AUSTIN — The Empower Texans political action committee has pumped another round of six-figure donations into the coffers of state Sens. Dan Patrick and Ken Paxton — cash injections funded almost entirely by Midland oilman Tim Dunn.

A new campaign finance report from the Empower Texans PAC details a $100,000 contribution to Patrick on March 28 and a donation in the same sum to Paxton on April 15 to help fuel their respective runoff campaigns.

The political arm of Michael Quinn Sullivan’s Empower Texans also gave $50,000 to Konni Burton, who is facing Mark Shelton in the Republican runoff for Wendy Davis’ Senate seat, and $10,000 for Rep. Steve Toth, who is running to replace former state Sen. Tommy Williams in Saturday’s special election.

The filing, which became publicly available Monday, covers the reporting period from February 28 to May 2, and is the first spending report the Empower Texans PAC has filed since about a week before the March 4 primary.

Patrick, R-Houston, is the favorite heading into the May 27 runoff against Lt. Gov. David Dewhurst, and has already received substantial support from the Empower Texans PAC. Records show the Empower Texans PAC has given Patrick a total of $375,000 since June, along with a $25,000 in-kind contribution for a February teleforum.

Paxton, R-McKinney, beat state Rep. Dan Branch handily in the primary to replace Greg Abbott as attorney general, but has been dogged recently by ethics concerns, including a recent fine leveled by state regulators for flouting securities laws. The Empower Texans PAC has also given Paxton a total of $375,000 since June.

The filing also shows the Empower Texans PAC remains almost completely dependent on one source of funding: Dunn’s checkbook (The Dallas Morning News’ Bob Garrett noted back in January that Dunn’s cash made up the bulk of PAC’s contributions).

According to the filing, Dunn provided a little more than 98 percent of the PAC’s funding during the most recent period, contributing $600,000 of the total $610,000 raised. Since the beginning of 2014, Dunn has accounted for right around the same percentage of the PAC’s total contributions, giving a total of $1,161,000 out of $1,179,945 raised.