Buffett's Secret Metric: Why He Ignores P/E Ratios | MainRatios

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Most investors obsess over price-to-earnings ratios. Buffett built his fortune ignoring them.

The Owner Earnings Framework

Buffett's 1986 letter defined owner earnings as "reported earnings plus depreciation, depletion, amortization, and certain other non-cash charges... less the average annual amount of capitalized expenditures." This explains why he bought KO in 1988 at 15x P/E (seemingly expensive) — its capex was just 3% of revenue versus 8-12% for peers. Today, KO still generates ~$9B annually in owner earnings.

Portfolio Proof: The Data Behind the Philosophy

Ticker	P/E	Owner Earnings Yield	ROIC	Buffett's Entry Year
AAPL	~28	~5.2%	~30%	2016
BAC	~11	~8.1%	~10%	2011
KO	~24	~4.8%	~15%	1988
AXP	~18	~6.3%	~12%	1964
OXY	~12	~9.4%	~8%	2019

Notice the pattern? None were "cheap" on P/E at purchase. AAPL's owner earnings have compounded at ~18% annually since his investment, turning $36B into ~$160B despite its "high" multiple.

The 2008 Case Study: Why Cash is a Position

During the financial crisis, Buffett deployed $25B when others were paralyzed — $5B in GS preferred stock (10% dividend) and $6.5B for WFC warrants. Both deals demanded >20% annualized returns with downside protection. As he wrote in 2009: "When it's raining gold, reach for a bucket, not a thimble." Critics note this approach missed the SaaS boom (CRM, NOW), but his framework intentionally excludes what he can't value.

What Buffett Would Buy Today

His recent moves suggest:

Energy transition plays (OXY stake now ~25%)
Capital-light insurers (BRK.B's float grew to $165B)
Companies repurchasing shares at >10% discounts to intrinsic value (AAPL bought back $550B since 2012)

The risk? This ignores AI disruptors like NVDA — but as he quipped in 1999: "I don't invest in businesses I don't understand."

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