SUMMIT PARTNERS L P
SEC insider (Form 3/4/5 filer). CIK 0000830588. 10% Owner at Klaviyo, Inc. (KVYO) and 2 other issuers. 35 reported Form 4/5 transactions since Sep 2024; latest on Aug 11, 2026. Located in BOSTON, MA.
Companies SUMMIT PARTNERS L P has filed insider reports for
- Klaviyo, Inc. (KVYO): 10% Owner
- Solo Brands, Inc. (SBDS): 10% Owner
- LifeStance Health Group, Inc. (LFST): 10% Owner
SUMMIT PARTNERS L P
CIK: 0000830588
Transaction Breakdown
Open Market Buys (P)0 (0.0%)
High conviction signal
Open Market Sales (S)16 (45.7%)
Position reduction
Option Exercises (M)0 (0.0%)
Derivative conversions
Awards (A)0 (0.0%)
Compensation grants
Other (G, F, J, C, D, …)19 (54.3%)
Gifts, tax withholding, conversions, dispositions to the issuer and other codes
Discretionary Trading P&L
Holdings
Transaction History (35 total)
- Aug 11, 2026KVYO
Klaviyo, Inc.
ConversionIndirect5M shares- - Aug 11, 2026KVYO
Klaviyo, Inc.
SaleIndirect5M shares at avg. $17.71$88.5M - Jan 1, 2026SBDS
Solo Brands, Inc.
ConversionIndirect354.2K shares- - Jan 1, 2026SBDS
Solo Brands, Inc.
OtherIndirect354.2K shares- - Sep 8, 2025KVYO
Klaviyo, Inc.
ConversionIndirect4M shares- - Sep 8, 2025KVYO
Klaviyo, Inc.
SaleIndirect4M shares at avg. $31.87$127.5M - Aug 25, 2025KVYO
Klaviyo, Inc.
ConversionIndirect975K shares- - Aug 25, 2025KVYO
Klaviyo, Inc.
SaleIndirect975K shares at avg. $30.01$29.3M - Aug 21, 2025KVYO
Klaviyo, Inc.
OtherIndirect500K shares- - Aug 18, 2025LFST
LifeStance Health Group, Inc.
SaleDirect8.4M shares at avg. $5.07$42.6M
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Aug 11, 2026 |  KVYO Klaviyo, Inc. | Conversion | 5,000,000 | - | $0 | Indirect |
| Aug 11, 2026 | KVYO Klaviyo, Inc. | Sale | 5,000,000 | $17.71 | $88,550,000 | Indirect |
| Jan 1, 2026 |  SBDS Solo Brands, Inc. | Conversion | 354,189 | - | $0 | Indirect |
| Jan 1, 2026 | SBDS Solo Brands, Inc. | Other | 354,189 | - | $0 | Indirect |
| Sep 8, 2025 | KVYO Klaviyo, Inc. | Conversion | 4,000,000 | - | - | Indirect |
| Sep 8, 2025 | KVYO Klaviyo, Inc. | Sale | 4,000,000 | $31.87 | $127,480,000 | Indirect |
| Aug 25, 2025 | KVYO Klaviyo, Inc. | Conversion | 975,000 | - | - | Indirect |
| Aug 25, 2025 | KVYO Klaviyo, Inc. | Sale | 975,000 | $30.01 | $29,259,750 | Indirect |
| Aug 21, 2025 | KVYO Klaviyo, Inc. | Other | 500,000 | - | - | Indirect |
| Aug 18, 2025 |  LFST LifeStance Health Group, Inc. | Sale | 8,407,643 | $5.07 | $42,626,750 | Direct |
1-10 of 35 transactions