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American Express Co

NYSE: AXP · USD

American Express Co (AXP) Economic Moat Analysis56

Competitive advantages, dated evidence and erosion risks.

Narrow economic moat

American Express has a narrow moat from its premium membership franchise and established merchant-and-partner network. Fee-paying acquisitions, repeated transaction growth and partnership renewals demonstrate current appeal. Network scale supports this advantage, although the strength of self-reinforcing effects is only partly demonstrated. Pricing power is mixed: fee revenue grows, but portfolio growth obscures unit pricing, merchant discount rates have declined with spending mix, and partner costs have risen. Exceptional durability is not established.

Intangible assets

The premium membership franchise combines brand, benefits and partner relationships with demonstrated willingness to acquire fee-paying cards and continue spending.

Durability
Repeated fee revenue growth, renewed partnerships and engagement following product refreshes support a current, renewable advantage. Its persistence depends on continued investment and attractive customer value.
Competitors
Comparison not established
Erosion risks
Rival premium offerings can compete for customers and partners. Increased cobrand payments and rewards-and-service costs show that maintaining differentiation consumes resources. Reported retention is not quantified.
What would invalidate the thesis
Sustained deterioration in fee-paying acquisitions, customer retention and transaction activity despite continued benefits investment, or repeated major partnership losses accompanied by weaker customer demand, would invalidate this advantage.
Evidence (6) · Counterevidence (4)

Network effects

An established acceptance network connects cardholders, merchants and partners. Broad acceptance and growing network transaction revenues support current network utility; management's stronger claim that high-spending members attract further partners is only partly demonstrated.

Durability
Reported acceptance at over 170 million locations and approximately 99% of U.S. credit-card-accepting merchants makes the network useful at substantial scale. These figures establish reach, but do not quantify competitors' replication costs or guarantee durable pricing premiums.
Competitors
Comparison not established
Erosion risks
Acceptance parity is not exclusivity. Alternative payment methods, merchant steering, partner bargaining and regulation can divert transactions or reduce monetization. Lower average merchant discount rates already constrain revenue realization, primarily through spending mix.
What would invalidate the thesis
A persistent decline in acceptance or active network volumes, partner departures that weaken cardholder utility, or continuing monetization declines that overwhelm transaction growth would invalidate the network's contribution to the moat.
Evidence (5) · Counterevidence (5)

Changes since the previous analysis

  • Retain the previous narrow verdict: the supplied operating evidence supports current advantages without establishing exceptional durability.
  • Make realized increases in partner payments and benefits costs explicit erosion evidence; distinguish mix-driven merchant discount-rate declines from demonstrated like-for-like price cuts.
  • Add evidence-based management assessments, balancing adopted compensation arrangements and independent oversight against realized compliance remediation and expected AML enforcement.

Evidence limitations

  • All evidence is from issuer filings. Operating results and disclosed arrangements support numerical grades, while brand superiority, best-in-class performance and network reinforcement claims lack independent comparative verification.
  • Competitive passages identify generic categories. Named compensation peers are not established product-market competitors; named partners and the former partner are not treated as competitors. Competitor arrays therefore remain empty.
  • No quantified customer retention rates, customer switching costs, comparable competitor economics or controlled evidence of incremental network effects are supplied.
  • Card fee revenue growth combines portfolio size, mix and product refreshes; supplied passages do not isolate like-for-like fee increases or customer responses to specific increases.
  • Merchant pricing arrangements are described in the 2023 annual report; their continued details in 2026 are not established. Current regulatory disclosures identify constraints but do not establish that every possible restriction has occurred.
  • The proxy discloses incentive design and actual grants, but supplied ownership passages omit holdings amounts. February 2026 grants establish adoption and grant, not subsequent vesting or performance.
  • All source dates have dateKind filed. The latest supplied operating evidence covers June 30, 2026 and was filed July 24, 2026; later operating developments are not established.

Financial indicators to test against the thesis

Calculated from annual filings. Missing data remains unavailable. Detailed financial charts remain in the other topics.

Financial indicators to test against the thesis
PeriodGross marginOperating marginROICFCF margin
2021———47.2%
2022———56.2%
2023———45.7%
2024———31.3%
2025———38.7%

Pricing power56

  • Pricing outcomes

    Fee-paying acquisitions and sustained fee revenue growth support willingness to pay. However, growth is substantially portfolio-driven, and average merchant discount rates fell primarily with spending mix. Strong like-for-like pricing power is not demonstrated.

