When private companies buy other private companies it's often equity-only. Here it's trickier because Next Jump is older and also gearing up for an IPO. It could be cash, or it could be very attractive equity. It doesn't seem like it'd have been a fire sale.
At first I thought tomtc meant that ex-Tandem computers folks had been part of these startups, But he is talking about http://www.tandementrepreneurs.com/