Mainsail Partners III, L.P.'s Form 4 filing
Brilliant Earth Group, Inc. (BRLT) · filed Aug 26, 2026
- Accession no.
- 0001193125-26-368530
- Filed
- Aug 26, 2026, 4:15 PM ET
- Trade date
- Aug 24, 2026
- Filing delay
- 2 days
- Rule 10b5-1 plan
- Not checked
This filing lists 1 non-derivative transaction and 1 derivative transaction. 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 24, 2026 | Class B Common Stock | JOtherAcquired | +16,014 | –F1 | – | 31,848,071 | Indirect |
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 24, 2026 | Class A Common Stock | JOtherAcquired | +16,014 | –F1 | – | 31,848,071 | Indirect |
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
The reported transaction, which involves a purchase of a limited partner's interest in Mainsail Co-Investors III, L.P. ("MCOI"), may represent a change in the Reporting Persons' pecuniary interest in common units of Brilliant Earth, LLC (the "LLC Units") and shares of Class B common stock held by MCOI. For purposes of Section 16(b), such deemed purchase, for an aggregate consideration of $18,096, could be matchable against the sales reported on August 10, 2026, as reported on the Form 4 filed by the Reporting Persons on August 12, 2026. Accordingly, the Reporting Persons have fully disgorged to the Issuer, the Section 16(b) deemed profit of $2,033.
Referenced by the price of 1 transaction in Table I and 1 transaction in Table II.