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Acumen Pharmaceuticals, Inc.

ABOS Net buying
CIK 0001576885 #3844 in the set updated 21 Sep 2026
Bought (120 mo)
$99.36M
out of their own pocket, the only kind of buying there is
Sold (120 mo)
$1.28M
$380.66K on a plan · $406.20K straight out of an exercise
Sold at will
$491.56K
42 of 66 sales
Net
+$98.08M
+$98.86M against sales at will

By person

18 insiders · 78 transactions
Insider
Role
Bought
Sold
Net
Holding
Of company
Worth
Change
RA CAPITAL MANAGEMENT, L.P. entity
Director
$70.00M (3)
—
+$70.00M
637,150
0.8810%
$1.48M
—
Hardie Robert D.
10% owner
$17.00M (2)
—
+$17.00M
7,152,312
9.89%
$16.63M
—
Sands Capital Ventures Discovery Fund III, L.P. entity
10% owner
$6.70M (1)
—
+$6.70M
3,417,075
4.73%
$7.94M
—
Manning Paul B
10% owner
$5.00M (1)
—
+$5.00M
657,985
0.9099%
$1.53M
—
Stalfort John A III
Director
$560.00K (1)
—
+$560.00K
352,219
0.4870%
$818.91K
+4,830%
OConnell Daniel Joseph
Chief Executive Officer
—
$323.85K (11)
−$323.85K
881,275
1.22%
$2.05M
+62,005%
Meisner Derek M
Chief Legal Officer & Corp Sec
—
$305.88K (19)
−$305.88K
173,999
0.2406%
$404.55K
—
Ives Jeffrey L.
Director
—
$272.33K (2) scheduled
−$272.33K
48,300
0.0668%
$112.30K
—
Zuga Matt
CFO & Chief Business Officer
—
$146.26K (11) scheduled
−$146.26K
304,924
0.4216%
$708.95K
—
Fountain Nathan B
Director
$100.00K (1)
$14.27K (1)
+$85.73K
48,150
0.0666%
$111.95K
—
Porter Derrell
Director
—
$75.24K (3) scheduled
−$75.24K
35,500
0.0491%
$82.54K
—
Siemers Eric
Chief Medical Officer
—
$63.88K (7) scheduled
−$63.88K
255,371
0.3531%
$593.74K
—
Barton Russell
Chief Operating Officer
—
$59.39K (9)
−$59.39K
205,092
0.2836%
$476.84K
—
Doherty James J.
President and CDO
—
$15.15K (2)
−$15.15K
220,900
0.3055%
$513.59K
—
Schacterle Amy
Chief Regulatory Officer
—
$2.18K (1)
−$2.18K
92,303
0.1276%
$214.60K
—
Drapkin Kimberlee C
Director
—
—
—
48,300
0.0668%
$112.30K
—
Stoppel Laura
Director
—
—
—
48,300
0.0668%
$112.30K
—
Golumbeski George
Director
—
—
—
35,500
0.0491%
$82.54K
—

