Sean Patrick Buckley
CIK 1865116 · See Remarks · 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
$6.98M
Companies
1
Total Filings
58
Lifetime Open-Market Net
-$4.76M
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 | See Remarks | 354,281 | $19.70 | $6.98M | -$4.76M | 37 | 2026-07-09 |
Recent Filings · Page 2 of 6
58 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 |
|---|---|---|---|---|---|
| 2025-11-18 | MGNI | Notice (144) | −4,426 | -$59.1K | EDGAR |
| 2025-11-18 | MGNI | Mixed | −16,068 | -$223.9K | EDGAR |
| 2025-09-10 | MGNI | Sell (S) | −40,000 | -$1.00M | EDGAR |
| 2025-09-09 | MGNI | Notice (144) | −20,000 | -$492.1K | EDGAR |
| 2025-09-08 | MGNI | Notice (144) | −20,000 | -$511.2K | EDGAR |
| 2025-08-20 | MGNI | Sell (S) | −20,201 | -$477.8K | EDGAR |
| 2025-08-19 | MGNI | Notice (144) | −9,315 | -$218.2K | EDGAR |
| 2025-08-15 | MGNI | Notice (144) | −14,461 | -$342.7K | EDGAR |
| 2025-05-16 | MGNI | Notice (144) | −9,692 | -$152.5K | EDGAR |
| 2025-05-16 | MGNI | Mixed | −24,741 | -$391.4K | EDGAR |
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.