The previous owner was Toucan. Or at least the principal owner. And LP has a continuing interest in Toucan, as far as we know. But beyond that it's a bit muddy. Toucan runs various dated funds, and periodically pays out to its own investors, when a fund reaches maturity. I've no idea if (or by how much) LP would have personally benefited from the sale of Cognate to its own management.
Oh yes. Advent was spun out of Cognate, before the management buyout. So Advent is owned by Toucan, in which LP has an interest.