David Buonasera
CIK 1966857 · View on SEC EDGAR ↗
Insider
First SEC filing: March 2, 2023 · Latest: June 17, 2026
On this page
Insider at
Insider transactions
0 buys (P)
9 sells (S)
Net:
$-660,771
+ 6 non-open-market transactions below
last 12 months, based on the transactions shown below
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
6 other filings hidden
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Aug. 6, 2026 | MGNI | S 10b5-1 | 4,176 | $22.81 | $95,255 | 264,309 Direct | -1.56% | Disposed | 7.8% (price as of 2026-08-19) |
| Aug. 6, 2026 | MGNI | S 10b5-1 | 2,602 | $24.00 | $62,448 | 261,707 Direct | -0.98% | Disposed | 2.5% (price as of 2026-08-19) |
| Aug. 6, 2026 | MGNI | S 10b5-1 | 871 | $25.00 | $21,775 | 260,836 Direct | -0.33% | Disposed | -1.6% (price as of 2026-08-19) |
| July 7, 2026 | MGNI | S 10b5-1 | 1,224 | $21.00 | $25,704 | 268,485 Direct | -0.45% | Disposed | 17.1% (price as of 2026-08-19) |
| July 1, 2026 | MGNI | S 10b5-1 | 9,376 | $20.00 | $187,520 | 269,709 Direct | -3.36% | Disposed | 23.0% (price as of 2026-08-19) |
| June 17, 2026 | MGNI | S 10b5-1 | 1,409 | $19.00 | $26,771 | 279,085 Direct | -0.50% | Disposed | 29.5% (price as of 2026-08-19) |
| June 16, 2026 | MGNI | S 10b5-1 | 11,233 | $18.00 | $202,194 | 280,494 Direct | -3.85% | Disposed | 36.7% (price as of 2026-08-19) |
| June 15, 2026 | MGNI | S 10b5-1 | 1,057 | $17.00 | $17,969 | 291,727 Direct | -0.36% | Disposed | 44.7% (price as of 2026-08-19) |
| June 1, 2026 | MGNI | S | 1,409 | $15.00 | $21,135 | 292,784 | — | — | 64.0% (price as of 2026-08-19) |
| Sept. 6, 2023 | MGNI | S | 5,444 | $8.58 | $46,710 | 207,246 Direct | -2.56% | Disposed | 186.7% (price as of 2026-08-19) |
| Aug. 16, 2023 | MGNI | S | 2,648 | $8.31 | $22,005 | 212,690 Direct | -1.23% | Disposed | 196.0% (price as of 2026-08-19) |
| July 3, 2023 | MGNI | S | 6,624 | $13.43 | $88,960 | 215,338 Direct | -2.98% | Disposed | 83.2% (price as of 2026-08-19) |
| May 16, 2023 | MGNI | S | 1,559 | $10.88 | $16,962 | 221,962 Direct | -0.70% | Disposed | 126.1% (price as of 2026-08-19) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II)
Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| Jan. 2, 2024 | MGNI | Performance Stock Units | Common Stock (30,339) | — | — | 30,339 | Acquired |
| Feb. 28, 2023 | MGNI | Performance Stock Units | Common Stock (18,152) | — | — | 18,152 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 1 holding
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| March 2, 2023 | MGNI | Common Stock | 174,684 | Direct |