BSM affiliate files Form 144 to sell 29,386 shares

Morgan Stanley Smith Barney LLC Executive Financial Services filed a Form 144 notice regarding 29,386 shares of Common Stock with a date of 05/05/2026 on the NYSE.

Accepted by SEC EDGAR 05/05/2026 - 04:27 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Morgan Stanley Smith Barney LLC Executive Financial Services filed a Form 144 notice regarding 29,386 shares of Common Stock with a date of 05/05/2026 on the NYSE. The excerpt also lists prior 10b5-1 sales by Luke Stevens Putman on 04/06/2026 (29,386 shares, $424,677.66) and 03/05/2026 (30,276 shares, $461,584.87).

Key Figures

Shares listed in notice: 29,386 shares 10b5-1 sale on 04/06/2026: 29,386 shares 10b5-1 sale on 03/05/2026: 30,276 shares +2 more

5 metrics

Shares listed in notice 29,386 shares listed with date 05/05/2026

10b5-1 sale on 04/06/2026 29,386 shares proceeds reported as $424,677.66

10b5-1 sale on 03/05/2026 30,276 shares proceeds reported as $461,584.87

Amount field shown $418,456.64 appears in securities information row

Identifier number 212333793 appears in the securities information row

Key Terms

10b5-1, Restricted and Performance Stock Units, Form 144, NYSE

4 terms

10b5-1 regulatory

"10b5-1 Sales for LUKE STEVENS PUTMAN 1001 FANNIN"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

Restricted and Performance Stock Units financial

"Restricted and Performance Stock Units | Issuer"

Form 144 regulatory

"Filer Information | 144: Filer Information"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

NYSE market

"05/05/2026 | NYSE 144: Securities To Be Sold"

A large, regulated marketplace where stocks and other securities are listed and traded, acting like a global auction house that matches buyers and sellers and helps determine share prices. It matters to investors because listing and trading there provide liquidity, price discovery, and regulatory oversight—making it easier to buy or sell holdings and giving companies a visible platform that can affect credibility and access to capital.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Form 144 for BSM report?

The Form 144 reports a proposed sale of 29,386 shares of Common Stock with an associated date of 05/05/2026. The filing identifies the selling party as Morgan Stanley Smith Barney LLC Executive Financial Services and lists the exchange as NYSE.

Who executed prior 10b5-1 sales mentioned in the filing for BSM?

Luke Stevens Putman is named for two prior 10b5-1 sales: 04/06/2026 (29,386 shares, $424,677.66) and 03/05/2026 (30,276 shares, $461,584.87). These appear as executed transactions in the excerpt.

What securities type and restrictions are noted in the BSM excerpt?

The excerpt lists Common stock and references Restricted and Performance Stock Units with a grant date of 01/07/2026. The filing labels the instrument type as Issuer in the securities section.

Is the filing tied to an exchange and what date is shown?

Yes, the excerpt shows the NYSE as the exchange and includes the date 05/05/2026 alongside the listed 29,386 shares. The filing fragment pairs the share count and date in the securities information row.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001337171
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	BLACK STONE MINERALS,L.P.
SEC File Number	001-37362
Address of Issuer	1001 FANNIN, SUITE 2020 HOUSTON TEXAS 77002
Phone	713-445-3200
Name of Person for Whose Account the Securities are To Be Sold	LUKE STEVENS PUTMAN
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	29386	418456.64	212333793	05/05/2026	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	01/07/2026	Restricted and Performance Stock Units	Issuer			29386	01/07/2026	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for LUKE STEVENS PUTMAN 1001 FANNIN, SUITE 2020 HOUSTON TX 77002	Common	04/06/2026	29386	424677.66
10b5-1 Sales for LUKE STEVENS PUTMAN 1001 FANNIN, SUITE 2020 HOUSTON TX 77002	Common	03/05/2026	30276	461584.87

144: Remarks and Signature

Remarks	The securities to be sold were acquired upon the vesting of Restricted and Performance Stock Units on 01/07/2026 and 02/24/2026.
Date of Notice	05/05/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	12/04/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Luke Stevens Putman
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)