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United States Biotechnology & Medical Research

Acumen Pharmaceuticals Inc (ABOS)

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Over the last 90 days, Acumen Pharmaceuticals Inc. has seen net insider selling totaling $895,121.4. There were 8 transactions, all of which were sales. Notably, Director Derrell Porter and Director Nathan Fountain have made significant sales. The company's stock has experienced a 15.7% decrease in the past 90 days.
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Ticker: ABOS Exchange: NSM
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Activity signal Earnings
Top insiders
Trades
Porter Derrell
1 sale — total 100,000 USD
Sale 17 Jun 2026
Value US$279,699.24 | Price 55.94 | Shares 67,582
Proposed sale 17 Jun 2026
Value US$2,461,263.20 | Price 205.27 | Shares 29,760
Sale 16 Jun 2026
Value US$100,000.00 | Price 2.33 | Shares 1,000
Proposed sale 16 Jun 2026
Value US$100,000.00 | Price 2.33 | Shares 1,000
Sale 15 Jun 2026
Value US$100,000.00 | Price 2.35 | Shares 1,000
Proposed sale 15 Jun 2026
Value US$100,000.00 | Price 2.35 | Shares 1,000
Sale 9 Jun 2026
Value US$100,000.00 | Price 2.23 | Shares 1,000
Proposed sale 9 Jun 2026
Value US$100,000.00 | Price 2.23 | Shares 1,000
Planned sale 6 Mar 2026
Value US$6,813.40 | Price 3.26 | Shares 2,090
Proposed sale 6 Mar 2026
Value US$6,729.80 | Price 3.22 | Shares 2,090
Planned sale 27 Feb 2026
Value US$28,311.12 | Price 3.01 | Shares 9,406
Proposed sale 27 Feb 2026
Value US$28,310.82 | Price 3.01 | Shares 9,406
Proposed sale 28 Jan 2026
Value US$8,017.29 | Price 3.00 | Shares 2,671
Planned sale 28 Jan 2026
Value US$8,017.27 | Price 3.00 | Shares 2,671
Proposed sale 27 Jan 2026
Value US$45,262.48 | Price 3.00 | Shares 15,085
Planned sale 26 Jan 2026
Value US$45,262.54 | Price 3.00 | Shares 15,085
Proposed sale 23 Jan 2026
Value US$10,492.83 | Price 1.86 | Shares 5,633
Planned sale 23 Jan 2026
Value US$10,717.91 | Price 1.90 | Shares 5,633
Planned sale 22 Jan 2026
Value US$5,065.54 | Price 1.88 | Shares 2,689
Proposed sale 22 Jan 2026
Value US$5,065.60 | Price 1.88 | Shares 2,689
Planned sale 22 Jan 2026
Value US$1,628.90 | Price 1.82 | Shares 895
Proposed sale 22 Jan 2026
Value US$1,628.90 | Price 1.82 | Shares 895
Planned sale 22 Jan 2026
Value US$1,939.36 | Price 1.84 | Shares 1,054
Proposed sale 22 Jan 2026
Value US$1,939.36 | Price 1.84 | Shares 1,054
Planned sale 22 Jan 2026
Value US$850.08 | Price 1.84 | Shares 462
Proposed sale 22 Jan 2026
Value US$850.08 | Price 1.84 | Shares 462
Planned sale 22 Jan 2026
Value US$3,137.82 | Price 1.86 | Shares 1,687
Proposed sale 22 Jan 2026
Value US$3,137.82 | Price 1.86 | Shares 1,687
Planned sale 21 Jan 2026
Value US$16,927.48 | Price 1.81 | Shares 9,346
Proposed sale 21 Jan 2026
Value US$16,927.34 | Price 1.81 | Shares 9,346
Planned sale 21 Jan 2026
Value US$4,203.96 | Price 1.80 | Shares 2,331
Proposed sale 21 Jan 2026
Value US$4,203.85 | Price 1.80 | Shares 2,331
Planned sale 21 Jan 2026
Value US$4,063.25 | Price 1.81 | Shares 2,247
Proposed sale 21 Jan 2026
Value US$4,063.33 | Price 1.81 | Shares 2,247
