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The company

Acumen Pharmaceuticals, Inc.

ABOS · Nasdaq

Health CareBiotechnologyNot moving yet

ABOS stood above a rising 150-day average in 40 of the last 52 weekly readings, and has been out of that trend for the last 5 weeks. It is 28.8% below that average now. Biotechnology: 16% of its 561 stocks in an uptrend (−15 points in four weeks); Health Care: 26% (−10 points in four weeks).

SEC filings

Statistics

Rotation: Not moving yet
Weeks in an uptrend: out for 5
Industry in uptrend: 16% -15 in 4 wk
Insider buys, 12 months: $0
Insider sales, 12 months: $1.3M
Officials’ trades on record: 0
Institutions holding: 94 (+15)

In the rotation

Each square a week: lit when it closed above a rising 150-day average. 40 of 52 weeks.

20 Apr – 19 Oct

Biotechnology: Few of its stocks are in an uptrend and the share has fallen sharply over four weeks. Health Care: A minority of its stocks are in an uptrend and the share has fallen sharply over four weeks.

Money in and out

1 Nov 2024 – 1 Oct 2026

Open-market buys above the line and sales below, in dollars.

Congress and officials

No member of Congress or official has disclosed a trade in it.

Insiders

Buy orders, 12 months0

Sale orders, 12 months44

Buyers · sellers0 · 9

Who	Did	Shares	Traded
Derrell PorterDirector	sold	13,040at $2.33	17 Jun 2026filed 17 Jun 2026
Derrell PorterDirector	sold	12,800at $2.33	16 Jun 2026filed 17 Jun 2026
Derrell PorterDirector	sold	6,460at $2.35	15 Jun 2026filed 17 Jun 2026
Nathan B. FountainDirector	sold	6,400at $2.23	9 Jun 2026filed 10 Jun 2026
Derek M. MeisnerChief Legal Officer & Corp Sec	sold	2,090at $3.26	6 Mar 2026filed 10 Mar 2026
Derek M. MeisnerChief Legal Officer & Corp Sec	sold	9,406at $3.01	27 Feb 2026filed 3 Mar 2026
Derek M. MeisnerChief Legal Officer & Corp Sec	sold	2,671at $3.00	28 Jan 2026filed 28 Jan 2026
Derek M. MeisnerChief Legal Officer & Corp Sec	sold	15,085at $3.00	26 Jan 2026filed 28 Jan 2026
Derek M. MeisnerChief Legal Officer & Corp Sec	sold	5,633at $1.90	23 Jan 2026filed 23 Jan 2026
Russell BartonChief Operating Officer	sold	462at $1.84	22 Jan 2026filed 23 Jan 2026
Daniel Joseph OconnellChief Executive Officer	sold	2,689at $1.88	22 Jan 2026filed 23 Jan 2026
Matt ZugaCFO & Chief Business Officer	sold	1,687at $1.86	22 Jan 2026filed 23 Jan 2026

Lines filed since 2 January 2026, newest first; every insider’s older lines are on their own page.

Institutions

Holders94+15 on the quarter

New · exited30 · 16

Reported value$127.2M

Quarter to 30 Jun 2026, against 31 Mar 2026; newest filing 31 Aug 2026.

Manager	Shares	Change
RA CAPITAL MANAGEMENT, L.P.unchanged · filed 14 Aug 2026	20,992,669$56.1M	00.0%
Sands Capital Alternatives, LLCunchanged · filed 13 Aug 2026	3,720,105$9.9M	00.0%
BlackRock, Inc.added · filed 7 Aug 2026	2,490,115$6.6M	+2,311,789+1296.4%
Alyeska Investment Group, L.P.unchanged · filed 14 Aug 2026	2,454,754$6.6M	00.0%
FRANKLIN RESOURCES INCunchanged · filed 13 Aug 2026	2,305,096$6.2M	00.0%
ADAR1 Capital Management, LLCreduced · filed 14 Aug 2026	2,111,334$5.6M	-45,000−2.1%
VANGUARD CAPITAL MANAGEMENT LLCadded · filed 13 Aug 2026	1,672,072$4.5M	+165,795+11.0%
Knollwood Investment Advisory, LLCunchanged · filed 13 Aug 2026	1,628,510$4.3M	00.0%
GEODE CAPITAL MANAGEMENT, LLCadded · filed 12 Aug 2026	1,141,858$3.0M	+725,620+174.3%
Ikarian Capital, LLCunchanged · filed 14 Aug 2026	1,053,797$2.8M	00.0%