Common Stock, par value $0.001

Allakos Inc.

149 Commonwealth Drive, Menlo Park, CA, 94025

New Enterprise Associates 16, L.P. ("NEA 16") and NEA 18 Venture Growth Equity, L.P. ("NEA 18 VGE" and together with NEA 16, the "Funds"); NEA Partners 16, L.P. ("NEA Partners 16"), which is the sole general partner of NEA 16; NEA Partners 18 VGE, L.P. ("NEA Partners 18 VGE" and together with NEA Partners 16, the "GPLPs"), which is the sole general partner of NEA 18 VGE; NEA 16 GP, LLC ("NEA 16 LLC"), which is the sole general partner of NEA Partners 16; and NEA 18 VGE GP, LLC, which is the sole general partner of NEA Partners 18 VGE ("NEA 18 VGE LLC" and, together with NEA 16 LLC, the "GP LLCs"); and Ali Behbahani ("Behbahani"), Carmen Chang ("Chang"), Anthony A. Florence, Jr. ("Florence"), Mohamad H. Makhzoumi ("Makhzoumi"), Scott D. Sandell ("Sandell"), and Paul Walker ("Walker"), (together, the "Managers") and Peter W. Sonsini ("Sonsini"). Behbahani, Chang, Florence, Makhzoumi, Sandell and Walker are managers of the GP LLCs. The persons named in this Item 2 are referred to individually herein as a "Reporting Person" and collectively as the "Reporting Persons." The GPLPs and the GP LLCs are referred to herein as the "Control Entities."

The address of the principal business office of each Fund, each Control Entity and Sandell is New Enterprise Associates, 1954 Greenspring Drive, Suite 600, Timonium, MD 21093. The address of the principal business office of Behbahani, Chang, Makhzoumi and Walker is New Enterprise Associates, 2855 Sand Hill Road, Menlo Park, CA 94025. The address of the principal business office of Florence is New Enterprise Associates, 104 5th Avenue, 19th Floor, New York, NY 10011.

The principal business of each Fund is to invest in and assist growth-oriented businesses located principally in the United States. The principal business of NEA Partners 16 is to act as the sole general partner of NEA 16. The principal business of NEA Partners 18 VGE is to act as the sole general partner of NEA 18 VGE. The principal business of NEA 16 LLC is to act as the sole general partner of NEA Partners 16. The principal business of NEA 18 VGE LLC is to act as the sole general partner of NEA Partners 18 VGE. The principal business of each of the Managers is to manage the Control Entities, NEA 16, NEA 18 VGE and a number of affiliated partnerships with similar businesses.

During the five years prior to the date hereof, none of the Reporting Persons has been convicted in a criminal proceeding or has been a party to a civil proceeding ending in a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

The GP LLCs are each a limited liability company organized under the laws of the State of Delaware. The Funds and the GPLPs are each a limited partnership organized under the laws of the State of Delaware. Each of the Managers is a United States citizen.

The Reporting Persons do not beneficially own any shares of Common Stock.

Regarding the number of shares as to which such person has: (i) sole power to vote or to direct the vote: See line 7 of cover sheets (ii) shared power to vote or to direct the vote: See line 8 of cover sheets (iii) sole power to dispose or to direct the disposition: See line 9 of cover sheets (iv) shared power to dispose or to direct the disposition: See line 10 of cover sheets.

Except as set forth in Item 4 above, none of the Reporting Persons has effected any transactions in the Common Stock during the last 60 days.

No other person is known to have the right to receive or the power to direct the receipt of dividends from, or any proceeds from the sale of, Common Stock beneficially owned by any of the Reporting Persons.

Each of the Reporting Persons has ceased to own beneficially five percent (5%) or more of the Issuer's Common Stock as of May 15, 2025.