A potential round of financing by Uber Technologies Inc. valuing it as high as $40 billion would make the mobile car-booking company more valuable than three-quarters of Standard & Poor’s 500 Index members.

Uber is raising at least $1 billion, and T. Rowe Price Group Inc. is in discussions to be a new investor, people with knowledge of the situation said. Existing investor Fidelity Investments is also set to participate in the funding.

A valuation of $35 billion to $40 billion would more than double Uber’s $17 billion value from a June financing, which was a record for a U.S. technology startup in a round of direct investment.

If Uber completes the financing, that could put it above:

• Tesla Motors Inc., with a market value of $31 billion
• Netflix Inc., at $21 billion
• Alcoa Inc., at $20 billion
• Charles Schwab Corp., wealth manager worth $37 billion
• Delta Air Lines Inc. and American Airlines Group Inc., with market caps of $37 billion and $32 billion, respectively
• Software maker Adobe Systems Inc., valued at $36 billion
• Kraft Foods Group Inc. at $35 billion, and General Mills Inc., $31 billion
• Tobacco companies Reynolds American Inc. at $35 billion, and Lorillard Inc., $23 billion
• Health insurers WellPoint Inc., worth $34 billion, Aetna Inc., $30 billion, and Cigna Corp., $27 billion
• Yum! Brands Inc., with a market cap of $33 billion, and Chipotle Mexican Grill Inc., $20 billion
• Viacom Inc., valued at $31 billion
• Retailers Macy’s Inc., worth $23 billion, and Gap Inc., $17 billion
• Marriott International Inc. and Wynn Resorts Ltd., hotel operators with market caps of $22 billion and $18 billion, respectively.