Well, almost certainly Eli Lilly & Co., although I'm not sure how precisely, directly, or clearly this was ever said or described.

Really nice primary document here "Synthesis and Chemistry of Lysergic Acid Derivatives. Part 1 - DTIC" from the Defense Technical Information Center. Declassfied and pretty, pretty great. References Eli Lilly synthesizing process in 1953 at latest.

Two more primary documents from the Frank Olsen family:

1951, setting up liaisons with Project Artichoke http://frankolsonproject.org/staging01/wp-content/uploads/2018/01/1951-nov-20-Project-Artichoke.jpg

1953, budgeting, costs, and descriptions for 'cut-outs', cover, and funding for [REDACTED]. MKULTRA Subproject 8 given by name Specifically. Signed by Dr. Sidney Gottlieb.

Eli Lilly patent Application for Preparation of lysergic acid amides, 1954 https://patents.google.com/patent/US2736728A/en

At the time, Sandoz Labs was giving LSD out to researchers for free, in the interest of finding some commercially viable use for a drug that was semi-accidentally synthesized and which the company otherwise had no pharmacological use for. It was sitting on a shelf not making any money for Sandoz at that point, so all the better if researchers could find a use for it.

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It's important to note that, concurrent with MK ULTRA, there was a lot of perfectly above-board and non-secret legitimate research into LSD's potential to treat psychiatric patients. There's no reason to think that the US military sponsored research would have had a different source from the publicly known research of the same time.

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Source: How To Change Your Mind, Michael Pollan. It's possible that Pollan even specifically says that Sandoz provided LSD to the MK ULTRA researchers.

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Acid Dreams: The Complete Social History of LSD is also a good resource on this era of psychedelic research which focuses much more on MK ULTRA than Pollan's book does. However, it's from the mid-90s and might not be as current as How To Change Your Mind, which came out earlier this year and is more about the legit psychiatric research.