BIS

Butts in Seats, i.e., employees sitting at the office. Used in a couple of different ways: a) to count the actual number of employees, excluding people on leave, trainees, open but unfilled requisitions, etc. b) to count the number of people physically present in the office as opposed to working from home.

I know your department has budget for 18 people, but you only have 10 BIS, plus 2 in the hiring pipeline, and 2 who'll be coming back from parental leave next month.

The corporate mandate is for everyone to come in at least three days a week, but I don't see that many BIS.

index on

To "index on" something is to emphasize it or weight it.
To "over-index on" something is to over-emphasize it.
To "be over-indexed" is to be over-represented.

"Moreover, African Americans, Asians and Hispanics were all over-indexed on PBS's online platforms" (2013)
"Pepsi's loyal consumers 'over-indexed' on the desire to make the most out of every moment" (2015)
"I am already over-indexed on risky investments" (2016)
"...the overwhelming majority of our public attention is showered on a minuscule minority of humans. We are exceedingly over-indexed on our stars." (2020)
"People often index on skill when they are looking to hire" (2019)