The first time the public will see a complete cross-Musk related-party transactions exhibit it will be in SpaceX's S-1, filed sometime between Monday May 18 and Friday May 22, in the public window that follows the confidential S-1 SpaceX submitted on April 1. By then the disclosure framework will already exist, because Tesla's 10-K/A on April 30 wrote it. [1]

That filing — an amended 10-K covering fiscal 2025 — disclosed $573.4 million of revenue Tesla earned from related parties controlled by Elon Musk. The bulk, $430.1 million, came from xAI for Tesla Megapack deliveries to the Memphis Colossus 2 data center and the Bay Area training cluster. The remainder, $143.3 million, came from SpaceX, which took delivery of 1,279 Cybertrucks in the fourth quarter for the Starbase fleet. [2] The line items themselves are unremarkable. The aggregate is the disclosure event. The paper's Friday note framed the S-1 as inheriting the related-party set Tesla had already printed; the filing window now opens in eight days.

What Tesla's 10-K/A printed was the quarterly proof that Musk runs an unincorporated holding company. The four entities — Tesla, SpaceX, xAI, the Boring Company — and the smaller satellites — Neuralink, X — operate as a single procurement web in which each company is meaningfully both a customer and a vendor of at least one other. The web is not new. The disclosure of the web at the granularity Tesla provided last week is.

SpaceX's S-1 will inherit the framework Tesla built. Securities counsel familiar with the filing describe the related-party exhibit as the disclosure work item that has consumed the most time over the past six weeks. SEC rules require the exhibit to list every transaction over $120,000 between the issuer and any related party. The related parties of SpaceX include Musk, every entity he controls, and every entity in which he holds 5 percent or more. The list is long. The dollar values are larger than the comparable line items in any S-1 of the past decade.

The merger that converted xAI's preferred shares into SpaceX Class A stock — completed March 12 — adds a dimension Tesla's 10-K/A did not have to address. xAI is no longer an independent company for SpaceX disclosure purposes; its preferred holders are now SpaceX equity holders. [3] Whether the S-1 treats the converted xAI position as a related-party flow or as an internal allocation is a question with no settled answer. The conversion ratio — every $1 of xAI preferred became $0.36 of SpaceX Class A — is itself a public statement of how the SpaceX board priced xAI's equity inside its own framework.

The undisciplined-cohort frame is the one this filing tests. Apple recycles cash through buybacks. Berkshire allocates through a single audit committee. Pfizer conserves through zero-buyback FY26 guidance. SpaceX, in the upcoming S-1, will ask public markets to underwrite a related-party network whose dollar values exceed the entire equity capital of most of the public companies inside it.

What the related-party exhibit will tell readers is something the Tesla 10-K/A could not. Tesla disclosed only the revenue Tesla earned from Musk-controlled counterparties. SpaceX's exhibit will disclose every flow in both directions — what SpaceX paid Tesla for Megapacks and Cybertrucks, what SpaceX paid xAI for compute, what Boring Company paid SpaceX for tunnel-boring work, what X paid for Starlink uplink, what Neuralink paid for anything. The list reads as the balance sheet of an unincorporated holding company.

The 1,279 Cybertrucks SpaceX took in Q4, without context, reads as a line item. With context — those vehicles replaced Ford F-150s in the Starbase fleet on a one-for-one basis, negotiated at a discount inside the related-party framework Tesla disclosed — it reads as the small unit of the larger disclosure problem. The S-1 will make every line of that math visible.

-- THEO KAPLAN, San Francisco