The company seeks a valuation of as much as $6.5 billion after being valued at $10 billion last year. : Reddit Inc. and its investors are seeking to raise as much as $748 million in what would be one of the biggest initial public offerings so far this year, according to people familiar with the matter. The social media platform and some of its current shareholders plan a sale of 22 million shares for $31 to $34 each, said the people, who asked not to be identified because the information wasn’t public yet.