You are misremembering.
At a certain point, more billionaires had publicly endorsed Harris.
Even Forbes admitted it had no idea whether more supported her financially, since many kept silent.
Since then we have some reporting (obviously dark money makes it more complicated).
Slightly more people who gave over 100,000 gave to Democrats.
Just a small percentage of the United State population contribute more than two hundred dollars to federal candidates, PACs, parties and outside groups. These donors give a hefty percent of all contributions. See the details.
www.opensecrets.org
The actual money totals for the two sides comes out pretty even.
Note, btw, that this is to the parties across all the elections, not just for President.
If you just go to "people who gave the most money, who did they give it to", then it becomes pretty solidly Republicans who got the money from the whales.
Who are the biggest donors in the 2024 election cycle? See the details.
www.opensecrets.org
Again, that's by party, not just to Presidential campaign.
SuperPACs complicate the matter, because we don't get to know who contributes to them.