Planned sale 21 Jan 2026
Value US$4,180.89 | Price 1.81 | Shares 2,315
Proposed sale 21 Jan 2026
Value US$4,180.88 | Price 1.81 | Shares 2,315
Planned sale 21 Jan 2026
Value US$4,469.21 | Price 1.81 | Shares 2,473
Proposed sale 21 Jan 2026
Value US$4,469.18 | Price 1.81 | Shares 2,473
Proposed sale 12 Jan 2026
Value US$14,658.02 | Price 1.71 | Shares 8,548
Planned sale 12 Jan 2026
Value US$14,658.11 | Price 1.71 | Shares 8,548
Proposed sale 12 Jan 2026
Value US$9,306.56 | Price 1.73 | Shares 5,388
Planned sale 12 Jan 2026
Value US$9,306.69 | Price 1.73 | Shares 5,388
Planned sale 9 Jan 2026
Value US$22,831.81 | Price 1.76 | Shares 12,941
Proposed sale 9 Jan 2026
Value US$22,832.18 | Price 1.76 | Shares 12,941
Planned sale 9 Jan 2026
Value US$9,169.16 | Price 1.76 | Shares 5,200
Proposed sale 9 Jan 2026
Value US$9,169.00 | Price 1.76 | Shares 5,200
Planned sale 8 Jan 2026
Value US$14,815.37 | Price 1.82 | Shares 8,143
Proposed sale 8 Jan 2026
Value US$14,815.32 | Price 1.82 | Shares 8,143
Planned sale 8 Jan 2026
Value US$6,561.56 | Price 1.86 | Shares 3,530
Proposed sale 8 Jan 2026
Value US$6,561.55 | Price 1.86 | Shares 3,530
Planned sale 8 Jan 2026
Value US$54,866.74 | Price 1.82 | Shares 30,092
Planned sale 8 Jan 2026
Value US$12,379.21 | Price 1.82 | Shares 6,819
Proposed sale 8 Jan 2026
Value US$67,244.23 | Price 1.82 | Shares 36,911
Planned sale 8 Jan 2026
Value US$12,512.74 | Price 1.82 | Shares 6,888
Proposed sale 8 Jan 2026
Value US$12,513.07 | Price 1.82 | Shares 6,888
Planned sale 8 Jan 2026
Value US$11,768.65 | Price 1.82 | Shares 6,467
Proposed sale 8 Jan 2026
Value US$11,768.71 | Price 1.82 | Shares 6,467
Planned sale 7 Jan 2026
Value US$2,176.23 | Price 1.98 | Shares 1,097
Proposed sale 7 Jan 2026
Value US$2,176.24 | Price 1.98 | Shares 1,097
Planned sale 7 Jan 2026
Value US$3,379.43 | Price 1.99 | Shares 1,700
Proposed sale 7 Jan 2026
Value US$3,379.50 | Price 1.99 | Shares 1,700
Proposed sale 7 Jan 2026
Value US$23,414.63 | Price 1.99 | Shares 11,770
Planned sale 7 Jan 2026
Value US$20,035.27 | Price 1.99 | Shares 10,070
Planned sale 7 Jan 2026
Value US$3,378.92 | Price 1.99 | Shares 1,700
Proposed sale 7 Jan 2026
Value US$3,378.00 | Price 1.99 | Shares 1,700
Planned sale 7 Jan 2026
Value US$3,378.07 | Price 1.99 | Shares 1,700
Proposed sale 7 Jan 2026
Value US$11,565.85 | Price 1.99 | Shares 5,805
Planned sale 7 Jan 2026
Value US$3,376.54 | Price 1.99 | Shares 1,700
Planned sale 7 Jan 2026
Value US$8,189.48 | Price 2.00 | Shares 4,105
Proposed sale 7 Jan 2026
Value US$74,980.95 | Price 1.99 | Shares 37,755
Planned sale 7 Jan 2026
Value US$74,981.43 | Price 1.99 | Shares 37,755
Planned sale 6 Jan 2026
Value US$10,027.62 | Price 1.97 | Shares 5,100
Planned sale 6 Jan 2026
Value US$7,114.44 | Price 1.97 | Shares 3,618
Planned sale 6 Jan 2026
Value US$13,442.48 | Price 1.97 | Shares 6,834
Planned sale 6 Jan 2026
Value US$10,031.55 | Price 1.97 | Shares 5,102
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2026-06-17 2026-06-17 S Sale
Porter Derrell
Non-Executive Director
67,582 +9.0%
55.94
US$279,699 		67,582 +9.0% 55.94 US$279,699
2026-06-17 2026-06-17 PrS Proposed sale
DERRELL PORTER

