Only in the sense that larger companies can afford to fund their employees to work on IETF standards groups, and are thus more likely to end up contributing, editing and managing IETF groups.

The funding is not large, though: no dues, no grants, just the time that people spend and airfare/hotels up to three times a year -- usually two of those being inside the US. And it's possible to have quite a lot of impact simply by volunteering your time in a group in which you have some expertise.