Pfizer has a 501c3 nonprofit foundation. "The Pfizer Foundation, Inc."
The foundation has a net asset/fund balance of $285,759,065 as of the end of FY2019.
Of that, $68,078,108 is in Blackrock stock.
And $205,129,954 is in Blackrock corporate bonds.
The more you know!
Source: https://apps.irs.gov/pub/epostcard/cor/136083839_2019606(1)pdf
That might be the steepest rise in net worth of any elected official ever! They all increase their wealth tremendously once in office, but considering she had almost nothing at the start, it's almost like a neon sign saying "I got rich by being sent to Congress!"