I'm not surprised why big companies no matter what morals they claim(ed) to follow still do business like nothing happened. As long as they can strive for profits and shareholder value they will. Big business is the last place one should look for any sort of backbone.
I'm also surprised why there hasn't been more of an impact on the stock market. I wouldn't have expected an immediate drop of 50% or some catastrophic decrease like that. That's because a lot of the incredibly smart economic policies from stable genius will take time to cut into bottom lines. First prices continue to go up for US consumers, spending will go down, unemployment numbers will go up, and then possibly a recession. Which he will blame on Greenland, I suppose.
Stock markets are legal gambling. As long as the gamblers still have hope they will play. Most will play without hope as well. And Trump 45 was good for them so hope is still very much alive.
At the same time, chainsaw wielding deregulation will help businesses in the US. It may not be great for consumers or the environment but tax breaks are great if you can get them. Melon Usk is not bulldozing any sort of oversight for his business interests or the IRS for no reason.
As for uprooting security alliances I think we will see a move away from US manufactured defense goods pretty soon, maybe starting next year. Europe will concentrate on its own industry more than ever. Even if they don't find a common position to take in regards to Russia's invasion of Ukraine, they will all look to increase spending locally rather than transatlantically, having hopefully learned that reliance on Washington is futile.
Defense contacts are harder to get rid of than a Tesla though, these things take even longer to show up on Wall Street. I mention Tesla though because numbers came out recently in France and Germany that showed a dramatic drop in new car registrations. I think this development on the micro level will eventually reach macro proportions as well. I am personally waiting for pitchforks being sharpened in Usk's boardrooms because his doge antics and political statements cut into their bonuses.