[Form 4] Magnite, Inc. Insider Trading Activity

Rhea-AI Filing Summary

On 11 July 2025, I-MAB (Nasdaq: IMAB) submitted a Form 6-K to notify investors that it has amended its 15 May 2025 prospectus covering the offer and sale of up to US$21 million in American Depositary Shares (ADSs). Each block of ten ADSs represents twenty-three ordinary shares with a par value of US$0.0001. The prospectus is part of the company’s shelf Registration Statement on Form F-3 (File No. 333-286954).
The filing attaches a Cayman Islands legal opinion from Harney Westwood & Riegels (Exhibit 5.1) together with the corresponding consent (Exhibit 23.1), confirming the validity of the ADSs and underlying ordinary shares. The 6-K states that the information and exhibits are incorporated by reference into the existing Form F-3 and several Form S-8 registration statements covering share-based compensation plans.
No operating or financial results are disclosed. The amendment maintains regulatory compliance and keeps the shelf registration effective, giving I-MAB flexibility to raise up to US$21 million when market conditions permit. While this improves liquidity options, it may also lead to equity dilution for current shareholders if the full amount is issued.

Positive

• Shelf registration remains effective, giving the company flexibility to raise up to US$21 million when opportune.
• Legal opinion and consent filed, reducing execution risk and demonstrating regulatory compliance.

Negative

• Potential equity dilution if the full US$21 million ADS offering is executed.
• Filing offers no operational or earnings information, leaving investors without insight into current performance or cash runway.

Insights

Securities Analyst

TL;DR – Neutral: keeps capital window open, modest dilution risk.

The 6-K merely updates legal documentation for an existing Form F-3. Because the maximum raise is capped at US$21 million, the potential dilution is limited relative to large biotech financings, yet meaningful for smaller-cap companies. The attached legal opinion removes an execution hurdle, signalling readiness to issue shares quickly if funding is needed. Absent earnings data, credit metrics or pipeline updates, the filing is administratively important but not fundamentally transformative. Overall impact on valuation is neutral unless or until the company actually sells ADSs.

Biotech Equity Specialist

TL;DR – Slight downside due to dilution overhang.

Investors must now factor in issuance of up to US$21 million in new ADSs—effectively expanding the free float and exerting downward pressure on share price until the offering clears. As no partnership cash or milestone revenue is disclosed, the raise appears intended for general corporate purposes, hinting at ongoing cash burn typical of clinical-stage biotech. Still, the modest size limits balance-sheet transformation. The filing is therefore modestly negative but not catastrophic.

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

X

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^*

Caine Paul

(Last) (First) (Middle)

C/O MAGNITE, INC.

1250 BROADWAY, 15TH FLOOR

(Street)

NEW YORK NY 10001

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
MAGNITE, INC. [ MGNI ]

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

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

3. Date of Earliest Transaction (Month/Day/Year)
07/10/2025

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

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

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

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
Common Stock	07/10/2025		S(1)		5,000	D	$23.53(2)	183,603	D

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

Explanation of Responses:

1. This sale was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 15, 2024.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.29 to $23.74, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

	/s/ Aaron Saltz, attorney-in-fact	07/11/2025
	** 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.

FAQ

How much capital can I-MAB (IMAB) raise under the amended prospectus?

The prospectus amendment covers the sale of up to US$21 million in ADSs.

What does each I-MAB ADS represent?

Each 10 ADSs represent 23 ordinary shares with a par value of US$0.0001 per share.

Which registration statement does the amended prospectus belong to?

It is part of I-MAB’s Form F-3 shelf registration (File No. 333-286954).

What legal documents were filed with the Form 6-K?

Exhibit 5.1 is the opinion of Harney Westwood & Riegels; Exhibit 23.1 is their consent, included within Exhibit 5.1.

Will the amended prospectus information affect other I-MAB filings?

Yes. The 6-K states the information is incorporated by reference into the existing Form F-3 and several Form S-8 filings.