Company: BSM
Filing Date: 2025-04-30
Form Type: DEF 14A
Source: 0001193125-25-107202
Chunk: 4

Company: Black Stone Minerals, L.P.
Filing Date: 2025-04-30
Form: DEF 14A
Chunk 4
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,711,219 common units on an as-convertedbasis). In the aggregate, as of the Record Date, there were outstanding and entitled to vote 266,347,642 units. A list of holders of record as of the Record Date will be available for inspection during ordinary business hours at our offices located at 1001 Fannin Street, Suite 2020, Houston, Texas, 77002 from April 30, 2025 to the date of our virtual Annual Meeting. A copy of this list will be provided to you at no charge upon written request to Investor Relations at Black Stone Minerals, L. P. at the above listed address. The list will also be available for inspection by any unitholder in attendance at the Annual Meeting. 2

Units held in a nominee or street name account will be voted by the broker or other nominee in accordance with the instruction of the beneficial owner unless the arrangement between the beneficial owner and his nominee provides otherwise. Voting Procedures Registered Holders If, on the Record Date, you hold units that are registered directly in your name with our transfer agent, Equiniti Trust Company, LLC (“Equiniti”), you are considered a registered holder with respect to those units and entitled to notice of and to vote at the Annual Meeting. On or about April 30, 2025, we began mailing a Notice of Internet Availability of Proxy Materials to our registered holders of record detailing how to access the proxy materials electronically and how to submit a proxy by telephone, Internet, or mail or vote during the Annual Meeting. As a registered holder of record, you may vote your units by one of the following methods:

| • |     | By Internet. You may submit a proxy electronically via the Internet by following the on-screen instructions at www.voteproxy.com. Please have your Notice of Internet Availability of Proxy Materials, which includes your personal control number, in hand when you log onto the website. Internet voting facilities will close and no longer be available on the date and time specified on the Notice of Internet Availability of Proxy Materials. |

| • |     | By Telephone. You may view the proxy materials and obtain the toll-free number to call at www.voteproxy.com. Telephone voting facilities will close and no longer be available on the date and time specified on the Notice of Internet Availability of Proxy Materials. |

| • |     | By Mail. If you request paper copies of the proxy materials, you may submit a proxy by signing, dating, and returning the proxy card