The announcement of a public offering of 4.5 million shares by Perella Weinberg Partners is significant for investors as it directly impacts the company's equity structure and potentially its stock price. The short-term impact on the stock price will depend on the market's perception of the offering's value and its execution success. While such offerings can dilute existing shares, they can also provide the company with necessary capital for growth, which might be viewed positively if investors believe in the company's long-term strategy.