Magnetar’s CoreWeave (CRWV) collar options expire unexercised

Rhea-AI Filing Summary

CoreWeave, Inc. reported that a collar hedge held by Magnetar-affiliated funds on its Class A Common Stock expired without being exercised. On March 20, 2026, paired call and put options entered on August 15, 2025 expired for no value because the share price finished between the call and put strike levels.

The positions were short derivative contracts referencing Class A Common Stock and are now reported with zero derivatives remaining after expiration. The options were held indirectly by entities including Magnetar Lake Credit Fund LLC, Magnetar Alpha Star Fund LLC, Magnetar Capital Master Fund, Ltd. and CW Opportunity LLC, with Magnetar parties disclaiming beneficial ownership except for any pecuniary interest.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Magnetar Financial LLC

(Last) (First) (Middle)

1603 ORRINGTON AVENUE

13TH FLOOR

(Street)

EVANSTON ILLINOIS 60201

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
CoreWeave, Inc. [ CRWV ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/20/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
X	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Call option (obligation to sell)	$140	03/20/2026		E/K(1)			235,802	03/20/2026	03/20/2026	Class A Common Stock	235,802	$0	0	I	Footnotes(2)(3)(4)(5)
Put option (right to sell)	$80	03/20/2026		E/K(1)(9)			235,802	03/20/2026	03/20/2026	Class A Common Stock	235,802	$0	0	I	Footnotes(2)(3)(4)(5)
Call option (obligation to sell)	$135	03/20/2026		E/K(1)			77,050	03/20/2026	03/20/2026	Class A Common Stock	77,050	$0	0	I	Footnotes(2)(3)(4)(6)
Put option (right to sell)	$80	03/20/2026		E/K(1)(9)			77,050	03/20/2026	03/20/2026	Class A Common Stock	77,050	$0	0	I	Footnotes(2)(3)(4)(6)
Call option (obligation to sell)	$140	03/20/2026		E/K(1)			77,050	03/20/2026	03/20/2026	Class A Common Stock	77,050	$0	0	I	Footnotes(2)(3)(4)(6)
Put option (right to sell)	$80	03/20/2026		E/K(1)(9)			77,050	03/20/2026	03/20/2026	Class A Common Stock	77,050	$0	0	I	Footnotes(2)(3)(4)(6)
Call option (obligation to sell)	$135	03/20/2026		E/K(1)			7,967	03/20/2026	03/20/2026	Class A Common Stock	7,967	$0	0	I	Footnotes(2)(3)(4)(7)
Put option (right to sell)	$80	03/20/2026		E/K(1)(9)			7,967	03/20/2026	03/20/2026	Class A Common Stock	7,967	$0	0	I	Footnotes(2)(3)(4)(7)
Call option (obligation to sell)	$140	03/20/2026		E/K(1)			7,966	03/20/2026	03/20/2026	Class A Common Stock	7,966	$0	0	I	Footnotes(2)(3)(4)(7)
Put option (right to sell)	$80	03/20/2026		E/K(1)(9)			7,966	03/20/2026	03/20/2026	Class A Common Stock	7,966	$0	0	I	Footnotes(2)(3)(4)(7)
Call option (obligation to sell)	$135	03/20/2026		E/K(1)			587,701	03/20/2026	03/20/2026	Class A Common Stock	587,701	$0	0	I	Footnotes(2)(3)(4)(8)
Put option (right to sell)	$80	03/20/2026		E/K(1)(9)			587,701	03/20/2026	03/20/2026	Class A Common Stock	587,701	$0	0	I	Footnotes(2)(3)(4)(8)
Call option (obligation to sell)	$140	03/20/2026		E/K(1)			587,701	03/20/2026	03/20/2026	Class A Common Stock	587,701	$0	0	I	Footnotes(2)(3)(4)(8)
Put option (right to sell)	$80	03/20/2026		E/K(1)(9)			587,701	03/20/2026	03/20/2026	Class A Common Stock	587,701	$0	0	I	Footnotes(2)(3)(4)(8)

1. Name and Address of Reporting Person^*

Magnetar Financial LLC

(Last) (First) (Middle)

1603 ORRINGTON AVENUE

13TH FLOOR

(Street)

EVANSTON ILLINOIS 60201

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Magnetar Capital Partners LP

(Last) (First) (Middle)

1603 ORRINGTON AVENUE

13TH FLOOR

(Street)

EVANSTON ILLINOIS 60201

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Supernova Management LLC

(Last) (First) (Middle)

1603 ORRINGTON AVENUE

13TH FLOOR

(Street)

EVANSTON ILLINOIS 60201

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Snyderman David J.