  • Customer demand

    Repeated 10% quarterly transaction growth, continuing fee revenue growth and disclosed partnership renewals provide strong evidence of repeat demand. Customer retention is assessed partly from indirect operating evidence; management reports strong retention without a rate or cohort analysis.

  • Margin resilience

    Operating expenses grew slower than revenue, while rewards, services and business development expenses collectively grew faster. Partner-cost inflation and merchant-rate mix pressure make economic resilience mixed; aggregate margins alone do not establish pricing strength.

  • Pricing freedom

    Annual fees and negotiated merchant discount rates demonstrate some pricing discretion. OptBlue processors determine their merchant pricing, partner renegotiations constrain economics, and regulation can restrict fees and acceptance terms. The merchant-contract evidence is historical and detailed repricing rights are absent.

Management69

  • Capital discipline

    Actual capital distributions alongside maintenance of the 2025 CET1 target range and repurchases generally exceeding employee issuance support disciplined capital management. First-half 2026 distributions reached 86% of common-shareholder net income, leaving less earnings retained; repurchase valuation and acquisition returns are not established.

  • Incentive alignment

    Disclosed scorecard metrics, risk-adjustable payouts, multi-year performance equity and hedging restrictions support alignment. The February 2026 grant is an actual grant with disclosed terms, not evidence of completed vesting. Actual ownership amounts and long-term incentive outcomes are missing.

  • Execution

    Fee-paying acquisitions, partner renewals, expanding acceptance, transaction growth and higher first-quarter net income demonstrate commercial execution. Attribution to management is indirect operating evidence. Realized compliance remediation and expected AML enforcement materially qualify this assessment.

  • Governance

    Independent directors, executive sessions, annual elections and proxy access provide substantive oversight mechanisms. Realized remediation costs and disclosed AML deficiencies show that formal oversight has not prevented important control problems; expected enforcement is not treated as a completed penalty.

Sources and methodology

Current publication · Updated 18/10/2026 · Version 5

AI interpretation based on checked source excerpts. Issuer assertions and evidence limitations remain explicit.

Policy quality-scores-2: six equally weighted categories. The overall score requires full coverage. Missing inputs are not zero. Qualitative grades are sourced interpretations, not probabilities. 4/6 · 19/10/2026

Moat56

Equal-weight average of four evidence-backed rubric grades (0–4), scaled to 100.

structural advantage · 3/4 · Fee-paying acquisitions, partnership renewals and extensive merchant acceptance demonstrate an established differentiated franchise. The exact contribution of brand versus purchased benefits and network effects cannot be isolated.

durability · 2/4 · Thirty consecutive quarters of double-digit fee revenue growth and renewed partnerships support persistence. Rising partner payments and a disclosed historical partnership loss limit confidence in durable bargaining power.

customer dependency · 2/4 · Transaction growth and reported strong retention demonstrate repeat use and appeal. They do not establish indispensable customer workflows or costly switching, and engagement requires continued benefits spending.

erosion resilience · 2/4 · Ongoing transaction and network revenue growth show resilience so far, balanced against realized partner-cost increases and lower average merchant discount rates. Competitive and regulatory risks remain possibilities rather than proof of franchise collapse.

Pricing power56

Equal-weight average of four evidence-backed rubric grades (0–4), scaled to 100.

realized pricing · 2/4 · Fee-paying acquisitions and sustained fee revenue growth support willingness to pay. However, growth is substantially portfolio-driven, and average merchant discount rates fell primarily with spending mix. Strong like-for-like pricing power is not demonstrated.

retention · 3/4 · Repeated 10% quarterly transaction growth, continuing fee revenue growth and disclosed partnership renewals provide strong evidence of repeat demand. Customer retention is assessed partly from indirect operating evidence; management reports strong retention without a rate or cohort analysis.

margin resilience · 2/4 · Operating expenses grew slower than revenue, while rewards, services and business development expenses collectively grew faster. Partner-cost inflation and merchant-rate mix pressure make economic resilience mixed; aggregate margins alone do not establish pricing strength.

contractual freedom · 2/4 · Annual fees and negotiated merchant discount rates demonstrate some pricing discretion. OptBlue processors determine their merchant pricing, partner renegotiations constrain economics, and regulation can restrict fees and acceptance terms. The merchant-contract evidence is historical and detailed repricing rights are absent.