Director

Non-Executive Director
29,760
205.27
US$2,461,263 		29,760 205.27 US$2,461,263
2026-06-17 2026-06-16 S Sale
Porter Derrell
Non-Executive Director
45,821 +5.7%
217.76
US$1,537,833 		45,821 +5.7% 217.76 US$1,537,833
2026-06-16 2026-06-16 PrS Proposed sale
DERRELL PORTER

Director

Non-Executive Director
1,000
2.33
US$100,000 		1,000 2.33 US$100,000
2026-06-17 2026-06-15 S Sale
Porter Derrell
Non-Executive Director
1,000 -11.8%
2.35
US$100,000 		1,000 -11.8% 2.35 US$100,000
2026-06-15 2026-06-15 PrS Proposed sale
DERRELL PORTER

Director

Non-Executive Director
1,000
2.35
US$100,000 		1,000 2.35 US$100,000
2026-06-10 2026-06-09 S Sale
Fountain Nathan B
Non-Executive Director
1,000 -11.7%
2.23
US$100,000 		1,000 -11.7% 2.23 US$100,000
2026-06-09 2026-06-09 PrS Proposed sale
NATHAN FOUNTAIN

Director

Non-Executive Director
1,000
2.23
US$100,000 		1,000 2.23 US$100,000
2026-03-10 2026-03-06 PlS Planned sale
Meisner Derek M

Chief Legal Officer & Corp Sec

Officer
2,090 -1.2%
3.26
US$6,813 		2,090 -1.2% 3.26 US$6,813
2026-03-06 2026-03-06 PrS Proposed sale
Meisner Derek M

Officer

Officer
2,090
3.22
US$6,730 		2,090 3.22 US$6,730
2026-03-03 2026-02-27 PlS Planned sale
Meisner Derek M

Chief Legal Officer & Corp Sec

Officer
9,406 -5.1%
3.01
US$28,311 		9,406 -5.1% 3.01 US$28,311
2026-02-27 2026-02-27 PrS Proposed sale
Meisner Derek M

Officer

Officer
9,406
3.01
US$28,311 		9,406 3.01 US$28,311
2026-01-28 2026-01-28 PrS Proposed sale
Meisner Derek M

Officer

Officer
2,671
3.00
US$8,017 		2,671 3.00 US$8,017
2026-01-28 2026-01-28 PlS Planned sale
Meisner Derek M

Chief Legal Officer & Corp Sec

Officer
2,671 -1.5%
3.00
US$8,017 		2,671 -1.5% 3.00 US$8,017
2026-01-26 2026-01-27 PrS Proposed sale
Meisner Derek M

Officer

Officer
15,085
3.00
US$45,262 		15,085 3.00 US$45,262
2026-01-28 2026-01-26 PlS Planned sale
Meisner Derek M

Chief Legal Officer & Corp Sec

Officer
15,085 -8.0%
3.00
US$45,263 		15,085 -8.0% 3.00 US$45,263
2026-01-23 2026-01-23 PrS Proposed sale
Meisner Derek M

Officer

Officer
5,633
1.86
US$10,493 		5,633 1.86 US$10,493
2026-01-23 2026-01-23 PlS Planned sale
Meisner Derek M