(Last) (First) (Middle)

1603 ORRINGTON AVENUE

13TH FLOOR

(Street)

EVANSTON ILLINOIS 60201

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

Explanation of Responses:

1. In connection with the expiration of a call option and a put option entered into on August 15, 2025, as part of a collar arrangement, both options expired unexercised and for no value on March 20, 2026, as the closing price of the Class A Common Stock on such date was between the call strike price and the put strike price.

2. Magnetar Financial LLC ("Magnetar Financial") serves as the investment adviser to each of Magnetar Capital Master Fund, Ltd and CW Opportunity LLC and the manager of Magnetar Alpha Star Fund LLC and Magnetar Lake Credit Fund LLC (collectively, the "Magnetar Funds").

3. Magnetar Capital Partners LP ("Magnetar Capital Partners") is the sole member and parent holding company of Magnetar Financial. Supernova Management LLC ("Supernova Management") is the general partner of Magnetar Capital Partners. The administrative manager of Supernova Management is David J. Snyderman, a citizen of the United States of America.

4. Each of the Magnetar Funds, Magnetar Financial, Magnetar Capital Partners, Supernova Management and David J. Snyderman disclaims beneficial ownership of these shares of Common Stock of the Issuer, except to the extent of its or his pecuniary interest therein.

5. These securities are held directly by Magnetar Lake Credit Fund LLC.

6. These securities are held directly by Magnetar Alpha Star Fund LLC.

7. These securities are held directly by Magnetar Capital Master Fund, Ltd.

8. These securities are held directly by CW Opportunity LLC.

9. Expiration of a long derivative security for no value, transaction code "K" only.

	/s/ Hayley A. Stein, Attorney-in-Fact for David J. Snyderman, as Administrative Manager of Supernova Management LLC, which is the General Partner of Magnetar Capital Partners LP, which is in turn the Sole Member of Magnetar Financial LLC	03/20/2026
	/s/ Hayley A. Stein, Attorney-in-Fact for David J. Snyderman, as Administrative Manager of Supernova Management LLC, which is the General Partner of Magnetar Capital Partners LP	03/20/2026
	/s/ Hayley A. Stein, Attorney-in-Fact for David J. Snyderman, as Administrative Manager of Supernova Management LLC	03/20/2026
	/s/ Hayley A. Stein, Attorney-in-Fact for David J. Snyderman	03/20/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What did the CoreWeave (CRWV) Form 4 filed by Magnetar report?

The Form 4 reports the expiration of a collar hedge on CoreWeave Class A Common Stock. Short call and put options entered on August 15, 2025 expired unexercised and for no value on March 20, 2026, leaving no remaining derivative position from this collar.

Were any CoreWeave (CRWV) shares bought or sold in this Magnetar Form 4?

No open-market buys or sells are reported. The filing shows short call and put options on Class A Common Stock expiring unexercised for no value, with transaction code E indicating expiration of short derivative positions, rather than purchases or sales of the underlying shares.

Which Magnetar-related entities held the CoreWeave collar options?

The options were held indirectly by Magnetar Lake Credit Fund LLC, Magnetar Alpha Star Fund LLC, Magnetar Capital Master Fund, Ltd. and CW Opportunity LLC. Magnetar Financial LLC advises these funds, and related Magnetar entities and David J. Snyderman disclaim beneficial ownership except to the extent of any pecuniary interest.

Why did the CoreWeave collar options expire for no value on March 20, 2026?

According to the disclosure, both the call and put options in the collar expired unexercised and for no value because, on March 20, 2026, the closing price of CoreWeave Class A Common Stock was between the call strike price and the put strike price, leaving neither option in-the-money.

Does the Form 4 show any remaining CoreWeave derivative position for Magnetar after expiration?

The transactions are reported with zero derivatives remaining following expiration. Each short call and put option position on CoreWeave Class A Common Stock is listed with a total shares following transaction of 0.0000, indicating the collar structure no longer exists after March 20, 2026.