Gossamer Bio Inc. said it could to raise up to $264.5 million in its initial public offering, according to a Securities and Exchange Commission filing late Wednesday. The San Diego-based biotech company said it planned to offer 14.4 million shares at $16 a share with an additional 2.2 million shares for underwriters to cover overallotments, which if used, would value the company at just over $1 billion. Given the partial government shutdown, which is in its 33rd day, the company said it was using "Section 8(a) of the Securities Act" for the registration to become effective automatically.