★ WIDE MOAT STOCKS & COMPETITIVE ADVANTAGES ★
VOL. XCIV, NO. 247
Stock Profile
TransDigm Group Incorporated (TDG) Moat Analysis
TransDigm Group Incorporated
TDG · New York Stock Exchange
Weighted average of segment moat scores, combining moat strength, durability, confidence, market structure, pricing power, and market share.
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Overview
TransDigm supplies highly engineered aircraft components; the FY2025 10-K estimates about 90% of sales were proprietary and 55% aftermarket. Nine-month FY2026 mix was 54.2% Power & Control, 44.1% Airframe and 1.7% Non-aviation. The aerospace segments retain two distinct advantages: certification and design-in make supplier changes costly, while a platform life that can exceed 50 years drives recurring spares and repair demand. Regulatory compliance is incorporated into qualification rather than double-counted, and the operating system is not separately scored because execution practices are replicable. The Non-aviation segment is verified moatless without product-level evidence. Q3 net sales were $2,741m and net income attributable to TransDigm was $539m; nine-month gross margin was 59.3%. At June 27, 2026, 62,855,861 shares were issued and 7,586,058 held in treasury; 55,276,525 shares were outstanding on July 31.
Primary segment
Power & Control
Market structure
Competitive
Market share
—
HHI: —
Coverage
3 segments · 5 tags
Updated 2026-08-23
Segments
Power & Control
Highly engineered aerospace power & control components (OEM and aftermarket)
Revenue
54.2%
Structure
Competitive
Pricing
strong
Share
—
Peers
Airframe
Highly engineered aerospace airframe components (OEM and aftermarket)
Revenue
44.1%
Structure
Competitive
Pricing
strong
Share
—
Peers
Non-aviation
Niche engineered industrial products (non-aviation markets)
Revenue
1.7%
Structure
Competitive
Pricing
weak
Share
—
Peers
Moat Claims
Power & Control
Highly engineered aerospace power & control components (OEM and aftermarket)
Nine-month FY2026 segment net sales: $4,099m of $7,569m total. Segment operating_profit_share proxy: EBITDA As Defined $2,197m of $4,061m total segment EBITDA As Defined (FY2026 Q3 Form 10-Q).
Design In Qualification
Demand
Design In Qualification
Strength
Durability
Confidence
Evidence
Components are designed into aircraft platforms and face high switching friction: re-qualification/certification is time-consuming and costly; platforms and parts live for decades.
Design In Qualification moat: definition, examples, and stocks
Erosion risks
- PMA/alternate parts qualification in some product categories
- OEM push for dual-sourcing on new programs
- Airline/MRO cost-down initiatives increasing substitution attempts
Leading indicators
- Net sales growth split (aftermarket vs OEM vs defense)
- New platform wins and shipset content
- Evidence of increased PMA penetration in key product lines
Counterarguments
- Certification barriers vary by part; some components can be competitively requalified
- OEMs can design out or re-source parts on new platform refreshes
Installed Base Consumables
Demand
Installed Base Consumables
Strength
Durability
Confidence
Evidence
Large installed base of in-service aircraft drives recurring aftermarket spares/repairs across long service lives; management reports a majority of sales from aftermarket with higher gross profit and stability vs OEM.
Installed Base Consumables moat: definition, examples, and stocks
Erosion risks
- Used serviceable material (USM) substitution in some parts
- Airframe/OEM redesigns reducing replacement frequency
- Next-gen aircraft architectures changing component content
Leading indicators
- Aftermarket % of net sales trend
- Global flight hours and utilization (commercial and defense)
- MRO shop visit cadence and airline capacity growth
Counterarguments
- Aftermarket demand is tied to utilization; downturns reduce near-term parts consumption
- Some categories face meaningful USM and repair competition
Airframe
Highly engineered aerospace airframe components (OEM and aftermarket)
Nine-month FY2026 segment net sales: $3,340m of $7,569m total. Segment operating_profit_share proxy: EBITDA As Defined $1,808m of $4,061m total segment EBITDA As Defined (FY2026 Q3 Form 10-Q).
Design In Qualification
Demand
Design In Qualification
Strength
Durability
Confidence
Evidence
Airframe components are qualified at the platform level; design-in plus certification/qualification friction reduces incentive to re-source during long platform life cycles.
Design In Qualification moat: definition, examples, and stocks
Erosion risks
- Platform redesigns that change component specifications
- OEM dual-source strategies on new builds
- MRO adoption of alternates where permitted
Leading indicators
- Aftermarket net sales growth vs fleet utilization
- Platform/program win rate and shipset content changes
- Evidence of increased alternate qualification activity
Counterarguments
- Some airframe parts are less technically complex and may be easier to re-source
- OEMs can shift suppliers on new programs with enough lead time
Installed Base Consumables
Demand
Installed Base Consumables
Strength
Durability
Confidence
Evidence
Recurring spares/repairs demand over multi-decade fleet lives; company reports majority of sales from aftermarket with higher gross profit and stability versus OEM.
Installed Base Consumables moat: definition, examples, and stocks
Erosion risks
- USM and repair alternatives in some categories
- Extended maintenance intervals reducing replacement frequency
- Fleet retirement waves reducing installed base
Leading indicators
- Aftermarket % of sales trend
- Global flight hours and maintenance intensity
- Airline financial health (drives discretionary maintenance timing)
Counterarguments
- Aftermarket volume is cyclical with utilization
- Repair/overhaul competition can take share in certain parts
Non-aviation
Niche engineered industrial products (non-aviation markets)
Nine-month FY2026 segment net sales: $130m of $7,569m total. Segment operating_profit_share proxy: EBITDA As Defined $56m of $4,061m total segment EBITDA As Defined (FY2026 Q3 Form 10-Q).
Evidence
Once our parts are designed into and sold on a new aircraft
Management describes the design-in dynamic and multi-decade aircraft/platform lives, supporting a long-lived qualification moat.
reduced incentive to certify another supplier
Explicitly cites customer reluctance to re-certify an alternate supplier due to cost/time of certification.
Historically, these aftermarket revenues have produced a higher gross profit and have been more stable
Management estimates ~55% of FY2025 net sales were generated from the aftermarket and that these revenues have historically been higher gross profit and more stable than OEM sales.
Commercial aftermarket sales increased in the first nine months of fiscal 2026
The latest filing reports continued aftermarket growth and supplies the nine-month segment sales and EBITDA As Defined used in this record.
reduced incentive to certify another supplier
The filing describes long-lived aftermarket consumption following design-in and highlights certification costs/time as a deterrent to qualifying alternate suppliers.
Showing 5 of 7 sources.
Risks & Indicators
Erosion risks
- PMA/alternate parts qualification in some product categories
- OEM push for dual-sourcing on new programs
- Airline/MRO cost-down initiatives increasing substitution attempts
- Used serviceable material (USM) substitution in some parts
- Airframe/OEM redesigns reducing replacement frequency
- Next-gen aircraft architectures changing component content
Leading indicators
- Net sales growth split (aftermarket vs OEM vs defense)
- New platform wins and shipset content
- Evidence of increased PMA penetration in key product lines
- Aftermarket % of net sales trend
- Global flight hours and utilization (commercial and defense)
- MRO shop visit cadence and airline capacity growth
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