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Magnetar Reports Expiration of 3.0M Share Collar on CoreWeave

Medium SignificanceSeptember 18, 2026 at 10:58:14 PM UTC

CoreWeave, Inc.

$CRWV4CIK: 0001769628

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Filing Summary

Magnetar Reports Expiration of 3.0M Share Collar on CoreWeave

Company: CoreWeave, Inc. (CRWV) Form: 4 | Filed: September 18, 2026 Significance: Medium

Insider: Magnetar Financial LLC Title: N/A | Relationship: 10% Owner

Transaction Details: • Type: Derivative Expiration (Collar) • Underlying Shares: 3,000,000 Class A Common Stock • Strike Prices: Put $75 / Call $180 • Price / Value: $0.00 / $0.00 (Expired Unexercised) • Post-Transaction Derivative Holdings: 0

Key Insight: A 3.0M share collar hedge established by Magnetar in August 2025 expired unexercised as CoreWeave traded between the $75 put and $180 call strikes. No common stock was transferred or diluted.

Market Context: Release of the collar hedge removes synthetic upside caps and downside protection across Magnetar-managed entities, covering 0.55% of shares outstanding.

Comprehensive Analysis

SEC Filing Analysis: CoreWeave, Inc. (CRWV)

Executive Summary

  • Trading Significance: Medium
  • Key Takeaway: Magnetar Financial LLC allowed European-style collar option positions covering 3,000,000 shares to expire unexercised and out-of-the-money at zero value.
  • Market Impact: Neutral; no physical shares were bought or sold in the market, resulting in zero share dilution or direct selling pressure.

Company Information

FieldValue
CompanyCoreWeave, Inc.
Ticker SymbolCRWV
CIK0001769628
IndustryServices-Prepackaged Software [7372]

Insider Information

FieldValue
NameMagnetar Financial LLC (and affiliates)
CIK0001352851
Title/PositionN/A
Relationship10% Owner

Transaction Details

FieldValue
Form Type4
Transaction Date2026-09-18
Transaction CodeE (Expiration of derivative)
Security TypeCall option ($180 strike) & Put option ($75 strike)
Shares Involved3,000,000 (aggregate underlying)
Price Per Share$0.00
Total Value$0.00
Shares Owned After0 (options)
Ownership TypeIndirect

Financial Impact Assessment

Transaction Materiality

MetricValue
Transaction Value$0.00
% of Market Cap0.00%
Shares Transacted (Underlying)3,000,000
% of Shares Outstanding0.55%
Post-Transaction OwnershipUnderlying common shares remain with funds
Materiality AssessmentModerate to Significant (by share count)

Impact Evaluation

  • Market Cap Context: With a market capitalization of $45.77B across 545,570,000 shares outstanding, the 3,000,000 shares underlying the expired collar represent an economic exposure of roughly $225M–$540M at the respective strike boundaries.
  • Ownership Concentration: Magnetar remains a major 10% beneficial owner across its funds; unhedged common equity exposure is now fully restored on this tranche.
  • Dilution Impact: None. The options expired unexercised for zero consideration, creating no new share issuance or cancellation.
  • Transaction Significance: Medium. While the dollar transaction value is $0, the expiration eliminates downside insurance ($75 put) and uncaps upside potential ($180 call) on 0.55% of the company's total equity base.

Market Impact Analysis

Stock Impact Prediction

  • Direction: Neutral
  • Reasoning: This event reflects the scheduled maturity of an institutional hedging collar established in August 2025. Because CRWV stock closed between $75 and $180, neither put nor call strikes were triggered, resulting in zero open-market trade activity.

Volume & Sentiment

  • Expected Volume Impact: Negligible immediate volume impact since no shares were transacted.
  • Sentiment Indicator: Neutral; signals the expiration of an existing hedge rather than an active directional accumulation or divestment.

Additional Context

Transaction Notes

  • Timing: Settled upon final expiration on September 18, 2026.
  • Special Circumstances: As disclosed in Footnote 1, both call ($180) and put ($75) options expired unexercised for no value pursuant to collar contracts entered into on August 18, 2025.
Topics:#CoreWeave#CRWV#SECFiling#Form4#Magnetar#CollarExpiration#StockAlert#Derivatives

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