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

TransDigm Group INC

TDG · NYSE · CIK 0001260221 · Industrials · Aerospace & Defense

INSIDER SIGNAL

No active buy signal

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

286 Form 4 transaction lines observed in the same window
262 sales · 24 option, withholding, award, gift or other lines

Last qualifying purchase2026-02-25 · SMALL ROBERT J · $1.3K

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
Howley W NicholasDirector
○▼○○○○▼▼▼○▼○▼○
Reiss JoelCo-Chief Operating Officer
○▼○▼○▼▼○▼○▼○▼
SMALL ROBERT JDirector
○○
Palmer PeterDirector
○
Krasik Irina IgorevnaDirector
○
Santana MicheleDirector
○
● Purchase▼ Sale○ Other

Showing the six most active owners; 5 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: 2026-02-25 · SMALL ROBERT J.

Recent Form 4 activity

8Purchases
557Sales
68Other Form 4 lines
69SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING262 sale line(s) · context only
OTHER24 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
1,199,613
Previous report
1,067,135
Avg daily volume
442,415
Days to cover
2.7

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
2026-02-25SMALL ROBERT JPurchase (P)Common Stock1USD 1,285.00USD 1,285SEC filing ↗
2026-02-06Lisman MichaelPurchase (P)Common Stock950USD 1,284.26USD 1,220,047SEC filing ↗
2025-11-14Lisman MichaelPurchase (P)Common Stock1,954USD 1,339.14USD 2,616,673SEC filing ↗
2024-01-22HENNESSY SEAN PPurchase (P)Common Stock0USD 1,065.40USD 511SEC filing ↗
2023-07-10Santana MichelePurchase (P)Common Stock1USD 883.30USD 883SEC filing ↗
2023-03-24Santana MichelePurchase (P)Common Stock1USD 692.90USD 693SEC filing ↗
2023-01-24Santana MichelePurchase (P)Common Stock10USD 684.64USD 6,846SEC filing ↗
2022-12-23Santana MichelePurchase (P)Common Stock1USD 619.54USD 620SEC filing ↗
2022-08-26CRONIN JANE M.Purchase (P)Common Stock9USD 643.87USD 5,550SEC filing ↗
2022-05-23SMALL ROBERT JPurchase (P)Common Stock28,453USD 565.00USD 16,075,814SEC filing ↗
2022-05-23SMALL ROBERT JPurchase (P)Common Stock28,453USD 565.00USD 16,075,814SEC filing ↗
2022-05-19SMALL ROBERT JPurchase (P)Common Stock19,398USD 544.09USD 10,554,249SEC filing ↗
2022-05-19SMALL ROBERT JPurchase (P)Common Stock19,398USD 544.09USD 10,554,249SEC filing ↗
2022-04-04Santana MichelePurchase (P)Common Stock1USD 668.88USD 669SEC filing ↗
2021-12-31Santana MichelePurchase (P)Common Stock1USD 634.26USD 634SEC filing ↗

Form 4 evidence

633 transaction lines in the latest 365-day window; 3,236 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-15Reiss JoelSale (S)Common Stock4,100USD 1,128.04USD 4,624,944SEC filing ↗
2026-10-15Reiss JoelOption exercise / conversion (M)Common Stock4,100USD 284.97USD 1,168,377SEC filing ↗
2026-09-18SMALL ROBERT JJ (J)Common Stock—USD —USD —SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-15Reiss JoelSale (S)Common Stock4,100USD 1,128.04USD 4,624,944SEC filing ↗
2026-10-15Reiss JoelOption exercise / conversion (M)Common Stock4,100USD 284.97USD 1,168,377SEC filing ↗
2026-09-18SMALL ROBERT JJ (J)Common Stock—USD —USD —SEC filing ↗
2026-09-18Santana MicheleAward / grant (A)Common Stock34USD 1,085.00USD 36,890SEC filing ↗
2026-09-18SMALL ROBERT JAward / grant (A)Common Stock52USD 1,085.00USD 56,420SEC filing ↗
2026-09-18Palmer PeterAward / grant (A)Common Stock34USD 1,085.00USD 36,890SEC filing ↗
2026-09-18MCCULLOUGH GARY EAward / grant (A)Common Stock41USD 1,085.00USD 44,485SEC filing ↗
2026-09-18Krasik Irina IgorevnaAward / grant (A)Common Stock13USD 1,085.00USD 14,105SEC filing ↗
2026-09-18Howley W NicholasAward / grant (A)Common Stock126USD 1,085.00USD 136,710SEC filing ↗
2026-09-18HENNESSY SEAN PAward / grant (A)Common Stock46USD 1,085.00USD 49,910SEC filing ↗
2026-09-18Graff MichaelAward / grant (A)Common Stock34USD 1,085.00USD 36,890SEC filing ↗
2026-09-18CRONIN JANE M.Award / grant (A)Common Stock34USD 1,085.00USD 36,890SEC filing ↗
2026-09-18BARR DAVIDAward / grant (A)Common Stock46USD 1,085.00USD 49,910SEC filing ↗
2026-09-15Reiss JoelSale (S)Common Stock3,900USD 1,094.58USD 4,268,870SEC filing ↗
2026-09-15Reiss JoelOption exercise / conversion (M)Common Stock3,900USD 284.97USD 1,111,383SEC filing ↗
2026-08-18Howley W NicholasSale (S)Common Stock10,132USD 1,236.27USD 12,525,920SEC filing ↗
2026-08-18Howley W NicholasOption exercise / conversion (M)Common Stock10,132USD 66.47USD 673,474SEC filing ↗
2026-08-17Reiss JoelSale (S)Common Stock3,900USD 1,238.76USD 4,831,158SEC filing ↗
2026-08-17Reiss JoelOption exercise / conversion (M)Common Stock3,900USD 284.97USD 1,111,383SEC filing ↗
2026-07-20Howley W NicholasSale (S)Common Stock10,132USD 1,216.08USD 12,321,272SEC filing ↗
2026-07-20Howley W NicholasOption exercise / conversion (M)Common Stock10,132USD 66.47USD 673,474SEC filing ↗
2026-07-15Reiss JoelSale (S)Common Stock414USD 1,231.11USD 509,678SEC filing ↗
2026-07-15Reiss JoelSale (S)Common Stock3,486USD 1,216.21USD 4,239,696SEC filing ↗
2026-07-15Reiss JoelOption exercise / conversion (M)Common Stock3,900USD 284.97USD 1,111,383SEC filing ↗
2026-06-18Howley W NicholasJ (J)Common Stock—USD —USD —SEC filing ↗
2026-06-18Howley W NicholasSale (S)Common Stock10,132USD 1,319.55USD 13,369,715SEC filing ↗
2026-06-18Howley W NicholasSale (S)Common Stock10,132USD 1,319.55USD 13,369,715SEC filing ↗
2026-06-18Howley W NicholasSale (S)Common Stock10,132USD 1,319.55USD 13,369,715SEC filing ↗
2026-06-18Howley W NicholasOption exercise / conversion (M)Common Stock10,132USD 66.47USD 673,474SEC filing ↗
2026-06-18Howley W NicholasOption exercise / conversion (M)Common Stock10,132USD 66.47USD 673,474SEC 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 · —
TickerTDG
CIK0001260221
SectorIndustrials
IndustryAerospace & Defense Yahoo Finance
SEC SIC3728 Aircraft Parts & Auxiliary Equipment, NEC
ExchangeNYSE

Data coverage

Local Form 4 history3,236 transaction lines from 2020-01-07 to 2026-10-15
325 P purchase lines · 2,464 S sale lines · 447 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.