Form 4: Insider Buys $4M SI Stock, Converts Preferred Shares

LSV Associates II and affiliated entities acquired 266,666 shares of Shoulder Innovations, Inc. common stock for $4 million and converted preferred shares into common stock.

Summary

• Reporting persons LSV Associates II, LLC, Lightstone Ventures II, L.P., Lightstone Ventures II (A), L.P., Henry A. Plain, Jr., and Jean George reported transactions in Shoulder Innovations, Inc. (SI) common stock.
• On August 1, 2025, 266,666 shares of common stock were acquired at a price of $15 per share, totaling $4,000,000.
• Additionally, 1,618,470 shares of common stock were acquired through the automatic conversion of Series C and Series D Convertible Preferred Stock.
• Immediately prior to the Issuer's initial public offering, Series C Convertible Preferred Stock (20,930,233 shares) and Series D Convertible Preferred Stock (9,950,208 shares) were converted into common stock at a ratio of one-for-0.052410901.
• Following these transactions, the reporting persons beneficially own a total of 1,885,136 shares of common stock indirectly.
• Of the total, 1,781,479 shares are held by Lightstone Ventures II, L.P. and 103,657 shares by Lightstone Ventures II (A), L.P.
• The transactions were made pursuant to a Rule 10b5-1(c) trading plan.

Sentiment

Score: 7

Explanation: The filing indicates a significant insider purchase of common stock at a fixed price, alongside the expected conversion of preferred shares due to an IPO. This insider buying suggests confidence from a former 10% owner, which is generally a positive signal for investors.

Positives

• Significant insider purchase of 266,666 common shares at $15 per share, totaling $4,000,000, indicating confidence in the company's valuation.
• Conversion of preferred stock into common stock simplifies the capital structure, typically a positive step for public companies.

Future Outlook

NA

Industry Context

NA

Related Party Transactions

• The reported transactions involve entities and individuals (LSV Associates II, Lightstone Ventures, Henry A. Plain, Jr., Jean George) who are former 10% owners and managing directors of the general partner of the investment funds, making these related party transactions.

Stakeholder Impact

• Shareholders: The significant insider purchase and conversion of preferred shares into common stock by a former major investor could be viewed positively, signaling confidence in the company's future performance and potentially increasing liquidity for common shares.

Key Dates

Recommendation

The filing reports a significant insider purchase of common stock by a former 10% owner, which is generally a positive signal of confidence. However, without broader financial context, company performance data, or market valuation, a 'hold' recommendation is prudent. The conversion of preferred shares is a standard event tied to an IPO, not necessarily indicative of future performance beyond capital structure simplification. Investors should await the full IPO prospectus and subsequent financial reports for a comprehensive assessment before making a 'buy' or 'sell' decision.

Keywords

SHOULDER INNOVATIONS, SI, SEC Form 4, Insider Trading, Stock Purchase, Preferred Stock Conversion, Equity, Investment, LSV Associates II, Lightstone Ventures, Rule 10b5-1