Susquehanna International Group

The firm’s website says that in the early 1980s a group of college friends traded independently on the floor of the Philadelphia Stock Exchange, using quantitative skills and poker experience, and joined together in 1987 to start what is now Susquehanna.⁠[1]

The firm began on the exchange’s options-trading floor and later moved to Bala Cynwyd in Montgomery County.⁠[2]

SIG was founded shortly before the Black Monday crash of October 1987, and trading after the crash helped it take off. By October 1988 it had grown from six co-founders to about 100 people with $30 million in annual revenue.⁠[3]

In 2012 SIG became ByteDance’s earliest U.S. backer, putting $3 million into its initial $5 million round. As of 2023 it held about 15% of ByteDance, worth about $21 billion.⁠[2]

A December 2023 regulatory filing showed SIG holding about 2% of Digital World Acquisition Corp. (about 605,000 shares); the company later merged with Trump Media & Technology GroupTrump Media & Technology GroupTrump Media & Technology Group (TMTG) is a publicly traded company headquartered in Sarasota, Florida. It operates Truth Social, the Truth+ streaming service and the Truth.Fi financial technology brand. The private company was formed in 2021 and completed its merger with Digital World Acquisition Corp. (DWAC) in 2024. A separate proposed merger with fusion-energy company TAE Technologies remained subject to the filing and approval process in late September 2026.Open the full entry.⁠[4]

In a March 2024 statement SIG said it was a market maker with “zero economic interest in Trump Media,” its long position being offset by short positions of the same size.⁠[4]

In a 13F filing with the SEC, SIG disclosed about $1.3 billion in spot bitcoin ETF holdings, including about $1.1 billion in Grayscale’s GBTC, across nine of the ten spot bitcoin ETFs then trading. The positions were a small part of the $575.9 billion listed in the filing and reflected holdings only as of March 31.⁠[5]

TikTok USDS Joint Venture LLC was formed in January 2026, with OracleOracleOracle (Oracle Corporation) is a U.S. enterprise software and cloud computing company founded in 1977 by Larry Ellison, Bob Miner, and Ed Oates. Starting with relational databases, it expanded into enterprise applications, cloud infrastructure, hardware, and industry systems, and broadened its product range through acquisitions of companies such as Sun Microsystems, NetSuite, and Cerner.Open the full entry, Silver Lake and MGXMGXMGX is an Abu Dhabi artificial intelligence and advanced technology investment company, announced in March 2024 by Abu Dhabi’s Artificial Intelligence and Advanced Technology Council with Mubadala and G42 as foundational partners and chaired by Sheikh Tahnoon bin Zayed Al Nahyan. It has invested in companies including OpenAI, Anthropic, xAI, Databricks, and Binance, and co-founded the AI Infrastructure Partnership (AIP) with BlackRock, Microsoft, and others.Open the full entry as managing investors holding 15% each, ByteDance retaining 19.9% and the rest held by investors including Vastmere Strategic Investments LLC. SIG managing director Mark Dooley joined the joint venture’s board.⁠[6]

Vastmere Strategic Investments is an affiliate of SIG.⁠[3]

SIG describes trading as its core business and calls itself one of the leading global market makers and algorithmic trading companies. Its other businesses include institutional brokerage and sales, private-equity funds such as growth equity and Asia venture capital, and the insurance business River’s Edge.⁠[7]

Susquehanna Predictions, one of the firm’s newer units, trades and makes markets on regulated prediction venues. The firm says it was the first institutional market maker to set up a dedicated prediction-markets desk.⁠[8]

Besides Bala Cynwyd, Pennsylvania, SIG has offices in cities including New York, Chicago, San Francisco, Dublin, London, Sydney, Hong Kong, Shanghai, Singapore, Tokyo and Mumbai.⁠[9]