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finra rule 5130

How an IPO Actually Works: S-1, Bookbuilding, Greenshoe

September 17, 2026June 25, 2026 by Bruno M.

How a company goes public, step by step: the S-1 filing, bookbuilding, share allocation under FINRA Rule 5130, and the greenshoe that stabilizes the first weeks of trading.

Categories Market Education Tags finra rule 5130, greenshoe option, how an ipo works, investing basics, ipo bookbuilding, s-1 filing

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