Transaction · 0001865116-26-000009

Buckley Sean Patrick

Buckley Sean Patrick, SR, reported an open-market or private sale at MAGNITE, INC. involving 2759.000000 shares for an estimated $68975.00. Reported holdings after the transaction were 293060.000000 shares. The stored filing text includes a detected 10b5-1 reference.

Open-market sellSEC transaction code SSR
MGNIMAGNITE, INC.
Filing timeAug 18
Trade dateAug 18, 2026
Filing · SECView on SEC
InsiderProfile

Price performance since filing

Close on the filing date, the pre-filing context, and the forward return at standard windows
Price at filing
$24.53
Pre-filing
1mo ago -22.5%1w ago -0.9%1d ago -1.4%
Returns since
7d -4.0%30d -6.7%90d -6.7%180d -6.7%1y -6.7%

MGNI price since this filing

30 days of pre-filing context and vertical markers at the filing date plus 7d / 30d / 90d / 180d / 1y afterwards
MGNI since 2026-08-18Filed 17 days ago · 30 days of pre-filing context shaded
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Filing datePost-filing windows (7d, 30d, 90d, 180d, 1y)30 days of pre-filing context

Transaction facts

Stored Form 4 columns with their raw values

Non-derivative
Type
Sell
Code S
Identifier
0001865116-26-000009
Common Stock
Transaction date
Aug 18, 2026
Filed Aug 18, 2026, 08:14 PM · 0d delay
Shares
2.75k sh
$2.50k per share
Estimated value
-$6.89M
Computed from shares × price
Holdings after
293k sh
Direct

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $10.0MLarge $100M
Cluster Selling Direct Ownership Repeat Seller 10b5-1 Detected
0score
Filing-only score

0

Compact filing score computed from stored Form 4 facts. Version v1.

Neutral filing signal

This filing is broadly neutral on the filing-only scale. The Form 4 facts do not strongly tilt positive or negative.

Reported relationships & other filings

Form 4 relationship flags and nearby filing context

Reported roles

See Remarks

Officer YesDirector No10% NoOther No
Footnotes & amended
  1. F1

    Represents the non-discretionary forfeiture of shares on behalf of the Reporting Person pursuant to an arrangement mandated by the Issuer to cover the tax withholding obligations associated with the v…

  2. F2

    The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 10, 2025.

  3. F3

    The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.05 to $24.55, inclusive. The Reporting Person undertakes to provi…

Original filing · 0001865116-26-000009
Related transactions

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Same reporting owner
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