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Quote this valuation with its source: Fair value, Potential value and the price at analysis.
FAQ
BRK.B — frequently asked questions
Is Berkshire Hathaway Inc. Class B overvalued?
In our latest published analysis dated 2026-09-21, BRK.B looks meaningfully overvalued. The price recorded at analysis is USD 510 versus our fair value of USD 326; the high endpoint is presented separately as potential value of USD 384. That implies roughly 36.1% downside to fair value at that date.
Our latest published report, analyzed 2026-09-21, gives BRK.B a fair value of USD 326 and a potential value of USD 384. The conclusion is triangulated across multiple valuation models and weighted by reliability for Berkshire Hathaway Inc. Class B's archetype; it is a dated research output, not a live price.
Should I buy BRK.B now?
Our latest published rating for BRK.B, analyzed 2026-09-21, is Sell. Berkshire Hathaway Inc. Class B looks meaningfully overvalued at the analysis-date price of USD 510 versus fair value of USD 326; potential value is USD 384. This is research for educational purposes, not personalized investment advice.
What are the biggest risks for BRK.B?
The dedicated bear-case section in our report analyzed 2026-09-21 documents Berkshire Hathaway Inc. Class B's material risks, evidence, thresholds, and thesis-invalidation conditions. Scenario-specific explanations remain in that section so the report does not repeat or decontextualize them elsewhere.
What is BRK.B's rating?
Our latest published rating for BRK.B, analyzed 2026-09-21, is Sell, with a published moat assessment of 9/10 (Wide). It reflects our fair value of USD 326, the potential value of USD 384, and the price recorded at analysis (USD 510).
Prolonged commercial property and casualty pricing hardening combined with countercyclical deployment of $52.57B in cash into large, cash-generative corporate acquisitions during a broader market downturn, accelerating per-share intrinsic compounding toward Potential value of $383.68.
Main risk
Simultaneous monetary easing lowering short-term rates below 3.50% from the 4.94% risk-free rate and major catastrophe underwriting losses across property and casualty reinsurance subsidiaries.
We rate Berkshire Hathaway Inc. Class B as a Sell. At its report-date price of $509.77 as of September 18, 2026, the stock trades at a 56.4% premium to our Fair value of $325.94, leaving capital exposed to valuation contraction.4
The house rating is Sell. For an ordinary investor, this means capital should not be allocated to new purchases at current market levels, and existing shareholders should consider trimming or exiting their positions to protect accumulated gains.
On the report date of September 18, 2026, the stock traded at $509.77. This price sits 56.4% above our Fair value of $325.94 and 32.9% above our Potential value of $383.68, indicating that the market has priced in operational compounding far beyond what normalized earning power supports.4
The primary risk to our thesis is that central bank interest rate reductions lower yields on cash holdings while catastrophic losses hit insurance operations. Every 100-basis-point drop in short-term interest rates from the 4.94% risk-free rate reduces annual investment income across $52.57B in cash by $3.0B to $3.5B. If clustered catastrophe claims or wildfire charges at Berkshire Hathaway Energy ($25.35B revenue in FY2025) occur simultaneously, forward diluted EPS would compress below $19.50 relative to the FY2026 consensus of $22.25, accelerating downside toward Fair value.1,3,6,7
The main reason the business can outperform is that Berkshire's low-cost insurance float and disciplined underwriting enable it to expand market share during hard insurance pricing cycles without relying on expensive retrocession reinsurance. Supported by $45.97B in operating cash flow and $66.97B in net income, opportunistic redeployment of liquid reserves into high-returning corporate acquisitions or infrastructure assets could lift normalized forward earnings, driving intrinsic value toward our Potential value of $383.68.6
Unmatched Insurance Float and Underwriting Cost Advantage
Berkshire's massive statutory capital base enables it to write volatile catastrophe insurance without costly retrocession, generating durable float and operational cash flows ($45.97B in FY2025).6
Irreplaceable Regulated Infrastructure Networks
Burlington Northern Santa Fe ($23.26B FY2025 revenue) and Berkshire Hathaway Energy ($25.35B FY2025 revenue) provide regulated rate-base growth and monopolistic shipping corridors.7
Fortress Balance Sheet Liquidity
Cash reserves of $52.57B earn steady yields against the 4.94% risk-free rate and provide dry powder for accretive distressed capital allocation.1
House recommendation
We rate Berkshire Hathaway as a Sell because the share price of $509.77 as of September 18, 2026 trades at a 56.4% premium to our Fair value of $325.94, leaving investors vulnerable to valuation compression despite the company's Wide economic moat.4
Company overview
OxyChem operates through five international sales offices and markets its products worldwide through direct sales, sales agents and distributors. OxyChem’s primary customers consist of leading chemical manufacturers, several of which are connected to OxyChem manufacturing sites via pipelines.
