No one “rules the world” but as you very well know shareholders do weld considerable power. They can boot CEOs and other execs unfriendly to their causes to the curb. They have direct access to powerful politicians and fund their campaigns. They can hire teams of lawyers to sue opponents or hire private investigators to look for dirt. Plant or massage stories in mainstream press or edit film scripts to suit their interests or worldview. . And of course their economic power far exceeds their personal net worth as they usually manage assets much greater in value.
The vast vast majority of Jews are middle class but when we are talking about billionaire class Jews, Jews are probably the most powerful block among shareholders. According to Forbes 400, usually between 30-35 percent of the wealthiest Americans are Jews in any given year. That leaves 70 percent distributed between all other factions. The US is the most powerful nation in the world so that projects out globally too. And of course there are many other Jewish billionaires based out of other states too.
In other words, when enough Jewish billionaires work as a team on some issue, they can have wildly disproportionate influence in world affairs. That’s where the trope of Jews ruling the world comes from. Jews as a whole don’t “rule the world” but around 0.0001ish percent of Jews, the super-elite class, do weld enormous power.