BSM Form 144: 11,128 Shares Reported

BSM Form 144 notice reports proposed sale related to 11,128 shares of Common Stock tied to restricted stock vesting under a registered plan with a transaction date of 01/13/2026.

Rhea-AI Filing Summary

BSM Form 144 notice reports proposed sale related to 11,128 shares of Common Stock tied to restricted stock vesting under a registered plan with a transaction date of 01/13/2026. The filing lists an amount of $149,697.19 and identifies NYSE as the market.

Insights

Securities Compliance Analyst

Routine Section 144 notice for vested restricted shares.

The filing lists 11,128 shares associated with restricted stock vesting under a registered plan and a transaction date of 01/13/2026. The amount shown is $149,697.19; the exchange is listed as NYSE.

This appears administrative: the filing notifies the market of a proposed sale under Section 144. Cash‑flow treatment and final sale timing are not disclosed in the excerpt; subsequent filings would show actual dispositions if executed.

Key Figures

Shares reported: 11,128 shares Dollar amount listed: $149,697.19 Transaction date: 01/13/2026 +2 more

5 metrics

Shares reported 11,128 shares Securities To Be Sold; <date>01/13/2026</date>

Dollar amount listed $149,697.19 Securities Information field in the excerpt

Transaction date 01/13/2026 Restricted stock vesting under a registered plan

Exchange NYSE Listed under Securities Information

Identifier listed 212499331 Securities Information line (possible internal/CUSIP reference)

Key Terms

Form 144, restricted stock vesting, registered plan

3 terms

Form 144 regulatory

"144: Securities To Be Sold"

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.

restricted stock vesting financial

"Restricted stock vesting under a registered plan"

Restricted stock vesting is the timetable and conditions under which shares granted to employees or insiders become fully owned and can be sold, typically requiring continued work or meeting performance goals. It matters to investors because large blocks of shares can become tradable at once, which can change share supply and price, and because vesting aligns insiders’ incentives with the company’s long‑term performance—think of it like a timed unlock that both rewards and locks in key people.

registered plan regulatory

"Restricted stock vesting under a registered plan"

A registered plan is a savings or investment account that a government recognizes for special tax treatment and rules, such as limits on how much you can put in and conditions for withdrawals. For investors it matters because those rules change how much of your gains are taxed, how quickly your money can be accessed and what strategies make sense — like a labeled jar that gives tax breaks but comes with rules about when and how you can take the money out.

FAQ

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

What does the BSM Form 144 report?

The Form 144 reports a proposed sale of 11,128 shares of common stock tied to restricted stock vesting on 01/13/2026. It lists $149,697.19 and indicates the NYSE as the trading market.

Does the filing confirm shares were sold for BSM?

No. The Form 144 indicates a proposed sale related to vested restricted stock on 01/13/2026. It notifies intent under Section 144; actual sale execution and proceeds are not confirmed in the provided excerpt.

How many shares and what dollar amount are listed in the BSM excerpt?

The excerpt lists 11,128 shares and an amount of $149,697.19. These figures are presented in the filing’s securities information and relate to the restricted stock vesting disclosed for 01/13/2026

Why is a Form 144 filed for vested restricted stock?

Form 144 is used to notify the market when certain insiders or affiliates intend to sell restricted or control securities. The excerpt shows the sale is tied to restricted stock vesting under a registered plan and names the NYSE as the market.

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

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Accepted by SEC EDGAR 05/12/2026 - 04:10 PM Learn about SEC filing dates

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	0002017596
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 Street, Suite 2020 Houston TEXAS 77002
Phone	(713) 445-3200
Name of Person for Whose Account the Securities are To Be Sold	ASHLEY J LONGMAID
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	Director

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	11128	149697.19	212499331	05/12/2026	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	01/13/2026	Restricted stock vesting under a registered plan	Issuer			11128	01/13/2026	Services Rendered

* 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

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	05/12/2026
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/ Ashley Longmaid
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)