David Trone takes the self-funding crown for congressional candidates partly because he has given money to his own campaign as direct contributions — not loans to be paid back through subsequent fundraising. (Marlon Correa/El Tiempo Latino)

Maryland Democratic congressional candidate David Trone has put another $2.5 million of personal funds into his campaign for the 8th District Democratic nomination, according to new filings with the Federal Election Commission.

The latest contributions, combined with the $9.9 million reported on his first-quarter campaign finance disclosure last week, makes Trone the heaviest self-funding House candidate ever.

Trone spokesperson Mary Werden declined to comment on the donations and said the campaign does not publicly discuss strategy.

Notice of the two contributions, one for $977,000 and the other for $1,504,000, were filed with the FEC on Friday and Sunday respectively. Federal election law requires special notice for all contributions of $1,000 or more made less than 20 days but more than 48 hours in advance of an election. The primary is April 26.

Even without Trone’s money, the 8th District race has become the priciest House contest so far in the 2016 cycle at $4.3 million, according to data compiled by the non-partisan Center for Responsive Politics. Most of that sum ($3.3 million) has been spent by two candidates: former news anchor Kathleen Matthews and State Sen. Jamie Raskin. Matthews reported last week that she put $500,000 of her own money into her campaign.

The total collected by candidates other than Trone through traditional fundraising ($6 million), trails only the $9.2 million in Wisconsin’s 1st District House race, nearly all of it amassed by the incumbent, House Speaker Paul Ryan (R-WI).

Trone takes the self-funding crown in part because he said his money is in the form of direct contributions — not loans to be paid back through subsequent fundraising.

Democrat Phil Maloof loaned his campaign close to $10 million in two 1998 losses (one a June special election, the other the November general) for New Mexico’s 1st District House seat. Part of the loan was repaid, resulting in a net self-funding of a little over $6.3 million (about $9.2 million in current dollars), according to center data.

West Virginia Democrat James Humphreys loaned his campaign $7.8 million (about $10 million in current dollars) in 2002, when he lost to then-Rep. Shelley Moore Capito (R) in the state’s 2nd Congressional District.