Acumen Pharmaceuticals, Inc.

ABOSNASDAQHealthcare● Active

$2.17

+$0.02(+0.93%)

Market Cap$131444278

P/E Ratio—

52W High$3.6

52W Low$1.05

Avg Volume537K

Open$2.17

Beta0.35

Insider Trades Ownership Employees

Acumen Pharmaceuticals, Inc. (ABOS) Insider Trading

Form 4 buy vs sell counts, ratio, and sentiment — switch this quarter or last 12 months; chart and transactions below.

SEC EDGAR · FMP · ABOS · as of Jun 9, 2026

Activity summary

Buy transactions

P-Purchase only

Sell transactions

12 Months

Buy/Sell ratio

0.00

Buy/Sell (by trades)

Overall sentiment

BEARISH

↑ Buy 0%Active transactions only · RSU vesting excluded100% Sell ↓

Acumen Pharmaceuticals, Inc. insiders have been primarily selling shares over the past 12 Months. Selling activity is often driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment toward the company.

▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · Buy = P-Purchase only · Sell = S-Sale only

As of Jun 9, 2026

ABOS insider buying and selling by quarter

ABOS insider selling · ABOS insider buying stocks · quarterly insider activity

Total insider buying (incl. awards)Total insider selling

8.4M4.2M0

2024 Q1

2024 Q2

2024 Q4

2025 Q1

2025 Q2

2025 Q4

2026 Q1

2026 Q2

Mobile shows last 4Q · Desktop shows full 8Q

▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · last 8 quarters

As of Jun 9, 2026

Active insiders

Most active in past 12 months · ABOS ceo insider trading

Showing all insiders · Click a card to filter the transactions table below

▸ Aggregated from reportingName · top 5 by trade count (12M) · no extra API

Recent insider transactions

ABOS executive sell shares · ABOS board member insider trading · ABOS insider trading SEC filing

Showing 72 most recent · Common Stock · Form 4 only

Scroll horizontally to see all columns

Date	Insider	Type	Shares	Price	Value	After trans.	Filing
Jun 3, 2026	RA CAPITAL MANAGEMENT, L.P. Director	Award	35,500	—	—	48,300	Form 4
Jun 3, 2026	Fountain Nathan B Director	Award	35,500	—	—	54,550	Form 4
Jun 3, 2026	Drapkin Kimberlee C Director	Award	35,500	—	—	48,300	Form 4
Jun 3, 2026	Stalfort John A III Director	Award	35,500	—	—	220,624	Form 4
Jun 3, 2026	Porter Derrell Director	Award	35,500	—	—	48,300	Form 4
Jun 3, 2026	Ives Jeffrey L. Director	Award	35,500	—	—	48,300	Form 4
Jun 3, 2026	Golumbeski George Director	Award	35,500	—	—	35,500	Form 4
Jun 3, 2026	Stoppel Laura Director	Award	35,500	—	—	48,300	Form 4
Mar 16, 2026	RA CAPITAL MANAGEMENT, L.P. Director	Award	6,060,606	$3.30	$20.00M⚡	19,103,785	Form 4
Mar 6, 2026	Meisner Derek M Chief Legal Officer & Corp Sec	Option	2,090	$1.85	$4K	176,089	Form 4
Mar 6, 2026	Meisner Derek M Chief Legal Officer & Corp Sec	Sale	2,090	$3.26	$7K	173,999	Form 4
Feb 27, 2026	Meisner Derek M Chief Legal Officer & Corp Sec	Option	9,406	$1.85	$17K	183,405	Form 4
Feb 27, 2026	Meisner Derek M Chief Legal Officer & Corp Sec	Sale	9,406	$3.01	$28K	173,999	Form 4
Jan 26, 2026	Meisner Derek M Chief Legal Officer & Corp Sec	Option	15,085	$1.85	$28K	189,084	Form 4
Jan 28, 2026	Meisner Derek M Chief Legal Officer & Corp Sec	Option	2,671	$1.85	$5K	176,670	Form 4
Jan 28, 2026	Meisner Derek M Chief Legal Officer & Corp Sec	Sale	2,671	$3.00	$8K	173,999	Form 4
Jan 26, 2026	Meisner Derek M Chief Legal Officer & Corp Sec	Sale	15,085	$3.00	$45K	173,999	Form 4
Jan 21, 2026	Meisner Derek M Chief Legal Officer & Corp Sec	Sale	2,247	$1.81	$4K	180,686	Form 4
Jan 22, 2026	Meisner Derek M Chief Legal Officer & Corp Sec	Sale	1,054	$1.84	$2K	179,632	Form 4
Jan 23, 2026	Meisner Derek M Chief Legal Officer & Corp Sec	Sale	5,633	$1.90	$11K	173,999	Form 4
Jan 21, 2026	Siemers Eric Chief Medical Officer	Sale	2,331	$1.80	$4K	256,266	Form 4
Jan 22, 2026	Siemers Eric Chief Medical Officer	Sale	895	$1.82	$2K	255,371	Form 4
Jan 21, 2026	Zuga Matt CFO & Chief Business Officer	Sale	2,473	$1.81	$4K	306,611	Form 4
Jan 22, 2026	Zuga Matt CFO & Chief Business Officer	Sale	1,687	$1.86	$3K	304,924	Form 4
Jan 21, 2026	OConnell Daniel Joseph CEO · Director	Sale	9,346	$1.81	$17K	883,964	Form 4

