Company limit of less than 300kts below FL100 and less than 250 below 5000ft/FL50 (applicable to all fleets, be it boeing or airbus). Those are hard limits and may not be busted in any case, be it departure or arrival. Within those limits we may help ATC with higher than 250kts, however if given "maintain highspeed" or "free speed" we have to reduce to 250, only when a specific speed is requested by ATC we may fly that if higher than 5000ft.
I'm quite happy with that, but it means i have to be a tad more conservative in my descent planning to cater for route shortening below FL100 which i cannot work around with a higher speed anymore. German airspace C has no speedlimit below FL100 which usually enabled us to fly faster than 250kts, until the company changed their inhouse limits that is.