Summit Partners Growth Equity Fund IX-B, L.P. — SEC Form 4 filings
SEC reporting owner CIK 1634426. 27 Form 4 filings on record with FilingPulse; latest filed 2026-08-13.
Transaction summary — filings shown
Covers all 27 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, …): 48.
- 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) | — | 2 | — | 2 legs · 12,209,988 sh · $65,022,562 | — |
Form 4 filings — Summit Partners Growth Equity Fund IX-B, L.P.
| Filed | Form | Issuer | Reported transactions | Source |
|---|---|---|---|---|
| 2026-08-13 | 4 | Klaviyo, Inc. (KVYO) jointly with SUMMIT PARTNERS L P, Summit Partners Growth Equity Fund IX-A, 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 |
| 2025-09-10 | 4 | Klaviyo, Inc. (KVYO) jointly with SUMMIT PARTNERS L P, Summit Partners Growth Equity Fund IX-A, 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 L P, Summit Partners Growth Equity Fund IX-A, 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 L P, Summit Partners Growth Equity Fund IX-A, L.P. | Other (J): 500,000 @ $0 | EDGAR |
| 2025-08-20 | 4 | LifeStance Health Group, Inc. (LFST) jointly with SUMMIT PARTNERS L P, Summit Partners Growth Equity Fund IX-A, 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 L P, Summit Partners Growth Equity Fund IX-A, 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 L P, Summit Partners Growth Equity Fund IX-A, 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 L P, Summit Partners Growth Equity Fund IX-A, 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 L P, Summit Partners Growth Equity Fund IX-A, 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 L P, Summit Partners Growth Equity Fund IX-A, 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 L P, Summit Partners Growth Equity Fund IX-A, L.P. | Other (J): 346,707 @ $0 | EDGAR |
| 2024-11-18 | 4 | Klaviyo, Inc. (KVYO) jointly with SUMMIT PARTNERS L P, Summit Partners Growth Equity Fund IX-A, 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 L P, Summit Partners Growth Equity Fund IX-A, 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 L P, Summit Partners Growth Equity Fund IX-A, 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 L P, Summit Partners Growth Equity Fund IX-A, 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 L P, Summit Partners Growth Equity Fund IX-A, 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 L P, Summit Partners Growth Equity Fund IX-A, 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 L P, Summit Partners Growth Equity Fund IX-A, 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 L P, Summit Partners Growth Equity Fund IX-A, 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 L P, Summit Partners Growth Equity Fund IX-A, 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 L P, Summit Partners Growth Equity Fund IX-A, 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 L P, Summit Partners Growth Equity Fund IX-A, 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 L P, Summit Partners Growth Equity Fund IX-A, 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 L P, Summit Partners Growth Equity Fund IX-A, 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 L P, Summit Partners Growth Equity Fund IX-A, 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 L P, Summit Partners Growth Equity Fund IX-A, 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 Partners Growth Equity Fund IX-A, L.P., SUMMIT INVESTORS GE IX/VC IV (UK), L.P., SUMMIT INVESTORS GE IX/VC IV, LLC, Summit Partners Entrepreneur Advisors Fund II, L.P. | 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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