Form 4: CoStar CTO Frank Simuro Sells Shares for Tax Obligations

CoStar Group's Chief Technology Officer, Frank Simuro, disposed of 11,107 shares of common stock to cover tax liabilities, reducing his direct beneficial ownership to 414,491 shares.

Summary

• Frank Simuro, Chief Technology Officer of CoStar Group, Inc. (CSGP), reported a transaction involving company common stock.
• On March 15, 2026, Simuro disposed of 11,107 shares of CoStar Group common stock.
• The transaction code 'F' indicates that these shares were withheld to cover tax obligations related to equity compensation.
• The shares were valued at $43.63 per share, based on the closing price on March 13, 2026, the last preceding business day.
• Following this transaction, Simuro directly beneficially owns 414,491 shares of CoStar Group common stock.
• The transaction was made pursuant to a Rule 10b5-1(c) plan, indicating a pre-arranged disposition.

Sentiment

Score: 5

Explanation: StockSavvy.ai views this as a routine, non-eventful insider transaction for tax purposes, which does not reflect a change in the company's operational performance or the executive's long-term outlook.

Positives

• The transaction was executed under a pre-arranged Rule 10b5-1(c) plan, indicating a structured and pre-scheduled disposition rather than an opportunistic sale.
• Frank Simuro retains a significant beneficial ownership of 414,491 shares of CoStar Group common stock after the transaction, demonstrating continued alignment with shareholder interests.

Negatives

• Frank Simuro disposed of 11,107 shares of CoStar Group common stock, which reduces his direct beneficial ownership in the company.

Future Outlook

NA

Industry Context

StockSavvy.ai notes that routine insider transactions, such as those for tax withholding, are common and generally do not signal a change in company fundamentals or management's confidence. The use of a 10b5-1 plan reflects standard corporate governance practices for executives managing their equity compensation.

Comparison to Industry Standards

• Routine tax-related share disposals by executives are standard practice across industries for managing equity compensation.
• The volume of shares disposed (11,107) represents a small fraction of the executive's total beneficial ownership (414,491 shares), indicating a minor adjustment rather than a significant reduction in stake.
• No specific comparable companies, projects, or results are directly relevant as this is a standard insider transaction for tax purposes.

Stakeholder Impact

• Shareholders: Minimal direct impact as this is a routine tax-related transaction and the executive retains a substantial holding, suggesting continued alignment of interests.
• Employees, Customers, Suppliers, Creditors: No direct impact from this specific filing.

Key Dates

Recommendation

This Form 4 reports a routine insider transaction for tax withholding purposes, which is a common occurrence for executives with equity compensation. It does not indicate any change in the company's fundamentals, strategic direction, or the executive's confidence in the company. The executive retains a significant stake, suggesting continued alignment with shareholder interests. Therefore, the filing itself provides no new information to warrant a change in investment posture.

Keywords

CoStar Group, CSGP, Frank Simuro, Chief Technology Officer, CTO, insider transaction, Form 4, stock sale, tax withholding, beneficial ownership, Rule 10b5-1