Today, two things happened:
1. Apple split its stock in a 4:1 ratio.
You owned a single share of Apple yesterday at $500. Today, you own 4 shares at an initial value of $125.
2. Tesla split its stock in a 5:1 split.
Yesterday, you owned a single share of Tesla valued at $2,200 and today, you will own 5 shares valued at $440/each.