life Sciences Pulse Fund, LLCPartnership1.90%1,146,173Aug 13, 202513D/G

Insider Trades (100)

Last 4 quarters: 9,428,924 acquired · 353,880 disposed
InsiderPositionDateTypeSharesPriceValueFiling
Porter DerrelldirectorJun 15, 2026OPTION EX.6,460$1.07$6.9KForm 4
Porter DerrelldirectorJun 17, 2026OPTION EX.13,040$1.07$14.0KForm 4
Porter DerrelldirectorJun 15, 2026SELL6,460$2.35$15.1KForm 4
Porter DerrelldirectorJun 17, 2026SELL13,040$2.33$30.3KForm 4
Porter DerrelldirectorJun 16, 2026SELL12,800$2.33$29.8KForm 4
Porter DerrelldirectorJun 15, 2026OPTION EX.6,460$1.07$6.9KForm 4
Porter DerrelldirectorJun 17, 2026OPTION EX.13,040$1.07$14.0KForm 4
Fountain Nathan BdirectorJun 9, 2026SELL6,400$2.23$14.3KForm 4
RA CAPITAL MANAGEMENT, L.P.director, 10 percent owner: Jun 3, 2026AWARD53,250$2.29$121.9KForm 4
RA CAPITAL MANAGEMENT, L.P.director, 10 percent owner: Jun 3, 2026AWARD35,500——Form 4
Fountain Nathan BdirectorJun 3, 2026AWARD35,500——Form 4
Fountain Nathan BdirectorJun 3, 2026AWARD53,250$2.29$121.9KForm 4
Drapkin Kimberlee CdirectorJun 3, 2026AWARD53,250$2.29$121.9KForm 4
Drapkin Kimberlee CdirectorJun 3, 2026AWARD35,500——Form 4
Stalfort John A IIIdirectorJun 3, 2026AWARD35,500——Form 4
Stalfort John A IIIdirectorJun 3, 2026AWARD53,250$2.29$121.9KForm 4
Porter DerrelldirectorJun 3, 2026AWARD53,250$2.29$121.9KForm 4
Porter DerrelldirectorJun 3, 2026AWARD35,500——Form 4
Ives Jeffrey L.directorJun 3, 2026AWARD53,250$2.29$121.9KForm 4
Ives Jeffrey L.directorJun 3, 2026AWARD35,500——Form 4
Golumbeski GeorgedirectorJun 3, 2026AWARD53,250$2.29$121.9KForm 4
Golumbeski GeorgedirectorJun 3, 2026AWARD35,500——Form 4
Stoppel LauradirectorJun 3, 2026AWARD53,250$2.29$121.9KForm 4
Stoppel LauradirectorJun 3, 2026AWARD35,500——Form 4
RA CAPITAL MANAGEMENT, L.P.director, 10 percent owner: Mar 16, 2026AWARD6,060,606$3.30$20.0MForm 4
Meisner Derek MChief Legal Officer & Corp SecMar 6, 2026OPTION EX.2,090$1.85$3.9KForm 4
Meisner Derek MChief Legal Officer & Corp SecMar 6, 2026SELL2,090$3.26$6.8KForm 4
Meisner Derek MChief Legal Officer & Corp SecMar 6, 2026OPTION EX.2,090$1.85$3.9KForm 4
Meisner Derek MChief Legal Officer & Corp SecFeb 27, 2026OPTION EX.9,406$1.85$17.4KForm 4
Meisner Derek MChief Legal Officer & Corp SecFeb 27, 2026SELL9,406$3.01$28.3KForm 4
Meisner Derek MChief Legal Officer & Corp SecFeb 27, 2026OPTION EX.9,406$1.85$17.4KForm 4
Meisner Derek MChief Legal Officer & Corp SecJan 26, 2026OPTION EX.15,085$1.85$27.9KForm 4
Meisner Derek MChief Legal Officer & Corp SecJan 28, 2026OPTION EX.2,671$1.85$4.9KForm 4
Meisner Derek MChief Legal Officer & Corp SecJan 28, 2026SELL2,671$3.00$8.0KForm 4
