Wells Fargo Securities, Deutsche Bank Securities and Jefferies are acting as joint book-running managers for the offering.
StealthGas said it intends to grant the underwriters a 30-day option to purchase up to 1.5m additional company shares.
Based on the current share price StealthGas could be in line to raise about $125m from the share issue before costs.
Proceeds from the offering will go towards vessel acquisitions, capital expenditures and other general corporate purposes.
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