Big Pharma and mainstream media are largely owned by two asset management firms: BlackRock and Vanguard. Drug companies are driving COVID-19 responses — all of which, so far, have endangered rather than optimized public health — and mainstream media have been willing accomplices in spreading their propaganda, a false official narrative that leads the public astray and fosters fear based on lies. Vanguard and BlackRock are the top two owners of Time Warner, Comcast, Disney and News Corp, four of the six media companies that control more than 90% of the U.S. media landscape. BlackRock and Vanguard form a secret monopoly that own just about everything else you can think of too. In all, they have ownership in 1,600 American firms, which in 2015 had combined revenues of $9.1 trillion. When you add in the third-largest global owner, State Street, their combined ownership encompasses nearly 90% of all S&P 500 firms. Vanguard is the largest shareholder of BlackRock. Vanguard itself, on the other hand, has a unique structure that makes its ownership more difficult to discern, but many of the oldest, richest families in the world can be linked to Vanguard funds.
https://childrenshealthdefense.org/defender/blackrock-vanguard-own-big-pharma-media/
Vanguard is owned by the people who invest in its funds.
https://www.investopedia.com/articles/investing/110515/who-are-owners-vanguard-group.asp
However, because there are lots and lots of people who own these funds, it's not feasible for Vanguard to ask each investor for their votes when it comes time to vote on the companies that the fund themselves invest in. So Vanguard votes on companies using its own sets of rules. This does give Vanguard some power over the companies. It's kind of like a representative democracy. Instead of every investor directly voting on the companies, the investors delegate their power to Vanguard and Vanguard votes on their behalf. If you don't like how they vote, you can take your money out of Vanguard.
Vanguard publishes how they've been voting here: https://corporate.vanguard.com/content/dam/corp/advocate/investment-stewardship/pdf/policies-and-reports/2021_investment_stewardship_annual_report.pdf