Meisner Derek MChief Legal Officer & Corp SecJan 26, 2026SELL15,085$3.00$45.3KForm 4
Meisner Derek MChief Legal Officer & Corp SecJan 26, 2026OPTION EX.15,085$1.85$27.9KForm 4
Meisner Derek MChief Legal Officer & Corp SecJan 28, 2026OPTION EX.2,671$1.85$4.9KForm 4
Meisner Derek MChief Legal Officer & Corp SecJan 21, 2026SELL2,247$1.81$4.1KForm 4
Meisner Derek MChief Legal Officer & Corp SecJan 22, 2026SELL1,054$1.84$1.9KForm 4
Meisner Derek MChief Legal Officer & Corp SecJan 23, 2026SELL5,633$1.90$10.7KForm 4
Siemers EricChief Medical OfficerJan 21, 2026SELL2,331$1.80$4.2KForm 4
Siemers EricChief Medical OfficerJan 22, 2026SELL895$1.82$1.6KForm 4
Zuga MattCFO & Chief Business OfficerJan 21, 2026SELL2,473$1.81$4.5KForm 4
Zuga MattCFO & Chief Business OfficerJan 22, 2026SELL1,687$1.86$3.1KForm 4
OConnell Daniel Josephdirector, officer: Chief Executive OfficerJan 21, 2026SELL9,346$1.81$16.9KForm 4
OConnell Daniel Josephdirector, officer: Chief Executive OfficerJan 22, 2026SELL2,689$1.88$5.1KForm 4
Barton RussellChief Operating OfficerJan 21, 2026SELL2,315$1.81$4.2KForm 4
Barton RussellChief Operating OfficerJan 22, 2026SELL462$1.84$850.08Form 4
OConnell Daniel Josephdirector, officer: Chief Executive OfficerJan 20, 2026AWARD299,800——Form 4
OConnell Daniel Josephdirector, officer: Chief Executive OfficerJan 20, 2026AWARD450,000$1.86$837.0KForm 4
Zuga MattCFO & Chief Business OfficerJan 16, 2026AWARD99,133——Form 4
Zuga MattCFO & Chief Business OfficerJan 16, 2026AWARD148,700$1.89$281.0KForm 4
Meisner Derek MChief Legal Officer & Corp SecJan 16, 2026AWARD99,133——Form 4
Meisner Derek MChief Legal Officer & Corp SecJan 16, 2026AWARD148,700$1.89$281.0KForm 4
Siemers EricChief Medical OfficerJan 16, 2026AWARD99,133——Form 4
Siemers EricChief Medical OfficerJan 16, 2026AWARD148,700$1.89$281.0KForm 4
Barton RussellChief Operating OfficerJan 16, 2026AWARD84,600——Form 4
Barton RussellChief Operating OfficerJan 16, 2026AWARD126,900$1.89$239.8KForm 4
Schacterle AmyChief Regulatory OfficerJan 16, 2026AWARD126,900$1.89$239.8KForm 4
Schacterle AmyChief Regulatory OfficerJan 16, 2026AWARD84,600——Form 4
Doherty James J.President and CDOJan 16, 2026AWARD250,300$1.89$473.1KForm 4
Doherty James J.President and CDOJan 16, 2026AWARD166,867——Form 4
Zuga MattCFO & Chief Business OfficerJan 8, 2026SELL6,888$1.82$12.5KForm 4
Barton RussellChief Operating OfficerJan 8, 2026SELL3,530$1.86$6.6KForm 4
Meisner Derek MChief Legal Officer & Corp SecJan 8, 2026SELL6,819$1.82$12.4KForm 4
Meisner Derek MChief Legal Officer & Corp SecJan 8, 2026SELL30,092$1.82$54.9KForm 4
Meisner Derek MChief Legal Officer & Corp SecJan 9, 2026SELL5,200$1.76$9.2KForm 4
