Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

Acumen Pharmaceuticals, Inc.

ABOS · Nasdaq · CIK 0001576885 · Healthcare · Biotechnology

INSIDER SIGNAL

No active buy signal

0 qualifying P purchase groups
in the current 180-day scoring window

14 Form 4 transaction lines observed in the same window
4 sales · 10 option, withholding, award, gift or other lines

Last qualifying purchase2023-07-21 · Kolchinsky Peter; RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund II, L.P.; Shah Rajeev M. · $40.0M

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesModerate
Buy signal statusInactive
Score anatomy

No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.

ClusterNot calculated
Purchase sizeNot calculated
RoleNot calculated
RecencyNot calculated
ConvictionNot calculated

Why is there no score?

  • No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
  • Sales and other Form 4 activity remain visible as context and do not create a negative score.

Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
Porter DerrellDirector
○○▼▼○▼
Fountain Nathan BDirector
○▼
Kolchinsky Peter; RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund II, L.P.; Shah Rajeev M.Director; Director,TenPercentOwner
○
Drapkin Kimberlee CDirector
○
Stalfort John A IIIDirector
○
Ives Jeffrey L.Director
○
● Purchase▼ Sale○ Other

Showing the six most active owners; 2 additional owner(s) remain in Form 4 evidence.

Purchase breadth, concentration & cluster buying

These modules activate when qualifying purchases enter the 180-day research window.

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot. Last qualifying purchase: 2023-07-21 · Kolchinsky Peter; RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund II, L.P.; Shah Rajeev M..

Recent Form 4 activity

0Purchases
48Sales
22Other Form 4 lines
37SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING4 sale line(s) · context only
OTHER10 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context provides additional background on recent price performance and risk. It does not affect the Insider Signal.

Price performance

1M
-34.2%
3M
-23.6%
6M
-24.4%
12M
—

Volatility & liquidity

Volatility
84.3%
Beta
0.38
Avg daily value
USD 857,192

Valuation

Market cap
USD 147.5M
P/E
—

Fundamentals

Profit margin
0.0%
ROE
-172.3%
Industry
Biotechnology

Market data

Price data up to: 2026-10-04 · Price source: OpenBB/yfinance · From SEC filings: ROE · Fiscal year ended: 2025-12-31 · From Yahoo Finance: Market cap, Profit margin · Status: PASS

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
3,079,512
Previous report
2,804,144
Avg daily volume
641,518
Days to cover
4.8

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2023-07-21Kolchinsky Peter; RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund II, L.P.; Shah Rajeev M.Purchase (P)Common Stock5,161,290USD 7.75USD 39,999,998SEC filing ↗
2021-07-06Stalfort John A IIIPurchase (P)Common Stock35,000USD 16.00USD 560,000SEC filing ↗
2021-07-06SANDS FRANK M.; Sands Capital Global Venture Fund II, L.P.; Sands Capital Life Sciences Pulse Fund, LLC; Sands Capital Ventures Discovery Fund III, L.P.Purchase (P)Common Stock450,000USD 14.88USD 6,696,000SEC filing ↗
2021-07-06Manning Paul BPurchase (P)Common Stock312,500USD 16.00USD 5,000,000SEC filing ↗
2021-07-06Kolchinsky Peter; RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund II, L.P.; Shah Rajeev M.Purchase (P)Common Stock1,875,000USD 16.00USD 30,000,000SEC filing ↗
2021-07-06Hardie Robert D.Purchase (P)Common Stock312,500USD 16.00USD 5,000,000SEC filing ↗
2021-07-06Hardie Robert D.Purchase (P)Common Stock750,000USD 16.00USD 12,000,000SEC filing ↗
2021-07-06Fountain Nathan BPurchase (P)Common Stock6,250USD 16.00USD 100,000SEC filing ↗

