David Buonasera
Insider
First SEC filing: March 2, 2023 · Latest: June 17, 2026
Insider at
Insider transactions
0 buys (P)
12 sells (S)
Net: $-840,595
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Sept. 14, 2026 | MGNI | S 10b5-1 | 1,165 | $24.00 | $27,960 | 245,155 Direct | -0.47% | Disposed | 3.0% (price as of 2026-10-02) |
| Sept. 2, 2026 | MGNI | S 10b5-1 | 1,043 | $25.00 | $26,075 | 246,320 Direct | -0.42% | Disposed | -1.1% (price as of 2026-10-02) |
| Sept. 1, 2026 | MGNI | S 10b5-1 | 5,371 | $23.42 | $125,789 | 247,363 Direct | -2.13% | Disposed | 5.6% (price as of 2026-10-02) |
| Aug. 15, 2026 | MGNI | F | 8,102 | $24.73 | $200,362 | 252,734 Direct | -3.11% | Disposed | 0.0% (price as of 2026-10-02) |
| Aug. 6, 2026 | MGNI | S 10b5-1 | 4,176 | $22.81 | $95,255 | 264,309 Direct | -1.56% | Disposed | 8.4% (price as of 2026-10-02) |
| Aug. 6, 2026 | MGNI | S 10b5-1 | 2,602 | $24.00 | $62,448 | 261,707 Direct | -0.98% | Disposed | 3.0% (price as of 2026-10-02) |
| Aug. 6, 2026 | MGNI | S 10b5-1 | 871 | $25.00 | $21,775 | 260,836 Direct | -0.33% | Disposed | -1.1% (price as of 2026-10-02) |
| July 7, 2026 | MGNI | S 10b5-1 | 1,224 | $21.00 | $25,704 | 268,485 Direct | -0.45% | Disposed | 17.8% (price as of 2026-10-02) |
| July 1, 2026 | MGNI | S 10b5-1 | 9,376 | $20.00 | $187,520 | 269,709 Direct | -3.36% | Disposed | 23.7% (price as of 2026-10-02) |
| June 17, 2026 | MGNI | S 10b5-1 | 1,409 | $19.00 | $26,771 | 279,085 Direct | -0.50% | Disposed | 30.2% (price as of 2026-10-02) |
| June 16, 2026 | MGNI | S 10b5-1 | 11,233 | $18.00 | $202,194 | 280,494 Direct | -3.85% | Disposed | 37.4% (price as of 2026-10-02) |
| June 15, 2026 | MGNI | S 10b5-1 | 1,057 | $17.00 | $17,969 | 291,727 Direct | -0.36% | Disposed | 45.5% (price as of 2026-10-02) |
| June 1, 2026 | MGNI | S 10b5-1 | 1,409 | $15.00 | $21,135 | 292,784 Direct | -0.48% | Disposed | 64.9% (price as of 2026-10-02) |
| May 15, 2026 | MGNI | F | 8,335 | $12.82 | $106,855 | 294,193 Direct | -2.76% | Disposed | 92.9% (price as of 2026-10-02) |
| Feb. 15, 2026 | MGNI | F | 17,137 | $11.70 | $200,503 | 302,095 Direct | -5.37% | Disposed | 111.4% (price as of 2026-10-02) |
| Jan. 9, 2026 | MGNI | M | 22,935 | · | · | 331,562 Direct | +7.43% | Acquired | (price as of 2026-10-02) |
| Jan. 9, 2026 | MGNI | F | 12,330 | $16.17 | $199,376 | 319,232 Direct | -3.72% | Disposed | 52.9% (price as of 2026-10-02) |
| Jan. 9, 2026 | MGNI | M | 22,935 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| Jan. 1, 2026 | MGNI | A | 76,803 | · | · | 308,627 Direct | +33.13% | Acquired | (price as of 2026-10-02) |
| Jan. 1, 2026 | MGNI | A | 25,801 | · | · | 25,801 Direct | · | Acquired | (price as of 2026-10-02) |
| Nov. 15, 2025 | MGNI | F | 7,129 | $14.15 | $100,875 | 231,824 Direct | -2.98% | Disposed | 74.8% (price as of 2026-10-02) |
| Sept. 3, 2025 | MGNI | S 10b5-1 | 2,950 | $25.37 | $74,842 | 238,629 Direct | -1.22% | Disposed | -2.5% (price as of 2026-10-02) |
| Aug. 18, 2025 | MGNI | S | 7,834 | $23.85 | $186,841 | 241,579 Direct | -3.14% | Disposed | 3.7% (price as of 2026-10-02) |
| June 30, 2025 | MGNI | S 10b5-1 | 9,289 | $22.00 | $204,358 | 249,413 Direct | -3.59% | Disposed | 12.4% (price as of 2026-10-02) |
| May 27, 2025 | MGNI | S 10b5-1 | 8,742 | $16.00 | $139,872 | 258,702 Direct | -3.27% | Disposed | 54.6% (price as of 2026-10-02) |
| May 23, 2025 | MGNI | S 10b5-1 | 3,653 | $15.03 | $54,905 | 267,444 Direct | -1.35% | Disposed | 64.5% (price as of 2026-10-02) |
| May 15, 2025 | MGNI | F | 8,038 | $15.88 | $127,643 | 271,097 Direct | -2.88% | Disposed | 55.7% (price as of 2026-10-02) |
