The bulls marched on as Alder Biopharmaceuticals Inc. joined the growing queue of biotechs seeking to prevail on the public markets. The Bothell, Wash.-based company filed a registration statement with the SEC seeking to raise up to $115 million in its initial public offering (IPO) to fund its ongoing clinical program for lead compound ALD403, a monoclonal antibody targeting calcitonin gene-related peptide, or CGRP, to prevent migraine headache.