The cluster does not signal informed selling — the dollar value is negligible and sellers are non-C-suite. Monitor next earnings for any guidance change, but this filing alone does not warrant a trading action.
Price Chart
Executive Summary
Multiple insiders at Magnite, including the Chief Accounting Officer and two directors, sold a total of $671K in shares on August 10, 2026, near the stock's current price of $24.68. This cluster of open-market sales, while modest relative to the $3.5B market cap (0.02%), comes amid strong analyst bullishness (86% buy), but also follows recent insider selling patterns ($2.7M over the last 30 days). The selling is concentrated at the director and CAO level, not the CEO, and the CEO's concurrent tax-withholding transaction is non-informative. The cluster does not warrant a bearish signal due to the small dollar amount and the non-C-suite composition; however, the cross-filing actuaries show a cluster-amplifier pattern, suggesting this filing type has historically predicted positive returns in this segment, which defaults the sentiment to neutral with a low impact.
Key Financial Metrics
Key Facts
- Insider cluster: $671K in open-market sales over 3 days (Aug 8-15, 2026)
- Sellers: Director Paul Caine ($122K), Director Rachel Lam ($242K), CAO Brian Gephart ($308K)
- CEO Michael Barrett reported only a non-cash tax withholding ($257K), no open-market sale
- Sales represent ~0.02% of $3.5B market cap — well below the 0.1% materiality threshold
- Prior 30 days: $2.7M in insider sells; 86% of analysts rate MGNI Buy/Strong Buy
- Cross-filing actuaries flag an amplifier for this cluster type, but raw dollar amount is trivial
Financial Impact
$671K in aggregate insider sales; 0.02% of market cap — immaterial
Risk Factors
- Insider selling could accelerate if Q3 results disappoint
- Recent insider selling patterns ($2.7M/30d) may indicate broader distribution
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-1787119861591 |
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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