This Form 144 reflects routine insider liquidity under a 10b5-1 plan and does not indicate a fundamental concern. Monitor for any acceleration of insider selling outside the plan or a change in the pattern.
Price Chart
Executive Summary
Director Douglas Knopper filed a Form 144 notice indicating intent to sell 37,337 shares of Magnite common stock with an approximate value of $625K. The shares were acquired upon RSU vesting between 2021 and 2025, and the sale is pre-arranged under a 10b5-1 trading plan, making this a routine diversification move with no material trading signal.
Key Facts
- Director Douglas Knopper files Form 144 to sell 37,337 shares.
- Estimated sale value of ~$625,395 (based on filing estimate).
- Shares acquired from RSU vesting from June 2021 through June 2025.
- Sale is part of a pre-established 10b5-1 trading plan.
- Director also executed a prior sale of 10,766 shares on June 10, 2026.
Financial Impact
~$625K sale, representing ~0.026% of Magnite's $2.4B market cap — negligible dilution impact.
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 3 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| 144 Filing (Primary) | 0001950047-26-006219 |
| Document: 0001950047-26-006219-index.html | 0001950047-26-006219 |
| Document: 0001950047-26-006219.txt | 0001950047-26-006219 |
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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