Mainsail Partners III, L.P.'s Form 4 filing
Brilliant Earth Group, Inc. (BRLT) · filed Aug 12, 2026
- Accession no.
- 0001193125-26-347377
- Filed
- Aug 12, 2026, 7:18 PM ET
- Trade date
- Aug 10, 2026
- Filing delay
- 2 days
- Rule 10b5-1 plan
- Not checked
This filing lists 3 non-derivative transactions and 1 derivative transaction. Open-market sales total $64.3K. It was filed 2 days after the trade.
Reporting owners
A Form 4 can have several reporting owners, such as a person and a fund they control. Trade tables show the first one.
| Owner | Relationship to the company |
|---|---|
| Mainsail Partners III, L.P.CIK 0001543760 | 10% Owner |
| Mainsail Co-Investors III, L.P.CIK 0001570211 | 10% Owner |
| Mainsail Incentive Program, LLCCIK 0001883293 | 10% Owner |
| Mainsail GP III, LLCCIK 0001883360 | 10% Owner |
| Mainsail Management Company, LLCCIK 0001883367 | 10% Owner |
Non-derivative securities (Table I)
Acquisitions and disposals of common stock and similar shares, one row per line on the filing.
| Trade date | Security | Transaction | Shares | Price | Value | Shares after | Ownership | Flags |
|---|---|---|---|---|---|---|---|---|
| Aug 10, 2026 | Class B Common Stock | CConversionDisposed | −50,000 | –F1 | – | 31,848,071 | Indirect | Duplicate filing |
| Aug 10, 2026 | Class A Common Stock | CConversionAcquired | +50,000 | –F1 | – | 50,000 | Indirect | Duplicate filing |
| Aug 10, 2026 | Class A Common Stock | SSaleDisposed | −50,000 | $1.29F5 | −$64,350 | 0 | Indirect | Duplicate filing |
Derivative securities (Table II)
Options, warrants, restricted stock units and similar. Shares are the underlying shares; price and value are for the derivative itself, and the holding after is in derivative units.
| Trade date | Security | Transaction | Underlying shares | Unit price | Value | Held after | Ownership | Flags |
|---|---|---|---|---|---|---|---|---|
| Aug 10, 2026 | Class A Common Stock | CConversionDisposed | −50,000 | –F2 | – | 31,848,071 | Indirect | Duplicate filing |
Footnotes and remarks
Livermore keeps the footnotes that transaction prices refer to, all footnotes of amendments (Form 4/A) and the filing's remarks. Other footnotes, such as how indirect holdings are held or the details of a trading plan, are only in the original on SEC EDGAR.
- 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").
Referenced by the price of 2 transactions in Table I.
- 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.
Referenced by the price of 1 transaction in Table II.
- 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.
Referenced by the price of 1 transaction in Table I.