Mr. Antal Rohit Desai - 26 Sep 2023 Form 4 Insider Report for REATA PHARMACEUTICALS INC

Footnote F1

Mr. Desai and his spouse serve as co-trustees of The 2:22 DNA Trust.

Footnote F2

CPMG, Inc. is the investment manager of each of: Nighthawk Partners, LP; Barred Owl Partners, LP; Killdeer Fund, LP; Crested Crane, LP; Gallopavo, LP; Roadrunner Fund, LP; Sandpiper Fund, LP; Mallard Fund, LP; Yellow Warbler, LP; Kestrel Fund, LP; Willet Fund, LP; Elepaio Partners, LP; CD Fund, LP; Redbird Life Sciences Partners, LP.; a managed account for Trustees of the University of Pennsylvania (collectively, the "Funds"). In such capacity, CPMG, Inc. may be deemed to have voting and investment power over the securities held directly by each of the Funds. Kent McGaughy, Jr. and Antal Desai, each of whom is a shareholder and managing partner of CPMG, Inc., may be deemed to share voting and investment power with respect to the securities held directly by CPMG, Inc. and the Funds. Mr. McGaughy, Jr. reports his beneficial ownership of these securities on a separate Form 4.

Footnote F3

Each of CPMG, Inc. and Mr. Desai (collectively, the "Reporting Persons") disclaims beneficial ownership of the securities reported herein except to the extent of its and his pecuniary interest therein, if any, and this report shall not be deemed an admission that the Reporting Persons are the beneficial owners of such securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or for any other purpose.

Footnote F4

Pursuant to the Agreement and Plan of Merger, dated July 28, 2023, by and among the Issuer, Biogen Inc. ("Biogen") and River Acquisition, Inc., the Issuer became a wholly-owned subsidiary of Biogen upon consummation of the merger (the "Effective Time"). At the Effective Time, each of the Issuer's outstanding shares of Class A common stock and Class B common stock was canceled and extinguished and automatically converted into the right to receive $172.50 in cash, without interest, less any withholding taxes.

Footnote F5

The Class B common stock was convertible into Class A common stock on a one-for-one basis at the holder's election at any time. The conversion right of the Class B common stock had no expiration date.