You can look at who owns what in their portfolios, none of this is especially private information. They publish it all online. I literally just googled "who owns the most commercial real estate" and "commercial real estate bond ownership amounts" and things like that. It's not subtle, companies tout their ownership percentages and REITs list their investors.
I meant evidence of them campaigning, or financing/instigating campaigns, against remote work, thereby influencing decisions of companies to implement "back to work" policies.
ETA: I agree that you did not say this was happening in your original comment, but it seems to me your comment implied that these companies were actually influencing major decisions (since that's the topic of the OP).
Blackrock is a major institutional investor in just about every company, so they have press and backchannel effects. I assume similar things happen with e.g. vanguard and big ibanks. I know Jamie Dimon has been railing about RTO for a while.
Thanks, though I'll note that that article is about Blackrock encouraging/forcing its own workers to do hybrid work, not arguing that other companies should do so.
It's more than that, if you read the part below the fold they talk about "if we get more people back into offices the Fed's job will be easier", which I assume goes to a more systemic argument anyway. Cheers!