0001193125-26-283076 Sample Contracts

FORM OF CUSTODY AGREEMENT
Custody Agreement • June 25th, 2026 • William Blair ETF Trust • Massachusetts
FORM OF ADMINISTRATION AGREEMENT
Administration Agreement • June 25th, 2026 • William Blair ETF Trust • Massachusetts

This Administration Agreement (“Agreement”) dated and effective as of [ ], 2026, is by and between State Street Bank and Trust Company, a Massachusetts trust company (the “Administrator”), and William Blair ETF Trust, a [ trust] (the “Trust”).

FEE WAIVER AGREEMENT
Fee Waiver Agreement • June 25th, 2026 • William Blair ETF Trust

FEE WAIVER AGREEMENT (the “Agreement”), effective as of [ ], 2026 by and between William Blair Investment Management, LLC, a Delaware limited liability company (the “Adviser”) and William Blair ETF Trust, a Delaware statutory trust (the “Trust”), on behalf of each series of the Trust reflected in Schedule A hereto, as may be amended from time to time (each a “Fund” and collectively, the “Funds”).

FORM OF MANAGEMENT AGREEMENT
Management Agreement • June 25th, 2026 • William Blair ETF Trust • Illinois

AGREEMENT made as of this [ ] day of [ ], 2026, by and between WILLIAM BLAIR ETF Trust, a Delaware statutory trust (the “Trust”), on behalf of each series of the Trust named on Schedule A hereto, as such Schedule may be revised from time to time (each, a “Portfolio” and, collectively, the “Portfolios”) and William Blair Investment Management, LLC, a Delaware limited liability company (the “Manager”).

FORM OF AUTHORIZED PARTICIPANT AGREEMENT WILLIAM BLAIR ETF TRUST
Authorized Participant Agreement • June 25th, 2026 • William Blair ETF Trust • New York

This Authorized Participant Agreement (the “Agreement”) is entered into by and between William Blair & Company, L.L.C. (the “Distributor”) and __________ (the “Participant”) and is subject to acceptance by State Street Bank and Trust Company, as transfer agent for the William Blair ETF Trust (the “Trust”) (the “Transfer Agent”), and is further subject to acknowledgement and agreement by the Trust), a series trust offering a number of portfolios of securities (each a “Fund” and collectively the “Funds”). Capitalized terms used but not defined herein are defined in the current prospectus for each Fund as it may be supplemented or amended from time to time and included in the Trust’s Registration Statement on Form N-1A, as it may be amended from time to time, or otherwise filed with the U.S. Securities and Exchange Commission (“SEC”) (together with such Fund’s Statement of Additional Information incorporated therein, the “Prospectus”).

FORM OF TRANSFER AGENCY AND SERVICE AGREEMENT
Transfer Agency and Service Agreement • June 25th, 2026 • William Blair ETF Trust

THIS AGREEMENT is made as of the ____ day of ___________, 2026, by and between STATE STREET BANK AND TRUST COMPANY, Massachusetts trust company having its principal office and place of business at One Congress Street, Suite 1, Boston, Massachusetts 02114 (“State Street” or the “Transfer Agent”), and WILLIAM BLAIR ETF TRUST, a __________ business trust having its principal office and place of business at _________________________ (the “Trust”).

FORM OF UNDERWRITING AGREEMENT
Underwriting Agreement • June 25th, 2026 • William Blair ETF Trust

AGREEMENT made as of this __ day of ________, 2026, between WILLIAM BLAIR ETF TRUST, a Delaware statutory trust (hereinafter called the “Trust”), and WILLIAM BLAIR & COMPANY, L.L.C., a Delaware limited liability company (hereinafter called the “Underwriter”), with respect to the Creation Units (as defined below) of shares of beneficial interest (the “Shares”) of all series of the Trust now in existence hereto or subsequently created (each, a “Fund” and collectively, the “Funds”);

FORM OF SUBSCRIPTION AGREEMENT
Subscription Agreement • June 25th, 2026 • William Blair ETF Trust