Is VOO the same fund as SPY?

Every company we can see inside them is held by both, at the same weight to the decimal — one basket under two names. Their daily closing prices still differ a little: the two listings are quoted at different moments, in different volumes.

Do VOO and SPY fall together?

Measured from 1993-01-29 to 2026-11-06, the worst fall on record was 55% for VOO and 55% for SPY. Held half and half, the worst fall was 55%. Over the same window, the two swing like a single bet.

What changes if both are held?

A half-and-half mix had volatility 18% over this window, against 18% for VOO and 19% for SPY, and its worst fall was 55%. Inside that mix, SPY carries 50% of the risk for half of the money.

How are these figures measured?

From daily closing prices supplied by Yahoo Finance, over 1993-01-29 to 2026-11-06 — 8,502 trading days, in USD — by the same engine that serves the app. Every figure describes what has already happened: nothing here forecasts returns or losses, and nothing here is advice.

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Compare two funds

How much of two funds is the same company, and how far each one fell.

How much of VOO and SPY is the same?

Every company we can see inside them is held by both, at the same weight to the decimal: one basket, not two.

Daily prices, 29 Jan 1993 to 6 Nov 2026. What happened, not a forecast.

Measure this pair

Measured over 33 years of daily prices: the same holdings, in the same proportions, under two names.

Measured on 2026-11-06

The companies both of them hold

Company	Share of a half-and-half mix	Through
NVDA	7.5%	VOO 3.8% · SPY 3.8%
AAPL	6.6%	VOO 3.3% · SPY 3.3%
GOOGL	5.8%	VOO 2.9% · SPY 2.9%
MSFT	4.3%	VOO 2.1% · SPY 2.1%
AMZN	3.6%	VOO 1.8% · SPY 1.8%
AVGO	2.8%	VOO 1.4% · SPY 1.4%
MU	2.0%	VOO 1.0% · SPY 1.0%
META	1.9%	VOO 1.0% · SPY 1.0%

Overlap is counted company by company: the smaller of its two weights, added up. This measurement names the companies behind 99% of the money; the rest is out of its sight. The share above is what is shared within that part: it is a floor, never the total overlap.

Their daily closing prices do not match exactly (98% of daily moves in step, 100% weekly). That is the two listings being quoted at different moments and in different volumes, not the funds holding different things.

The worst falls on record

Holding	Worst fall	Volatility
VOO	55%	18%
SPY	55%	19%
Both, half and half	55%	18%

Measured on the same window for all three rows, so they can be read against each other. A fall is peak to trough on daily closes.

Where the risk sits in a half-and-half mix

Holding	Money	Risk	Ratio
SPY	50%	50%	1.01
VOO	50%	50%	0.99

The reading, in full

PORTFOLIO: VOO + SPY
1993-01-29 to 2026-11-06 · 8,502 trading days · USD

2 holdings.
Together they swing like a single bet.

SPY carries 50% of the risk on its own.
Volatility 18% · worst fall on record 55%.
Risk 19% → 14% over the last year, mostly because the holdings themselves got quieter.

Descriptive. No forecast, no advice. Every figure above is measured over the window named at the top.
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Questions people ask about this pair

Is VOO the same fund as SPY?: Every company we can see inside them is held by both, at the same weight to the decimal — one basket under two names. Their daily closing prices still differ a little: the two listings are quoted at different moments, in different volumes.
Do VOO and SPY fall together?: Measured from 1993-01-29 to 2026-11-06, the worst fall on record was 55% for VOO and 55% for SPY. Held half and half, the worst fall was 55%. Over the same window, the two swing like a single bet.
What changes if both are held?: A half-and-half mix had volatility 18% over this window, against 18% for VOO and 19% for SPY, and its worst fall was 55%. Inside that mix, SPY carries 50% of the risk for half of the money.
How are these figures measured?: From daily closing prices supplied by Yahoo Finance, over 1993-01-29 to 2026-11-06 — 8,502 trading days, in USD — by the same engine that serves the app. Every figure describes what has already happened: nothing here forecasts returns or losses, and nothing here is advice.

What this does not say

Every figure is measured on past daily prices over the window below. It is not a forecast of returns or losses.
VOO before 2010-09-09 is measured on the daily moves of VFINX, an older fund on the same index (S&P 500), from 1990-01-02. Those years describe the older fund, not VOO's own record. Older crises may still lie outside the window.
The overlap is measured through published holdings only, and is a floor: the real figure is at least this, and cannot be smaller.
Which of two funds to hold depends on things not measured here — what you already own, costs at your broker, and your own tax position.

Measure it with what you actually hold

Change the split, add the rest of your portfolio, see what the pair does inside it: same engine, nothing saved on our side.

Measure this pair

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Build a portfolio with these twoBoth on the measure page, half and half: change them into yours.Another pairEvery comparison measured here.

Measured 1993-01-29 to 2026-11-06 over 8,502 trading days, in USD, from Yahoo Finance prices. Descriptive: this page reports what these two funds have done and how much of them is the same holding. It does not forecast returns or losses, it does not say which to hold, and it is not advice. How every figure is measured. Terms and privacy: /terms. If a figure looks wrong: [email protected].