Individual transactions

78
Insider
Date
Role
Action
Shares
Price
Amount
Porter Derrell
17 Jun 2026
Director
Sold after exercise
13,040
$2.33
$30.32K
Porter Derrell
16 Jun 2026
Director
Sell
12,800
$2.33
$29.77K
Porter Derrell
15 Jun 2026
Director
Sold after exercise
6,460
$2.35
$15.15K
Fountain Nathan B
9 Jun 2026
Director
Sell
6,400
$2.23
$14.27K
Meisner Derek M
6 Mar 2026
Chief Legal Officer & Corp Sec
Sold after exercise
2,090
$3.26
$6.81K
Meisner Derek M
27 Feb 2026
Chief Legal Officer & Corp Sec
Sold after exercise
9,406
$3.01
$28.31K
Meisner Derek M
28 Jan 2026
Chief Legal Officer & Corp Sec
Sold after exercise
2,671
$3.00
$8.02K
Meisner Derek M
26 Jan 2026
Chief Legal Officer & Corp Sec
Sold after exercise
15,085
$3.00
$45.26K
Meisner Derek M
23 Jan 2026
Chief Legal Officer & Corp Sec
Sell
5,633
$1.90
$10.72K
Barton Russell
22 Jan 2026
Chief Operating Officer
Sell
462
$1.84
$850.08
OConnell Daniel Joseph
22 Jan 2026
Chief Executive Officer
Sell
2,689
$1.88
$5.07K
Zuga Matt
22 Jan 2026
CFO & Chief Business Officer
Sell
1,687
$1.86
$3.14K
Siemers Eric
22 Jan 2026
Chief Medical Officer
Sell
895
$1.82
$1.63K
Meisner Derek M
22 Jan 2026
Chief Legal Officer & Corp Sec
Sell
1,054
$1.84
$1.94K
Barton Russell
21 Jan 2026
Chief Operating Officer
Sell
2,315
$1.81
$4.18K
OConnell Daniel Joseph
21 Jan 2026
Chief Executive Officer
Sell
9,346
$1.81
$16.93K
Zuga Matt
21 Jan 2026
CFO & Chief Business Officer
Sell
2,473
$1.81
$4.47K
Siemers Eric
21 Jan 2026
Chief Medical Officer
Sell
2,331
$1.80
$4.20K
Meisner Derek M
21 Jan 2026
Chief Legal Officer & Corp Sec
Sell
2,247
$1.81
$4.06K
OConnell Daniel Joseph
12 Jan 2026
Chief Executive Officer
Sell
5,388
$1.73
$9.31K
Meisner Derek M
12 Jan 2026
Chief Legal Officer & Corp Sec
Sell
8,548
$1.71
$14.66K
OConnell Daniel Joseph
9 Jan 2026
Chief Executive Officer
Sell
12,941
$1.76
$22.83K
Meisner Derek M
9 Jan 2026
Chief Legal Officer & Corp Sec
Sell
5,200
$1.76
$9.17K
Doherty James J.
8 Jan 2026
President and CDO
Sell
6,467
$1.82
$11.77K
OConnell Daniel Joseph
8 Jan 2026
Chief Executive Officer
Sell
8,143
$1.82
$14.82K
Meisner Derek M
8 Jan 2026
Chief Legal Officer & Corp Sec
Sell
30,092
$1.82
$54.87K
Meisner Derek M
8 Jan 2026
Chief Legal Officer & Corp Sec
Sell
6,819
$1.82
$12.38K
Barton Russell
8 Jan 2026
Chief Operating Officer
Sell
3,530
$1.86
$6.56K
Zuga Matt
8 Jan 2026
CFO & Chief Business Officer
Sell
6,888
$1.82
$12.51K
Barton Russell
7 Jan 2026
Chief Operating Officer
Sell
1,700
$1.99
$3.38K
Meisner Derek M
7 Jan 2026
Chief Legal Officer & Corp Sec
Sell
10,070
$1.99
$20.04K
Meisner Derek M
7 Jan 2026
Chief Legal Officer & Corp Sec
Sell
1,700
$1.99
$3.38K
OConnell Daniel Joseph
7 Jan 2026
Chief Executive Officer
Sell
37,755
$1.99
$74.98K
Zuga Matt
7 Jan 2026
CFO & Chief Business Officer
Sell
1,700
$1.99
$3.38K
Zuga Matt
7 Jan 2026
CFO & Chief Business Officer
Sell
4,105
$2.00
$8.19K
Schacterle Amy
7 Jan 2026
Chief Regulatory Officer
Sell
1,097
$1.98
$2.18K
Doherty James J.
7 Jan 2026
President and CDO
Sell
1,700
$1.99
$3.38K
Barton Russell
6 Jan 2026
Chief Operating Officer
Sell
3,618
$1.97
$7.11K
Meisner Derek M
6 Jan 2026
Chief Legal Officer & Corp Sec
Sell
3,801
$1.97
$7.48K
Meisner Derek M
6 Jan 2026
Chief Legal Officer & Corp Sec
Sell
7,097
$1.97
$13.96K
OConnell Daniel Joseph
6 Jan 2026
Chief Executive Officer
Sell
5,102
$1.97
$10.03K
Siemers Eric
6 Jan 2026
