Magnite, Inc. Insider Trading

MGNI

Last 12 months

Insiders sold $26.9M and bought nothing on the open market.

96% of the selling was scheduled in advance under 10b5-1 plans. Chief Accounting Officer Brian Gephart sold 308K on Aug 10, 11% of their stake, outside a plan. The last open-market buy by an executive or director was in May 2022.

Net open-market

−$26.9M

0 buys · 41 sales

Under a 10b5-1 plan

96%

of the value sold

Insiders who bought / sold

0 / 13

executives and directors

Last open-market buy

May 2022

May 11, 2022

Get an email when MGNI's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Oct 12	Paul Caine Director	Sold10b5-1 plan	12,500	$25.29	316K	9.1%	Form 4
Sep 17	Paul Caine Director	Sold10b5-1 plan	7,500	$26.50	199K	5.2%	Form 4
Sep 17	Douglas S Knopper Director	Sold10b5-1 plan	37,337	$26.28	981K	42%	Form 4
Sep 14	David Buonasera Chief Technology Officer	Sold10b5-1 plan	1,165	$24.00	28K	0.5%	Form 4
Sep 14	Robert F Spillane Director	SoldNo plan	10,363	$23.76	246K	15%	Form 4
Sep 11	Katie Seitz Evans See Remarks	Sold10b5-1 plan	13,997	$24.00	336K	3.1%	Form 4
Sep 10	Aaron Saltz Chief Legal Officer	Sold10b5-1 plan	40,000	$23.41	936K	15%	Form 4
Sep 10	Paul Caine Director	Sold10b5-1 plan	5,000	$23.53	118K	3.3%	Form 4
Sep 8 – 9	Katie Seitz Evans See Remarks	Sold10b5-1 plan 2 parts	43,385	$23.59 average	$1.02M	8.7%	Form 4
Sep 1 – 2	David Buonasera Chief Technology Officer	Sold10b5-1 plan 2 parts	6,414	$23.68 average	152K	2.5%	Form 4
Aug 26 – 28	Sarah Patricia Harden Director	Sold10b5-1 plan 2 parts	48,986	$23.57 average	$1.15M	30%	Form 4
Aug 17 – 18	Sean Patrick Buckley See Remarks	Sold10b5-1 plan 2 parts	11,030	$24.48 average	270K	3.6%	Form 4
Aug 14	Paul Caine Director	Sold10b5-1 plan	7,500	$25.00	188K	4.8%	Form 4
Aug 10	Brian Gephart Chief Accounting Officer	SoldNo plan	12,479	$24.68	308K	11%	Form 4
Aug 10	Rachel Lam Director	SoldNo plan	10,000	$24.16	242K	4.2%	Form 4
Aug 10	Paul Caine Director	Sold10b5-1 plan	5,000	$24.35	122K	3.1%	Form 4
Aug 6	David Buonasera Chief Technology Officer	Sold10b5-1 plan 3 parts	7,649	$23.46 average	179K	2.8%	Form 4
