SUMMIT PARTNERS L P — SEC Form 4 filings
SEC reporting owner CIK 830588. 28 Form 4 filings on record with FilingPulse; latest filed 2026-08-13.
Transaction summary — filings shown
Covers all 28 filings on record, filed 2024-05-29 to 2026-08-13. Counts and totals are arithmetic on values as filed — descriptive data, not a recommendation.
- Open-market purchases (code P, non-derivative): none reported.
- Open-market sales (code S, non-derivative): 25 legs across 25 filings — 45,252,132 shares, $1,073,947,677 total (shares × price as filed).
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 51.
- Largest priced transaction: sale of 6,500,000 shares @ $30.01 ($195,065,000) in Klaviyo, Inc., filed 2025-08-15.
By issuer — same filings
Open-market purchase/sale legs on non-derivative securities, grouped by issuer. Role is as filed on the newest filing for that issuer. Dollar totals cover priced legs only (shares × price as filed). Ordered by priced transaction value, largest first.
| Issuer | Role (as filed) | Filings | Purchases (P) | Sales (S) | Other legs |
|---|---|---|---|---|---|
| Klaviyo, Inc. (KVYO) | 10% owner | 25 | — | 23 legs · 33,042,144 sh · $1,008,925,115 | 48 |
| LifeStance Health Group, Inc. (LFST) | 10% owner | 2 | — | 2 legs · 12,209,988 sh · $65,022,562 | — |
| Solo Brands, Inc. (SBDS) | 10% owner | 1 | — | — | 3 |
Form 4 filings — SUMMIT PARTNERS L P
| Filed | Form | Issuer | Reported transactions | Source |
|---|---|---|---|---|
| 2026-08-13 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P., Summit Partners Co-Invest (Kiwi), LP, SUMMIT INVESTORS GE IX/VC IV, LLC, SUMMIT INVESTORS GE IX/VC IV (UK), L.P. | Conversion (C): 5,000,000 · Sale (S): 5,000,000 @ $17.71 · Conversion (C): 5,000,000 (derivative) | EDGAR |
| 2026-01-05 | 4 | Solo Brands, Inc. (SBDS) jointly with Summit Partners Growth Equity Fund X-A, L.P., Summit Partners Growth Equity Fund X-B, L.P., Summit Partners Growth Equity Fund X-C, L.P., SUMMIT INVESTORS X, LLC, SUMMIT INVESTORS X (UK), L.P., Summit Partners Subordinated Debt Fund V-A, L.P., Summit Partners Subordinated Debt Fund V-B, L.P., SP-SS AGGREGATOR LLC | Conversion (C): 354,189 · Other (J): 354,189 · Conversion (C): 354,189 (derivative) @ $0 | EDGAR |
| 2025-09-10 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P., Summit Partners Co-Invest (Kiwi), LP, SUMMIT INVESTORS GE IX/VC IV, LLC, SUMMIT INVESTORS GE IX/VC IV (UK), L.P. | Conversion (C): 4,000,000 · Sale (S): 4,000,000 @ $31.87 · Conversion (C): 4,000,000 (derivative) @ $0 | EDGAR |
| 2025-08-27 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P., Summit Partners Co-Invest (Kiwi), LP, SUMMIT INVESTORS GE IX/VC IV, LLC, SUMMIT INVESTORS GE IX/VC IV (UK), L.P. | Conversion (C): 975,000 · Sale (S): 975,000 @ $30.01 · Conversion (C): 975,000 (derivative) @ $0 | EDGAR |
| 2025-08-22 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P. | Other (J): 500,000 @ $0 | EDGAR |
| 2025-08-20 | 4 | LifeStance Health Group, Inc. (LFST) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P., SUMMIT INVESTORS GE IX/VC IV, LLC, SUMMIT INVESTORS GE IX/VC IV (UK), L.P., Summit Partners Entrepreneur Advisors Fund II, L.P. | Sale (S): 8,407,643 @ $5.07 | EDGAR |