Form 4 evidence

70 transaction lines in the latest 365-day window; 142 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-06-17Porter DerrellSale (S)Common Stock13,040USD 2.33USD 30,383SEC filing ↗
2026-06-17Porter DerrellOption exercise / conversion (M)Common Stock13,040USD 1.07USD 13,953SEC filing ↗
2026-06-16Porter DerrellSale (S)Common Stock12,800USD 2.33USD 29,824SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-06-17Porter DerrellSale (S)Common Stock13,040USD 2.33USD 30,383SEC filing ↗
2026-06-17Porter DerrellOption exercise / conversion (M)Common Stock13,040USD 1.07USD 13,953SEC filing ↗
2026-06-16Porter DerrellSale (S)Common Stock12,800USD 2.33USD 29,824SEC filing ↗
2026-06-15Porter DerrellSale (S)Common Stock6,460USD 2.35USD 15,181SEC filing ↗
2026-06-15Porter DerrellOption exercise / conversion (M)Common Stock6,460USD 1.07USD 6,912SEC filing ↗
2026-06-09Fountain Nathan BSale (S)Common Stock6,400USD 2.23USD 14,272SEC filing ↗
2026-06-03Stoppel LauraAward / grant (A)Common Stock35,500USD 0.00USD 0SEC filing ↗
2026-06-03Stalfort John A IIIAward / grant (A)Common Stock35,500USD 0.00USD 0SEC filing ↗
2026-06-03Porter DerrellAward / grant (A)Common Stock35,500USD 0.00USD 0SEC filing ↗
2026-06-03Kolchinsky Peter; RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund II, L.P.; Shah Rajeev M.Award / grant (A)Common Stock35,500USD 0.00USD 0SEC filing ↗
2026-06-03Ives Jeffrey L.Award / grant (A)Common Stock35,500USD 0.00USD 0SEC filing ↗
2026-06-03Golumbeski GeorgeAward / grant (A)Common Stock35,500USD 0.00USD 0SEC filing ↗
2026-06-03Fountain Nathan BAward / grant (A)Common Stock35,500USD 0.00USD 0SEC filing ↗
2026-06-03Drapkin Kimberlee CAward / grant (A)Common Stock35,500USD 0.00USD 0SEC filing ↗
2026-03-16Kolchinsky Peter; RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund II, L.P.; Shah Rajeev M.Award / grant (A)Common Stock6,060,606USD 3.30USD 20,000,000SEC filing ↗
2026-03-06Meisner Derek MSale (S)Common Stock2,090USD 3.26USD 6,813SEC filing ↗
2026-03-06Meisner Derek MOption exercise / conversion (M)Common Stock2,090USD 1.85USD 3,866SEC filing ↗
2026-02-27Meisner Derek MSale (S)Common Stock9,406USD 3.01USD 28,312SEC filing ↗
2026-02-27Meisner Derek MOption exercise / conversion (M)Common Stock9,406USD 1.85USD 17,401SEC filing ↗
2026-01-28Meisner Derek MSale (S)Common Stock2,671USD 3.00USD 8,013SEC filing ↗
2026-01-28Meisner Derek MOption exercise / conversion (M)Common Stock2,671USD 1.85USD 4,941SEC filing ↗
2026-01-26Meisner Derek MSale (S)Common Stock15,085USD 3.00USD 45,255SEC filing ↗
2026-01-26Meisner Derek MOption exercise / conversion (M)Common Stock15,085USD 1.85USD 27,907SEC filing ↗
2026-01-23Meisner Derek MSale (S)Common Stock5,633USD 1.90USD 10,703SEC filing ↗
2026-01-22Zuga MattSale (S)Common Stock1,687USD 1.86USD 3,138SEC filing ↗
2026-01-22Siemers EricSale (S)Common Stock895USD 1.82USD 1,629SEC filing ↗
2026-01-22OConnell Daniel JosephSale (S)Common Stock2,689USD 1.88USD 5,055SEC filing ↗
2026-01-22Meisner Derek MSale (S)Common Stock1,054USD 1.84USD 1,939SEC filing ↗
2026-01-22Barton RussellSale (S)Common Stock462USD 1.84USD 850SEC filing ↗
2026-01-21Zuga MattSale (S)Common Stock2,473USD 1.81USD 4,476SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerABOS
CIK0001576885
SectorHealthcare
IndustryBiotechnology Yahoo Finance
SEC SIC2836 Biological Products, (No Diagnostic Substances)
ExchangeNasdaq

Data coverage

Local Form 4 history142 transaction lines from 2021-07-06 to 2026-06-17
9 P purchase lines · 66 S sale lines · 67 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.