David Buonasera
CIK 1966857 · CHIEF TECHNOLOGY OFFICER · last filed 2026-07-09
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
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Disclosed Exposure
$5.29M
Companies
1
Total Filings
50
Lifetime Open-Market Net
-$1.92M
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| MGNI | CHIEF TECHNOLOGY OFFICER | 268,485 | $19.70 | $5.29M | -$1.92M | 32 | 2026-07-09 |
Recent Filings · Page 5 of 5
50 filingsInsider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2024-05-17 | MGNI | Mixed | −13,132 | -$143.5K | EDGAR |
| 2024-02-16 | MGNI | Tax (F) | −6,765 | -$65.9K | EDGAR |
| 2024-01-04 | MGNI | Grant (A) | +85,058 | $0 | EDGAR |
| 2023-11-17 | MGNI | Tax (F) | −1,665 | -$13.1K | EDGAR |
| 2023-09-07 | MGNI | Sell (S) | −5,444 | -$46.7K | EDGAR |
| 2023-09-05 | MGNI | Notice (144) | −5,900 | -$49.8K | EDGAR |
| 2023-08-18 | MGNI | Sell (S) | −2,648 | -$22.0K | EDGAR |
| 2023-07-06 | MGNI | Sell (S) | −6,624 | -$89.0K | EDGAR |
| 2023-05-18 | MGNI | Sell (S) | −1,559 | -$17.0K | EDGAR |
| 2023-03-02 | MGNI | Grant (A) | +46,873 | $0 | EDGAR |
Showing 41–50 of 50
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Page 5 of 5
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.