Those gauging investor interest this week include Shanghai-listed chip designer OmniVision Integrated Circuits Group Inc., which may raise as much as $1 billion, and drug-discovery company Insilico Medicine Inc., whose IPO may fetch about $300 million, people familiar with the deals said, asking not to be identified because they weren’t authorized to speak publicly. Shanghai Forest Cabin Cosmetics Group Co. is also gauging interest, according to terms of the deal seen by Bloomberg News.