STOCK TITAN

Brilliant Earth (BRLT) Mainsail holder converts units, sells 50K shares

(Neutral)
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Brilliant Earth Group, Inc. large shareholders affiliated with Mainsail reported exchanging 50,000 LLC Units and corresponding Class B common shares for 50,000 shares of Class A common stock, then selling 50,000 Class A shares at a weighted average price of $1.287 per share. After these conversions, Mainsail-affiliated entities indirectly hold 31,848,071 Class B shares and associated LLC Units, and they disclaim beneficial ownership beyond their respective pecuniary interests.

Positive

  • None.

Negative

  • None.
Insider MAINSAIL GP III, LLC, Mainsail Partners III, L.P., Mainsail Co-Investors III, L.P., MAINSAIL INCENTIVE PROGRAM, LLC, MAINSAIL MANAGEMENT COMPANY, LLC
Role 10% Owner | 10% Owner | 10% Owner | 10% Owner | 10% Owner
Sold 50,000 shs ($64K)
Approx. gross sale proceeds $64K
Type Security Shares Price Value
Conversion LLC Units F2, F1, F3, F4 50,000 -- --
Conversion Class B Common Stock F1, F2, F3, F4 50,000 -- --
Conversion Class A Common Stock F1, F4 50,000 -- --
Sale Class A Common Stock F4, F1, F5 50,000 $1.287 $64K
Holdings After Transaction: LLC Units — 31,848,071 shares (Indirect, See footnotes); Class B Common Stock — 31,848,071 shares (Indirect, See footnotes); Class A Common Stock — 0 shares (Indirect, See footnote)
Footnotes (5)
  1. F1. Represents common units of Brilliant Earth, LLC (the "LLC Units") and shares of Class B common stock exchanged for shares of Class A common stock including (i) 48,824 LLC Units and shares of Class B common stock exchanged by Mainsail Partners III, L.P. ("MP III"), (ii) 97 LLC Units and shares of Class B common stock exchanged by Mainsail Incentive Program, LLC ("MIP"), and (iii) 1,079 LLC Units and shares of Class B common stock exchanged by Mainsail Co-Investors III, L.P. ("MCOI").
  2. F2. LLC Units (together with one share of Class B common stock for every LLC Unit) are exchangeable for one share of the Issuer's Class A common stock. The reported LLC Units, which were acquired by the reporting persons prior to the Issuer's initial public offering, do not expire.
  3. F3. Consists of (i) 31,098,704 shares of Class B common stock (and associated LLC Units) held by MP III, (ii) 61,823 shares of Class B common stock (and associated LLC Units) held by MIP, and (iii) 687,544 shares of Class B common stock (and associated LLC Units) held by MCOI.
  4. F4. Mainsail GP III, LLC ("GP III") is the general partner of MP III. MCOI is a co-investment vehicle that invests alongside MP III. GP III is the general partner of MCOI. A three member investment committee of GP III acts by a majority vote, with Gavin Turner possessing a veto right, with respect to the voting and dispositive power of the securities held by MP III and MCOI. Mainsail Management Company, LLC ("MMC") is the managing member of MIP, and Gavin Turner is the sole Manager of MMC. Mr. Turner has separately reported the transactions and reported securities reflected in this statement. The reporting persons disclaim beneficial ownership of the reported securities except to the extent of their respective pecuniary interests therein.
  5. F5. This transaction was executed in multiple trades at prices ranging from $1.25 to $1.40, inclusive. The reported price reflects the weighted average sale price. The reporting persons hereby undertake to provide upon request to the United States Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transaction was affected.
Class A shares sold 50,000 shares Class A common stock sold by Mainsail-affiliated holders on 2026-08-10
Weighted average sale price $1.287 per share Sale of 50,000 Class A shares, trades between $1.25 and $1.40
Class B and LLC Units held 31,848,071 shares/units Indirectly held Class B common stock and associated LLC Units after conversion
LLC Units exchanged 50,000 units LLC Units (with matching Class B shares) exchanged 1-for-1 into Class A shares
LLC Units financial
"Represents common units of Brilliant Earth, LLC (the "LLC Units") and shares of Class B"
LLC units are ownership stakes in a limited liability company, similar to shares in a corporation; each unit represents a portion of the company’s profits, losses and often voting power. For investors, LLC units matter because they determine how much money and control someone gets, how easily an interest can be sold, and how income is taxed and reported — think of owning slices of a pie that also decide how the pie is cut and shared.
Class B common stock financial
"Consists of (i) 31,098,704 shares of Class B common stock (and associated LLC Units)"
A class B common stock is one of multiple types of a company’s ordinary shares that carries specific rights—often different voting power or dividend priority—compared with other classes. For investors it matters because those differences affect how much influence you have over company decisions, the income you might receive, and how freely the shares trade; think of it like owning a car with different keys: some keys let you start the engine and open the trunk, others only unlock the door.
weighted average sale price financial
"This transaction was executed in multiple trades at prices ranging from $1.25 to $1.40, inclusive. The reported price reflects the weighted average sale price."
beneficial ownership financial
"The reporting persons disclaim beneficial ownership of the reported securities except to the extent"
Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.
dispositive power financial
"a three member investment committee of GP III acts by a majority vote, with Gavin Turner possessing a veto right, with respect to the voting and dispositive power"
Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

