Gephart Brian sold $308K of MGNI

Gephart Brian (CHIEF ACCOUNTING OFFICER) sold 12,479 shares of MAGNITE, INC. (MGNI) at $24.68 ($0.31M total) on 2026-08-10.

Original reporting
SEC EDGAR · Gephart Brian
Published Aug 12, 2026, 8:54 PM UTC
Analysis
AlphAI AI DeskAI-generated
Added to AlphAI Aug 12, 2026, 11:01 PM UTC. Informational, not investment advice.
How this was made
AlphAI summarizes source reporting and applies a structured AI analysis for relevance, timing, sentiment and ticker impact. Always verify material claims with the original publisher.
AlphAI market briefInsider activity
Primary signal
$MGNI
Neutral
low confidence
Mentioned
$MGNI
Relevance
4/10
AlphAI data visualization · based on SEC EDGAR
Decision brief

The 30-second read

$MGNINeutralLow
01

Why it matters

The newest disclosed fact is the specific open-market sale size, price, and post-transaction holdings by the chief accounting officer.

02

Market read

Traders may note insider selling activity, but there is no accompanying operational or financial update in the text.

03

What to watch

The filing does not state a 10b5-1 plan, but insider sales without additional context still have weak signal-to-noise for trading decisions.

Relevance 4/10Novelty 3/10Timing: filed 2026-08-12, sale executed 2026-08-10

Background

The article is an SEC Form 4 insider transaction disclosure for Magnite, Inc.

Company-level read

Ticker impact

$MGNINeutralLow confidence
Context

Magnite Form 4 shows CFO Gephart Brian sold 12,479 shares on 2026-08-10 at $24.6800, totaling $307,981.72.

Expected impact

Likely minimal near-term impact; any effect would be sentiment-only and typically fades.

Evidence & confidence

Form 4 insider sales are common and, absent accompanying guidance, litigation, or operational updates, usually have limited predictive value for price.

Market effects

No clear sector read-through from a single insider sale.

None indicated.

None indicated.

Counterpoint

The sale could be for diversification or personal liquidity needs and may not reflect a bearish view on Magnite’s prospects.

Key entities

  • MAGNITE, INC.

    Subject of the Form 4 insider transaction disclosure.

  • Gephart Brian

    Chief Accounting Officer who sold shares.

Full insider trading history

This story covers one filing. See everything behind it: every insider buy and sell on record, 10b5-1 plans, late filings, and which officers and directors are trading.

Related articles

$MGNIMed

Magnite net income gains 70% to $34m as political ads near 3x forecast

Magnite reported Q3 2026 net income of $34.0M, up 70% YoY, with revenue rising 14% to $204.2M. CTV (streaming TV) grew 39% and accounted for 53% of total contribution. Political ads contributed significantly, but growth is expected to slow post-election. Adjusted EBITDA rose 46% to $83.4M, with margins improving to 42%.

$MGNIHighAI 8/10

Magnite (MGNI) Q3 2026 Earnings Call Transcript

Magnite (MGNI) reported strong Q3 2026 results, exceeding expectations with $201M in total contribution ex-TAC, 39% CTV growth, and 5% DV+ growth. Political ad spend surpassed forecasts at $12M, with full-year expectations raised to $40M. Adjusted EBITDA margin reached 42%. The company expects continued momentum, driven by CTV growth, partnerships, and political ad spend, with long-term CTV growth projected at 25% annually.

$APPHighAI 9/10

AppLovin Soars 30% on Record Quarter and Strong Outlook; Magnite Surges 17%, Trade Desk Falls 2%

AppLovin (APP) surged 30% after reporting Q3 2026 revenue of $2.18B, beating estimates, and raising its share repurchase authorization to $3.6B. The company guided Q4 revenue above consensus, citing strong growth in its ad business. Magnite (MGNI) rose 17% on strong results, while The Trade Desk (TTD) fell 2% on weak Q2 performance. Unity (U) gained 10% after reporting its first GAAP profitable quarter.