| 2025-08-15 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P., Summit Partners Co-Invest (Kiwi), LP, SUMMIT INVESTORS GE IX/VC IV, LLC, SUMMIT INVESTORS GE IX/VC IV (UK), L.P. | Conversion (C): 7,000,000 · Sale (S): 6,500,000 @ $30.01 · Conversion (C): 7,000,000 (derivative) @ $0 | EDGAR |
| 2025-06-05 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P., Summit Partners Co-Invest (Kiwi), LP, SUMMIT INVESTORS GE IX/VC IV, LLC, SUMMIT INVESTORS GE IX/VC IV (UK), L.P. | Conversion (C): 4,000,000 · Sale (S): 4,000,000 @ $33.35 · Conversion (C): 4,000,000 (derivative) @ $0 | EDGAR |
| 2025-05-20 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P., Summit Partners Co-Invest (Kiwi), LP, SUMMIT INVESTORS GE IX/VC IV, LLC, SUMMIT INVESTORS GE IX/VC IV (UK), L.P. | Conversion (C): 4,000,000 · Sale (S): 4,000,000 @ $33 · Conversion (C): 4,000,000 (derivative) @ $0 | EDGAR |
| 2025-03-17 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P., Summit Partners Co-Invest (Kiwi), LP, SUMMIT INVESTORS GE IX/VC IV, LLC, SUMMIT INVESTORS GE IX/VC IV (UK), L.P. | Conversion (C): 2,000,000 · Sale (S): 2,000,000 @ $32.44 · Conversion (C): 2,000,000 (derivative) @ $0 | EDGAR |
| 2024-12-11 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P., Summit Partners Co-Invest (Kiwi), LP, SUMMIT INVESTORS GE IX/VC IV, LLC, SUMMIT INVESTORS GE IX/VC IV (UK), L.P. | Conversion (C): 2,100,000 · Sale (S): 2,100,000 @ $39.15 · Conversion (C): 2,100,000 (derivative) @ $0 | EDGAR |
| 2024-11-25 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P. | Other (J): 346,707 @ $0 | EDGAR |
| 2024-11-18 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P., Summit Partners Co-Invest (Kiwi), LP, SUMMIT INVESTORS GE IX/VC IV, LLC, SUMMIT INVESTORS GE IX/VC IV (UK), L.P. | Conversion (C): 3,500,000 · Sale (S): 3,153,293 @ $36.20 · Conversion (C): 3,500,000 (derivative) @ $0 | EDGAR |
| 2024-09-17 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P., Summit Partners Co-Invest (Kiwi), LP, SUMMIT INVESTORS GE IX/VC IV, LLC, SUMMIT INVESTORS GE IX/VC IV (UK), L.P. | Conversion (C): 113,561 · Sale (S): 113,561 @ $31.47 · Conversion (C): 113,561 (derivative) @ $0 | EDGAR |
| 2024-09-16 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P., Summit Partners Co-Invest (Kiwi), LP, SUMMIT INVESTORS GE IX/VC IV, LLC, SUMMIT INVESTORS GE IX/VC IV (UK), L.P. | Conversion (C): 107,205 · Sale (S): 107,205 @ $31.33 · Conversion (C): 107,205 (derivative) @ $0 | EDGAR |
| 2024-09-13 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P., Summit Partners Co-Invest (Kiwi), LP, SUMMIT INVESTORS GE IX/VC IV, LLC, SUMMIT INVESTORS GE IX/VC IV (UK), L.P. | Conversion (C): 2,942 · Sale (S): 2,942 @ $31.01 · Conversion (C): 2,942 (derivative) @ $0 | EDGAR |
| 2024-09-05 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P., Summit Partners Co-Invest (Kiwi), LP, SUMMIT INVESTORS GE IX/VC IV, LLC, SUMMIT INVESTORS GE IX/VC IV (UK), L.P. | Conversion (C): 6,039 · Sale (S): 6,039 @ $31.53 · Conversion (C): 6,039 (derivative) @ $0 | EDGAR |
| 2024-09-04 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P., Summit Partners Co-Invest (Kiwi), LP, SUMMIT INVESTORS GE IX/VC IV, LLC, SUMMIT INVESTORS GE IX/VC IV (UK), L.P. | Conversion (C): 1,300 · Sale (S): 1,300 @ $31.64 · Conversion (C): 1,300 (derivative) @ $0 | EDGAR |
