Up to $75,000,000
of Common Stock

We have entered into a Sales Agreement, dated September 19, 2025, (the "Sales Agreement"), with A.G.P./Alliance Global Partners ("A.G.P." or the "Sales Agent") relating to the sale of shares of our Class A common stock, par value $0.00001 per share ("common stock" or "Common Stock"), offered by this prospectus supplement, having an aggregate offering price of up to $75,000,000 from time to time through or to the Sales Agent, acting as sales agent or principal.

Sales of shares of our common stock, if any, under this prospectus supplement will 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"). The Sales Agent is not required to sell any specific amount, but will act as sales agent on a commercially reasonable efforts basis consistent with its normal trading and sales practices, on mutually agreed terms between the Sales Agent and us. There is no arrangement for funds to be received in any escrow, trust or similar arrangement.

As sales agent, A.G.P. is entitled to compensation at a fixed commission rate equal to 3.0% of the gross proceeds of each sale of shares of our common stock. In connection with the sale of our shares of common stock on our behalf, the Sales Agent will be deemed to be an "underwriter" within the meaning of the Securities Act and the compensation of the Sales Agent will be deemed to be underwriting commissions or discounts. We have also agreed to provide indemnification and contribution to the Sales Agent with respect to certain liabilities, including liabilities under the Securities Act and the Securities Exchange Act of 1934, as amended (the "Exchange Act"). See the section titled "Plan of Distribution" beginning on page S-15 for additional information regarding the Sales Agent's compensation.

Our common stock is listed on The Nasdaq Stock Market LLC ("Nasdaq") under the symbol "MNTS." On June 17, 2026, the last reported sale price of our common stock on Nasdaq was $10.06 per share.