Key Takeaways T-Mobile shares declined after Japanese investment firm SoftBank reportedly sold shares of the company's stock.SoftBank raised $4.8 billion in the deal but sold the shares at a discount to T-Mobile's closing price Monday,

SoftBank Group Corp. raised around $4.8 billion through a sale of T-Mobile US Inc. shares, a move that helps fund the Japanese company’s grandiose plans for artificial intelligence.Most Read from BloombergSecurity Concerns Hit Some of the World’s ‘Most Livable Cities’As Part of a $45 Billion Push,

T-Mobile stock is down over 4% after SoftBank reportedly sold $4.8 billion in shares at a discount. This major share sale by a key investor is contributing significantly to the stock's decline Tuesday.