Douglas S. Knopper

CIK: 0001350876

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)4 (66.7%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)2 (33.3%)

Compensation grants

Other (G, F, J, C, D, …)0 (0.0%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

MGNI

MAGNITE, INC.

Director

Discretionary Trading P&L

Holdings

Transaction History (6 total)

MGNI
MAGNITE, INC.
Sep 17, 2026
Sale(S)
Direct
37.3K shares at avg. $26.28$981K
MGNI
MAGNITE, INC.
Aug 6, 2026
Sale(S)
Direct
37.3K shares at avg. $22.72$848K
MGNI
MAGNITE, INC.
Jun 16, 2026
Sale(S)
Direct
37.3K shares at avg. $18.10$676K
MGNI
MAGNITE, INC.
Jun 10, 2026
Sale(S)
Direct
10.8K shares at avg. $15.73$169K
MGNI
MAGNITE, INC.
Jun 8, 2026
Award(A)
Direct
13.8K shares-
MGNI
MAGNITE, INC.
Jun 5, 2025
Award(A)
Direct
10.8K shares-

		Type	Shares	Price		Ownership
Sep 17, 2026	MGNI MAGNITE, INC.	Sale(S)	37,337	$26.28	$981,216	Direct
Aug 6, 2026	MGNI MAGNITE, INC.	Sale(S)	37,337	$22.72	$848,297	Direct
Jun 16, 2026	MGNI MAGNITE, INC.	Sale(S)	37,337	$18.10	$675,800	Direct
Jun 10, 2026	MGNI MAGNITE, INC.	Sale(S)	10,766	$15.73	$169,349	Direct
Jun 8, 2026	MGNI MAGNITE, INC.	Award(A)	13,798	-	$0	Direct
Jun 5, 2025	MGNI MAGNITE, INC.	Award(A)	10,766	-	-	Direct

1-6 of 6 transactions

About Knopper Douglas S

Knopper Douglas S (SEC CIK 0001350876) files insider reports with the SEC as Director of MAGNITE, INC. (MGNI).

Signal8 holds 5 ownership filings by Knopper Douglas S, all Form 4s, filed between Jun 6, 2025 and Sep 18, 2026. Those filings report 6 transactions, from Jun 5, 2025 to Sep 17, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Knopper Douglas S's filings is in NEW YORK, NY.

Recent filings by Knopper Douglas S

Sep 17, 2026: Open-market sale of MGNI shares (Form 4, code S).
Aug 6, 2026: Open-market sale of MGNI shares (Form 4, code S).
Jun 16, 2026: Open-market sale of MGNI shares (Form 4, code S).
Jun 10, 2026: Open-market sale of MGNI shares (Form 4, code S).
Jun 8, 2026: Grant or award of MGNI shares (Form 4, code A).

Other insiders filing for MAGNITE, INC. (MGNI)

Caine Paul, Director
Sullivan Haas, CHIEF ACCOUNTING OFFICER
Gephart Brian, CHIEF FINANCIAL OFFICER
Buonasera David, CHIEF TECHNOLOGY OFFICER
Spillane Robert F, Director
Evans Katie Seitz

How to read Form 4 transaction codes