Aug 6	Sean Patrick Buckley See Remarks	Sold10b5-1 plan 2 parts	67,179	$24.49 average	$1.65M	18%	Form 4
Aug 6	Katie Seitz Evans See Remarks	Sold10b5-1 plan	20,000	$24.00	480K	3.9%	Form 4
Aug 6	Douglas S Knopper Director	Sold10b5-1 plan	37,337	$22.72	848K	30%	Form 4
Aug 6	Michael G. Barrett CEO	Sold10b5-1 plan	293,968	$22.72	$6.68M	42%	Form 4
Jul 15	Michael G. Barrett CEO	Sold10b5-1 plan	38,596	$20.35	785K	8.7%	Form 4
Jul 10	Paul Caine Director	Sold10b5-1 plan	5,000	$20.64	103K	3.0%	Form 4
Jul 7	David Buonasera Chief Technology Officer	Sold10b5-1 plan	1,224	$21.00	26K	0.5%	Form 4
Jul 7	Sean Patrick Buckley See Remarks	Sold10b5-1 plan	19,233	$21.03	404K	5.1%	Form 4
Jul 1	David Buonasera Chief Technology Officer	Sold10b5-1 plan	9,376	$20.00	188K	3.4%	Form 4
Jun 29	Michael G. Barrett CEO	Sold10b5-1 plan	75,000	$19.50	$1.46M	16%	Form 4
Jun 17	Sean Patrick Buckley See Remarks	Sold10b5-1 plan	19,233	$19.00	365K	4.9%	Form 4
Jun 15 – 17	David Buonasera Chief Technology Officer	Sold10b5-1 plan 3 parts	13,699	$18.03 average	247K	4.7%	Form 4
Jun 16	Douglas S Knopper Director	Sold10b5-1 plan	37,337	$18.10	676K	23%	Form 4
Jun 15 – 16	Michael G. Barrett CEO	Sold10b5-1 plan 2 parts	278,596	$16.92 average	$4.71M	41%	Form 4
Jun 10	Douglas S Knopper Director	Sold10b5-1 plan	10,766	$15.73	169K	6.2%	Form 4
Jun 10	David T. Pearson Director	Sold10b5-1 plan	10,766	$15.65	168K	12%	Form 4
Jun 1	David Buonasera Chief Technology Officer	Sold10b5-1 plan	1,409	$15.00	21K	0.5%	Form 4
May 19	Robert F Spillane Director	SoldNo plan	10,000	$13.33	133K	19%	Form 4
Feb 18	Adam Lee Soroca Chief Product Officer	Sold10b5-1 plan	21,529	$12.00	258K	5.3%	Form 4
Dec 17, 2025	Adam Lee Soroca Chief Product Officer	Sold10b5-1 plan	16,656	$17.00	283K	4.9%	Form 4
Nov 24, 2025	Sean Patrick Buckley President, Revenue	Sold10b5-1 plan	2,213	$14.50	32K	0.8%	Form 4
Nov 21, 2025	Robert F Spillane Director	SoldNo plan	12,500	$14.22	178K	19%	Form 4
Nov 18, 2025	Sean Patrick Buckley President, Revenue	Sold10b5-1 plan	4,426	$13.36	59K	1.6%	Form 4