FAQ

What insider activity did Brilliant Earth Group (BRLT) report in this Form 4?

Mainsail-affiliated holders exchanged 50,000 LLC Units and Class B shares for 50,000 Class A shares, then sold 50,000 Class A shares. These transactions reflect a derivative conversion followed by an open-market or private sale.

How many Brilliant Earth (BRLT) shares were sold and at what price?

Mainsail-affiliated entities sold 50,000 shares of Brilliant Earth Class A common stock at a weighted average price of $1.287 per share, with individual trade prices ranging from $1.25 to $1.40.

What conversion occurred between LLC Units and Brilliant Earth (BRLT) Class A stock?

Holders exchanged 50,000 LLC Units (each paired with one Class B share) for 50,000 Class A shares. Each LLC Unit plus one Class B share is exchangeable 1-for-1 into a single share of Class A common stock and does not expire.

How many Brilliant Earth (BRLT) LLC Units and Class B shares do the Mainsail entities hold after the transactions?

After the reported conversions, Mainsail-affiliated entities collectively hold 31,848,071 Class B shares and associated LLC Units, including positions in MP III, MIP, and MCOI, all reported as indirect ownership.

Who controls voting and dispositive power over the Brilliant Earth (BRLT) securities held by the Mainsail entities?

Voting and dispositive power for MP III and MCOI is exercised by a three-member investment committee of GP III, with Gavin Turner holding a veto right. MIP is managed by Mainsail Management Company, LLC.

Do the Mainsail reporting persons claim full beneficial ownership of their Brilliant Earth (BRLT) holdings?

No. The reporting persons disclaim beneficial ownership of the reported Brilliant Earth securities, except to the extent of their respective pecuniary interests in the entities that hold the shares and LLC Units.

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SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
MAINSAIL GP III, LLC

(Last)(First)(Middle)
C/O MAINSAIL MANAGEMENT COMPANY, LLC
500 WEST 5TH STREET, SUITE 1100

(Street)
AUSTIN TEXAS 78701

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
Brilliant Earth Group, Inc. [ BRLT ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
DirectorX10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/10/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
Form filed by One Reporting Person
XForm filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Class B Common Stock08/10/2026C(1)(2)50,000(1)D(1)31,848,071(3)ISee footnotes(3)(4)
Class A Common Stock08/10/2026C(1)50,000(1)A(1)50,000ISee footnote(4)
Class A Common Stock08/10/2026S(4)50,000(1)D$1.287(5)0ISee footnote(4)
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
LLC Units(2)08/10/2026C(1)(2)50,000(1) (2) (2)Class A Common Stock50,000(2)31,848,071(3)ISee footnotes(3)(4)
1. Name and Address of Reporting Person*
MAINSAIL GP III, LLC

(Last)(First)(Middle)
C/O MAINSAIL MANAGEMENT COMPANY, LLC
500 WEST 5TH STREET, SUITE 1100

(Street)
AUSTIN TEXAS 78701

(City)(State)(Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
1. Name and Address of Reporting Person*
Mainsail Partners III, L.P.