| Feb. 15, 2025 | MGNI | F | 17,384 | $20.00 | $347,680 | 278,795 Direct | -5.87% | Disposed | 23.7% (price as of 2026-10-02) |
| Jan. 9, 2025 | MGNI | A | 72,384 | · | · | 296,179 Direct | +32.34% | Acquired | (price as of 2026-10-02) |
| Jan. 9, 2025 | MGNI | A | 24,366 | · | · | 24,366 Direct | · | Acquired | (price as of 2026-10-02) |
| Dec. 13, 2024 | MGNI | S 10b5-1 | 1,969 | $16.31 | $32,114 | 223,795 Direct | -0.87% | Disposed | 51.6% (price as of 2026-10-02) |
| Nov. 27, 2024 | MGNI | S 10b5-1 | 431 | $16.78 | $7,232 | 225,764 Direct | -0.19% | Disposed | 47.4% (price as of 2026-10-02) |
| Nov. 22, 2024 | MGNI | S 10b5-1 | 9,219 | $17.00 | $156,723 | 226,195 Direct | -3.92% | Disposed | 45.5% (price as of 2026-10-02) |
| Nov. 18, 2024 | MGNI | S 10b5-1 | 277 | $15.77 | $4,368 | 235,414 Direct | -0.12% | Disposed | 56.8% (price as of 2026-10-02) |
| Nov. 15, 2024 | MGNI | F | 5,056 | $15.85 | $80,138 | 235,691 Direct | -2.10% | Disposed | 56.0% (price as of 2026-10-02) |
| Nov. 14, 2024 | MGNI | S 10b5-1 | 12,412 | $16.41 | $203,681 | 240,403 Direct | -4.91% | Disposed | 50.7% (price as of 2026-10-02) |
| Sept. 1, 2024 | MGNI | F | 5,287 | $13.79 | $72,908 | 252,815 Direct | -2.05% | Disposed | 79.3% (price as of 2026-10-02) |
| Aug. 15, 2024 | MGNI | F | 3,760 | $12.51 | $47,038 | 268,102 Direct | -1.38% | Disposed | 97.7% (price as of 2026-10-02) |
| Aug. 15, 2024 | MGNI | S 10b5-1 | 10,000 | $12.65 | $126,500 | 258,102 Direct | -3.73% | Disposed | 95.5% (price as of 2026-10-02) |
| May 16, 2024 | MGNI | S 10b5-1 | 5,500 | $12.50 | $68,750 | 271,862 Direct | -1.98% | Disposed | 97.8% (price as of 2026-10-02) |
| May 15, 2024 | MGNI | F | 7,632 | $9.80 | $74,794 | 276,242 Direct | -2.69% | Disposed | 152.3% (price as of 2026-10-02) |
| Feb. 15, 2024 | MGNI | F | 6,765 | $9.74 | $65,891 | 283,874 Direct | -2.33% | Disposed | 153.9% (price as of 2026-10-02) |
| Jan. 2, 2024 | MGNI | A | 30,339 | · | · | 30,339 Direct | · | Acquired | (price as of 2026-10-02) |
| Jan. 2, 2024 | MGNI | A | 85,058 | · | · | 290,639 Direct | +41.37% | Acquired | (price as of 2026-10-02) |
| Nov. 15, 2023 | MGNI | F | 1,665 | $7.89 | $13,137 | 205,581 Direct | -0.80% | Disposed | 213.4% (price as of 2026-10-02) |
| Sept. 6, 2023 | MGNI | S | 5,444 | $8.58 | $46,710 | 207,246 Direct | -2.56% | Disposed | 188.2% (price as of 2026-10-02) |
| Aug. 16, 2023 | MGNI | S | 2,648 | $8.31 | $22,005 | 212,690 Direct | -1.23% | Disposed | 197.6% (price as of 2026-10-02) |
| July 3, 2023 | MGNI | S | 6,624 | $13.43 | $88,960 | 215,338 Direct | -2.98% | Disposed | 84.1% (price as of 2026-10-02) |
| May 16, 2023 | MGNI | S | 1,559 | $10.88 | $16,962 | 221,962 Direct | -0.70% | Disposed | 127.3% (price as of 2026-10-02) |
| Feb. 28, 2023 | MGNI | A | 18,152 | · | · | 18,152 Direct | · | Acquired | (price as of 2026-10-02) |
| Feb. 28, 2023 | MGNI | A | 46,873 | · | · | 221,557 Direct | +26.83% | Acquired | (price as of 2026-10-02) |
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. 9, 2026 | MGNI | Performance Stock Units | Common Stock | · | · | 22,935 | Disposed |
| Jan. 1, 2026 | MGNI | Performance Stock Units | Common Stock | · | · | 25,801 | Acquired |
| Jan. 9, 2025 | MGNI | Performance Stock Units | Common Stock | · | · | 24,366 | Acquired |
| Jan. 2, 2024 | MGNI | Performance Stock Units | Common Stock | · | · | 30,339 | Acquired |
| Feb. 28, 2023 | MGNI | Performance Stock Units | Common Stock | · | · | 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 |