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EcoR1 Capital, LLC - Portfolio Stock Holdings

EcoR1 Capital, LLC disclosed 37 stock positions in a recent SEC 13F filing. $2,339,872,482 of stock holdings were filed, with the largest holdings including ZYME, ANAB, and JAZZ. This filing represented positions held on March 31, 2026, and was filed on May 15, 2026.

We estimate the fund has a total AUM of $3,424,668,843 and has 22 employees, per a recent ADV filing. Most of the fund’s AUM appears to come from pooled investment vehicles.

Report Period:

March 31, 2026

No. of Stocks:

37

Est. Stock Holding Value:

$2,339,872,482

Top Stock Holdings By Sector

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Portfolio Stock Holdings - EcoR1 Capital, LLC

Stock
Holdings (Shares)
Holdings (USD)
% of Portfolio
Change (Shares)
Change (USD)
% Change

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Portfolio Options Holdings - EcoR1 Capital, LLC

Stock
Type
Holdings (Contracts)
Holdings (USD)
Change (Contracts)
Change (Value)

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Note: Options holding values may be affected by fund filing errors.