(Last)(First)(Middle)
C/O MAINSAIL MANAGEMENT COMPANY, LLC
500 WEST 5TH STREET, SUITE 1100

(Street)
AUSTIN TEXAS 78701

(City)(State)(Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
1. Name and Address of Reporting Person*
Mainsail Co-Investors III, L.P.

(Last)(First)(Middle)
C/O MAINSAIL MANAGEMENT COMPANY, LLC
500 WEST 5TH STREET, SUITE 1100

(Street)
AUSTIN TEXAS 78701

(City)(State)(Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
1. Name and Address of Reporting Person*
MAINSAIL INCENTIVE PROGRAM, LLC

(Last)(First)(Middle)
C/O MAINSAIL MANAGEMENT COMPANY, LLC
500 WEST 5TH STREET, SUITE 1100

(Street)
AUSTIN TEXAS 78701

(City)(State)(Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
1. Name and Address of Reporting Person*
MAINSAIL MANAGEMENT COMPANY, LLC

(Last)(First)(Middle)
C/O MAINSAIL MANAGEMENT COMPANY, LLC
500 WEST 5TH STREET, SUITE 1100

(Street)
AUSTIN TEXAS 78701

(City)(State)(Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
Explanation of Responses:
1. Represents common units of Brilliant Earth, LLC (the "LLC Units") and shares of Class B common stock exchanged for shares of Class A common stock including (i) 48,824 LLC Units and shares of Class B common stock exchanged by Mainsail Partners III, L.P. ("MP III"), (ii) 97 LLC Units and shares of Class B common stock exchanged by Mainsail Incentive Program, LLC ("MIP"), and (iii) 1,079 LLC Units and shares of Class B common stock exchanged by Mainsail Co-Investors III, L.P. ("MCOI").
2. LLC Units (together with one share of Class B common stock for every LLC Unit) are exchangeable for one share of the Issuer's Class A common stock. The reported LLC Units, which were acquired by the reporting persons prior to the Issuer's initial public offering, do not expire.
3. Consists of (i) 31,098,704 shares of Class B common stock (and associated LLC Units) held by MP III, (ii) 61,823 shares of Class B common stock (and associated LLC Units) held by MIP, and (iii) 687,544 shares of Class B common stock (and associated LLC Units) held by MCOI.
4. Mainsail GP III, LLC ("GP III") is the general partner of MP III. MCOI is a co-investment vehicle that invests alongside MP III. GP III is the general partner of MCOI. A three member investment committee of GP III acts by a majority vote, with Gavin Turner possessing a veto right, with respect to the voting and dispositive power of the securities held by MP III and MCOI. Mainsail Management Company, LLC ("MMC") is the managing member of MIP, and Gavin Turner is the sole Manager of MMC. Mr. Turner has separately reported the transactions and reported securities reflected in this statement. The reporting persons disclaim beneficial ownership of the reported securities except to the extent of their respective pecuniary interests therein.
5. This transaction was executed in multiple trades at prices ranging from $1.25 to $1.40, inclusive. The reported price reflects the weighted average sale price. The reporting persons hereby undertake to provide upon request to the United States Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transaction was affected.
/s/ Gavin Turner, Mainsail GP III, LLC08/12/2026
/s/ Gavin Turner, Mainsail Partners III, L.P.08/12/2026
/s/ Gavin Turner, Mainsail Co-Investors III, L.P.08/12/2026
/s/ Gavin Turner, Mainsail Incentive Program, LLC08/12/2026
/s/ Gavin Turner, Mainsail Management Company, LLC08/12/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)