SoftBank Group Corp. is assembling a rescue financing plan for WeWork that may value the office-sharing company below $8 billion, according to people familiar with the discussions.

The new figure is a fraction of the $47 billion valuation the startup commanded as recently as January. The talks are fluid and the terms could change, said the people, who requested anonymity because the discussions are private.

WeWork, reeling since it scrapped its initial public offering, has been considering dueling plans from SoftBank and JPMorgan Chase & Co. to shore up its finances before it runs out of cash as early as next month. The company's board could make a decision as soon as this weekend, according to some of the people familiar with the situation.