IMC competes in the metal cutting tools segment of the global metalworking tools market. Other manufacturing companies such as Kyocera, Mitsubishi, Sumitomo, Ceratizit, OSG, Guhring, Mapal and YG-1 also play a significant role in the cutting tool market.
Under a stressed macroeconomic and operating environment, central bank rate reductions lower float investment yields earned on $52.57B in cash against the 4.94% risk-free rate, reducing annual float income by over $3.0B. Concurrently, severe catastrophe underwriting losses and mounting legal settlements at Berkshire Hathaway Energy ($25.35B revenue) compress normalized forward EPS to $19.50 relative to the FY2026 consensus baseline of $22.25. In this bear outcome, modeled with a 25% scenario weight, intrinsic value falls to $221.71 per share, representing 56.5% downside from the share price of $509.77 as of September 18, 2026.
Berkshire Hathaway possesses a Wide economic moat supported by three distinct structural advantages: a low-cost insurance float franchise, efficient scale in continental rail and regulated energy infrastructure, and intangible acquisition reputation. Unlike peers that rely on expensive external reinsurance, Berkshire's massive balance sheet enables its property and casualty businesses to underwrite volatile risks and maintain underwriting discipline across pricing cycles.
In regulated infrastructure, Burlington Northern Santa Fe and Berkshire Hathaway Energy control critical physical assets that benefit from natural monopolies and regulatory rate bases, generating $23.26B and $25.35B in FY2025 revenue respectively. These capital-intensive networks possess formidable barriers to entry, as constructing duplicate rights-of-way or power grids is economically prohibitive.
The company's non-insurance operations span diversified industrial manufacturing ($72.83B revenue), wholesale distribution via McLane ($50.18B revenue), and travel centers ($41.88B revenue). Backed by $52.57B in cash and $45.97B in operating cash flow, this structure provides an enduring competitive position.
The highlighted cell is Fair value when every assumption sits at its base level ($325.94). Each row and column shows what Fair value becomes when one assumption moves.
Free cash flow to the firm stays positive in the first projected year at $22.6B after modeled reinvestment of $2.1B, with terminal value at 57.0% of enterprise value. A sudden drop in free cash flow is not projected unless capital spending relative to , reinvestment, or resets materially.
An earnings beat driven by disciplined underwriting margins and strong rail and energy profitability demonstrates robust operational execution, though the shares would remain above Fair value of $325.94 relative to $509.77.
Trigger: Quarterly operating performance matching consensus estimates across subsidiaries
Inline operating performance confirms that earnings power tracks base assumptions, leaving the shares trading at an elevated premium to Fair value of $325.94 compared to $509.77.
Miss
Maintain Sell; Re-assess catastrophe reserve adequacy and verify conversion across non-insurance subsidiaries.
Capex increased from $19.41B in FY2023 to $18.98B in FY2024 and $20.93B in FY2025, keeping capex-to-depreciation elevated at 1.55x compared to the industry capex-to-revenue benchmark of 0.55 and capex-to-depreciation benchmark of 0.24.6
Bull cycle
An upcycle characterized by sustained hard insurance pricing, resilient rail freight volumes, and accretive capital deployment of cash into distressed acquisitions drives consolidated earnings growth and accelerates book value compounding.
Bear cycle
A downcycle characterized by large catastrophe reinsurance claims, declining short-term interest rates on cash holdings, and escalated wildfire litigation liabilities at BHE compresses group earnings and limits immediate free cash flow conversion.
§11 Position management
Sizing
0%
Given the house Sell rating and the share price of $509.77 as of September 18, 2026 trading at a 56.4% premium to the Fair value midpoint of $325.94, an allocation of 0% is recommended. Capital should be rotated out of the position until valuation re-aligns with underlying fundamentals.4
Risk
Risk management requires strict price discipline and adherence to capital allocation criteria. Despite Berkshire's fortress balance sheet with $52.57B in cash and Wide economic moat, holding shares at $509.77 exposes investors to valuation compression toward Fair value of $325.94. Exposure should be systematically eliminated.
Berkshire pays no regular dividend, and capital is exposed to severe downside multiple contraction from current levels of $509.77 if central bank rate cuts compress yields on cash reserves of $52.57B.4,6
Institutional / Tactical Investor
Avoid
Tactical risk-reward is heavily skewed negative with -36.06% downside to Fair value. Risk managers should liquidate or hedge existing long exposure and rotate into assets with superior valuation support.