Chief Legal Officer & Corp Sec

Officer
5,633 -3.1%
1.90
US$10,718 		5,633 -3.1% 1.90 US$10,718
2026-01-23 2026-01-22 PlS Planned sale
OConnell Daniel Joseph

Chief Executive Officer

Executive Director
2,689 -0.3%
1.88
US$5,066 		2,689 -0.3% 1.88 US$5,066
2026-01-23 2026-01-22 PlS Planned sale
Siemers Eric

Chief Medical Officer

Officer
895 -0.3%
1.82
US$1,629 		895 -0.3% 1.82 US$1,629
2026-01-23 2026-01-22 PlS Planned sale
Meisner Derek M

Chief Legal Officer & Corp Sec

Officer
1,054 -0.6%
1.84
US$1,939 		1,054 -0.6% 1.84 US$1,939
2026-01-23 2026-01-22 PlS Planned sale
Barton Russell

Chief Operating Officer

Officer
462 -0.2%
1.84
US$850 		462 -0.2% 1.84 US$850
2026-01-23 2026-01-22 PlS Planned sale
Zuga Matt

CFO & Chief Business Officer

Officer
1,687 -0.6%
1.86
US$3,138 		1,687 -0.6% 1.86 US$3,138
2026-01-22 2026-01-22 PrS Proposed sale
Meisner Derek M

Officer

Officer
1,054
1.84
US$1,939 		1,054 1.84 US$1,939
2026-01-22 2026-01-22 PrS Proposed sale
Siemers Eric

Officer

Officer
895
1.82
US$1,629 		895 1.82 US$1,629
2026-01-22 2026-01-22 PrS Proposed sale
Barton Russell

Officer

Officer
462
1.84
US$850 		462 1.84 US$850
2026-01-22 2026-01-22 PrS Proposed sale
Zuga Matt

Officer

Officer
1,687
1.86
US$3,138 		1,687 1.86 US$3,138
2026-01-22 2026-01-22 PrS Proposed sale
OConnell Daniel Joseph

Officer; Director

Executive Director
2,689
1.88
US$5,066 		2,689 1.88 US$5,066
2026-01-23 2026-01-21 PlS Planned sale
OConnell Daniel Joseph

Chief Executive Officer

Executive Director
9,346 -1.0%
1.81
US$16,927 		9,346 -1.0% 1.81 US$16,927
2026-01-23 2026-01-21 PlS Planned sale
Siemers Eric

Chief Medical Officer

Officer
2,331 -0.9%
1.80
US$4,204 		2,331 -0.9% 1.80 US$4,204
2026-01-23 2026-01-21 PlS Planned sale
Meisner Derek M

Chief Legal Officer & Corp Sec

Officer
2,247 -1.2%
1.81
US$4,063 		2,247 -1.2% 1.81 US$4,063
2026-01-23 2026-01-21 PlS Planned sale
Barton Russell

Chief Operating Officer

Officer
2,315 -1.1%
1.81
US$4,181 		2,315 -1.1% 1.81 US$4,181
2026-01-23 2026-01-21 PlS Planned sale
Zuga Matt

CFO & Chief Business Officer

Officer
2,473 -0.8%
1.81
US$4,469 		2,473 -0.8% 1.81 US$4,469
2026-01-21 2026-01-21 PrS Proposed sale
Meisner Derek M

Officer

Officer
2,247
1.81
US$4,063 		2,247 1.81 US$4,063
2026-01-21 2026-01-21 PrS Proposed sale
Siemers Eric

Officer

Officer
2,331
1.80
US$4,204 		2,331 1.80 US$4,204
2026-01-21 2026-01-21 PrS Proposed sale
Barton Russell

Officer

Officer
2,315
1.81
US$4,181 		2,315 1.81 US$4,181
2026-01-21 2026-01-21 PrS Proposed sale
Zuga Matt

