Buffett-style 90/10

Measured historical research · complete provider coverage

This is the returned result for the listed Buffett-style 90/10 proxy allocation and assumptions, not a forecast or recommendation. All expected sessions in this selected window were returned for all 2 instruments; this does not make the window representative of other periods.

Source and provider

Yahoo Finance chart API (yahoo) · data retrieved 2026-10-26

Source instruments

Yahoo Finance VTI history · 753 observations · USD | Yahoo Finance BIL history · 753 observations · USD

As of

2024-12-31 · latest returned market observation

Requested window

2022-01-03 — 2024-12-31 · explicit date range

Observed common window

2022-01-03 — 2024-12-31

Coverage

753 common observations from 753 best-covered instrument observations (100.0%); window coverage 100.0% of 753 expected sessions.

Price basis

Yahoo Finance chart API adjusted close where available, with raw-close fallback where adjusted data was unavailable. The public record does not independently identify which basis was used for each ticker.

Currency limit

Yahoo Finance reports USD for both holdings. Values remain USD-denominated; no currency conversion is applied.

Missing data

Yahoo Finance NYSEArca session calendars in America/New_York yielded the same 753 expected sessions for both holdings. No forward filling is applied, and no missing observations were detected. Returned missing observations: 0.

Calculated result

Total return 24.12% · annualized return 7.51% · maximum drawdown -22.77%. Initial value 100,000 → ending value 124,120.22, in the same unconverted source-market units.

Inputs and assumptions

VTI 90.0% / BIL 10.0%; yearly rebalance; SPY is a data-only reference, with no benchmark comparison shown; initial value 100,000. Annual fee overlay 0 bps; separate expense deduction 0%; inflation adjustment 0%; contributions and withdrawals 0 / 0; cash allocation and yield 0% / 0%; rebalance trading cost 0 bps. No additional cost rates are sourced or assumed; zero does not mean the funds have no expenses.

All expected sessions in this selected window were returned for both instruments. This does not make the window representative of other periods. No relative benchmark-performance claim is made here. Historical observations do not predict future results.

How to read this profile

Warren Buffett publicly described a 90% S&P 500 / 10% short-term government bond example for a trust, not a universal portfolio prescription. These are liquid proxies and do not reproduce his or Berkshire Hathaway’s actual holdings.

This proxy makes the equity-versus-reserve design trade-off visible; whether a reserve meets a person's liquidity needs depends on their circumstances.