Latest filingSep 03, 2026Most recent Form 4
MGNI
MAGNITE, INC.
NasdaqTechnologyServices-Computer Programming, Data Processing, Etc.
Insider activity for last month from 08/04 to 09/04. Counts use processed Form 4 rows. Purchase and sale metrics use codes P and S; totals remain unknown when any matching value is missing. Rows without a usable transaction date cannot be assigned to a rolling period and are excluded.
Total buying$00 buys
Total selling$176M7 sells
Net open-market-$176M9 insiders
Open-market mix
Buy vs sell distribution by transaction countInsider activity report
Monthly open-market purchase and sale counts Buys Sells
Transaction codes
By Form 4 transaction code in selected period14transactions
- F · Tax withholding · dominant7 · 50%
- S · Open-market sells7 · 50%
Activity by reported role
A joint filing can contribute to multiple roles14transactions
- SR · dominant4 · 29%
- CTO3 · 21%
- Director3 · 21%
- CAO1 · 7%
- Chief executive officer1 · 7%
- Chief financial officer1 · 7%
- CLO1 · 7%
Distinct insiders active
Reporting-owner CIKs by month · peak Aug 2026 (9)Aug 2026Sep 2026
Reported Holdings After
Separated by insider, security, and ownership typeBuckley Sean PatrickCommon Stock · Direct
293,060Aug 18, 2026
Buonasera DavidCommon Stock · Direct
246,320Sep 02, 2026
Harden Sarah PatriciaCommon Stock · Direct
114,751Aug 28, 2026
Caine PaulCommon Stock · Direct
149,901Aug 14, 2026
Day DavidCommon Stock · Direct
452,861Aug 15, 2026
Barrett Michael G.Common Stock · Direct
392,670Aug 15, 2026
Gephart BrianCommon Stock · Direct
102,328Aug 15, 2026
Saltz AaronCommon Stock · Direct
264,389Aug 15, 2026
These are reported post-transaction holdings, not company-wide ownership percentages. Securities, indirect vehicles, and amendments are kept separate.
Filing activity heatmap
Each cell is one day · intensity = transactions · buys green, sells redAug 04 → Sep 04
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Top insiders
By absolute net value across the selected period- BP-$270.0k
- CP-$187.5k
- BD-$151.9k
Filing detail checks
Secondary metrics for the selected periodFiling-only signals
Deterministic matches in the selected period
MGNI transaction history
Filters apply within this company and selected period by default| Ticker | Insider | Role | Type | Shares | Value | Code | Signals | 90d return | Filed | Trans date |
|---|---|---|---|---|---|---|---|---|---|---|
| MGNI | Buonasera David | CTO | sale10b5-1 | 1.04k | -$2.60M | S | — | 0.0% | 09/03 | 09/02 |
| MGNI | Buonasera David | CTO | sale10b5-1 | 5.37k | -$12.5M | S | — | 0.0% | 09/03 | 09/01 |
| MGNI | Caine Paul | DIR | sale10b5-1 | 7.50k | -$18.7M | S | −6.7% | 08/18 | 08/14 | |
| MGNI | Buckley Sean Patrick | SR | sale10b5-1 | 2.75k | -$6.89M | S | −6.7% | 08/18 | 08/18 | |
| MGNI | Buckley Sean Patrick | SR | sale10b5-1 | 8.27k | -$20.1M | S | −6.7% | 08/18 | 08/17 |
MAGNITE, INC. Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at MAGNITE, INC.?
Buonasera David, Harden Sarah Patricia, Evans Katie Seitz, Saltz Aaron, Gephart Brian, BARRETT MICHAEL G., Day David, Caine Paul, Buckley Sean Patrick.
When was the latest reported open-market purchase?
No code-P purchase is available for this period.
When was the latest reported open-market sale?
Buonasera David reported a sale on Sep 02, 2026 valued at $2.60M. Read the SEC filing.
What is the recent purchase and sale balance?
Net open-market selling in the selected period was $1,763,991.33. Sales can occur for many non-investment reasons.
Where can I see the original SEC filing?
Every transaction row and latest-activity fact links to its original SEC filing.
What do these Form 4 transaction codes mean?
P and S generally describe open-market or private purchases and sales. A, D, F, M, X, G, J, and V describe awards, issuer dispositions, tax withholding, exercises, gifts, other transactions, and voluntary early reports; review each filing and its footnotes for context.