Oct 1210b5-1 plan
Paul Caine
Director · sold 12,500 at $25.29
316K
9.1% of stake
Sep 1710b5-1 plan
Paul Caine
Director · sold 7,500 at $26.50
199K
5.2% of stake
Sep 1710b5-1 plan
Douglas S Knopper
Director · sold 37,337 at $26.28
981K
42% of stake
Sep 1410b5-1 plan
David Buonasera
Chief Technology Officer · sold 1,165 at $24.00
28K
0.5% of stake
Sep 14No plan
Robert F Spillane
Director · sold 10,363 at $23.76
246K
15% of stake
Sep 1110b5-1 plan
Katie Seitz Evans
See Remarks · sold 13,997 at $24.00
336K
3.1% of stake
Sep 1010b5-1 plan
Aaron Saltz
Chief Legal Officer · sold 40,000 at $23.41
936K
15% of stake
Sep 1010b5-1 plan
Paul Caine
Director · sold 5,000 at $23.53
118K
3.3% of stake
Sep 8 – 910b5-1 plan
Katie Seitz Evans
See Remarks · sold 43,385 at avg $23.59
$1.02M
8.7% of stake
Sep 1 – 210b5-1 plan
David Buonasera
Chief Technology Officer · sold 6,414 at avg $23.68
152K
2.5% of stake
Aug 26 – 2810b5-1 plan
Sarah Patricia Harden
Director · sold 48,986 at avg $23.57
$1.15M
30% of stake
Aug 17 – 1810b5-1 plan
Sean Patrick Buckley
See Remarks · sold 11,030 at avg $24.48
270K
3.6% of stake
Aug 1410b5-1 plan
Paul Caine
Director · sold 7,500 at $25.00
188K
4.8% of stake
Aug 10No plan
Brian Gephart
Chief Accounting Officer · sold 12,479 at $24.68
308K
11% of stake
Aug 10No plan
Rachel Lam
Director · sold 10,000 at $24.16
242K
4.2% of stake
Aug 1010b5-1 plan
Paul Caine
Director · sold 5,000 at $24.35
122K
3.1% of stake
Aug 610b5-1 plan
David Buonasera
Chief Technology Officer · sold 7,649 at avg $23.46
179K
2.8% of stake
Aug 610b5-1 plan
Sean Patrick Buckley
See Remarks · sold 67,179 at avg $24.49
$1.65M
18% of stake
Aug 610b5-1 plan
Katie Seitz Evans
See Remarks · sold 20,000 at $24.00
480K
3.9% of stake
Aug 610b5-1 plan
Douglas S Knopper
Director · sold 37,337 at $22.72
848K
30% of stake
Aug 610b5-1 plan
Michael G. Barrett
CEO · sold 293,968 at $22.72
$6.68M
42% of stake
Jul 1510b5-1 plan
Michael G. Barrett
CEO · sold 38,596 at $20.35
785K
8.7% of stake
Jul 1010b5-1 plan
Paul Caine
Director · sold 5,000 at $20.64
103K
3.0% of stake
Jul 710b5-1 plan
David Buonasera
Chief Technology Officer · sold 1,224 at $21.00
26K
0.5% of stake
Jul 710b5-1 plan
Sean Patrick Buckley
See Remarks · sold 19,233 at $21.03
404K
5.1% of stake
Jul 110b5-1 plan
David Buonasera
Chief Technology Officer · sold 9,376 at $20.00
188K
3.4% of stake
Jun 2910b5-1 plan
Michael G. Barrett
CEO · sold 75,000 at $19.50
$1.46M
16% of stake
Jun 1710b5-1 plan
Sean Patrick Buckley
See Remarks · sold 19,233 at $19.00
365K
4.9% of stake
Jun 15 – 1710b5-1 plan
David Buonasera
Chief Technology Officer · sold 13,699 at avg $18.03
247K
4.7% of stake
Jun 1610b5-1 plan
Douglas S Knopper
Director · sold 37,337 at $18.10
676K
23% of stake
Jun 15 – 1610b5-1 plan
Michael G. Barrett
CEO · sold 278,596 at avg $16.92
$4.71M
41% of stake
Jun 1010b5-1 plan
Douglas S Knopper
Director · sold 10,766 at $15.73
169K
6.2% of stake
Jun 1010b5-1 plan
David T. Pearson
Director · sold 10,766 at $15.65
168K
12% of stake
Jun 110b5-1 plan
David Buonasera
Chief Technology Officer · sold 1,409 at $15.00
21K
0.5% of stake
May 19No plan
Robert F Spillane
Director · sold 10,000 at $13.33
133K
19% of stake
Feb 1810b5-1 plan
Adam Lee Soroca
Chief Product Officer · sold 21,529 at $12.00
258K
5.3% of stake
Dec 17, 202510b5-1 plan
Adam Lee Soroca
Chief Product Officer · sold 16,656 at $17.00
283K
4.9% of stake
Nov 24, 202510b5-1 plan
Sean Patrick Buckley
President, Revenue · sold 2,213 at $14.50
32K
0.8% of stake
Nov 21, 2025No plan
Robert F Spillane
Director · sold 12,500 at $14.22
178K
19% of stake
Nov 18, 202510b5-1 plan
Sean Patrick Buckley
President, Revenue · sold 4,426 at $13.36
59K
1.6% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch MGNI, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Held by ETFs

MGNI is in 63 US ETFs. The largest of them, with MGNI's weight in each:

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Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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