en.wikipedia.org/wiki/The_Marvels

The $374 million figure came from an earlier set of accounts for Disney's U.K. production company Warbird Productions II UK covering the year ended September 30, 2023. But a later set of full accounts, filed with Companies House on June 30, 2025 for the year ended September 30, 2024, superseded that figure.

Forbes' review of those later filings reports that Warbird Productions II UK "spent $13.3 million during that period bringing the total cost to $387.3 million (£317.8 million)". That means the article's gross budget figure of $374 million is no longer the latest documented total.

So the claim is incorrect because it presents an earlier interim cost figure as if it were the final/current gross production budget.

The $307.3 million net figure was based on an earlier snapshot of the production company's finances. Later filings for Warbird Productions II UK showed additional spending after that point.

Forbes' review of the later Companies House accounts says the company's total cost rose to $387.3 million and that it had "banked a total reimbursement of $68.4 million", which "brings Disney's net spending on The Marvels down to $318.9 million."

Because a later filed set of accounts superseded the earlier one, $307.3 million (net) is not the latest supported figure.

This sentence repeats an earlier gross budget figure that was later superseded.

According to Forbes' review of the later Companies House accounts for Disney's U.K. production company Warbird Productions II UK, the company spent an additional $13.3 million after the earlier filing, bringing the movie's total cost to $387.3 million (£317.8 million) by September 30, 2024.

Companies House' filing history confirms that a newer set of full accounts for the year ended September 30, 2024 was filed on June 30, 2025, after the earlier 2023 accounts. That makes $374 million an outdated interim figure rather than the latest documented gross production budget.