Parkland, Fla., shooting survivor David Hogg is calling for a boycott of two major investment management companies over their ties to gun manufacturers.

Hogg, who has become a prominent gun control activist after the shooting at Marjory Stoneman Douglas High School in February, urged his social media followers to make their feelings known to BlackRock and Vanguard.

Hogg was the focus of national media attention earlier this month after he sparked an advertiser boycott of Fox News host Laura Ingraham.

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Ingraham drew criticism after posting a tweet mocking Hogg for being rejected from four colleges. In response, Hogg tweeted out a list of companies who advertised on her show.

In the weeks following the spat, more than 20 companies pulled their advertisements from “The Ingraham Angle.” Ingraham apologized to Hogg, but he refused to accept, saying that she was only trying to save her advertisers.

BlackRock and Vanguard, along with several other companies, have faced scrutiny over their investments in gun manufacturers in the wake of the shooting. Sen. Elizabeth WarrenElizabeth Ann WarrenThe Hill's Morning Report — After contentious week, Trump heads for Japan On The Money: Senate passes disaster aid bill after deal with Trump | Trump to offer B aid package for farmers | House votes to boost retirement savings | Study says new tariffs to double costs for consumers Overnight Energy: Democrats ask if EPA chief misled on vehicle emissions | Dem senators want NBC debate focused on climate change | 2020 hopeful John Delaney unveils T climate plan MORE (D-Mass.) earlier this year named them in a letter calling for gun company shareholders to demand change in the arms industry after the shooting.