The filing isn't a definitive sign that Bloomberg will seek the Democratic presidential nomination next year and an aide to the former New York City mayor told The Hill that he has not yet made a final decision on whether to launch a campaign.
But, the aide added, filing a statement of candidacy with the FEC was "another step towards running."
The filing is likely to stir consternation in the Democratic primary field, which has seen its number of candidates increase in recent weeks. Former Massachusetts Gov. Deval Patrick announced last week that he would mount an eleventh-hour bid for the party's nomination, and Bloomberg has already taken steps to get on the ballot in a handful of states, including Alabama, Arkansas and Tennessee.
Both Bloomberg and Patrick ruled out presidential campaigns last winter with Patrick citing family as his reason for punting on a White House run and Bloomberg deciding against a campaign after coming to the conclusion that former Vice President Joe Biden would prove to be too formidable a primary opponent.
That calculus has changed in recent months, however, as Biden has seen his once-clear frontrunner status erode. Polls currently show a fluid race between the top four candidates: Biden, Sen. Bernie Sanders (I-Vt.), Sen. Elizabeth Warren (D-Mass.) and South Bend, Ind., Mayor Pete Buttigieg.
Some Democratic leaders and party elites have grown anxious in recent months about the field of candidates, worrying that no one in the current lineup will be able to defeat President Trump in 2020. Bloomberg's advisers have made the argument that there is still room in the primary contest for a moderate that they see as more electable than the current slate of candidates.
While he has yet to make a final decision on a presidential run, Bloomberg has already started spending money on 2020. He is launching a $100 million digital ad campaign attacking Trump in crucial battleground states and is expected to spend between $15 million and $20 million on voter registration efforts.
Comment: Fmr NYC mayor Bloomberg says he will sell his media company if he runs for president in 2020
If he ultimately decides to mount a bid for the White House, Bloomberg is expected to forego a campaign in the four early primary and caucus states that have historically defined presidential nominating contests and will instead double down on delegate-rich Super Tuesday states like California.
"If we run, we are confident we can win in states voting on Super Tuesday and beyond, where we will start on an even footing," Howard Wolfson, a longtime adviser to Bloomberg, said earlier this month.
My best guess is that some people have fame, power and control issues and are addicted to the legacy cf their own life story.
But Bloomberg does bring something additional to the table. As an employer he implemented a relatively flat rather than pyramidal system of management into his organisation and he invested heavily in the health of his staff.