Meisner Derek MChief Legal Officer & Corp SecJan 12, 2026SELL8,548$1.71$14.7KForm 4
OConnell Daniel Josephdirector, officer: Chief Executive OfficerJan 8, 2026SELL8,143$1.82$14.8KForm 4
OConnell Daniel Josephdirector, officer: Chief Executive OfficerJan 9, 2026SELL12,941$1.76$22.8KForm 4
OConnell Daniel Josephdirector, officer: Chief Executive OfficerJan 12, 2026SELL5,388$1.73$9.3KForm 4
Doherty James J.President and CDOJan 7, 2026SELL1,700$1.99$3.4KForm 4
Doherty James J.President and CDOJan 8, 2026SELL6,467$1.82$11.8KForm 4
Schacterle AmyChief Regulatory OfficerJan 7, 2026SELL1,097$1.98$2.2KForm 4
Zuga MattCFO & Chief Business OfficerJan 5, 2026SELL4,000$1.96$7.8KForm 4
Zuga MattCFO & Chief Business OfficerJan 6, 2026SELL5,100$1.97$10.0KForm 4
Zuga MattCFO & Chief Business OfficerJan 7, 2026SELL4,105$2.00$8.2KForm 4
Zuga MattCFO & Chief Business OfficerJan 7, 2026SELL1,700$1.99$3.4KForm 4
Siemers EricChief Medical OfficerJan 5, 2026SELL4,000$1.96$7.8KForm 4
Siemers EricChief Medical OfficerJan 6, 2026SELL6,834$1.97$13.4KForm 4
OConnell Daniel Josephdirector, officer: Chief Executive OfficerJan 5, 2026SELL4,649$1.97$9.2KForm 4
OConnell Daniel Josephdirector, officer: Chief Executive OfficerJan 6, 2026SELL5,102$1.97$10.0KForm 4
OConnell Daniel Josephdirector, officer: Chief Executive OfficerJan 7, 2026SELL37,755$1.99$75.0KForm 4
Meisner Derek MChief Legal Officer & Corp SecJan 5, 2026SELL4,000$1.96$7.8KForm 4
Meisner Derek MChief Legal Officer & Corp SecJan 6, 2026SELL7,097$1.97$14.0KForm 4
Meisner Derek MChief Legal Officer & Corp SecJan 6, 2026SELL3,801$1.97$7.5KForm 4
Meisner Derek MChief Legal Officer & Corp SecJan 7, 2026SELL1,700$1.99$3.4KForm 4
Meisner Derek MChief Legal Officer & Corp SecJan 7, 2026SELL10,070$1.99$20.0KForm 4
Barton RussellChief Operating OfficerJan 5, 2026SELL4,000$1.96$7.8KForm 4
Barton RussellChief Operating OfficerJan 6, 2026SELL3,618$1.97$7.1KForm 4
Barton RussellChief Operating OfficerJan 7, 2026SELL1,700$1.99$3.4KForm 4
Golumbeski GeorgedirectorNov 6, 2025AWARD50,000$1.90$95.0KForm 4
Golumbeski Georgedirector: Nov 6, 2025OTHER0——Form 4
RA CAPITAL MANAGEMENT, L.P.director, 10 percent owner: Jun 4, 2025AWARD19,500$1.07$20.9KForm 4
RA CAPITAL MANAGEMENT, L.P.director, 10 percent owner: Jun 4, 2025AWARD12,800——Form 4
Stoppel LauradirectorJun 4, 2025AWARD19,500$1.07$20.9KForm 4
Stoppel LauradirectorJun 4, 2025AWARD12,800——Form 4
Stalfort John A IIIdirectorJun 4, 2025AWARD12,800——Form 4
Stalfort John A IIIdirectorJun 4, 2025AWARD19,500$1.07$20.9KForm 4
Fountain Nathan BdirectorJun 4, 2025AWARD19,500$1.07$20.9KForm 4