RA CAPITAL MANAGEMENT, L.P.

Director

Award

Date

Jun 3

35,500

Price

—

Value

—

View Form 4 on SEC.gov

Fountain Nathan B

Director

Award

Date

Jun 3

35,500

Price

—

Value

—

View Form 4 on SEC.gov

Drapkin Kimberlee C

Director

Award

Date

Jun 3

35,500

Price

—

Value

—

View Form 4 on SEC.gov

Stalfort John A III

Director

Award

Date

Jun 3

35,500

Price

—

Value

—

View Form 4 on SEC.gov

Porter Derrell

Director

Award

Date

Jun 3

35,500

Price

—

Value

—

View Form 4 on SEC.gov

Ives Jeffrey L.

Director

Award

Date

Jun 3

35,500

Price

—

Value

—

View Form 4 on SEC.gov

Golumbeski George

Director

Award

Date

Jun 3

35,500

Price

—

Value

—

View Form 4 on SEC.gov

Stoppel Laura

Director

Award

Date

Jun 3

35,500

Price

—

Value

—

View Form 4 on SEC.gov

RA CAPITAL MANAGEMENT, L.P.

Director

Award

Date

Mar 16

6,060,606

Price

$3.30

Value

$20.00M ⚡

View Form 4 on SEC.gov

Meisner Derek M

Chief Legal Officer & Corp Sec

Option

Date

Mar 6

2,090

Price

$1.85

Value

$4K

View Form 4 on SEC.gov

Meisner Derek M

Chief Legal Officer & Corp Sec

Sale

Date

Mar 6

2,090

Price

$3.26

Value

$7K

View Form 4 on SEC.gov

Meisner Derek M

Chief Legal Officer & Corp Sec

Option

Date

Feb 27

9,406

Price

$1.85

Value

$17K

View Form 4 on SEC.gov

Meisner Derek M

Chief Legal Officer & Corp Sec

Sale

Date

Feb 27

9,406

Price

$3.01

Value

$28K

View Form 4 on SEC.gov

Meisner Derek M

Chief Legal Officer & Corp Sec

Option

Date

Jan 26

15,085

Price

$1.85

Value

$28K

View Form 4 on SEC.gov

Meisner Derek M

Chief Legal Officer & Corp Sec

Option

Date

Jan 28

2,671

Price

$1.85

Value

$5K

View Form 4 on SEC.gov

Meisner Derek M

Chief Legal Officer & Corp Sec

Sale

Date

Jan 28

2,671

Price

$3.00

Value

$8K

View Form 4 on SEC.gov

Meisner Derek M

Chief Legal Officer & Corp Sec

Sale

Date

Jan 26

15,085

Price

$3.00

Value

$45K

View Form 4 on SEC.gov

Meisner Derek M

Chief Legal Officer & Corp Sec

Sale

Date

Jan 21

2,247

Price

$1.81

Value

$4K

View Form 4 on SEC.gov

Meisner Derek M

Chief Legal Officer & Corp Sec

Sale

Date

Jan 22

1,054

Price

$1.84

Value

$2K

View Form 4 on SEC.gov

Meisner Derek M

Chief Legal Officer & Corp Sec

Sale

Date

Jan 23

5,633

Price

$1.90

Value

$11K

View Form 4 on SEC.gov

Siemers Eric

Chief Medical Officer

Sale

Date

Jan 21

2,331

Price

$1.80

Value

$4K

View Form 4 on SEC.gov

Siemers Eric

Chief Medical Officer

Sale

Date

Jan 22

895

