Summary
Updated Aug 31, 2026
Magnetar Financial LLC is 10% Owner of CoreWeave, Inc. (CRWV). 52 SEC Form 4 filings on record going back to 2025, most recently on 19 August 2026. Most recent open-market trade: sold $104K of CRWV on 19 August 2026. Lifetime open-market purchases: $9.58B. Lifetime open-market sales: $22.58B. Historical track record: 5/5 stars across 59 tracked purchases.
Recent Transactions
20Every recent SEC Form 4 transaction Magnetar Financial LLC has reported, most recent first.
Track Record
InsiderAlpha computes a forward-return-based score for every insider with enough Form 4 purchase history. The metrics below reflect realized performance after each tracked open-market purchase.
| Metric | Value |
|---|---|
| InsiderAlpha rating | ★★★★★ (5/5) |
| Total purchases tracked | 59 |
| Purchases with forward-return data | 59 |
| 30-day win rate | 100% |
| 90-day win rate | 0% |
| Avg 5-day return | -3.26% |
| Avg 30-day return | +27.36% |
| Avg 90-day return | -22.51% |
| Best 30-day return | +46.75% |
Trading Pattern
InsiderAlpha's records for Magnetar Financial LLC go back to 2025: 52 primary Form 4 filings, an average of 26.0 per year. The typical open-market purchase is $162.37M (59 buys totaling $9.58B). The largest single buy on record is $2.50B of CRWV in 2025. Sales side: 863 recorded sales totaling $22.58B, so the filing history runs sell-heavy by dollar value. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Magnetar Financial LLC files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- Brian M. Venturo - $1.15B of CRWV open-market activity in the last 12 months
- Michael N. Intrator - $817.29M of CRWV open-market activity in the last 12 months
- Brannin McBee - $533.03M of CRWV open-market activity in the last 12 months
- Jack D. Cogen - $240.65M of CRWV open-market activity in the last 12 months
- Nitin Agrawal - $45.37M of CRWV open-market activity in the last 12 months
- Chen Goldberg - $21.59M of CRWV open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
What is Magnetar Financial LLC?
Magnetar Financial LLC is a corporate entity, tracked as 10% Owner of CoreWeave, Inc. (CRWV). InsiderAlpha holds 52 primary Form 4 filings for it, the earliest from 2025, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Magnetar Financial LLC submitted recently?
4 primary Form 4 filings in the last 90 days, covering 1 company.
Has Magnetar Financial LLC been buying or selling stock?
Recorded transactions: 59 open-market purchases ($9.58B) and 863 open-market sales ($22.58B) across all tracked filings.
How accurate is Magnetar Financial LLC's historical track record?
Across 59 tracked purchases, Magnetar Financial LLC averaged +27.4% avg 30-day return with a 100% 30-day win rate. InsiderAlpha rates the track record at 5/5 stars.
Where can I see all of Magnetar Financial LLC's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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