Brilliant Earth shareholder proposes $1.38K sale

Accepted by SEC EDGAR 08/10/2026 - 08:31 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Brilliant Earth Group, Inc. shareholder Mainsail Co-Investors III, L.P. reported a proposed sale of 1,079 Class A shares, with an aggregate market value of $1,381.12 and an approximate sale date of August 10, 2026. Merrill Lynch is named as the broker. Mainsail acquired the shares on September 23, 2021, through reorganization transactions connected with the issuer’s IPO. Gavin Turner signed the notice.

Key Figures

Class A shares proposed for sale: 1,079 shares Aggregate market value: $1,381.12 Shares outstanding: 16,907,896 shares

3 metrics

Class A shares proposed for sale 1,079 shares Mainsail Co-Investors III, L.P.

Aggregate market value $1,381.12 Proposed sale

Shares outstanding 16,907,896 shares Brilliant Earth Group, Inc.

Key Terms

Pre-IPO Reorganization, Aggregate Market Value, Shares Outstanding

3 terms

Pre-IPO Reorganization technical

"Nature of Acquisition Transaction: Pre-IPO Reorganization"

Aggregate Market Value financial

"Aggregate Market Value | 1381.12"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

Shares Outstanding financial

"Number of Shares or Other Units Outstanding"

Shares outstanding are the total number of a company’s stock units held by all shareholders, including institutional investors and company insiders — think of them as the total number of slices of the company’s ownership pie. Investors use this number to calculate how much of the company each share represents, and it directly affects per-share measures like earnings per share, ownership percentage and valuation; when the slice count changes, an investor’s claim and the company’s per-share metrics change too.

FAQ

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

How many BRLT shares does Mainsail Co-Investors III, L.P. plan to sell?

Mainsail Co-Investors III, L.P., a shareholder, reported a proposed sale of 1,079 Class A shares with an aggregate market value of $1,381.12 and an approximate sale date of August 10, 2026. Merrill Lynch is named as the broker.

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	0001570211
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	Brilliant Earth Group, Inc.
SEC File Number	001-40836
Address of Issuer	300 Grant Avenue, Third Floor San Francisco CALIFORNIA 94108
Phone	8006910952
Name of Person for Whose Account the Securities are To Be Sold	Mainsail Co-Investors III, L.P.
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	Shareholder

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
Class A	Merrill Lynch 555 California Street 18th Floor San Francisco CA 94104	1079	1381.12	16907896	08/10/2026	Nasdaq

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 *
Class A	09/23/2021	Pre-IPO Reorganization	Issuer			1079	09/23/2021	Securities of the issuer were received in a series of reorganization transactions in connection with the issuer's IPO on 9/23/2021.

* 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	08/10/2026
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	Gavin Turner
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)