SEO registrations galvanize information gathering about issuing firms. Issuers also provide additional information in the registration period. We posit that market reaction to such new information influences issuers’ decision about their final offer size. The offer size relative to the amount filed initially further reveals the quality of the issuing firm and helps predict subsequent firm performance. Improved offerings, whose offer size exceeds the amount registered originally, record significantly positive price reaction on the offer date and do not underperform post- issuance. The converse is true for their complement: Regular offers experience significantly negative reaction on the offer date and underperform their benchmark following issuance.