Prospective Anthropic investors better buckle up, because the AI company's seven co-founders are firmly in the driver's seat.

The Amodei siblings — Anthropic CEO Dario Amodei and President Daniela Amodei — and five others will be the "sole members" of "Founder LLC," a new entity that will hold 50.1% of the voting power of the company's outstanding shares. The structure gives them "the ability to determine the outcome of all matters submitted to a vote of our stockholders generally for the foreseeable future," Anthropic said in its IPO prospectus on Monday.

The arrangement will also limit the power and influence of institutional and retail investors, who will have to put their trust in a small band of artificial intelligence engineers and researchers as the company marches toward a trillion-dollar-plus market cap.…