Elon Musk’s titles span six companies and, until mid-2025, a federal advisory post. At Tesla he is Technoking of Tesla and Chief Executive Officer. At SpaceX he is Founder, Chief Executive Officer, and Chief Engineer. At X he is Executive Chairman and Chief Technology Officer. He leads xAI, co-founded Neuralink, and founded The Boring Company. He also served briefly as Senior Adviser to the President in connection with the Department of Government Efficiency. Some of these labels are unconventional, but under securities and tax law what he is called matters far less than what he does.
Tesla: Technoking and CEO
Musk carries two active titles at Tesla, both listed in the company’s 2025 proxy statement: Technoking of Tesla and Chief Executive Officer.1U.S. Securities and Exchange Commission. Tesla Inc. 2025 Proxy Statement The Technoking designation first appeared in a Form 8-K filed on March 15, 2021. That filing was explicit that Musk would keep his CEO role, so the new title sat on top of the existing one rather than replacing it.2U.S. Securities and Exchange Commission. Tesla Inc. Form 8-K
He used to hold a third title at Tesla: Chairman of the Board. He gave it up as part of a 2018 settlement with the SEC over fraud charges tied to his tweets about taking Tesla private. The settlement barred him from reclaiming the chairmanship for three years, and he and Tesla each paid $20 million in penalties. Tesla was also required to appoint two new independent directors and set up a committee to oversee Musk’s public communications.3U.S. Securities and Exchange Commission. Elon Musk Settles SEC Fraud Charges
SpaceX: Founder, CEO, Chief Engineer
At SpaceX, Musk holds three titles: Founder, Chief Executive Officer, and Chief Engineer. The Chief Engineer designation is the one that carries the most operational weight. Employees and outside observers describe the role as substantive, reflecting direct involvement in rocket design and mission architecture rather than a symbolic nod to his engineering background.
SpaceX is privately held, so its officer titles are established through internal governance documents and board resolutions rather than SEC filings. Private companies file no proxy statements, annual reports, or 8-Ks, which is why the public trail for SpaceX titles is thinner than Tesla’s.
X: Executive Chairman and CTO
Musk’s role at X has shifted more than once since he acquired the company, then called Twitter, in October 2022. He first ran the company as CEO through the turbulent early months. In May 2023 he announced that he was moving to Executive Chairman and Chief Technology Officer, focusing on product design, software, and system operations. Linda Yaccarino stepped in as CEO around that time and ran day-to-day operations for roughly two years before leaving in July 2025.
Because X is private, none of these transitions triggered SEC filings. They were announced through posts on the platform and press communications.
xAI, Neuralink, and The Boring Company
Musk holds founding or leadership positions at three additional private ventures:
- xAI, the artificial intelligence company he founded and leads as its top executive.
- Neuralink, the brain-computer interface company he co-founded and where he guides strategic direction.
- The Boring Company, the tunneling and infrastructure venture he founded and oversees.
The titles at these companies are conventional founder and CEO designations. Since all three are private, their governance structures stay largely out of public view.
DOGE: Senior Adviser to the President
In early 2025, Musk took on a federal role connected to the Department of Government Efficiency initiative under the Trump administration. His official title was Senior Adviser to the President. A White House declaration stated that the role carried no actual or formal authority to make government decisions, and Musk served as a “special government employee,” a classification that limits both the length and the scope of federal service.
He left after roughly 130 days, describing his exit as the completion of his scheduled commitment. A senior adviser without formal decision-making authority sits in a very different legal position from a CEO with fiduciary duties, even when public perception blurs the two.
What the Titles Actually Mean Under the Law
Delaware corporate law, which governs Tesla and many of the other companies Musk leads, gives boards wide latitude to invent titles. The statute allows a corporation to have “such officers with such titles and duties as shall be stated in the bylaws or in a resolution of the board of directors.”4Delaware Code Online. Delaware Code Title 8 – Corporations So Technoking is a valid title in the same way Chief Executive Officer is.
Federal securities law, though, looks past the label. The SEC defines an “executive officer” to include the president, any vice president running a principal business unit, and any other person who performs a policymaking function.5eCFR. 17 CFR 240.3b-7 – Definition of Executive Officer6U.S. Securities and Exchange Commission. SEC Form 8-K7eCFR. 17 CFR 229.401 – Directors, Executive Officers, Promoters and Control Persons
The tax code takes the same functional approach. Under Section 162(m) of the Internal Revenue Code, a publicly traded corporation cannot deduct more than $1 million per year in compensation paid to a “covered employee,” a category that includes the principal executive officer, the principal financial officer, and the next three highest-paid officers. Once someone falls into that category, they stay in it permanently under the “once covered, always covered” rule. The cap covers salary, bonuses, stock awards, and deferred compensation, with no carve-out for performance-based pay. Renaming the CEO does not move that person out of the covered category.
Holding officer or director seats at multiple companies at once raises a separate issue. Section 8 of the Clayton Act prohibits a person from serving as an officer or director of two competing corporations when both exceed the statutory size thresholds, which are adjusted annually.8Federal Register. Revised Jurisdictional Thresholds for Section 8 of the Clayton Act It is a bright-line rule; regulators do not have to prove actual competitive harm. As Musk’s companies push into overlapping sectors, such as Tesla’s AI and robotics work sitting alongside xAI’s mission, the question of which of his ventures compete with each other becomes a live one.
The 2018 SEC action shows the practical stakes. A title can be handed out by a board and later stripped away by a regulator. The consequences flowed from Musk’s conduct as an officer, not from the particular name attached to him at the time.3U.S. Securities and Exchange Commission. Elon Musk Settles SEC Fraud Charges