| 2024-09-03 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P., Summit Partners Co-Invest (Kiwi), LP, SUMMIT INVESTORS GE IX/VC IV, LLC, SUMMIT INVESTORS GE IX/VC IV (UK), L.P. | Conversion (C): 16,931 · Sale (S): 16,931 @ $31.55 · Conversion (C): 16,931 (derivative) @ $0 | EDGAR |
| 2024-08-30 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P., Summit Partners Co-Invest (Kiwi), LP, SUMMIT INVESTORS GE IX/VC IV, LLC, SUMMIT INVESTORS GE IX/VC IV (UK), L.P. | Conversion (C): 27,445 · Sale (S): 27,445 @ $31.68 · Conversion (C): 27,445 (derivative) @ $0 | EDGAR |
| 2024-08-29 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P., Summit Partners Co-Invest (Kiwi), LP, SUMMIT INVESTORS GE IX/VC IV, LLC, SUMMIT INVESTORS GE IX/VC IV (UK), L.P. | Conversion (C): 67,436 · Sale (S): 67,436 @ $32.29 · Conversion (C): 67,436 (derivative) @ $0 | EDGAR |
| 2024-08-28 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P., Summit Partners Co-Invest (Kiwi), LP, SUMMIT INVESTORS GE IX/VC IV, LLC, SUMMIT INVESTORS GE IX/VC IV (UK), L.P. | Conversion (C): 90,502 · Sale (S): 90,502 @ $32.27 · Conversion (C): 90,502 (derivative) @ $0 | EDGAR |
| 2024-08-27 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P., Summit Partners Co-Invest (Kiwi), LP, SUMMIT INVESTORS GE IX/VC IV, LLC, SUMMIT INVESTORS GE IX/VC IV (UK), L.P. | Conversion (C): 305,638 · Sale (S): 305,638 @ $32.33 · Conversion (C): 305,638 (derivative) @ $0 | EDGAR |
| 2024-08-26 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P., Summit Partners Co-Invest (Kiwi), LP, SUMMIT INVESTORS GE IX/VC IV, LLC, SUMMIT INVESTORS GE IX/VC IV (UK), L.P. | Conversion (C): 82,499 · Sale (S): 82,499 @ $31.76 · Conversion (C): 82,499 (derivative) @ $0 | EDGAR |
| 2024-08-23 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P., Summit Partners Co-Invest (Kiwi), LP, SUMMIT INVESTORS GE IX/VC IV, LLC, SUMMIT INVESTORS GE IX/VC IV (UK), L.P. | Conversion (C): 113,850 · Sale (S): 113,850 @ $31.76 · Conversion (C): 113,850 (derivative) @ $0 | EDGAR |
| 2024-08-22 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P., Summit Partners Co-Invest (Kiwi), LP, SUMMIT INVESTORS GE IX/VC IV, LLC, SUMMIT INVESTORS GE IX/VC IV (UK), L.P. | Conversion (C): 135,902 · Sale (S): 135,902 @ $31.95 · Conversion (C): 135,902 (derivative) @ $0 | EDGAR |
| 2024-08-20 | 4 | Klaviyo, Inc. (KVYO) jointly with Summit Partners Growth Equity Fund IX-A, L.P., Summit Partners Growth Equity Fund IX-B, L.P., Summit Partners Co-Invest (Kiwi), LP, SUMMIT INVESTORS GE IX/VC IV, LLC, SUMMIT INVESTORS GE IX/VC IV (UK), L.P. | Conversion (C): 242,601 · Sale (S): 242,601 @ $31.78 · Conversion (C): 242,601 (derivative) @ $0 | EDGAR |
| 2024-05-29 | 4 | LifeStance Health Group, Inc. (LFST) jointly with SUMMIT MASTER COMPANY, LLC, SUMMIT PARTNERS ENTREPRENEUR ADVISORS GP II, LLC, SUMMIT PARTNERS GE IX, L.P., SUMMIT PARTNERS GE IX, LLC, Summit Investors Management, LLC | Sale (S): 3,802,345 @ $5.89 | EDGAR |
FilingPulse's Form 4 archive currently extends back to 2024-01-11 and is expanding backward through EDGAR history — earlier filings by this insider may not be indexed yet. Names and roles are shown as filed.
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