§14 Final recommendation
Action
Sell
We recommend an orderly exit of long positions in Berkshire Hathaway Class B shares at the report-date price of $509.77 as of September 18, 2026, which trades at a 56.4% premium to our Fair value of $325.94.4
While Berkshire possesses an exemplary Wide economic moat and fortress liquidity of $52.57B in cash, current trading multiples discount future compounding beyond what normalized forward earnings can justify.
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Sources
The records this analysis drew on, as they stood when it was run.
The Bear scenario models a severe downside path driven by simultaneous catastrophe underwriting losses across reinsurance subsidiaries, rapid policy rate cuts compressing float investment yields, and escalating wildfire litigation provisions at Berkshire Hathaway Energy. While intrinsic value in this outcome contracts below the house Fair value of $325.94, Berkshire's fortress balance sheet and conservative capital structure prevent solvency distress.
Ways this thesis can break
Terminal P/E multiple contraction driven by succession uncertainty and peer discount convergence
Peers like ACGL trade at forward P/E of 9.94x and Citigroup at 10.23x. If Berkshire's forward multiple of 22.97x contracts 20% below the 13.0x terminal assumption toward 10.4x, forward earnings valuation drops directly by 20%.2,4
FV impact
-20%
Terminal multiple 20% lower
Trigger
Within 24 months
Severe multi-peril underwriting catastrophe loss combined with rapid monetary easing
Under the analyst's bear case, catastrophe underwriting losses and interest rate reductions on $52.57B cash compress EPS below $19.50 relative to FY2026 consensus of $22.25 and FY2027 of $22.19, producing a 12.8% reduction in forward earnings fair value.3,6
FV impact
-12.8%
The analyst's bear scenario path and multiple as the base case
Trigger
Within 12 months
Sustained utility liability provisions and railroad margin degradation
Escalating wildfire liabilities at BHE ($25.35B revenue) and cost inflation at BNSF ($23.26B revenue) push consolidated non-insurance operating margins 300 bps below the 12.09% house forecast baseline toward 9.0%, reducing operating earnings.7
FV impact
0%
Operating margin 3 points lower throughout
Trigger
Within 36 months
Early-warning signals to monitor
The five developments that would weaken our investment case.
01
consolidated_operating_margin
A contraction in operating margin below 20.0% relative to the FY2025 level of 35.40% on $247.24B revenue would signify severe pricing competition or catastrophe claims impairing underwriting discipline.
Forward diluted EPS dropping below $19.50 compared to FY2026 consensus of $22.25 and FY2027 of $22.19 indicates substantial float yield erosion or catastrophe loss realization.
Capex-to-depreciation exceeding 1.80x relative to FY2025 capex of $20.93B would indicate that energy grid and rail investments are absorbing cash inefficiently without commensurate rate-base additions.
Current:1.55x in FY2025
Alert if> 1.80x
04
short_term_risk_free_rate
A decline in policy rates below 3.50% from the 4.94% risk-free rate reduces annual investment income across $52.57B in cash by approximately $3.0B-$3.5B per 100 bps reduction.
Current:4.94% as of September 21, 2026
Alert if< 3.50%
05
bhe_litigation_charges
Cumulative wildfire provisions exceeding $3.0B at Berkshire Hathaway Energy ($25.35B revenue in FY2025) would directly impair non-insurance equity value.
While Berkshire's competitive moat remains wide and durable, economic moat durability does not insulate investors from valuation risk. With shares trading at $509.77 as of September 18, 2026 compared to the house Fair value of $325.94, the market has priced in sustained compounding well above normalized operational earnings power.
01Cost Advantage — Scale and capital depth allow Berkshire's insurance operations to write catastrophe risk without purchasing expensive retrocession reinsurance, supporting a FY2025 operating margin of 35.40% on $247.24B revenue compared to specialty peer ACGL at 26.59%.Wide
02Efficient Scale — Irreplaceable rights-of-way and distribution infrastructure underpin Burlington Northern Santa Fe ($23.26B FY2025 revenue) and Berkshire Hathaway Energy ($25.35B FY2025 revenue), assets that cannot be economically replicated.Wide
03Intangible Assets — Berkshire's reputation as a preferred permanent home for acquired operating companies supports bilateral deal flow and autonomous management across manufacturing businesses ($72.83B FY2025 revenue) and service/retailing subsidiaries ($33.75B FY2025 revenue).Moderate
Regulated capital expenditures at BHE and BNSF convert into rate-base and network efficiency gains
Under the Base scenario, assigned a 55.0% probability, intrinsic value is estimated at $325.94, implying an expected return of -36.1% from $509.77. This path assumes normalized underwriting profitability, steady freight and energy volume, and gradual capital reinvestment. Disconfirmation would occur if underwriting margins deteriorate significantly or if interest rate cuts accelerate float yield decline before FY2027.
