The Senate will question representatives of tech giants Twitter and Facebook on Wednesday. The chamber’s Intelligence Committee also invited Alphabet CEO Larry Page but rejected the company’s counteroffer to send Google’s chief legal officer.

Roll Call found 32 members of Congress have stock ownership in the three companies. These stocks are held in trust funds, IRAs and brokerage accounts for the members, their spouses or their dependent children. In total, members of Congress have invested more than $7,000,000 in the three tech companies subject to scrutiny in Wednesday’s hearings.

Of the three, Twitter finds itself especially in the committee’s crosshairs. The social media giant faces criticism for the way it allegedly filters political content on its platform. CEO Jack Dorsey is expected to face tough questions from panels in both the House and Senate for his company’s role in public space moving forward.

Rep. Michael McCaul has the biggest ownership in the tech companies, he listed more than $3.5 million Facebook and Google.

Only one of the members who will be questioning the tech leaders has any stock in the three companies. Maine Republican Susan Collins, who sits on the Senate Intelligence Committee, listed stock holdings in Google and Facebook, both worth more than $15,000. The Senate Intelligence panel will question Dorsey and Facebook COO Sheryl Sandberg in a hearing on foreign influence and the use of social media platforms.

When Facebook co-founder and CEO Mark Zuckerberg, came to Washington for his marathon hearing, he faced three members who owned Facebook stock.

Rep. Tom MacArthur holds the largest amount of Twitter stock with more than $100,000, but he will so far not question Dorsey at any scheduled hearings.

Here is the breakdown of members and their stock holdings as of their most recent financial disclosures.

Twitter

• John Garamendi – $1,001
• Katherine M. Clark – $15,001
• Tom MacArthur – $102,003

Facebook

• John Garamendi – $1,001
• James R. Comer – $1,001
• Carlos Curbelo – $1,00
• Tom Rooney – $50,001
• Susan Collins – $15,001
• Steve Chabot – $15,001
• Pat Roberts – $15,001
• Mike Kelly – $15,001
• Lamar Smith – $15,001
• Kurt Schrader – $15,001
• Joyce Beatty – $15,001
• Francis Rooney – $15,001
• Brenda Lawrence – $15,001
• Alan Lowenthal – $15,001
• Sheldon Whitehouse – $66,003
• Ro Khanna – $80,003
• Josh Gottheimer – $81,004
• John Hoeven – $100,001
• Joseph P. Kennedy III – $130,004
• James B. Renacci – $200,002
• Jim Langevin – $300,002
• Nancy Pelosi – $500,001
• Brad Schneider – $500,002
• Michael McCaul – $1,500,002

Google (Stocks marked as Google and Alphabet Inc)

• Carlos Curbelo – $1,001
• Bob Gibbs – $1,001
• Fred Upton – $3,003
• Susan Collins – $15,001
• Mike Kelly – $15,001
• David Joyce – $15,001
• Francis Rooney – $30,002
• Thomas R. Carper – $50,001
• Kurt Schrader – $80,003
• Diane Black – $100,001
• Heidi Heitkamp – $100,002
• Sheldon Whitehouse – $130,003
• Ro Khanna – $130,004
• John Hoeven – $150,002
• James B. Renacci – $250,003
• Joseph P. Kennedy III – $460,010
• Michael McCaul – $2,000,000