Price

$1.82

Value

$2K

View Form 4 on SEC.gov

Zuga Matt

CFO & Chief Business Officer

Sale

Date

Jan 21

2,473

Price

$1.81

Value

$4K

View Form 4 on SEC.gov

Zuga Matt

CFO & Chief Business Officer

Sale

Date

Jan 22

1,687

Price

$1.86

Value

$3K

View Form 4 on SEC.gov

OConnell Daniel Joseph

CEO · Director

Sale

Date

Jan 21

9,346

Price

$1.81

Value

$17K

View Form 4 on SEC.gov

⚡ = value ≥ $1M · Award/Option price shows — · formType=4 · securityName=Common Stock · url → sec.gov/Archives/edgar

1 / 3

▸ Source: SEC EDGAR · Form 4 filings · ⚡ = value ≥ $1M · Award/Option price shows —

About ABOS insider trading

ABOS insider trades

Acumen Pharmaceuticals, Inc. (ABOS) insider trading data is sourced from SEC Form 4 filings submitted by corporate insiders, including Meisner Derek M (Chief Legal Officer & Corp Sec), OConnell Daniel Joseph (CEO · Director), Zuga Matt (CFO & Chief Business Officer). Over the past 12 months, 5 insiders have filed transactions with the SEC. ABOS insiders have been primarily selling, which may reflect pre-scheduled Rule 10b5-1 plan executions.

For Acumen Pharmaceuticals, Inc.'s institutional ownership breakdown and insider ownership percentage, see the Ownership tab → Ownership tab →

Buy/Sell signal logic

acquisitionOrDisposition field:

A = Acquisition (buy) · D = Disposition (sell)

RSU vesting (M-Exempt) excluded from sentiment

Form 4SEC filing required within 2 business days of any insider transaction

10b5-1Pre-scheduled trading plan that allows insiders to sell on autopilot

Open MktDirect purchase or sale on the open market (excludes awards, options)

Ownership SEC filings Financial statements Price history Forecast & ratings Earnings

Frequently asked questions

ABOS insider trading · 5 questions

The insiders of Acumen Pharmaceuticals, Inc. (ABOS) include executives and directors such as Meisner Derek M (Chief Legal Officer & Corp Sec), OConnell Daniel Joseph (CEO · Director), Zuga Matt (CFO & Chief Business Officer), among others. Over the past 12 months, 5 insiders have filed Form 4 transactions with the SEC. Insider transactions are required to be reported within 2 business days of the trade date.

ABOS board member insider tradingwho are ABOS insidersABOS insider rosterAcumen Pharmaceuticals, Inc. executives insider activity

▸ Source: FMP /stable/insider-trading/search · SEC EDGAR Form 3 & 4 · acquisitionOrDisposition A=Buy, D=Sell · RSU vesting (M-Exempt) excluded from sentiment bar · As of Jun 9, 2026