A couple in their 30s who hit a net worth of $1 million have more than 95% of their stock portfolio invested in 3 index funds and the rest in one individual stock. Take a look at their portfolio.

• Brennan and Erin Schlagbaum paid off more than $300,000 of debt and hit a seven-figure net worth.
• Once they were debt-free, they got serious about investing and went all-in on index funds.
• The couple now has a net worth of nearly $2 million. Most of their money is in three index funds.

Brennan and Erin Schlagbaum like to keep things simple when it comes to stock-market investing — and their approach has worked for them so far.