S&P 500 What If Invested - FAQ

Question 1

What is S&P 500 (SPX)'s all-time high (ATH) and all-time low (ATL)?

Accepted Answer

S&P 500 (SPX)'s all-time high (ATH) was $7,609.77 on Jun 2, 2026. The all-time low (ATL) was $4.40 on Jun 1, 1932.

Question 2

What if you invested $1,000 in S&P 500 (SPX) for maximum profit?

Accepted Answer

In hindsight, the optimal buy-and-sell pair for S&P 500 (SPX) was buying on Jun 1, 1932 at $4.40 and selling on the subsequent peak ($7,609.77 on Jun 2, 2026). That trade would have turned $1,000 into $1,729,493.18 — a return of +172,849.32% (1,729 times). This is the maximum theoretical return from a single round-trip trade in this asset's price history, not a recommendation.

Question 3

What are S&P 500 (SPX)'s best buy and sell dates for maximum profit?

Accepted Answer

Computed in retrospect, the optimal buy date for S&P 500 (SPX) was Jun 1, 1932 at $4.40, and the matching sell date was Jun 2, 2026 at $7,609.77. Held over that exact window, the position would have returned +172,849.32% (1,729 times). The "best" dates are identified after the fact and could not have been known in advance.

Question 4

What was S&P 500 (SPX)'s maximum drawdown?

Accepted Answer

S&P 500 (SPX)'s worst peak-to-trough decline was -86.19% (price fell to 14% of the peak). Peak: $31.86 on Sep 16, 1929. Trough: $4.40 on Jun 1, 1932. A $1,000 position bought at the peak would have shown a paper loss down to $138.10 at the trough — this would only have become a realized loss if the investor sold at that low. Drawdown measures mark-to-market risk, not realized return.

Question 5

What if you bought S&P 500 (SPX) at inception?

Accepted Answer

A $1,000 investment in S&P 500 (SPX) at inception ($17.66 on Dec 30, 1927) would be worth $424,720.84 as of Jun 18, 2026. Historical return: +42,372.08% (424.7 times). Latest closing level: $7,500.57.

Question 6

What if you invested $1,000 in S&P 500 (SPX) 5 years ago?

Accepted Answer

A $1,000 investment in S&P 500 (SPX) 5 years ago ($4,166.45 on Jun 18, 2021) would be worth $1,800.23 as of Jun 18, 2026. Historical return: +80.02% (1.80 times). Latest closing level: $7,500.57.

Question 7

What if you invested $1,000 in S&P 500 (SPX) 10 years ago?

Accepted Answer

A $1,000 investment in S&P 500 (SPX) 10 years ago ($2,071.22 on Jun 17, 2016) would be worth $3,621.33 as of Jun 18, 2026. Historical return: +262.13% (3.62 times). Latest closing level: $7,500.57.

Question 8

What if you invested $1,000 in S&P 500 (SPX) 20 years ago?

Accepted Answer

A $1,000 investment in S&P 500 (SPX) 20 years ago ($1,251.54 on Jun 16, 2006) would be worth $5,993.07 as of Jun 18, 2026. Historical return: +499.31% (5.99 times). Latest closing level: $7,500.57.

S&P 500: What If You Had Invested?

Historical return extremes for S&P 500 (SPX) from 1927 to 2026

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Scenario	Return	Start date	Start price	End date	End price	$1,000 becomes
Max profitMore info about Max profit	+172,849%	Jun 1, 1932	$4.40	Jun 2, 2026	$7,609.77	$1,729,493.18
Max drawdownMore info about Max drawdown	-86.19%	Sep 16, 1929	$31.86	Jun 1, 1932	$4.40	$138.10
Return since InceptionMore info about Return since Inception	+42,372%	Dec 30, 1927	$17.66	Jun 18, 2026	$7,500.57	$424,720.84