Officer

Officer
2,473
1.81
US$4,469 		2,473 1.81 US$4,469
2026-01-21 2026-01-21 PrS Proposed sale
OConnell Daniel Joseph

Officer; Director

Executive Director
9,346
1.81
US$16,927 		9,346 1.81 US$16,927
2026-01-12 2026-01-12 PrS Proposed sale
Meisner Derek M

Officer

Officer
8,548
1.71
US$14,658 		8,548 1.71 US$14,658
2026-01-12 2026-01-12 PrS Proposed sale
OConnell Daniel Joseph

Officer; Director

Executive Director
5,388
1.73
US$9,307 		5,388 1.73 US$9,307
2026-01-12 2026-01-12 PlS Planned sale
OConnell Daniel Joseph

Chief Executive Officer

Executive Director
5,388 -0.9%
1.73
US$9,307 		5,388 -0.9% 1.73 US$9,307
2026-01-12 2026-01-12 PlS Planned sale
Meisner Derek M

Chief Legal Officer & Corp Sec

Officer
8,548 -9.3%
1.71
US$14,658 		8,548 -9.3% 1.71 US$14,658
2026-01-12 2026-01-09 PlS Planned sale
OConnell Daniel Joseph

Chief Executive Officer

Executive Director
12,941 -2.1%
1.76
US$22,832 		12,941 -2.1% 1.76 US$22,832
2026-01-12 2026-01-09 PlS Planned sale
Meisner Derek M

Chief Legal Officer & Corp Sec

Officer
5,200 -5.3%
1.76
US$9,169 		5,200 -5.3% 1.76 US$9,169
2026-01-09 2026-01-09 PrS Proposed sale
Meisner Derek M

Officer

Officer
5,200
1.76
US$9,169 		5,200 1.76 US$9,169
2026-01-09 2026-01-09 PrS Proposed sale
OConnell Daniel Joseph

Officer; Director

Executive Director
12,941
1.76
US$22,832 		12,941 1.76 US$22,832
2026-01-12 2026-01-08 PlS Planned sale
OConnell Daniel Joseph

Chief Executive Officer

Executive Director
8,143 -1.3%
1.82
US$14,815 		8,143 -1.3% 1.82 US$14,815
2026-01-12 2026-01-08 PlS Planned sale
Barton Russell

Chief Operating Officer

Officer
3,530 -2.8%
1.86
US$6,562 		3,530 -2.8% 1.86 US$6,562
2026-01-12 2026-01-08 PlS Planned sale
Meisner Derek M

Chief Legal Officer & Corp Sec

Officer
30,092 -23.6%
1.82
US$54,867 		30,092 -23.6% 1.82 US$54,867
2026-01-12 2026-01-08 PlS Planned sale
Meisner Derek M

Chief Legal Officer & Corp Sec

Officer
6,819 -5.1%
1.82
US$12,379 		6,819 -5.1% 1.82 US$12,379
2026-01-12 2026-01-08 PlS Planned sale
Zuga Matt

CFO & Chief Business Officer

Officer
6,888 -3.2%
1.82
US$12,513 		6,888 -3.2% 1.82 US$12,513
2026-01-09 2026-01-08 PlS Planned sale
Doherty James J.

President and CDO

Officer
6,467 -10.7%
1.82
US$11,769 		6,467 -10.7% 1.82 US$11,769
2026-01-08 2026-01-08 PrS Proposed sale
Doherty James J.

Officer

Officer
6,467
1.82
US$11,769 		6,467 1.82 US$11,769
2026-01-08 2026-01-08 PrS Proposed sale
Meisner Derek M

Officer

Officer
36,911
1.82
US$67,244 		36,911 1.82 US$67,244
2026-01-08 2026-01-08 PrS Proposed sale
Barton Russell

Officer

Officer
3,530
1.86
US$6,562 		3,530 1.86 US$6,562
2026-01-08 2026-01-08 PrS Proposed sale
Zuga Matt

Officer

Officer
6,888
1.82
US$12,513 		6,888 1.82 US$12,513
2026-01-08 2026-01-08 PrS Proposed sale
OConnell Daniel Joseph

Officer; Director

Executive Director
8,143
1.82
US$14,815 		8,143 1.82 US$14,815
2026-01-09 2026-01-07 PlS Planned sale
Schacterle Amy

Chief Regulatory Officer

Officer
1,097 -12.5%
1.98
US$2,176 		1,097 -12.5% 1.98 US$2,176
2026-01-09 2026-01-07 PlS Planned sale
Doherty James J.

