SEC Form 4 reporting owner

Buonasera David

Buonasera David has filed 19 Form 4 transactions reported between January 1, 2026 and September 14, 2026, as CHIEF TECHNOLOGY OFFICER of MAGNITE, INC..

Name as filed: Buonasera David

Open-market buys, 24 mo

None

reported

Open-market sales, 24 mo

$841K

12 lines

Companies

with Form 4 filings

Latest transaction

Sep 14, 2026

transaction date

Roles and reported holdings

MGNIMAGNITE, INC.
Jan 1, 2026 – Sep 14, 2026
CHIEF TECHNOLOGY OFFICER
Held directly245,155 sh as of Sep 14, 2026 · Form 4
24 months: $841K sold

Transaction history

All 19 reported transactions, newest first. Every row links to the Form 4 on SEC EDGAR.

Date	Company	Type	Shares	Price	Value	Owned after	Filing
Sep 14, 2026	MGNICHIEF TECHNOLOGY OFFICER	Open-market saleCode S · direct	1,165	$24.00	$28K@ $24.00	245,155	Form 4
Sep 2, 2026	MGNICHIEF TECHNOLOGY OFFICER	Open-market saleCode S · direct	1,043	$25.00	$26K@ $25.00	246,320	Form 4
Sep 1, 2026	MGNICHIEF TECHNOLOGY OFFICER	Open-market saleCode S · direct	5,371	$23.42	$126K@ $23.42	247,363	Form 4
Aug 15, 2026	MGNICHIEF TECHNOLOGY OFFICER	Shares withheld for tax or exercise priceCode F · direct	8,102	$24.73	$200K@ $24.73	252,734	Form 4
Aug 6, 2026	MGNICHIEF TECHNOLOGY OFFICER	Open-market saleCode S · direct	871	$25.00	$22K@ $25.00	260,836	Form 4
Aug 6, 2026	MGNICHIEF TECHNOLOGY OFFICER	Open-market saleCode S · direct	2,602	$24.00	$62K@ $24.00	261,707	Form 4
Aug 6, 2026	MGNICHIEF TECHNOLOGY OFFICER	Open-market saleCode S · direct	4,176	$22.81	$95K@ $22.81	264,309	Form 4
Jul 7, 2026	MGNICHIEF TECHNOLOGY OFFICER	Open-market saleCode S · direct	1,224	$21.00	$26K@ $21.00	268,485	Form 4
Jul 1, 2026	MGNICHIEF TECHNOLOGY OFFICER	Open-market saleCode S · direct	9,376	$20.00	$188K@ $20.00	269,709	Form 4
Jun 17, 2026	MGNICHIEF TECHNOLOGY OFFICER	Open-market saleCode S · direct	1,409	$19.00	$27K@ $19.00	279,085	Form 4
Jun 16, 2026	MGNICHIEF TECHNOLOGY OFFICER	Open-market saleCode S · direct	11,233	$18.00	$202K@ $18.00	280,494	Form 4
Jun 15, 2026	MGNICHIEF TECHNOLOGY OFFICER	Open-market saleCode S · direct	1,057	$17.00	$18K@ $17.00	291,727	Form 4
Jun 1, 2026	MGNICHIEF TECHNOLOGY OFFICER	Open-market saleCode S · direct	1,409	$15.00	$21K@ $15.00	292,784	Form 4
May 15, 2026	MGNICHIEF TECHNOLOGY OFFICER	Shares withheld for tax or exercise priceCode F · direct	8,335	$12.82	$107K@ $12.82	294,193	Form 4
Feb 15, 2026	MGNICHIEF TECHNOLOGY OFFICER	Shares withheld for tax or exercise priceCode F · direct	17,137	$11.70	$201K@ $11.70	302,095	Form 4
Jan 9, 2026	MGNICHIEF TECHNOLOGY OFFICER	Shares withheld for tax or exercise priceCode F · direct	12,330	$16.17	$199K@ $16.17	319,232	Form 4
Jan 9, 2026	MGNICHIEF TECHNOLOGY OFFICER	Option exerciseCode M · direct	22,935	—	—	331,562	Form 4
Jan 1, 2026	MGNICHIEF TECHNOLOGY OFFICER	Grant or awardCode A · direct	25,801	—	—	25,801	Form 4
Jan 1, 2026	MGNICHIEF TECHNOLOGY OFFICER	Grant or awardCode A · direct	76,803	—	—	308,627	Form 4

How this page is built

Every row comes from a Form 4 filed with the SEC, which officers, directors and holders of more than 10% of a company’s stock must file within two business days of a trade. Transactions are grouped by the reporting owner’s name as filed (spacing, capitals and punctuation ignored); two different people filing under an identical name would appear together, and one person filing under two spellings appears on two pages.

Open-market totals count code P purchases and code S sales over the last 24 months. The same trade reported on more than one filing is counted once; when another owner (for example a fund and its general partner) reports the identical trade, they are listed beside it. Holdings are the shares owned after the latest purchase, sale, gift or tax-withholding line, shown separately for direct and indirect ownership; an indirect figure is one holding line, not a total across every trust or entity.

This page describes what was filed with the SEC; it is not investment advice or a recommendation to buy or sell any security.