Form 4: Summit Partners Sells 4M Klaviyo Shares After Conversion

Summit Partners, a 10% owner of Klaviyo, Inc., converted and sold 4 million shares of Series A Common Stock for $31.87 per share.

Summary

• Summit Partners, a 10% owner of Klaviyo, Inc. (KVYO), executed a transaction on September 8, 2025.
• The transaction involved the conversion of 4,000,000 shares of Series B Common Stock into an equal number of Series A Common Stock.
• Immediately following the conversion, 4,000,000 shares of Series A Common Stock were sold at a price of $31.87 per share.
• After these transactions, Summit Partners and its affiliated entities indirectly beneficially own 18,852,778 shares of Series B Common Stock.
• Series B Common Stock is convertible into Series A Common Stock on a one-for-one basis and has no expiration date, with automatic conversion triggers including holder election, a 66-2/3% vote, the seventh anniversary of Klaviyo's IPO, or certain transfers.

Sentiment

Score: 5

Explanation: The filing reports a significant sale by a 10% owner, which is a common event for institutional investors realizing gains. It does not provide operational or financial performance updates for Klaviyo, Inc., thus maintaining a neutral sentiment regarding the company's underlying business.

Positives

• Summit Partners realized a significant cash inflow from the sale of 4,000,000 shares at $31.87 per share, totaling approximately $127.48 million.

Negatives

• The sale by a 10% owner could be perceived negatively by the market, potentially indicating a reduction in conviction or a move to rebalance portfolios.
• The reduction in direct Series A Common Stock holdings to zero for the reported transaction suggests a strategic divestment of a portion of their liquid holdings.

Risks

• Potential market perception issues due to a large shareholder divesting a significant block of shares.
• Future sales by Summit Partners could exert downward pressure on Klaviyo's stock price, given their remaining substantial holding of 18,852,778 Series B Common Stock.

Future Outlook

The filing details a past transaction by a significant shareholder and does not contain explicit forward-looking statements or guidance from Klaviyo, Inc. management.

Industry Context

This transaction represents a portfolio management decision by a significant institutional investor, Summit Partners, which is common for private equity firms as their portfolio companies mature or go public. It does not directly reflect broader industry trends but rather a specific investment realization strategy.

Related Party Transactions

• The reported transactions involve Summit Partners, a 10% owner of Klaviyo, Inc., which is considered a related party. The conversion of Series B to Series A common stock and subsequent sale are standard actions for such institutional investors.

Stakeholder Impact

• Shareholders: The sale of a large block of shares by a significant investor could create downward pressure on the stock price in the short term and may prompt questions about the investor's long-term confidence in the company.

Key Dates

Recommendation

While a large insider sale by a significant investor can be a bearish signal, it is a common practice for private equity firms to monetize their investments after an IPO. This filing does not provide new information about Klaviyo's operational performance or future prospects. Investors should monitor future company performance and additional filings rather than reacting solely to this single transaction. The remaining substantial holding by Summit Partners suggests continued, albeit reduced, interest.

Keywords

Klaviyo, KVYO, Summit Partners, Insider Sale, Form 4, Beneficial Ownership, Series A Common Stock, Series B Common Stock, Stock Sale, Institutional Investor