The investment sector and associated companies of team members under funds (VC, PE, Angels) are curated from the Companies database.
For example -
A is working for fund XYZ and is involved in its investment. XYZ invests in Company Hector, which is in the fintech sector. Hence, A is associated with Hector and the fintech sector.
If A is a board member of Hector, then also she will be associated with Hector and the fintech sector.
Note that Board membership information is curated for selected geographies only.