Company: ABTC
Filing Date: 2025-09-03
Form Type: 424B5
Source: 0001213900-25-083737
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Company: American Bitcoin Corp.
Filing Date: 2025-09-03
Form: 424B5
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Filed Pursuant to Rule 424(b)(5)

Registration No. 333-289278

PROSPECTUS SUPPLEMENT

(To Prospectus Dated September 3, 2025)

<div align='center'>$2,100,000,000

Class A Common Stock</div>

We have entered into a Controlled
Equity Offering Sales Agreement (the “sales agreement”) with Cantor Fitzgerald & Co., Mizuho Securities USA
LLC, The Benchmark Company, LLC, BTIG, LLC, Canaccord Genuity LLC, Clear Street LLC, Craig-Hallum Capital Group LLC, H.C. Wainwright &
Co., LLC, JonesTrading Institutional Services LLC, Keefe, Bruyette & Woods, Inc., Needham & Company, LLC, Northland Securities,
Inc., Piper Sandler & Co., Roth Capital Partners, LLC and Virtu Americas LLC (each, a “sales agent,” and collectively,
the “sales agents”), relating to shares of our Class A common stock, par value $0.0001 per share (our “Class A common
stock”), offered by this prospectus supplement and the accompanying prospectus. In accordance with the terms of the sales agreement,
under this prospectus supplement we may offer and sell shares of our Class A common stock having an aggregate offering price of up to
$2,100,000,000 from time to time through the sales agents, acting as our agents, or directly to the sales agents, acting as principals.

Our Class A common stock is
listed on the Nasdaq Capital Market (“Nasdaq”) under the symbol “ABTC.” On September 2, 2025, the closing price
of our Class A common stock on Nasdaq was $6.90 per share, giving effect to the Reverse Stock Split (as defined below).

Sales, if any, of Class A
common stock under the sales agreement may be made in sales deemed to be “at the market offerings” as defined in Rule 415(a)(4)
promulgated under the Securities Act of 1933, as amended (the “Securities Act”), by means of ordinary brokers’ transactions,
to or through a market maker, on or through Nasdaq or any other market venue where the securities may be traded, in the over-the-counter
market, in privately negotiated transactions (including block transactions), or through a combination of any such methods of sale. The
sales agents may also sell our Class A common stock by any other method permitted