Tradermath logoBrainteaser - Mixed Labels

Mixed Labels
You're an intern at a top quantitative hedge fund. On your first day, you find a set of four portfolios on your desk, but unfortunately, the labels have been mixed up:

One labeled "Equities"
One labeled "Bonds"
One labeled "Equities and Bonds"
One labeled "High Dividend Equities"
You're informed of the following:

All the portfolios are labeled incorrectly.
The "High Dividend Equities" portfolio has stocks that offer dividends so high that just by skimming the first few entries of the portfolio, you can easily identify them.
What's the fewest number of portfolios you need to skim through to correctly relabel each of the portfolios?