Stockholders of BridgeBio Pharma, Inc. and Eidos Therapeutics, Inc. Approve BridgeBio Pharma, Inc. Acquisition of Eidos Therapeutics, Inc. PALO ALTO, Calif. and

Stockholders of BridgeBio Pharma, Inc. and Eidos Therapeutics, Inc.

Approve BridgeBio Pharma, Inc. Acquisition of Eidos Therapeutics, Inc.

PALO ALTO, Calif. and SAN FRANCISCO, January 19, 2021 BridgeBio Pharma, Inc. ( BridgeBio ) (Nasdaq: BBIO) and Eidos Therapeutics,

Inc. ( Eidos ) (Nasdaq: EIDX) today announced that the stockholders of each of BridgeBio and Eidos voted to approve all proposals related to BridgeBio s acquisition of all of the outstanding shares of Eidos common stock that BridgeBio

does not already own. The merger is expected to close on or about January 26, 2021, subject to the satisfaction or waiver of other conditions to closing.

At a special meeting of Eidos stockholders held virtually today, Eidos stockholders approved the adoption of the previously disclosed merger agreement with

BridgeBio and each of the other proposals related to BridgeBio s proposed acquisition of Eidos.

At a special meeting of BridgeBio stockholders held

virtually today, BridgeBio stockholders approved the proposal to issue common stock to Eidos stockholders in connection with the proposed acquisition.

We are ready and eager to welcome Eidos back into BridgeBio s ecosystem of scientific innovation, said Neil Kumar, Ph.D., founder and CEO of

BridgeBio and CEO of Eidos. We believe this merger will allow us to fully unlock the potential of acoramidis, the investigational therapy Eidos is developing to target transthyretin (TTR) amyloidosis (ATTR), creating value for patients and

investors. I d like to thank BridgeBio and Eidos stockholders for their support and their overwhelming approval of this transaction.

of Eidos common stock may elect to receive, for each share of Eidos common stock issued and outstanding immediately prior to the effective time of the merger (the Effective Time ) that is not owned by BridgeBio or any of its subsidiaries

and that is not a restricted share award, either (1) 1.85 shares of common stock of BridgeBio (the Stock Consideration ) or (2) $73.26 in cash (the Cash Consideration and, together with the Stock Consideration, the

Merger Consideration ), subject to proration. The Cash Consideration will be prorated as necessary to ensure that the aggregate amount of cash consideration payable in the merger is no greater than $175 million. Any Eidos

stockholders who do not make a proper election by 5:00 p.m., New York City time, on January 21, 2021 will be deemed to have elected to receive the Stock Consideration for their shares of Eidos common stock.

hope through rigorous science a bridgebio company

About BridgeBio Pharma

BridgeBio Pharma is a team of experienced drug discoverers, developers and innovators working to create life-altering medicines that target well-characterized

genetic diseases at their source. BridgeBio was founded in 2015 to identify and advance transformative medicines to treat patients who suffer from Mendelian diseases, which are diseases that arise from defects in a single gene, and cancers with

clear genetic drivers. BridgeBio s pipeline of over 20 development programs includes product candidates ranging from early discovery to late-stage development. For more information visit www.bridgebio.com.

About Eidos Therapeutics

Eidos Therapeutics is a

clinical stage biopharmaceutical company focused on addressing the large and growing unmet need in diseases caused by transthyretin (TTR) amyloidosis (ATTR). Eidos is developing acoramidis, a potentially disease-modifying therapy for the treatment

of ATTR. For more information, visit www.eidostx.com.

Additional Information and Where to Find It

This press release is being made in respect of the proposed transaction involving BridgeBio and Eidos, which was submitted to BridgeBio s and Eidos

stockholders for their consideration. BridgeBio and Eidos have each filed relevant materials with the U.S. Securities and Exchange Commission (the SEC ), including a registration statement on Form

S-4 (Registration No. 333-249944) that includes a proxy statement of BridgeBio and Eidos, and that also constitutes a prospectus of BridgeBio (the Joint Proxy

Statement/Prospectus ), that was mailed or otherwise provided to BridgeBio and Eidos stockholders on or about December 15, 2020.

release does not constitute an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote or approval. This press release is not intended to be, and is not, a substitute for such filings or for any other

document that BridgeBio or Eidos may file with the SEC in connection with the proposed transaction. INVESTORS AND SECURITY HOLDERS ARE URGED TO CAREFULLY READ THE ENTIRE REGISTRATION STATEMENT, JOINT PROXY STATEMENT/PROSPECTUS, AND ANY OTHER

RELEVANT DOCUMENTS FILED WITH THE SEC, AS WELL AS ANY AMENDMENTS OR SUPPLEMENTS TO THESE DOCUMENTS, CAREFULLY AND IN THEIR ENTIRETY BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED TRANSACTION. The documents filed or furnished by

BridgeBio and Eidos with the SEC may be obtained free of charge at the SEC s website at www.sec.gov. In addition, the documents filed by BridgeBio may be obtained free of charge from BridgeBio at investor.bridgebio.com, under the tab

Financials & Filings, and the documents filed by Eidos may be obtained free of charge from Eidos at www.eidostx.com, under the tab Investors. Alternatively, these documents, when available, can be obtained free of

charge from BridgeBio upon written request to BridgeBio at 421 Kipling Street, Palo Alto, CA 94301, Attn: Investor Relations, or by calling 650-391-9740, or from Eidos

upon written request to Eidos at 101 Montgomery Street, Suite 2000, San Francisco, CA 94104, Attn: Investor Relations, or by calling 415-887-1471.

