"Billionaire Hedge Fund Kingpin Clashes with Wall Street Sheriff over Bond Market Rule"

Billionaire hedge fund manager Ken Griffin, founder of Citadel Securities and Citadel hedge fund, is clashing with Securities and Exchange Commission (SEC) Chairman Gary Gensler over proposed rule changes for the multitrillion-dollar Treasury market. Griffin argues that the SEC's new rules could cost taxpayers billions of dollars and raise borrowing costs for businesses. The main point of contention is the Treasury basis trade, a tactic used by hedge funds to profit from the spread between shorting Treasury futures and buying corresponding Treasury bonds. Gensler is concerned about the size and leverage of the basis trade, while Griffin believes it helps keep spreads low and benefits taxpayers. Other major players in the market include Millennium Management, ExodusPoint Capital Management, Capula Investment Management, and Rokos Capital Management. The SEC has been working with other agencies to enhance the resilience of the Treasury market, implementing rule changes that include increased transparency and regulatory oversight for hedge funds.