Chief Medical Officer
Sell
6,834
$1.97
$13.44K
Zuga Matt
6 Jan 2026
CFO & Chief Business Officer
Sell
5,100
$1.97
$10.03K
Barton Russell
5 Jan 2026
Chief Operating Officer
Sell
4,000
$1.96
$7.83K
Meisner Derek M
5 Jan 2026
Chief Legal Officer & Corp Sec
Sell
4,000
$1.96
$7.84K
OConnell Daniel Joseph
5 Jan 2026
Chief Executive Officer
Sell
4,649
$1.97
$9.16K
Siemers Eric
5 Jan 2026
Chief Medical Officer
Sell
4,000
$1.96
$7.83K
Zuga Matt
5 Jan 2026
CFO & Chief Business Officer
Sell
4,000
$1.96
$7.84K
Zuga Matt
23 Jan 2025
CFO & Chief Business Officer
Sold on a plan
28,902
$1.72
$49.63K
Siemers Eric
21 Jan 2025
Chief Medical Officer
Sold on a plan
3,219
$1.59
$5.12K
Barton Russell
21 Jan 2025
Chief Operating Officer
Sold on a plan
2,914
$1.61
$4.69K
Meisner Derek M
21 Jan 2025
Chief Legal Officer & Corp Sec
Sold on a plan
3,418
$1.59
$5.43K
OConnell Daniel Joseph
21 Jan 2025
Chief Executive Officer
Sold on a plan
12,619
$1.59
$20.10K
Zuga Matt
21 Jan 2025
CFO & Chief Business Officer
Sold on a plan
4,364
$1.60
$6.99K
Siemers Eric
3 Jan 2025
Chief Medical Officer
Sold on a plan
10,859
$1.85
$20.05K
Zuga Matt
3 Jan 2025
CFO & Chief Business Officer
Sold on a plan
13,235
$1.84
$24.37K
Barton Russell
3 Jan 2025
Chief Operating Officer
Sold on a plan
7,636
$1.86
$14.23K
Meisner Derek M
3 Jan 2025
Chief Legal Officer & Corp Sec
Sold on a plan
11,122
$1.84
$20.51K
OConnell Daniel Joseph
3 Jan 2025
Chief Executive Officer
Sold on a plan
47,778
$1.84
$87.87K
Meisner Derek M
19 Jan 2024
Chief Legal Officer & Corp Sec
Sold on a plan
8,933
$3.48
$31.05K
OConnell Daniel Joseph
19 Jan 2024
President and CEO
Sold on a plan
15,200
$3.47
$52.75K
Barton Russell
18 Jan 2024
Chief Operating Officer
Sold on a plan
2,833
$3.73
$10.56K
Siemers Eric
18 Jan 2024
Chief Medical Officer
Sold on a plan
3,124
$3.71
$11.60K
Zuga Matt
18 Jan 2024
CFO & Chief Business Officer
Sold on a plan
4,242
$3.71
$15.72K
Ives Jeffrey L.
17 Aug 2023
Director
Sold after exercise
2,800
$6.66
$18.65K
Ives Jeffrey L.
17 Aug 2023
Director
Sold after exercise
39,149
$6.48
$253.69K
RA CAPITAL MANAGEMENT, L.P.
21 Jul 2023
Director
Buy indirect
5,161,290
$7.75
$40.00M
Zuga Matt
29 Dec 2022
CFO and Chief Business Officer
Exercised, kept
50,000
$1.19
$59.50K
OConnell Daniel Joseph
30 Nov 2021
President and CEO
Exercised, kept
1,118
$4.47
$5.00K
RA CAPITAL MANAGEMENT, L.P.
6 Jul 2021
Director
Buy indirect
115,668
$16.00
$1.85M
RA CAPITAL MANAGEMENT, L.P.
6 Jul 2021
Director
Buy indirect
1,759,332
$16.00
$28.15M
Sands Capital Ventures Discovery Fund III, L.P.
6 Jul 2021
10% owner
Buy
450,000
$14.88
$6.70M
Fountain Nathan B
6 Jul 2021
Director
Buy
6,250
$16.00
$100.00K
Hardie Robert D.
6 Jul 2021
10% owner
Buy indirect
750,000
$16.00
$12.00M
Hardie Robert D.
6 Jul 2021
10% owner
Buy indirect
312,500
$16.00
$5.00M
OConnell Daniel Joseph
6 Jul 2021
President and CEO
Exercised, kept
35
$4.47
$156.45
Stalfort John A III
6 Jul 2021
Director
Buy
35,000
$16.00
$560.00K
Manning Paul B
6 Jul 2021
10% owner
Buy indirect
312,500
$16.00
$5.00M

What was left out

Form 4 filings counted 120
Amendments (4/A) skipped 0
Filings about a different issuer 0
Unreadable filings 0
Joint filings 9
Sales on a Rule 10b5-1 plan 16
Sales straight out of an exercise 8
Sales at will 42
Transactions with no price 0
Shares from compensation/vesting 30,618,063
History held since 2 Jul 2021