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

Amentum Holdings, Inc.

AMTM · NYSE · CIK 0002011286 · Industrials · Specialty Business Services

INSIDER SIGNAL

No active buy signal

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

11 Form 4 transaction lines observed in the same window
0 sales · 11 option, withholding, award, gift or other lines

Last qualifying purchase2025-02-18 · Loughran Barbara · $97.7K

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesNone
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
Heller John E.Chief Executive Officer
○○
Mullen Sean ThomasChief Growth Officer
○○
Johnson Travis BartonChief Financial Officer
○○
Bruning Jill LChief Technology Officer
○○
Arnette Stephen AChief Operating Officer
○○
Thompson Christopher M.T.Director
○
● Purchase▼ Sale○ Other

—

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: 2025-02-18 · Loughran Barbara.

Recent Form 4 activity

0Purchases
0Sales
65Other Form 4 lines
34SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING0 sale line(s) · context only
OTHER11 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
-8.8%
3M
-18.5%
6M
-32.9%
12M
—

Volatility & liquidity

Volatility
46.7%
Beta
0.27
Avg daily value
USD 36.6M

Valuation

Market cap
USD 4.4B
P/E
21.9×

Fundamentals

Profit margin
0.5%
ROE
1.5%
Industry
Specialty Business Services

Market data

Price data up to: 2026-10-03 · Price source: OpenBB/yfinance · From SEC filings: Profit margin, ROE · Fiscal year ended: 2025-10-03 · From Yahoo Finance: Market cap, P/E · Status: PASS

Short interest

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

Shares short
12,329,527
Previous report
12,229,137
Avg daily volume
1,816,633
Days to cover
6.8

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
2025-02-18Loughran BarbaraPurchase (P)Common Stock4,600USD 21.23USD 97,658SEC filing ↗
2025-02-12DEMETRIOU STEVEN J.Purchase (P)Common Stock100,000USD 20.81USD 2,081,000SEC filing ↗

Form 4 evidence

65 transaction lines in the latest 365-day window; 91 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-08-14Thompson Christopher M.T.Gift (G)Common Stock4,250USD 0.00USD 0SEC filing ↗
2026-05-06Mullen Sean ThomasOption exercise / conversion (M)Common Stock9,072USD —USD —SEC filing ↗
2026-05-06Mullen Sean ThomasTax withholding (F)Common Stock2,762USD 24.89USD 68,746SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-08-14Thompson Christopher M.T.Gift (G)Common Stock4,250USD 0.00USD 0SEC filing ↗
2026-05-06Mullen Sean ThomasOption exercise / conversion (M)Common Stock9,072USD —USD —SEC filing ↗
2026-05-06Mullen Sean ThomasTax withholding (F)Common Stock2,762USD 24.89USD 68,746SEC filing ↗
2026-05-06Johnson Travis BartonOption exercise / conversion (M)Common Stock13,609USD —USD —SEC filing ↗
2026-05-06Johnson Travis BartonTax withholding (F)Common Stock4,097USD 24.89USD 101,974SEC filing ↗
2026-05-06Heller John E.Option exercise / conversion (M)Common Stock18,145USD —USD —SEC filing ↗
2026-05-06Heller John E.Tax withholding (F)Common Stock8,184USD 24.89USD 203,700SEC filing ↗
2026-05-06Bruning Jill LOption exercise / conversion (M)Common Stock9,072USD —USD —SEC filing ↗
2026-05-06Bruning Jill LTax withholding (F)Common Stock2,731USD 24.89USD 67,975SEC filing ↗
2026-05-06Arnette Stephen AOption exercise / conversion (M)Common Stock13,609USD —USD —SEC filing ↗
2026-05-06Arnette Stephen ATax withholding (F)Common Stock3,314USD 24.89USD 82,485SEC filing ↗
2026-03-04Bruning Jill LGift (G)Common Stock30,000USD 0.00USD 0SEC filing ↗
2026-03-02Arnette Stephen AOption exercise / conversion (M)Common Stock2,808USD —USD —SEC filing ↗
2026-03-02Arnette Stephen ATax withholding (F)Common Stock750USD 30.70USD 23,025SEC filing ↗
2026-02-17St. Mary Michele TOption exercise / conversion (M)Common Stock7,080USD —USD —SEC filing ↗
2026-02-17St. Mary Michele TTax withholding (F)Common Stock2,308USD 30.05USD 69,355SEC filing ↗
2026-02-06Vollmer John C.Option exercise / conversion (M)Common Stock11,564USD —USD —SEC filing ↗
2026-02-06Vollmer John C.Award / grant (A)Common Stock5,062USD 0.00USD 0SEC filing ↗
2026-02-06Thompson Christopher M.T.Award / grant (A)Common Stock5,062USD 0.00USD 0SEC filing ↗
2026-02-06Rowland Sandra E.Option exercise / conversion (M)Common Stock11,564USD —USD —SEC filing ↗
2026-02-06Rowland Sandra E.Award / grant (A)Common Stock5,062USD 0.00USD 0SEC filing ↗
2026-02-06Loughran BarbaraAward / grant (A)Common Stock5,062USD 0.00USD 0SEC filing ↗
2026-02-06IRELAND SUSAN LESLIEAward / grant (A)Common Stock5,062USD 0.00USD 0SEC filing ↗
2026-02-06EBERHART RALPH EOption exercise / conversion (M)Common Stock11,564USD —USD —SEC filing ↗
2026-02-06EBERHART RALPH EAward / grant (A)Common Stock5,062USD 0.00USD 0SEC filing ↗
2026-02-06Brooks Vincent KOption exercise / conversion (M)Common Stock11,564USD —USD —SEC filing ↗
2026-02-06Brooks Vincent KAward / grant (A)Common Stock5,062USD 0.00USD 0SEC filing ↗
2026-01-28Heller John E.Option exercise / conversion (M)Common Stock51,979USD —USD —SEC filing ↗
2026-01-28Heller John E.Tax withholding (F)Common Stock19,768USD 35.71USD 705,915SEC filing ↗
2025-12-17Mullen Sean ThomasOption exercise / conversion (M)Common Stock9,298USD —USD —SEC 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 · —
TickerAMTM
CIK0002011286
SectorIndustrials
IndustrySpecialty Business Services Yahoo Finance
SEC SIC7389 Services-Business Services, NEC
ExchangeNYSE

Data coverage

Local Form 4 history91 transaction lines from 2024-09-18 to 2026-08-14
2 P purchase lines · 0 S sale lines · 89 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.