Segantii Allegations Roil a Go-To Block Trader for Banks (1)

To the outside world, Simon Sadler was the “block-trade king” in Asia, running a hedge fund that produced stellar returns for many years. Inside his firm’s Hong Kong headquarters, it was a pressure cooker for investment staff.

Sadler’s Segantii Capital Management Ltd. has long played a vital role helping Wall Street banks unload chunks of stock, dominating one of the market’s last old-school businesses by what colleagues described as Sadler’s sheer force of will.

Simon Sadler

Photographer: Catherine Ivill/Getty Images

Interviews with more than a dozen people with ties to Segantii paint a picture of a hard-charging work culture that didn’t brook anything ...