CoreWeave (CRWV) 10% Owner Magnetar Financial Sells Shares

What Happened

• Magnetar Financial LLC (reported as a 10% owner/adviser to multiple Magnetar funds) sold a series of open-market/private-sale dispositions in CoreWeave (CRWV) on August 13, 2026. The filing shows roughly 1,921,259 shares sold across multiple trades at reported prices of $107.75, $110.98 and $115.61, for aggregate proceeds of approximately $213.8 million.
• All reported transactions are sales (code "S"). Sales are dispositions of shares and are not the same signal as insider purchases; they may reflect fund rebalancing or other institutional activity rather than a company-specific view.

Key Details

• Transaction date: 2026-08-13; Form 4 filed: 2026-08-14 (appears to be filed the next day).
• Aggregate shares sold: ~1,921,259; aggregate proceeds: ~$213,781,351.
• Reported trade prices: $107.75, $110.98, $115.61 (footnote F1 notes the $107.75 entries are a weighted average for multiple trades priced between $107.61 and $108.48).
• Holdings after the transaction: Not specified in the summary provided here—see the full Form 4 for post-transaction ownership amounts.
• Notable footnotes: Multiple footnotes (F10–F16) identify the specific Magnetar funds that directly hold the securities (e.g., Magnetar Lake Credit Fund LLC, Magnetar Structured Credit Fund, Purpose Alternative Credit Fund entities, Magnetar Alpha Star Fund LLC, Magnetar Longhorn Fund LP, Magnetar SC Fund Ltd, CW Opportunity funds). Footnote F2 explains Magnetar Financial serves as investment adviser/manager to those funds; F3–F4 note the parent/management structure and a disclaimer of beneficial ownership except for pecuniary interest.
• Timeliness: Filed one day after the trades (Aug 14 for Aug 13 transactions), which appears timely for a Form 4 filing.

Context

• This filing reflects institutional selling by a reported 10% owner/adviser and not an executive officer or director trade. Institutional sales can be driven by portfolio management, redemptions, or rebalancing and do not necessarily indicate a change in company fundamentals.
• If you track insider activity for signal purposes, monitor follow-up filings (Forms 4, 13D/G) for changes in ownership levels or disclosed plans that could indicate a strategic shift. For exact per-trade timing, price per trade, and post-transaction holdings, consult the full SEC Form 4 (accession 0001104659-26-097431).