Total domestic hospital profits (including more than just public companies) is about $74 billion per year: https://www.modernhealthcare.com/article/20180104/NEWS/18010.... Insurance companies are $25 billion annualized: https://www.cnbc.com/2017/08/05/top-health-insurers-profit-s... ($7 billion per quarter for health insurers). The link above shows $100 billion in drug company profits worldwide; about half of revenues are in the US, so let’s say $100 billion in profits domestically. That’s $200 billion for the US healthcare industry, including non-public companies in addition to publicly traded companies.
Total US healthcare spending is $3.5 trillion. Profits account for just 6% of that spending.
To reduce healthcare spending to the same levels as the rich European countries like Germany or France we’d have to cut spending about $1.25 trillion. Cutting healthcare industry profits to zero (and note that there are for-profit hospitals and drug companies in the EU and they don’t make zero profit!) would reduce healthcare expenditures by just 1/6 of the amount required.