Form 144 signals director intent to continue selling into strength, following $4.7M in sales two weeks prior. Although small relative to $2.9B market cap, the pattern of two near-term tranches suggests a potential belief that the stock is fully valued. Monitor for actual Form 4 filings to confirm execution, and watch for further insider sale filings in the coming weeks.
Price Chart
Executive Summary
Director Michael G. Barrett filed a Form 144 notice to sell 75,000 shares of Magnite common stock, valued at approximately $1.46 million, following a stock option exercise. This intent-to-sell comes on the heels of his recent sales of 278,596 shares for ~$4.7M on June 15-16, adding to a 30-day insider sale total of $4.0M. At a market cap of $2.9B, the proposed sale is small (0.05% of shares outstanding) but the pattern of recent director-level sales warrants attention.
Key Facts
- Director Michael G. Barrett filed Form 144 to sell 75,000 shares
- Proposed sale value estimated at ~$1.46M based on recent price
- Shares were acquired via stock option exercise on June 29, 2026
- Barrett sold 100,000 shares on June 16 and 178,596 shares on June 15, totaling ~$4.7M in the prior two weeks
- 30-day insider sale activity totals $4.0M across 6 transactions
- Institutional backdrop shows 10 funds trimming or nearing exit vs 10 adding/doubling, with top holders BlackRock ($138M) and Wellington ($109M)
Financial Impact
Proposed sale of 75,000 shares worth ~$1.46M; combined with recent June 15-16 sales of 278,596 shares for ~$4.7M, total disposition intent in June is ~$6.2M
Risk Factors
- Form 144 is an intent to sell; the actual sale may not occur or may be smaller than indicated
- Option-exercise-and-sell is common for director compensation and may not reflect negative conviction
- No other insider selling cluster has emerged beside Barrett
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 3 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| 144 Filing (Primary) | 0001950047-26-006575 |
| Document: 0001950047-26-006575-index.html | 0001950047-26-006575 |
| Document: 0001950047-26-006575.txt | 0001950047-26-006575 |
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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