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

NORTHROP GRUMMAN CORP /DE/

NOC · NYSE · CIK 0001133421 · Industrials · Aerospace & Defense

INSIDER SIGNAL

No active buy signal

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

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

Last qualifying purchaseNo qualifying purchase is present in the local Form 4 history.

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesHigh
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
KRISHNA ARVINDDirector
○○○
Brown Marianne CatherineDirector
○○○
WELSH MARK A IIIDirector
▼○▼
WINSTON MARY ADirector
○
Turley James SDirector
○
SCHOEWE THOMAS MDirector
○
● Purchase▼ Sale○ Other

Showing the six most active owners; 4 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.—

Recent Form 4 activity

0Purchases
61Sales
47Other Form 4 lines
45SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING21 sale line(s) · context only
OTHER14 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 has not been captured for this ticker yet. The daily market-context job processes the US universe in rotating batches.

Short interest

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

Shares short
2,276,557
Previous report
2,247,342
Avg daily volume
875,392
Days to cover
2.6

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

No qualifying code P equity purchase is present in the local Form 4 history.

Form 4 evidence

108 transaction lines in the latest 365-day window; 756 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-30KRISHNA ARVINDAward / grant (A)Common Stock75USD 483.48USD 36,261SEC filing ↗
2026-09-30Brown Marianne CatherineAward / grant (A)Common Stock96USD 483.48USD 46,414SEC filing ↗
2026-08-03WELSH MARK A IIISale (S)Common Stock95USD 547.53USD 52,015SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-30KRISHNA ARVINDAward / grant (A)Common Stock75USD 483.48USD 36,261SEC filing ↗
2026-09-30Brown Marianne CatherineAward / grant (A)Common Stock96USD 483.48USD 46,414SEC filing ↗
2026-08-03WELSH MARK A IIISale (S)Common Stock95USD 547.53USD 52,015SEC filing ↗
2026-06-30KRISHNA ARVINDAward / grant (A)Common Stock71USD 509.31USD 36,161SEC filing ↗
2026-06-30Brown Marianne CatherineAward / grant (A)Common Stock91USD 509.31USD 46,347SEC filing ↗
2026-05-20WINSTON MARY AAward / grant (A)Common Stock349USD 552.17USD 192,707SEC filing ↗
2026-05-20WELSH MARK A IIIAward / grant (A)Common Stock349USD 552.17USD 192,707SEC filing ↗
2026-05-20Turley James SAward / grant (A)Common Stock349USD 552.17USD 192,707SEC filing ↗
2026-05-20SCHOEWE THOMAS MAward / grant (A)Common Stock349USD 552.17USD 192,707SEC filing ↗
2026-05-20Ross Kimberly A.Award / grant (A)Common Stock349USD 552.17USD 192,707SEC filing ↗
2026-05-20ROUGHEAD GARYAward / grant (A)Common Stock349USD 552.17USD 192,707SEC filing ↗
2026-05-20KRISHNA ARVINDAward / grant (A)Common Stock349USD 552.17USD 192,707SEC filing ↗
2026-05-20Grady Christopher W.Award / grant (A)Common Stock349USD 552.17USD 192,707SEC filing ↗
2026-05-20Brown Marianne CatherineAward / grant (A)Common Stock349USD 552.17USD 192,707SEC filing ↗
2026-05-20ABNEY DAVID PAward / grant (A)Common Stock349USD 552.17USD 192,707SEC filing ↗
2026-05-04WELSH MARK A IIISale (S)Common Stock95USD 571.68USD 54,310SEC filing ↗
2026-03-02Simpson Kathryn GSale (S)Common Stock873USD 745.00USD 650,385SEC filing ↗
2026-02-27ROEDER ROSHAN SSale (S)Common Stock1,754USD 720.00USD 1,262,880SEC filing ↗
2026-02-19Simpson Kathryn GSale (S)Common Stock194USD 727.62USD 141,158SEC filing ↗
2026-02-19ROEDER ROSHAN SSale (S)Common Stock512USD 727.62USD 372,541SEC filing ↗
2026-02-19Hardesty Michael ASale (S)Common Stock147USD 732.98USD 107,748SEC filing ↗
2026-02-18Davies Benjamin R.Sale (S)Common Stock2,189USD 719.61USD 1,575,255SEC filing ↗
2026-02-17Warden Kathy JOption exercise / conversion (M)Common Stock10,760USD 0.00USD 0SEC filing ↗
2026-02-17Warden Kathy JTax withholding (F)Common Stock4,857USD 701.12USD 3,405,340SEC filing ↗
2026-02-17Simpson Kathryn GSale (S)Common Stock779USD 702.56USD 547,294SEC filing ↗
2026-02-17Simpson Kathryn GOption exercise / conversion (M)Common Stock387USD 0.00USD 0SEC filing ↗
2026-02-17Simpson Kathryn GTax withholding (F)Common Stock193USD 701.12USD 135,316SEC filing ↗
2026-02-17ROEDER ROSHAN SSale (S)Common Stock318USD 702.56USD 223,414SEC filing ↗
2026-02-17ROEDER ROSHAN SOption exercise / conversion (M)Common Stock2,017USD 0.00USD 0SEC filing ↗
2026-02-17ROEDER ROSHAN STax withholding (F)Common Stock992USD 701.12USD 695,511SEC 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 · —
TickerNOC
CIK0001133421
SectorIndustrials
IndustryAerospace & Defense Yahoo Finance
SEC SIC3812 Search, Detection, Navigation, Guidance, Aeronautical Sys
ExchangeNYSE

Data coverage

Local Form 4 history756 transaction lines from 2020-02-03 to 2026-09-30
0 P purchase lines · 290 S sale lines · 466 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.