Why I Put Everything in the S&P 500 and Never Sold — Even in a Crash

My entire investment strategy fits in one sentence: buy S&P 500 index funds every month, and never sell.

That's it. No individual stocks. No crypto. No options. No "I heard about this biotech company." Eight years of that one sentence built the majority of my $750,000 net worth, and I have never once deviated from it.

People hear this and assume I'm either lying or lucky. I'm neither. I'm just willing to be bored.

Why the S&P 500

When you buy an S&P 500 index fund, you're buying a slice of the 500 largest companies in America — Apple, Microsoft, the banks, the railroads, the grocery chains. You are not betting on one CEO or one product. You're betting that American business as a whole keeps solving problems and making money.

Here's the fact that ended the debate for me: over any 20-year period in history, the S&P 500 has never lost money. Through the Great Depression, world wars, oil shocks, dot-com collapse, 2008 — pick the worst possible 20-year window, and a patient investor still came out ahead. The average annual return sits around 10%.

I worked as a data analyst before the Army. I learned to trust base rates over stories. Every stock picker has a story. The index has a base rate.

The math that requires no genius

$500 a month at 10% average annual returns is about $598,000 after 25 years. You contributed $150,000 of that. Compounding built the other $448,000 while you slept, deployed, PCS'd, and lived your life.

You don't need to find the next Amazon. You need to own everything, automatically, for a long time. The strategy is boring. The result is not.

The part everyone gets wrong: never selling

Buying index funds is easy. Everyone's a long-term investor in a bull market. The strategy is decided in the crashes — and I've been tested three times.

Late 2018, the market dropped almost 20% in three months. I was still early in my journey, and watching months of savings evaporate on a screen made my stomach hurt. I bought my regular amount anyway.

March 2020, COVID. The S&P 500 fell 34% in five weeks. The news said the economy was ending. People at work were moving everything to cash, and they sounded smart doing it. I bought my regular amount anyway. The market recovered in five months, and every share I bought in that hole is up massively.

2022, the slow bleed — down 25% over an entire year, with inflation eating cash on the sidelines. No dramatic crash, just month after month of red. That one tested patience instead of courage. I bought my regular amount anyway.

Here's what those three crashes taught me: the enemy was never the market. The enemy was my own hands. Every crash in history looks like an obvious buying opportunity in hindsight and feels like the end of the world in real time. The people who lost money in 2020 didn't lose it to the virus — they lost it by selling in March and buying back in August, higher than they sold.

I never sold a single share. Not one, in eight years. That sentence did more for my net worth than any amount of intelligence could have.

"But what about—"

Crypto? I watched coworkers make fortunes on paper and give it all back. I don't invest in things whose value depends on finding a more excited buyer.

Individual stocks? Some people win. Most don't, including most professionals — the majority of actively managed funds trail the index over 15 years. I refuse to bet my family's freedom on being the exception.

Timing the market? Missing just the 10 best days in a decade cuts your returns roughly in half — and the best days cluster right next to the worst ones, exactly when scared money is sitting out.

How to run this system

In the TSP, this strategy is the C Fund — it tracks the S&P 500 directly. In your Roth IRA or brokerage, it's VOO, VFIAX, or FXAIX. Set the contribution to automatic, buy on payday every payday, and delete the app if checking it makes your thumb itch.

This is Step Four of the five-step system I used from $0 to $750K. It works precisely because it doesn't depend on you being brilliant, brave, or lucky — only consistent.

Boring on purpose. Relentless by design. Never sold, never will.