Principal Financial Group reduced its stake in CoStar Group by 5.7%. The firm sold 1,057,296 shares. Principal Financial Group retains a 4.14% ownership stake.

CEO Andrew C. Florance purchased 71,430 shares. The transaction totaled approximately $2.51 million.

CoStar reported first-quarter earnings that exceeded expectations. The company issued guidance for the next quarter and the full year. The board authorized a $1.5 billion stock repurchase program.