Report of Recepts and Disbursements. https://docquery.fec.gov/pdf/377/201610269034584377/201610269034584377.pdf#navpanes=0
Looks like he received a $1000 contribution back in 2016, but nothing in a recent cycle. Steve Scalise, though, has received large contributions from Black Rock on a continuous basis. Did you raise concerns over this with his candidacy? How about Donald Trump, who is also a recipient?
https://www.opensecrets.org/orgs/blackrock-inc/recipients?id=D000021872