Why would pilots "call the company" after an aborted takeoff? I was skimming through the RealATC videos on YouTube today and watched this one. In it there are two flights taking off from Chicago-Midway (KMDW); Delta flight DAL1328/DL1328 and SouthWest's SWA3828/WN3828. They are each taking off from crossing runways (4R and 31C). For some reason, even though SWA3828 is given clearance to take off, the Delta flight also starts its own rollout.

After the call to abort is given, both aircraft abort takeoff and are able to then safely leave their respective runways in order to taxi back to the proper starting point. One of the aircraft states it will need a few minutes to check for heated brakes. Then both aircraft state they will need to "call company" for some unspecified reason.

Why would both planes need to call company? My guess is to recalculate fuel used to determine if they will have enough fuel to continue the trip. Why else might they need to do so?
An RTO can happen for any reason, mechanical, FOD, ATC error, etc.

The boss (airline operations) will want to know what happened.

Safety

Is everyone safe?

Is anyone in immediate danger?

Prepare documents for the NTSB investigation.

Time

How much time will be lost (e.g. to cool the brakes); this can affect the schedule of this particular plane days ahead. Especially if maintenance is required.

Notify the destination airport of the delay, and also publish the delay for the next flight from said destination airport.

Maintenance

Make sure the airline's maintenance stationed at the airport can deal with the issue.

If not, get on the phone with airlines who can help.

Find a replacement plane and send it over there.

Get the all-clear from an airline engineer that the hot brakes won't affect another attempt. It depends on how hot they are.

If a delay is expected, start the clock, airlines can keep passengers on a stationary plane for so long, I guess it's two hours. Been there, it's awful.

If it will take more, find them a gate, if no gate is available, get the stairs and a bus.

Whose fault was it?

Get a grip on the PR before things get out of hand, i.e. tweet.

If anyone is suspected of not doing their job properly, start an investigation.

If the ATC is at fault, send them the bill.

If it is another airline's fault, call the insurance company.

Fuel

Not really an issue for an aborted take-off after few seconds of take-off thrust, but nonetheless run the numbers again. Both in the cockpit and in the ops center.