Accelerated redeployment of cash reserves into high-yielding productive acquisitions
Commercial property and casualty insurance pricing sustains elevated underwriting margins
Regulatory settlements at BHE limit incremental wildfire liability charges
Under the Bull scenario, carrying a 20.0% probability, intrinsic value reaches Potential value of $383.68, reflecting an expected return of -24.7% compared to $509.77. This outcome requires prolonged commercial insurance rate hardening, accelerated capital deployment of liquidity into higher-yielding operating acquisitions, and resolution of utility liabilities without significant equity impairment.
Earnings quality is supported by genuine operational cash conversion across operating subsidiaries, with operating cash flow consistently covering capital expenditures. Reported net income reflects mark-to-market equity fluctuations under accounting standards, making operating earnings a more reliable gauge of underlying operational performance than headline GAAP net income.
Metrics to watch into the print
01
Metric:
Property and Casualty Underwriting Discipline and Combined Ratio
CurrentUnderwriting profitability remains favorable across commercial lines, benefiting from supportive pricing conditions.
Why it matters
Underwriting gains generate non-cost float that fuels investment compounding, while underwriting losses erode profitability and consume capital.
02
Metric:
Float Investment Income and Short-Term Rate Environment
In FY2025, operating cash flow reached $45.97B, which funded $20.93B in capital expenditures and generated $25.04B in free cash flow. Free cash flow conversion remained resilient despite elevated multi-year infrastructure commitments, while cash balances of $52.57B ensure exceptional solvency.5,6
Management maintains a disciplined capital allocation strategy focused on internal reinvestment in regulated energy and rail networks ($20.93B capex in FY2025), selective bolt-on acquisitions across manufacturing subsidiaries ($72.83B revenue), and opportunistic share repurchases ($0 in FY2025 versus $2.92B in FY2024 and $9.17B in FY2023), pausing buybacks when share prices exceed intrinsic value.
Stable returns on equity reflect durable float-funded economics and regulated asset compounding, consistently covering the group's cost of capital across cycles.
Berkshire continues to fund capital-intensive utility and rail commitments entirely through internal cash flows without incurring dilutive external financing.
Underwriting scale drives superior operational margins compared to peers
Berkshire generated FY2025 revenue of $247.24B with an operating margin of 35.40%, outperforming specialty peer ACGL at 26.59%.
Low-cost insurance float and scale advantages sustain industry-leading profitability across changing property and casualty pricing cycles.
Berkshire Hathaway Inc. Class B (BRK.B) trades at 23.0x forward earnings against a peer median of 10.6x. Its EV/EBITDA of -1.8x compares with a peer median of 6.0x. The comparison uses 4 peers: Bank of America Corporation, Citigroup Inc., American Express Company and Arch Capital Group Ltd., as of 2026-09-20 to 2026-09-21.
Secular trends
Trend
Impact
Note
Property and Casualty Commercial Insurance Pricing Discipline
positive
Favorable underwriting pricing cycles across commercial lines support healthy combined ratios and bolster float generation across primary and reinsurance units.
Regulated Utility Grid Modernization and Wildfire Hardening
neutral
Substantial capital deployment into renewable energy and grid resilience expands regulated rate bases but requires heavy upfront capital and exposes operations to regulatory lag.
Central Bank Policy Rate Normalization and Yield Compression
negative
Anticipated interest rate easing lowers returns on large short-term cash holdings, reducing investment earnings relative to peak rate environments.
Positioning
Berkshire is positioned as a uniquely diversified conglomerate combining an unmatched non-cost insurance float engine with essential, highly cash-generative infrastructure and industrial subsidiaries. This structure enables self-funded countercyclical capital allocation during market dislocations.
Level
Action
Why
$325.94 (Fair value midpoint)
Neutral observation / Re-evaluate stance
At the Fair value midpoint of $325.94, the stock would reflect normalized forward earnings power at moderate Ke of 7.73%.
Consider initiating gradual position
Exit tranches
Level
Action
$509.77 (Analysis price)
Exit / Liquidate remaining long exposure
$537.74 (52-week high)
Accelerate complete position exit
Quarterly checkpoints
Metric
Threshold
Action
Property and casualty combined ratio
> 98.0% over two consecutive quarters
Downgrade operating earnings forecast and lower Fair value to reflect impaired underwriting profitability.
Not every cited input appears here: internal calculations and intermediate model outputs have no external record, and some citations could not be matched to one.