Predictability90

Five consecutive annual periods. Equal weights: nondeclining revenue frequency; revenue-growth volatility (5–40pp); positive FCF frequency; FCF-margin volatility (3–20pp). Stability indicator, not a growth forecast.

Nondeclining revenue years (%)
100.00
Revenue growth volatility (pp)
7.52
Positive FCF years (%)
100.00
FCF margin volatility (pp)
8.38

Financial strength—

Missing required inputs: netDebtEbitGrade, currentRatioGrade. Equal-weight grades: debt/FCF (1–8x), net debt/earnings before interest and tax (0–5x), interest service (1–12x), current ratio (0.75–2x). Earnings use reported operating income, or reported pretax profit plus reported interest expense when operating income is unavailable. Interest service uses earnings/interest expense; if unavailable, it uses reported operating cash flow/cash interest paid, without relabeling cash paid as accrued expense. Nonpositive cash flow/earnings score 0 for their service component; reported zero interest with a positive numerator scores 100. Net cash scores 100 for net leverage. Missing disclosures remain unavailable. General nonfinancial-company rubric, not a credit rating; exceptional and nonoperating gains are not normalized out. IFRS finance-cost and cash-flow classifications retain their reported scope.

debtFcfGrade
62.73
interestCoverageGrade
11.85
Debt / FCF (x)
3.61
cashInterestPaid
8000.00
cashInterestCoverage
2.30

Capital allocation—

Missing required inputs: operatingReturn. Three-year equal-weight indicators: pretax return on average invested capital (0–25%; equity + debt − cash, each year and its prior year), share-count growth (0–5%, lower better), share-based cost/revenue (2–20%, lower better), consolidated FCF/net income (0–1x). Return uses reported operating income or, if unavailable, EBIT calculated from reported pretax profit plus reported interest expense; exceptional/nonoperating gains are not normalized out. Share-based cost uses the reported cash-flow add-back or, if absent, separately reported recognized compensation expense; the latter never becomes an FCF adjustment. Nonpositive net income scores 0 for cash conversion; absent income/FCF stays unavailable. Nonpositive invested capital has no defined return and remains unavailable. Does not establish acquisition quality or buyback timing.

3-year average dilution (%)
-2.55
3-year average SBC / revenue (%)
1.28
cashConversionGrade
100.00

Management69

Equal-weight average of four evidence-backed rubric grades (0–4), scaled to 100.

capital discipline · 3/4 · Actual capital distributions alongside maintenance of the 2025 CET1 target range and repurchases generally exceeding employee issuance support disciplined capital management. First-half 2026 distributions reached 86% of common-shareholder net income, leaving less earnings retained; repurchase valuation and acquisition returns are not established.

incentive alignment · 3/4 · Disclosed scorecard metrics, risk-adjustable payouts, multi-year performance equity and hedging restrictions support alignment. The February 2026 grant is an actual grant with disclosed terms, not evidence of completed vesting. Actual ownership amounts and long-term incentive outcomes are missing.

execution · 3/4 · Fee-paying acquisitions, partner renewals, expanding acceptance, transaction growth and higher first-quarter net income demonstrate commercial execution. Attribution to management is indirect operating evidence. Realized compliance remediation and expected AML enforcement materially qualify this assessment.

governance · 2/4 · Independent directors, executive sessions, annual elections and proxy access provide substantive oversight mechanisms. Realized remediation costs and disclosed AML deficiencies show that formal oversight has not prevented important control problems; expected enforcement is not treated as a completed penalty.

Evidence

​ ▪ Added 12.5 million new proprietary cards, with over 70% of new accounts acquired on fee-paying products, bringing the total number of cards-in-force issued on our global network to 152.8 million.

Proxy summary / 2025 proprietary card acquisitions and fee-paying products · Filed 25/03/2026

Delivered 18% growth in net card fee revenues, to reach a record of $10 billion for the full year, and achieved the 30th consecutive quarter of double-digit year-over-year growth in the fourth quarter of 2025.

2025 performance highlights / multiquarter net card fee growth · Filed 25/03/2026

Net card fees grew 15 percent, reflecting high levels of new card acquisitions, strong Card Member retention and our ongoing cycle of product refreshes.

