Another subpoena blitz in Twitter vs. Musk.

Twitter and Elon Musk sent out another blast of subpoenas on Wednesday as they rev up amid the discovery mode of their legal battle, reports the DealBook newsletter. Among those Mr. Musk subpoenaed were Goldman Sachs and JPMorgan Chase, the banks advising Twitter on its deal to sell itself to Mr. Musk. And Twitter has sent subpoenas to several people in Mr. Musk’s inner circle, as it investigates when — and how — he decided to abandon the deal.

Here’s a look at some of those on Mr. Musk’s side who were put on notice by Twitter.

David Sacks: The venture capitalist and founding chief operating officer of PayPal tweeted that he had received a subpoena asking for more information on his tweets about the deal. Mr. Sacks co-hosted a conference in May at which Mr. Musk expressed one of his first concerns about Twitter’s bots and implied that he might want a deal at a lower price. And Mr. Sacks spoke about the deal on Megyn Kelly’s podcast. A spokeswoman for Mr. Sacks did not have a comment.

Joe Lonsdale: “I have nothing to do with this aside from a few snarky comments, but got a ‘YOU ARE HEREBY COMMANDED’ document notice,” the co-founder of Palantir tweeted. On CNBC in June, Mr. Lonsdale said: “Elon was probably pretty shocked to see they don’t actually know these numbers. And it’s pretty scary to buy something when you don’t know the numbers.” He also noted the broader market decline since the deal was struck, but said he had not discussed this point with Mr. Musk. A spokeswoman for Palantir did not respond to a request for comment.

Founders Fund: This venture firm is led by Peter Thiel, who also helped found PayPal and Palantir and has called himself a good friend of Mr. Musk’s. Mr. Thiel did not invest in Mr. Musk’s Twitter deal, but it is possible Twitter suspects that Mr. Musk spoke to him about it. A spokeswoman for Mr. Thiel did not respond to a request for comment.

Also on the list: The Linda Ye and Robin Ren Family Foundation (Robin Ren is a former top Tesla executive); Tesla and SpaceX, both run by Mr. Musk; Brookfield, which committed equity to the deal; Ken Griffin, the billionaire founder of Citadel; and dozens of others.