Elon Musk's X is gaining value, Fidelity says

• The investment giant is holding the shares at a 58% discount, per the disclosure Wednesday.
• Fidelity helped finance Elon Musk's purchase of Twitter for $44 billion last October, and either marked down the stock or held it flat during the subsequent six months.

Behind the scenes: Despite being an investor in the privately held business, Fidelity doesn't necessarily have much, if any, insider information on the company's financial situation.

• It remarks all of its private company shares on a lagging monthly basis without explaining its calculations. Other holders of X shares value the company differently.
• In terms of publicly traded comps, Meta stock rose 11% in July while Snap shares dropped more than 4%.