MD&A / second-quarter 2026 net card fees and reported retention · Filed 24/07/2026

Overall transaction growth of 10 percent for the quarter reflected continued strong engagement from our customers.

MD&A / second-quarter 2026 transaction growth · Filed 24/07/2026

​ ▪ Expanded our network of world-class partners and renewed several key cobrand partnerships including British Airways, Air France-KLM and ANA.

Proxy summary / renewed cobrand partnerships · Filed 25/03/2026

U.S. Consumer Services billed business grew 11 percent, driven by our premium card portfolios, including the acceleration in the U.S.

MD&A / U.S. consumer billed business growth · Filed 24/07/2026

The amount we pay to our cobrand partners has increased, particularly in the United States, and may continue to increase as arrangements are renegotiated due to increasingly intense competition for cobrand partners among card issuers and networks.

Risk factors / realized increases in cobrand partner payments · Filed 06/02/2026

The loss of exclusivity arrangements with business partners, the loss of the partner relationship altogether (whether by non-renewal at the end of the contract period, such as the end of our relationship with Costco in the United States in 2016, or as the result of a merger, legal or regulatory action or otherwise) or the renegotiation of existing partnerships with terms that are significantly worse for us could have a material adverse impact on our business and results of operations.

Risk factors / partnership loss, exclusivity and historical non-renewal · Filed 06/02/2026

Card Member rewards, Card Member services and Business development expenses, which are generally driven by volumes and usage, collectively grew faster than revenues as a result of enhancements to our value propositions to drive Card Member engagement and acquisition and the mix shift towards premium products.

MD&A / rewards, services and business development costs growing faster than revenue · Filed 06/02/2026

•changes in the substantial and increasing worldwide competition in the payments industry, including competitive pressure and competitor settlements that may materially impact the prices charged to merchants that accept American Express cards; merchant acceptance, surcharging, steering and other differential acceptance practices; the desirability of competitor premium card products and competition for partnerships and premium experiences, services and benefits; competition for new and existing cobrand relationships; the effects of the emergence of agentic commerce on the payments landscape and customer payment experiences; competition from new and non-traditional competitors, such as financial technology companies, and with respect to new products, services and technologies, such as the emergence or increase in popularity of digital payment platforms and currencies and other alternative payment mechanisms; competitor acquisitions and transactions; and the success of marketing, promotion, rewards programs, offers and travel-, lifestyle- and business-related benefits (e.g., lounges, dining, entertainment and business tools);

Forward-looking factors / premium-card, partnership and payment competition · Filed 24/07/2026

Maintained virtual parity coverage in the U.S., with approximately 99% of credit-card accepting merchants able to accept American Express(3)

2025 compensation performance discussion / U.S. merchant acceptance · Filed 25/03/2026

Continued to expand our coverage globally, reaching over 170 million American Express-accepting merchant locations worldwide(4)

2025 compensation performance discussion / global merchant locations · Filed 25/03/2026

Service fees and other revenue increased 12 percent and 13 percent for the three and six month periods, respectively, primarily driven by increases in network partnership revenues due to higher network volumes.

GMNS MD&A / network partnership revenue and volume growth · Filed 24/07/2026

Spending on our cards, which is higher on average on a per-card basis versus our network competitors, offers superior value to merchants in the form of loyal customers and larger transactions, and attracts partners to provide value to our Card Members and merchants.

Business / management's comparative spending and merchant-value claims · Filed 06/02/2026

This attracts new Card Members and creates incentives for Card Members to spend more on their cards, attracts merchants and partners to provide additional value to our Membership Model and positively differentiates American Express cards.

Business / management's membership-network reinforcement claim · Filed 06/02/2026

2025 (Millions, except percentages) 2026 2025 2026 2025 Discount revenue $ 10,163 $ 9,361 $ 802 9 % $ 19,675 $ 18,104 $ 1,571 9 % Net card fees 2,862 2,480 382 15 5,614 4,813 801 17 Service fees and other revenue 1,963 1,828 135 7 3,914 3,550 364 10 Total non-interest revenues 14,988 13,669 1,319 10 29,203 26,467 2,736 10 Total interest income 6,607 6,264 343 5 13,272 12,399 873 7 Total interest expense 1,958 2,077 (119) (6) 3,931 4,043 (112) (3) Net interest income 4,649 4,187 462 11 9,341 8,356 985 12 Total revenues net of interest expense $ 19,637 $ 17,856 $ 1,781 10 % $ 38,544 $ 34,823 $ 3,721 11 % Total Revenues Net of Interest Expense Discount revenue increased for both the three and six month periods, driven by increases in billed business of 9 percent and 10 percent, respectively, partially offset by lower average merchant discount rates primarily due to shifts in spend mix by geography and merchant categories.

