SpaceX has secured $75 billion from financial firms in anticipation of its public market debut on Friday, a move poised to be the highest-value stock listing in history. The space exploration and artificial intelligence company announced in a filing with the U.S. Securities and Exchange Commission that it had sold shares at $135 apiece.

This share price aligns with SpaceX's previous estimates, projecting an initial market valuation of nearly $1.8 trillion. Such a valuation could propel Chief Executive Elon Musk, already the world's wealthiest individual, toward becoming the first trillionaire globally.

The company is initially offering only 5% of its total available shares. The ultimate trading value of these shares will depend on factors such as the number of shares made available in the Initial Public Offering (IPO) and the strength of investor demand.

If SpaceX shares trade at or above the $135 mark when trading commences on Friday, the company would immediately rank among the world's most valuable public entities. However, the market's assessment of the shares' worth will be determined by investors.

Interest in acquiring stakes in SpaceX from investment funds and individual retail investors is anticipated to be substantial. Some financial analysts have already set target prices exceeding SpaceX's $135 estimate. For instance, global brokerage Oppenheimer projected on Thursday that the company's shares could reach $190 each.

The final public price for SpaceX shares will be established through an auction process on the open stock market. This mechanism allows supply and demand dynamics to dictate the price, reflecting investor sentiment towards the company's future prospects.

Individuals like Peta Cooper, a 43-year-old copywriter from Cornwall, are planning to invest. Cooper, who owns shares in tech and crypto firms, intends to invest approximately £750 in SpaceX, citing her admiration for the space industry and the company's track record in launches and innovation.

While Cooper anticipates potential short-term price fluctuations, she plans to hold the stock for the long term, demonstrating a belief in SpaceX's sustained growth and its ambitious ventures in space exploration and technology.