Brilliant Earth Group, Inc.

BRLT· Nasdaq

Since Oct 4, 2025

Transactions: 13
Purchases: 5
Sales: 8
Purchase value: $38.83K
Sale value: $174.42K

Values are shares multiplied by reported price when both were supplied, each trade counted once however many filers reported it.

Gerstein Beth TamaraDirector · Chief Executive Officer · 10% owner

Filed Aug 19, 2026Period of report Aug 18, 20260001628280-26-058095

Transaction	Security	Shares	Price	ValueValue (shares × price)	Held after	Ownership
PurchaseAug 19, 2026	Class A Common Stock^F2^F3	3,203	$1.26	$4.04K	10,000	Direct
PurchaseAug 18, 2026	Class A Common Stock^F1	6,797	$1.25	$8.50K	6,797	Direct

Filing footnotes · 3

F1This transaction was executed in multiple trades ranging from $1.16 to $1.29. The price reported above reflects the weighted average purchase price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares and prices at which the transaction was effected.
F2This transaction was executed in multiple trades ranging from $1.25 to $1.26. The price reported above reflects the weighted average purchase price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares and prices at which the transaction was effected.
F3The shares purchased in the transactions reported herein are in addition to the LLC Interests (and associated shares of Class C common stock that are convertible into shares of Class A common stock) held by Just Rocks, Inc. Just Rocks, Inc. is jointly owned and controlled by the reporting person and Eric Scott Grossberg.

Open on SEC EDGAR

Grossberg Eric ScottDirector · Executive Chairman · 10% owner

Filed Aug 19, 2026Period of report Aug 18, 20260001628280-26-058094

Transaction	Security	Shares	Price	ValueValue (shares × price)	Held after	Ownership
PurchaseAug 19, 2026	Class A Common Stock^F3^F2	381	$1.26	$480.06

Dziesietnik SharonChief Operations Officer

4Rule 10b5-1 plan disclosed

Filed Aug 19, 2026Period of report Aug 17, 20260001628280-26-057934

Transaction	Security	Shares	Price	ValueValue (shares × price)	Held after	Ownership
Sale

Kuo Jeffrey ChuenhongChief Financial Officer

Filed Aug 17, 2026Period of report Aug 13, 20260001628280-26-057223

Transaction	Security	Shares	Price	ValueValue (shares × price)	Held after	Ownership
PurchaseAug 13, 2026	Class A Common Stock^F1	10,000	$1.36	$13.60K	693,130	Direct

Mainsail Co-Investors III, L.P.10% owner

Mainsail GP III, LLC10% owner

Mainsail Incentive Program, LLC10% owner

Mainsail Management Company, LLC10% owner

Mainsail Partners III, L.P.10% owner

Filed Aug 12, 2026Period of report Aug 10, 20260001193125-26-347377

Transaction	Security	Shares	Price	ValueValue (shares × price)	Held after	Ownership
Sale

Turner GavinDirector · 10% owner

Filed Aug 12, 2026Period of report Aug 10, 20260001193125-26-347375

Transaction	Security	Shares	Price	ValueValue (shares × price)	Held after	Ownership
SaleAug 10, 2026	Class A Common Stock^F4^F1^F5	50,000	$1.287	$64.35K

Harris Jennifer NoelDirector

4Rule 10b5-1 plan disclosed

Filed Jun 23, 2026Period of report Jun 18, 20260001628280-26-044956

Transaction	Security	Shares	Price	ValueValue (shares × price)	Held after	Ownership
Sale

Dziesietnik SharonChief Operations Officer

4Rule 10b5-1 plan disclosed

Filed May 20, 2026Period of report May 18, 20260001628280-26-036888

Transaction	Security	Shares	Price	ValueValue (shares × price)	Held after	Ownership
Sale

Dziesietnik SharonChief Operations Officer

4Rule 10b5-1 plan disclosed

Filed Feb 20, 2026Period of report Feb 18, 20260001628280-26-010301

Transaction	Security	Shares	Price	ValueValue (shares × price)	Held after	Ownership
Sale

Dziesietnik SharonChief Operations Officer

4Rule 10b5-1 plan disclosed

Filed Nov 19, 2025Period of report Nov 17, 20250001628280-25-053167

Transaction	Security	Shares	Price	ValueValue (shares × price)	Held after	Ownership
Sale

P and S transaction codes only. Grants, gifts, option exercises, tax withholding, and Form 144 notices are not counted as purchases or sales. A row whose filed price fails a plausibility check, or that is not common stock, is listed but left out of the values; a trade reported by several filers is counted once.

Filing footnotes · 5

F1Represents 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").
F2LLC 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.
F3Consists 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.
F4Mainsail 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.
F5This 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.

Filing footnotes · 5

F1Represents 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").
F2LLC 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 person prior to the Issuer's initial public offering, do not expire.
F3Consists 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.
F4Mainsail 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 the reporting person 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 the reporting person is the sole Manager of MMC. The reporting person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interests therein.
F5This 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 person hereby undertakes 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.