The CEO's large sale is partially explained by a derivative exercise, but the cluster of 5 insiders selling on the same day is a bearish signal. Monitor for any upcoming earnings or material news that could explain the timing. The 63% historical win rate on MGNI calls suggests the market may not fully price this in immediately — consider a short-term bearish bias but size modestly given the modest proportionality.
Price Chart
Executive Summary
A cluster of insider selling at Magnite, led by CEO Michael Barrett selling $6.68M worth of shares at $22.72, all on the same day (Aug 6). The total open-market sales of $9.27M represent ~0.26% of the $3.5B market cap, which is a modest but notable amount. The CEO's sale is tied to a derivative exercise (293,968 shares at $5.80), suggesting a cashless exercise-and-sell pattern rather than a purely opportunistic dump, but the concentration of C-suite and director sales on a single day warrants attention. The historical calibration shows past bearish calls on MGNI had mixed outcomes (T+20 win rate 63% overall but recent short calls were split), and the score-6 calibration for this segment shows a 56% observed up-move probability, suggesting caution against over-scoring bearish. The cross-filing actuarial verdicts are all amplifiers, but no specific cross-filing context beyond the cluster itself was provided, so no override applies. Sentiment is bearish due to the CEO-led cluster sale, but impact is capped at 5 (modest) given the proportionality check and the derivative-exercise context.
Key Financial Metrics
Key Facts
- CEO Michael G. Barrett sold 293,968 shares for $6.68M on Aug 6, tied to exercising options at $5.80
- Total open-market insider sales of $9.27M across 5 insiders on a single day
- Sales represent ~0.26% of MGNI's $3.5B market cap
- All sales occurred on Aug 6, suggesting coordinated timing (likely post-blackout-window opening)
- CTO David Buonasera sold a small amount ($179K total), Director Knopper sold $848K, and two other executives sold $1.68M combined
Financial Impact
Insider selling of $9.27M (0.26% of market cap) concentrated on one day
Risk Factors
- CEO sale was part of a cashless option exercise — may not reflect bearish conviction
- Insider sales at this level are routine for a $3.5B company and may be pre-planned (10b5-1 plans not disclosed)
- MGNI has 86% analyst bullish rating — strong fundamental momentum could offset insider selling signal
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-MGNI-1786169019366 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Sep 11, 2026 22d ago | Insider Cluster | $23.77 $23.84 | ▲ +0.29% | ▲ +0.74% | $25.44 (+7.03%) |
Sep 10, 2026 22d ago | Press Release | $23.55 $23.77 | ▲ +0.93% | ▲ +0.08% | $25.44 (+8.03%) |
Sep 10, 2026 23d ago | Insider Cluster | $23.55 $23.77 | ▲ +0.93% | ▲ +0.08% | $25.44 (+8.03%) |
Sep 3, 2026 4w ago | Insider Cluster | $24.63 $24.14 | ▼ −1.99% | ▼ −1.60% | $25.44 (+3.29%) |
Aug 12, 2026 7w ago | Insider Cluster | $24.34 $24.58 | ▲ +0.99% | ▲ +0.29% | $25.44 (+4.52%) |
Aug 12, 2026 7w ago | Insider Cluster | $24.34 $24.58 | ▼ −0.99% | ▼ −0.29% | $25.44 (−4.52%) |
Aug 12, 2026 7w ago | Insider Cluster | $24.34 $24.58 | ▼ −0.99% | ▼ −0.29% | $25.44 (−4.52%) |
Aug 10, 2026 7w ago | 144 | $24.30 $24.34 | ▲ +0.16% | ▼ −0.09% | $25.44 (+4.69%) |
Aug 7, 2026 8w ago | Insider Cluster | $24.21 $24.30 | ▼ −0.37% | ▼ −0.69% | $25.44 (−5.08%) |
Aug 7, 2026 8w ago | Insider Cluster | $24.21 $24.30 | ▲ +0.37% | ▲ +0.69% | $25.44 (+5.08%) |
US Market Status
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