No Offer or Solicitation

This press release is not intended to and does not constitute an offer to sell or the solicitation of an offer to buy, sell or solicit any securities or any

proxy, vote or approval in any jurisdiction pursuant to or in connection with the proposed transaction or otherwise, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to

registration or qualification under the securities laws of any such jurisdiction. No offer of securities shall be deemed to be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended

(the Securities Act ).

Forward-Looking Statements

This press release contains forward-looking statements relating to the proposed transaction involving BridgeBio and Eidos, including financial estimates and

statements as to the expected timing, completion and effects of the proposed transaction. Statements in this press release that are not statements of historical fact are considered forward-looking statements within the meaning of Section 27A of

the Securities Act, and Section 21E of the Securities Exchange Act of 1934, as amended (the Exchange Act ), which are usually identified by the use of words such as anticipates, believes,

continues , could , estimates, expects, intends, may, plans, potential , predicts , projects, seeks, should,

will, and variations of such words or similar expressions. We intend these forward-looking statements to be covered by the safe harbor provisions for forward-looking statements contained in Section 27A of the Securities Act and

Section 21E of the Exchange Act and are making this statement for purposes of complying with those safe harbor provisions. These forward-looking statements are neither forecasts, promises nor guarantees, and are based on the current beliefs of

BridgeBio s management as well as assumptions made by and information currently available to BridgeBio. Such statements reflect the current views of BridgeBio with respect to future events and are subject to known and unknown risks, including

business, regulatory, economic and competitive risks, uncertainties, contingencies and assumptions about BridgeBio and Eidos, including, without limitation, (i) the occurrence of any event, change or other circumstances that could give rise to

the termination of the proposed transaction, (ii) inability to complete the proposed transaction because, among other reasons, conditions to the closing of the proposed transaction may not be satisfied or waived, (iii) uncertainty as to

the timing of completion of the proposed transaction, (iv) potential adverse effects or changes to relationships with customers, employees, suppliers or other parties resulting from the announcement or completion of the proposed transaction,

(v) potential litigation relating to the proposed transaction that could be instituted against BridgeBio, Eidos or their respective directors and officers, including the effects of any outcomes related thereto, (vi) possible disruptions

from the proposed transaction that could harm BridgeBio s or Eidos respective business, including current plans and operations, (vii) unexpected costs, charges or expenses resulting from the proposed transaction,

(viii) uncertainty of the expected financial performance of each of BridgeBio and Eidos following completion of the proposed transaction, including the possibility that the expected synergies and value creation from the proposed transaction

will not be realized or will not be realized within the expected time period, (ix) the ability of BridgeBio and/or Eidos to implement their respective business strategies, (x) the ability of each of BridgeBio or Eidos to continue its

planned preclinical and clinical development of its respective development programs, and the timing and success of any such continued preclinical and clinical development and planned regulatory submissions, (xi) the potential therapeutic and

clinical benefits of acoramidis, (xii)

inability to retain and hire key personnel, (xiii) the amount of proposed stock consideration in the transaction and (xiv) the unknown future impact of the COVID-19 pandemic delay on certain clinical trial milestones and/or BridgeBio s or Eidos operations or operating expenses. Although BridgeBio believes that BridgeBio s and Eidos plans,

intentions, expectations, strategies and prospects as reflected in or suggested by these forward-looking statements are reasonable, BridgeBio cannot give any assurance that the plans, intentions, expectations or strategies will be attained or

achieved. Furthermore, actual results may differ materially from those described in the forward-looking statements and will be affected by a number of risks, uncertainties and assumptions, including, without limitation, those risks and uncertainties

described under the heading Risk Factors in BridgeBio s most recent Quarterly Report on Form 10-Q and Annual Report on Form 10-K filed with the SEC and

in subsequent filings made by BridgeBio with the SEC, which are available on the SEC s website at www.sec.gov. Moreover, BridgeBio operates in a very competitive and rapidly changing environment in which new risks emerge from time to time.

These forward-looking statements are based upon the current expectations and beliefs of BridgeBio s management as of the date of this press release and are subject to certain risks and uncertainties that could cause actual results to differ

materially from those described in the forward-looking statements. We anticipate that subsequent events and developments will cause our views to change. Except as required by law, BridgeBio disclaims any intention or responsibility for updating or

revising any forward-looking statements contained in this press release in the event of new information, future developments or otherwise. You should, therefore, not rely on these forward-looking statements as representing our views as of any date

subsequent to the date of this press release.

BridgeBio Pharma, Inc.