Over the years, Airbnb, a short-term lodging rental company founded in 2008, has raised more than $3 billion,<br />and secured a $1 billion line of credit, according to the research firm CB Insights.<br />The company, which disclosed the funding in a securities filing on Thursday, raised the money in a financing round<br />that began last summer and that valued the business at $30 billion.<br />The completion of the funding round follows the initial public offering this month of Snap, the maker of the ephemeral<br />messaging application Snapchat, which was also one of the most highly valued private companies before its debut.<br />Still, Brian Chesky, the chief executive of Airbnb, said in an interview in November that, although<br />he was not opposed to a public offering, the company had no immediate plans for one.<br />2 most valuable private company in the United States behind Uber, the ride-hailing business, according to CB Insights.