President and CDO

Officer
1,700 -2.7%
1.99
US$3,379 		1,700 -2.7% 1.99 US$3,379
2026-01-07 2026-01-07 PrS Proposed sale
Schacterle Amy

Officer

Officer
1,097
1.98
US$2,176 		1,097 1.98 US$2,176
2026-01-07 2026-01-07 PrS Proposed sale
Doherty James J.

Officer

Officer
1,700
1.99
US$3,380 		1,700 1.99 US$3,380
2026-01-07 2026-01-07 PrS Proposed sale
Meisner Derek M

Officer

Officer
11,770
1.99
US$23,415 		11,770 1.99 US$23,415
2026-01-07 2026-01-07 PrS Proposed sale
Barton Russell

Officer

Officer
1,700
1.99
US$3,378 		1,700 1.99 US$3,378
2026-01-07 2026-01-07 PrS Proposed sale
Zuga Matt

Officer

Officer
5,805
1.99
US$11,566 		5,805 1.99 US$11,566
2026-01-07 2026-01-07 PrS Proposed sale
OConnell Daniel Joseph

Officer; Director

Executive Director
37,755
1.99
US$74,981 		37,755 1.99 US$74,981
2026-01-07 2026-01-07 PlS Planned sale
Zuga Matt

CFO & Chief Business Officer

Officer
1,700 -0.8%
1.99
US$3,377 		1,700 -0.8% 1.99 US$3,377
2026-01-07 2026-01-07 PlS Planned sale
Zuga Matt

CFO & Chief Business Officer

Officer
4,105 -1.8%
2.00
US$8,189 		4,105 -1.8% 2.00 US$8,189
2026-01-07 2026-01-07 PlS Planned sale
Barton Russell

Chief Operating Officer

Officer
1,700 -1.3%
1.99
US$3,378 		1,700 -1.3% 1.99 US$3,378
2026-01-07 2026-01-07 PlS Planned sale
OConnell Daniel Joseph

Chief Executive Officer

Executive Director
37,755 -5.7%
1.99
US$74,981 		37,755 -5.7% 1.99 US$74,981
2026-01-07 2026-01-07 PlS Planned sale
Meisner Derek M

Chief Legal Officer & Corp Sec

Officer
10,070 -7.0%
1.99
US$20,035 		10,070 -7.0% 1.99 US$20,035
2026-01-07 2026-01-07 PlS Planned sale
Meisner Derek M

Chief Legal Officer & Corp Sec

Officer
1,700 -1.2%
1.99
US$3,379 		1,700 -1.2% 1.99 US$3,379
2026-01-07 2026-01-06 PlS Planned sale
Zuga Matt

CFO & Chief Business Officer

Officer
5,100 -2.2%
1.97
US$10,028 		5,100 -2.2% 1.97 US$10,028
2026-01-07 2026-01-06 PlS Planned sale
Barton Russell

Chief Operating Officer

Officer
3,618 -2.7%
1.97
US$7,114 		3,618 -2.7% 1.97 US$7,114
2026-01-07 2026-01-06 PlS Planned sale
Siemers Eric

Chief Medical Officer

Officer
6,834 -4.1%
1.97
US$13,442 		6,834 -4.1% 1.97 US$13,442
2026-01-07 2026-01-06 PlS Planned sale
OConnell Daniel Joseph

Chief Executive Officer

Executive Director
5,102 -0.8%
1.97
US$10,032 		5,102 -0.8% 1.97 US$10,032
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