We compute this metric for the following TICCS pillars: business model, industrial (super)class, region/country and corporate structure. For a given TICCS pillar, these numbers give an idea of the concentration of each category. This is a similar computation to Effective number of constituents except that the Herfindahl-Hirschman Index (HHI) is computed from the weights of each TICCS category as opposed to the weight of a constituent.

For a given TICCS pillar (e.g. business model) the weight of a TICCS category within it (e.g. contracted) is computed as:

\text{Weight of TICCS category} = \sum\limits_{i=1}^{n} (w_{i})

where:

 is the weight of asset i,

n is the number of constituents in that TICCS category