Consolidated results / revenue growth and lower average merchant discount rates · Filed 24/07/2026

•legal and regulatory developments, which could affect the profitability of our business activities; limit our ability to pursue business opportunities or conduct business in certain jurisdictions; require changes to business practices or governance, or alter our relationships with Card Members, partners, merchants and other third parties, including affecting our network operations and pricing and practices governing merchant acceptance; impact interest income, card fees and rewards programs; exert further pressure on merchant discount rates and our network business, as well as result in an increase in surcharging, steering or other differential acceptance practices; alter the competitive landscape; subject us to heightened regulatory scrutiny and result in increased costs related to regulatory oversight and compliance, litigation-related settlements, judgments or expenses, restitution to Card Members or the imposition of fines or monetary penalties; materially affect capital or liquidity requirements or limit the ability to return capital to shareholders or pay dividends; or result in harm to the American Express brand;

Forward-looking factors / regulatory constraints on pricing and merchant acceptance · Filed 24/07/2026

This includes signing new merchants to accept our cards, agreeing on the discount rate (a fee charged to the merchant for accepting our cards) and handling servicing for merchants.

Business / merchant discount-rate agreements · Filed 09/02/2024

For example, through our OptBlue® merchant-acquiring program, third-party processors contract directly with small merchants for card acceptance on our network and determine merchant pricing.

Business / OptBlue processors determine merchant pricing · Filed 09/02/2024

We also aim to meet the borrowing needs of our customers through a variety of card and non-card financing products, and we charge an annual fee on many of our card products, which helps support the value offered on those products.

Business / annual card fees · Filed 06/02/2026

Operating expense grew at a slower pace than revenue even as we continued to invest in enterprise risk management capabilities and technology to support business growth.

MD&A / operating expense growth below revenue growth · Filed 06/02/2026

During the year, we maintained our CET1 capital ratio within our target range of 10 to 11 percent and returned $7.6 billion of capital to our shareholders in the form of share repurchases and common stock dividends.

MD&A / actual CET1 target maintenance and capital distributions · Filed 06/02/2026

The share repurchases reduce common shares outstanding and generally more than offset the issuance of new shares as part of employee compensation plans.

Capital resources / repurchases relative to employee issuance · Filed 24/07/2026

During the three and six months ended June 30, 2026, we returned $2,887 million and $5,202 million, respectively, to our shareholders in the form of share repurchases of $2,241 million and $3,905 million, respectively, and common share dividends of $645 million and $1,297 million, respectively.

Capital resources / actual first-half 2026 distributions · Filed 24/07/2026

These share repurchase and common share dividend amounts collectively represent approximately 93 percent and 86 percent of net income available to common shareholders during the three and six month periods, respectively.

Capital resources / distributions relative to net income · Filed 24/07/2026

The Company Scorecard for 2025 is based on the following metrics with intra-category metric weightings detailed for transparency below: ​ ​ ​ SHAREHOLDER​ ​ ​ 60% ​ ​ ​ ​ ​ CUSTOMER​ ​ ​ 10% ​ ​ Focuses on performance against our financial objectives and continuously driving value for our shareholders ▪ Revenue Growth (50%) ​ ▪ Earnings per Share (25%) ​ ▪ Return on Equity (25%) ​ ​ ​ ​ Emphasizes the importance of maintaining and building our relationships with customers across our integrated platform ▪ Retention (50%) ​ ▪ Merchant Locations (50%) ​ ​ ​ ​ ​ COLLEAGUE​ ​ ​ 10% ​ ​ ​ ​ ​ STRATEGIC​ ​ ​ 20% ​ ​ Focuses on building, maintaining and motivating a best-in-class team necessary to execute our financial and strategic objectives ▪ Talent Retention (50%) ​ ▪ Culture (50%) ​ ​ ​ ​ Maintains focus on accomplishments related to our long-term goals and sustainable shareholder value creation with specific objectives ▪ Continue to expand leadership in the premium consumer space ​ ▪ Build on our strong position in commercial payments ​ ▪ Build growth momentum in International ​ ▪ Strengthen our global, integrated network ​ ▪ Strengthen our risk and control frameworks to sustainably support the Company’s growth ​ ▪ Uplift our processes and capabilities in support of the Company’s growth to a higher Category Bank ​ ​ ​ RISK MANAGEMENT​ ​ ​ To ensure a strong risk management framework and to maintain a safe and sound operating environment and business practices, the Company’s risk-taking and risk management activities are reviewed in relation to the external economic and competitive environment and the Company’s Risk Appetite Framework.

