Why is Palo Alto Networks reporting earnings Friday afternoon? The strange timing draws speculation.

Palo Alto Networks Inc. has Wall Street wondering why the cybersecurity company decided to report earnings and hold its conference call after the close of markets on a Friday.

While Palo Alto Networks’ PANW earnings have bounced around the weekly calendar in recent quarters, it’s unusual for companies in the S&P 500 index SPX to post results on a Friday after the closing bell.

The…