There is a lot of info out there about who presumably financed Hitler.

Here's one version:

"In the early 1930s financial assistance to Hitler began to flow more readily. There took place in Germany a series of meetings, irrefutably documented in several sources, between German industrialists, Hitler himself, and more often Hitler's representatives Hjalmar Sehaeht and Rudolf Hess. The critical point is that the German industrialists financing Hitler were predominantly directors of cartels with American associations, ownership, participation, or some form of subsidiary connection. The Hitler backers were not, by and large, firms of purely German origin, or representative of German family business. Except for Thyssen and Kirdoff, in most cases they were the German multi-national firms — i.e., I.G. Farben, A.E.G., DAPAG, etc. These multi-nationals had been built up by American loans in the 1920s, and in the early 1930s had American directors and heavy American financial participation.

One flow of foreign political funds not considered here is that reported from the European-based Royal Dutch Shell, Standard Oil's great competitor in the 20s and 30s, and the giant brainchild of Anglo-Dutch businessman Sir Henri Deterding. It has been widely asserted that Henri Deterding personally financed Hitler. This argument is made, for instance, by biographer Glyn Roberts in The Most Powerful Man in the World. Roberts notes that Deterding was impressed with Hitler as early as 1921:

...and the Dutch press reported that, through the agent Georg Bell, he [Deterding] had placed at Hitler's disposal, while the party was "still in long clothes," no less than four million guilders.7

It was reported (by Roberts) that in 1931 Georg Bell, Deterding's agent, attended meetings of Ukrainian Patriot in Paris "as joint delegate of Hitler and Deterding."8 Roberts also reports:

Deterding was accused, as Edgar Ansell Mowrer testifies in his Germany Puts the Clock Back, of putting up a large sum of money for the Nazis on the understanding that success would give him a more favored position in the German oil market. On other occasions, figures as high as £55,000,000 were mentioned.9"