X0306 4 2019-06-27 0 0001743881 BridgeBio Pharma, Inc. BBIO 0001103804 VIKING GLOBAL INVESTORS LP 55 RAILROAD AVENUE GREENWICH CT 06830 0 0 1 0 0001629482 Viking Global Opportunities Illiquid Investments Sub-Master LP 55 RAILROAD AVENUE GREENWICH CT 06830 0 0 1 0 0001629472 Viking Global Opportunities Portfolio GP LLC 55 RAILROAD AVENUE GREENWICH CT 06830 0 0 1 0 0001629476 Viking Global Opportunities GP LLC 55 RAILROAD AVENUE GREENWICH CT 06830 0 0 1 0 0001133006 HALVORSEN OLE ANDREAS 55 RAILROAD AVENUE GREENWICH CT 06830 0 0 1 0 0001621842 Ott David C. 55 RAILROAD AVENUE GREENWICH CT 06830 0 0 1 0 0001711393 Shabet Rose Sharon 55 RAILROAD AVENUE GREENWICH CT 06830 0 0 1 0 Common Stock 2019-06-27 4 C 0 11736137 A 11736137 I See Explanation of Responses Common Stock 2019-06-27 4 C 0 10178954 A 21915091 I See Explanation of Responses Common Stock 2019-06-27 4 P 0 4705900 17.00 A 26620991 I See Explanation of Responses Series C Preferred Units 2019-06-27 4 C 0 51781276 D Common Stock 11736137 0 I See Explanation of Responses Series D Preferred Units 2019-06-27 4 C 0 50446451 D Common Stock 10178954 0 I See Explanation of Responses Immediately prior to the closing of the Issuer's initial public offering ("IPO"), the Series C Preferred Units and Series D Preferred Units in BridgeBio Pharma LLC held by the Reporting Persons (defined below) were exchanged for shares of common stock, par value $0.001 per share (the "Common Stock"), of the Issuer in an exempt transaction pursuant to Rules 16b-6 and 16b-7. O. Andreas Halvorsen, David C. Ott and Rose S. Shabet are Executive Committee members of certain management entities, including Viking Global Partners LLC, the general partner of Viking Global Investors LP ("VGI"), Viking Global Performance LLC ("VGP"), Viking Long Fund GP LLC ("VLFGP") and Viking Global Opportunities GP LLC ("Opportunities GP"), the sole owner of Viking Global Opportunities Portfolio GP LLC ("Opportunities Portfolio GP"). VGI provides managerial services to various investment funds, including Viking Global Equities Master Ltd. ("VGEM"), Viking Long Fund Master Ltd. ("VLFM") and Viking Global Opportunities Illiquid Investments Sub-Master LP ("Opportunities Fund," and together with VLFM and VGEM, the "Viking Funds"). VGP serves as the investment manager of VGEM. Opportunities Portfolio GP is the general partner of Opportunities Fund. VLFGP serves as the investment manager of VLFM. Each of the Viking Funds, VGI, VGP, VLFGP, Opportunities Portfolio GP, Mr. Halvorsen, Mr. Ott and Ms. Shabet (collectively, the "Reporting Persons") may be deemed to beneficially own the shares reported on this form. VGEM directly holds 631,167 shares of Common Stock; VLFM directly holds 251,204 shares of Common Stock; and Opportunities Fund directly holds 25,738,620 shares of Common Stock. VGI provides managerial services to the Viking Funds. Because of the relationship between VGI and the Viking Funds, VGI may be deemed to beneficially own the shares directly held by the Viking Funds. VGP is the investment manager of VGEM. Because of the relationships between VGP and VGEM, VGP may be deemed to beneficially own the shares directly held by VGEM. VLFGP serves as the investment manager of VLFM. Because of the relationship between VLFGP and VLFM, VLFGP may be deemed to beneficially own the shares directly held by VLFM. Opportunities Portfolio GP is the general partner of Opportunities Fund. Because of the relationship between Opportunities Portfolio GP and Opportunities Fund, Opportunities Portfolio GP may be deemed to beneficially own the shares of Common Stock held directly by Opportunities Fund. Opportunities GP is the sole owner of Opportunities Portfolio GP. Because of the relationship between Opportunities GP and Opportunities Portfolio GP, Opportunities GP may be deemed to beneficially own the shares of Opportunities Fund. The Reporting Persons disclaim beneficial ownership of these securities except to the extent of their pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purpose. On June 27, 2019, the Viking Funds acquired an aggregate of 4,705,900 shares of Common Stock at a price of $17.00 per share in connection with the IPO. VGEM acquired 631,167 shares in the IPO, VLFM acquired 251,204 shares in the IPO and Opportunities Fund acquired 3,823,529 shares in the IPO. (9) The Reporting Persons are jointly filing this Form 4 pursuant to Rule 16a-3(j) under the Exchange Act. (10) Each of O. Andreas Halvorsen, David C. Ott and Rose S. Shabet is signing individually and as an Executive Committee Member of VIKING GLOBAL PARTNERS LLC, on behalf of VIKING GLOBAL INVESTORS LP, and as an Executive Committee Member of VIKING GLOBAL OPPORTUNITIES GP LLC, on behalf of itself and VIKING GLOBAL OPPORTUNITIES PORTFOLIO GP LLC and VIKING GLOBAL OPPORTUNITIES ILLIQUID INVESTMENTS SUB-MASTER LP. (11) Because no more than 10 reporting persons can file any one Form 4 through the SEC's EDGAR system, VGP, VGEM, VLFGP and VLFM have jointly filed with the Reporting Persons on a separate Form 4 filing submitted on the same day hereof. /s/ O. Andreas Halvorsen (9)(10) 2019-06-28 /s/ David C. Ott (9)(10) 2019-06-28 /s/ Rose S. Shabet (9)(10) 2019-06-28