Executive compensation / actual 2025 scorecard design · Filed 25/03/2026

The design works as follows for each NEO, although implied payout ranges are based on the CBC’s assessment and in no case may the Company performance multiplier exceed 150% of the target: ​ ​ The actual payout is subject to reduction based upon the Compensation and Benefits Committee’s assessment of the Company’s risk management performance during the year.

Executive compensation / payout cap and risk reduction mechanism · Filed 25/03/2026

The elements in the table below describe the LTIA granted for the program, effective in 2026: ​ Element ​ ​ Key Metrics ​ ​ Features ​ ​ PRSUs (100% of award) ​ ​ ▪ 3-year average ROE compared to LTIA Performance Peer Group ​ ▪ 3-year TSR compared to LTIA Performance Peer Group ​ ​ ​ ▪ Three-year cliff vesting period ​ ▪ Vesting tied to three-year relative ROE and TSR performance ​ ▪ 0-150% of target shares awarded ​ ​ Performance Restricted Stock Units (PRSUs) As a financial institution with a loan portfolio and fee income, we consider returns on capital to be an indicator of high performance.

Executive compensation / 2026 PRSU metrics and vesting terms · Filed 25/03/2026

For the 2025 performance year, LTIA was granted in February 2026.

Executive compensation / February 2026 LTIA grant · Filed 25/03/2026

​ ​ ​ ▪ Prohibition of hedging and pledging transactions by directors, executive officers and other senior Management.

Governance highlights / hedging and pledging prohibition · Filed 25/03/2026

​ ▪ All directors are independent except the Chairman.

Governance highlights / director independence · Filed 25/03/2026

​ ▪ Executive sessions of the independent directors led by the Lead Independent Director at each regular in-person Board meeting without Management present.

Governance highlights / independent director executive sessions · Filed 25/03/2026

​ ​ ​ ▪ Proxy access rights. ​ ▪ Annual election of all directors.

Governance highlights / proxy access and annual elections · Filed 25/03/2026

Reviews by us and governmental authorities to assess compliance with laws and regulations, as well as our own internal reviews to assess compliance with internal policies, including errors or misconduct by colleagues or third parties or control failures, have resulted in, and are likely to continue to result in, changes to our products, practices and procedures, restitution to our customers and increased costs related to regulatory oversight, supervision and examination.

Regulatory developments / realized remediation and compliance costs · Filed 24/07/2026

For example, as previously disclosed, we have been engaging with regulators in relation to certain aspects of our anti-money laundering (AML) programs and as a result, we expect to be subject to enforcement action, which could include civil money penalties and lead to further regulatory inquiries.

Regulatory developments / AML review and expected enforcement · Filed 24/07/2026

Net income for the first quarter was $3.0 billion, or $4.28 per share, compared with net income of $2.6 billion, or $3.64 per share, a year ago.

MD&A / first-quarter 2026 net income and EPS · Filed 23/04/2026

T&E spend grew 12 percent (9 percent FX-adjusted), reflecting sustained strength in restaurant and acceleration in airline spend, although we saw airline spend soften in the last few weeks of the quarter with travel disruptions from the Middle East conflict.1 Overall transaction growth of 10 percent for the quarter reflects continued strong engagement from our customers.

MD&A / first-quarter transaction growth and travel disruption · Filed 23/04/2026

Publication history

Publication history
VersionUpdatedCompetitive advantage
519/10/2026narrow
418/10/2026narrow
318/10/2026narrow
218/10/2026narrow
118/10/2026Unavailable

Sources

Research methodology and limitations · What is an economic moat?