yes, but unless you actually work at one of those firms it's difficult (if not impossible) to know what they really do. One of the things Timber Hill according to rumours was that Timber Hill priced volatility by sector. So if for example people were buying vol in Carrefour, vol in Delhaize and Ahold went up. Not certain this rumour is true however. I always admired Timber Hill but they most somehow lost their edge in the almost three decades they were trading with diminishing spreads.
