McBee Brannin 4

What Happened
Brannin J. McBee, CoreWeave's Chief Development Officer, converted 481,245 shares of Class B common stock into Class A common stock and sold those 481,245 shares on March 9, 2026 for aggregate proceeds of approximately $34.94 million (weighted average ≈ $72.6 per share). The conversion volumes (300,000; 49,995; 81,255; 49,995) match the total shares sold, indicating the sales were of shares received via conversion.

Key Details

• Transaction date: March 9, 2026. Multiple open-market sales at prices ranging roughly $71.02 to $74.48 (weighted-average group prices reported by separate lots).
• Total sold: 481,245 shares; Total proceeds: ~$34,942,189; Approx. average price: ~$72.6/share.
• Conversions: Four conversion entries of Class B into Class A (see F1 — Class B convertible 1:1 to Class A).
• 10b5-1: At least one sale reported as pursuant to a Rule 10b5-1 trading plan adopted Nov 17, 2025 (F2).
• Holdings/beneficiaries: Some reported securities are held in related trusts (Brannin J. McBee 2022 Irrevocable Trust — spouse/minor beneficiary; Canis Major 2025 GRAT — reporting person trustee/beneficiary) (F10, F11, F7).
• Price reporting: Several price lines are weighted averages covering specific sub-ranges (F3–F9).
• Filing note: This Form 4 is Part 1 of 2; transactions continue on Part 2. The provided extract does not indicate a late filing flag.

Context
These transactions reflect conversions of Class B shares and subsequent open-market sales (not a straightforward purchase). Conversions of founder/insider Class B stock to Class A and immediate sales are common mechanics for liquidity; the presence of a 10b5-1 plan for at least some sales indicates pre-planned execution rather than ad hoc trading. For complete ownership after the trades and any additional transactions, review Part 2 of this filing and the full Form 4 on the SEC EDGAR site.