The Claws Foundation is the primary philanthropic vehicle of Arthur Dantchik and Jeffrey Yass, two of the managing directors of Susquehanna International Group, an options-trading company headquartered in Bala Cynwyd, Pennsylvania. The foundation primarily supports Jewish charities and libertarian causes, most notably the Institute for Justice, a public-interest law firm focused on property rights.
Arthur Dantchik and Jeffrey Yass
Susquehanna International Group
Arthur Dantchik and Jeffrey Yass met at as students at the State University of New York (Binghamton) in the late 1970s, where they bonded over a love of poker. Along with four other poker-playing colleagues, they founded Susquehanna International Group, the first company to use mathematical formulas to repeatedly and rapidly trade stocks. They first gained national attention in 1987, when “sources close to the firm” told the Philadelphia Inquirer that the company made $10 million by successfully predicting the “Black Friday” stock market crash. 
In 2010, Dantchik and Yass supported the Democratic gubernatorial primary campaign of Anthony H. Williams, a state senator representing south Philadelphia and nearby Delaware County. They said they backed Williams for his efforts to implement a statewide program of school vouchers in Pennsylvania. Dantchik donated $1.5 million to Williams’s campaign, Yass donated $1.9 million, and their Susquehanna International partner Joel Greenberg donated $2.1 million. Williams finished third in the Democratic primary, losing to Allegheny County executive Dan Onorato (D), who later lost the general election to then-Attorney General Tom Corbett (R).  Joe Watkins, who worked with Greenberg, Dantchik, and Yass on education reform, said school choice was “the civil-rights issue they talk about. This is all they talk about.” 
Greenberg, Dantchik, and Yass then contributed $6.6 million to a super PAC independently supporting Sen. Williams’s 2015 campaign for mayor of Philadelphia. Williams finished second in the Democratic primary with 26 percent of the vote. 
In 2016, Yass donated $2.2 million to three political action committees supporting the presidential campaign of Sen. Rand Paul (R-KY). After Sen. Paul withdrew from the race, Yass told Politico he could not support another Republican candidate, because “all hawks left now, except [U.S. Sen.] Bernie [Sanders (I-VT)].” Yass added that Democratic presidential candidate Bernie Sanders “is our best hope to stay out of war. On the other hand, he would shut my business down.”  Yass subsequently gave $1 million to political action committees supporting Libertarian presidential candidate Gary Johnson, telling Reason that even though Johnson lost, “no matter how small the chance (to) live in a libertarian world…The payoff is so high it’s worth it” to support the Libertarian Party. 
Personal Donations by Yass
In 2019 Yass, along with the Foundation for Individual Liberty, the Baron Capital Foundation, and the Washington Examiner, supported the production of “In Money We Trust?,” a Maryland Public Television documentary adapting a book by Steve Forbes and Elizabeth Ames. 
In April 2020 Jeffrey Yass and his wife, Janine Yass, donated $2.8 million to the Jump-Start Philly Schools Fund, which was organized to donate Chromebooks to charter and parochial students in Philadelphia forced to take classes at home because of the COVID-19 pandemic. Other donors to this fund included the Lenfest and McCausland Foundations. 
Claws Foundation grants in 2018 included $350,000 for the Cato Institute, a libertarian think tank, and $1 million for the Institute for Justice public-interest law firm. Jeffrey Yass is a member of the Cato Institute board and Arthur Dantchik is a member of the Institute for Justice board. 
The largest Claws Foundation grant in 2018 was $8.25 million to the Fidelity Charitable Gift Fund, a provider of donor-advised funds. The foundation made one other seven-figure gift in 2018, donating $1 million to Jerusalem Online University.