NEW YORK, Sept 29 (Reuters) - Twitter Inc plans to make its IPO filing public this week, news website Quartz reported on Sunday, citing a person familiar with the social media network's plan.

Twitter, which is expected to be valued at up to $15 billion, filed with U.S. regulators on Sept. 12 to go public, but did so confidentially and without providing a timeline under a process available to emerging growth companies.

Quartz said that Twitter's IPO could still be delayed by a variety of factors, from changes to the prospectus to market conditions, to a potential shutdown of the U.S. government. Representatives for Twitter did not immediately respond to a request seeking comment on the Quartz report.

Twitter is leaning toward picking the New York Stock Exchange over Nasdaq for its highly anticipated initial public offering, a person familiar with the matter said last week.

Another person familiar with the matter said earlier this month that Twitter aimed for its shares to trade in the stock market before the U.S. holiday of Thanksgiving on Nov. 28, a timeline also reported by Quartz on Sunday.