Transaction · 0001865116-26-000009

Buckley Sean Patrick

Buckley Sean Patrick, SR, reported a transaction classified as withholding at MAGNITE, INC. involving 11715.000000 shares for an estimated $289711.95. Reported holdings after the transaction were 304090.000000 shares. The stored filing text includes a detected 10b5-1 reference.

withholdingSEC transaction code FSR
MGNIMAGNITE, INC.
Filing timeAug 18
Trade dateAug 15, 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 -18.8%1w ago +0.8%1d ago +0.8%
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
withholding
Code F
Identifier
0001865116-26-000009
Common Stock
Transaction date
Aug 15, 2026
Filed Aug 18, 2026, 08:14 PM · 3d delay
Shares
11.7k sh
$2.47k per share
Estimated value
-$28.9M
Computed from shares × price
Holdings after
304k sh
Direct

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $10.0MLarge $100M
Direct Ownership 10b5-1 Detected
-26score
Filing-only score

-26

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

Low filing signal

This filing has a meaningfully negative filing-only score. It is likely less useful as a positive insider-activity signal.

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

0 other filings

Same reporting owner
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