Brian Gephart

CIK: 0001778484

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)7 (41.2%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)3 (17.6%)

Compensation grants

Other (G, F, J, C, D, …)7 (41.2%)

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

Companies & Roles (1)

MGNI

MAGNITE, INC.

Officer

Discretionary Trading P&L

Holdings

Transaction History (17 total)

MGNI
MAGNITE, INC.
Oct 1, 2026
Award(A)
Direct
64.7K shares-
MGNI
MAGNITE, INC.
Aug 15, 2026
Tax Payment(F)
Direct
3.8K shares at avg. $24.73$94K
MGNI
MAGNITE, INC.
Aug 10, 2026
Sale(S)
Direct
12.5K shares at avg. $24.68$308K
MGNI
MAGNITE, INC.
May 15, 2026
Tax Payment(F)
Direct
3.8K shares at avg. $12.82$49K
MGNI
MAGNITE, INC.
Feb 15, 2026
Tax Payment(F)
Direct
6.1K shares at avg. $11.70$72K
MGNI
MAGNITE, INC.
Jan 1, 2026
Award(A)
Direct
39.2K shares-
MGNI
MAGNITE, INC.
Nov 15, 2025
Tax Payment(F)
Direct
3.5K shares at avg. $14.15$50K
MGNI
MAGNITE, INC.
Sep 4, 2025
Sale(S)
Direct
27.7K shares at avg. $24.71$684K
MGNI
MAGNITE, INC.
Aug 18, 2025
Sale(S)
Direct
3K shares at avg. $23.85$71K
MGNI
MAGNITE, INC.
May 15, 2025
Tax Payment(F)
Direct
3K shares at avg. $15.88$48K
MGNI
MAGNITE, INC.
May 12, 2025
Sale(S)
Direct
6.3K shares at avg. $16.16$102K
MGNI
MAGNITE, INC.
Mar 3, 2025
Sale(S)
Direct
6.3K shares at avg. $16.00$100K
MGNI
MAGNITE, INC.
Feb 15, 2025
Tax Payment(F)
Direct
6.7K shares at avg. $20.00$135K
MGNI
MAGNITE, INC.
Jan 2, 2025
Award(A)
Direct
33.1K shares-
MGNI
MAGNITE, INC.
Nov 18, 2024
Sale(S)
Direct
2.2K shares at avg. $15.60$34K
MGNI
MAGNITE, INC.
Nov 15, 2024
Tax Payment(F)
Direct
2K shares at avg. $15.85$32K
MGNI
MAGNITE, INC.
Nov 11, 2024
Sale(S)
Direct
2.2K shares at avg. $15.00$32K

		Type	Shares	Price		Ownership
Oct 1, 2026	MGNI MAGNITE, INC.	Award(A)	64,682	-	$0	Direct
Aug 15, 2026	MGNI MAGNITE, INC.	Tax Payment(F)	3,789	$24.73	$93,702	Direct
Aug 10, 2026	MGNI MAGNITE, INC.	Sale(S)	12,479	$24.68	$307,982	Direct
May 15, 2026	MGNI MAGNITE, INC.	Tax Payment(F)	3,789	$12.82	$48,575	Direct
Feb 15, 2026	MGNI MAGNITE, INC.	Tax Payment(F)	6,149	$11.70	$71,943	Direct
Jan 1, 2026	MGNI MAGNITE, INC.	Award(A)	39,185	-	$0	Direct
Nov 15, 2025	MGNI MAGNITE, INC.	Tax Payment(F)	3,549	$14.15	$50,218	Direct
Sep 4, 2025	MGNI MAGNITE, INC.	Sale(S)	27,671	$24.71	$683,750	Direct
Aug 18, 2025	MGNI MAGNITE, INC.	Sale(S)	2,961	$23.85	$70,620	Direct
May 15, 2025	MGNI MAGNITE, INC.	Tax Payment(F)	3,045	$15.88	$48,355	Direct
May 12, 2025	MGNI MAGNITE, INC.	Sale(S)	6,334	$16.16	$102,357	Direct
Mar 3, 2025	MGNI MAGNITE, INC.	Sale(S)	6,250	$16.00	$100,000	Direct
Feb 15, 2025	MGNI MAGNITE, INC.	Tax Payment(F)	6,749	$20.00	$134,980	Direct
Jan 2, 2025	MGNI MAGNITE, INC.	Award(A)	33,113	-	$0	Direct
Nov 18, 2024	MGNI MAGNITE, INC.	Sale(S)	2,156	$15.60	$33,634	Direct
Nov 15, 2024	MGNI MAGNITE, INC.	Tax Payment(F)	2,031	$15.85	$32,191	Direct
Nov 11, 2024	MGNI MAGNITE, INC.	Sale(S)	2,156	$15.00	$32,340	Direct

1-17 of 17 transactions

About Gephart Brian

Gephart Brian (SEC CIK 0001778484) files insider reports with the SEC as CHIEF FINANCIAL OFFICER of MAGNITE, INC. (MGNI).

Signal8 holds 16 ownership filings by Gephart Brian, all Form 4s, filed between Nov 13, 2024 and Oct 2, 2026. Those filings report 17 transactions, from Nov 11, 2024 to Oct 1, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Gephart Brian's filings is in NEW YORK, NY.

Recent filings by Gephart Brian

Oct 1, 2026: Grant or award of MGNI shares (Form 4, code A).
Aug 15, 2026: Tax withholding of MGNI shares (Form 4, code F).
Aug 10, 2026: Open-market sale of MGNI shares (Form 4, code S).
May 15, 2026: Tax withholding of MGNI shares (Form 4, code F).
Feb 15, 2026: Tax withholding of MGNI shares (Form 4, code F).

Other insiders filing for MAGNITE, INC. (MGNI)

Caine Paul, Director
Sullivan Haas, CHIEF ACCOUNTING OFFICER
Knopper Douglas S, Director
Buonasera David, CHIEF TECHNOLOGY OFFICER
Spillane Robert F, Director
Evans Katie Seitz

How to read Form 4 transaction codes