Insider · CIK 0001350876
Douglas S Knopper
Files at MGNI (MAGNITE, INC.). First filing Jun 10, 2026, latest Sep 18, 2026.
Douglas S Knopper files SEC Form 4 as director at MGNI (MAGNITE, INC.). Since Jun 10, 2026, Douglas S Knopper has reported 0 open-market buys worth $0 and 3 open-market sells worth $1.8M, the latest filed on Sep 18, 2026.
A track record needs three past buys with six months of prices behind them; Douglas S Knopper has 0, so none is measured yet.
The newest scored trade: sold $981k of MGNI on Sep 17, 2026, filed Sep 18, 2026, scored 45 (moderate), under a 10b5-1 plan. In the last 12 months: 0 buys worth $0 and 3 sells worth $1.8M.
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
MGNI: MAGNITE, INC.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 45Moderate | MAGNITE, INC. | $981k 37,337 shares | -42% | +129% from low-1% from high | |
| 35Weak | MAGNITE, INC. | $676k 37,337 shares | -23% | +66% from low-30% from high | |
| 21Weak | MAGNITE, INC. | $169k 10,766 shares | -6% | +40% from low-41% from high |
Transactions
Every row this insider has filed, 5 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Sep 17, 2026 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -37,337 | $26.28 | $981k | 51,136 | 25 d ago |
| Jun 16, 2026 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -37,337 | $18.10 | $676k | 125,810 | Jun 17, 2026 |
| Jun 8, 2026 | MGNI MAGNITE, INC. | AGrant or award Common Stock10b5-1 | +13,798 | $0.00 | $0 | 173,913 | Jun 10, 2026 |
| Jun 10, 2026 | MGNI MAGNITE, INC. | SOpen-market sale Common Stock10b5-1 | -10,766 | $15.73 | $169k | 163,147 | Jun 10, 2026 |
| Jun 5, 2025 | MGNI MAGNITE, INC. | AGrant or award Common Stock | +10,766 | $0.00 | $0 | 160,115 | Jun 6, 2025 |
Questions about Douglas S Knopper
Answered from the filings on this page, as of the latest one.
Is Douglas S Knopper buying or selling?
In the last 12 months Douglas S Knopper reported 0 open-market buys worth $0 and 3 open-market sells worth $1.8M on SEC Form 4; the latest was sold $981k of MGNI on Sep 17, 2026. Grants, option exercises and tax withholding are not counted.
How did Douglas S Knopper's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Douglas S Knopper has 0.
Where does Douglas S Knopper file Form 4?
Douglas S Knopper has filed Form 4 at MGNI (MAGNITE, INC.). A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.