MICHAEL G. BARRETT
CIK 1100612 · CEO · last filed 2026-07-17
"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
$7.94M
Companies
5
Total Filings
89
Lifetime Open-Market Net
-$41.66M
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 | CEO | 403,074 | $19.70 | $7.94M | -$39.44M | 48 | 2026-07-17 |
| OUT | Director | — | $32.48 | — | $0 | 2 | 2026-06-04 |
| RUBI | CEO | 28 | $2.16 | $60 | -$2.22M | 13 | 2020-06-05 |
| Millennial Media Inc. (MM) Delisted | President and CEO | 0 | — | — | $0 | 4 | 2015-10-23 |
| Telaria, Inc. (TRMR) Delisted | Director | — | $5.02 | — | $0 | 1 | 2013-10-01 |
Recent Filings · Page 2 of 9
89 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 |
|---|---|---|---|---|---|
| 2026-01-12 | MGNI | Mixed | +104,008 | -$1.77M | EDGAR |
| 2026-01-05 | MGNI | Grant (A) | +94,044 | $0 | EDGAR |
| 2025-11-18 | MGNI | Tax (F) | −12,198 | -$172.6K | EDGAR |
| 2025-09-22 | OUT | Grant (A) | — | $0 | EDGAR |
| 2025-08-20 | MGNI | Sell (S) | −35,951 | -$857.4K | EDGAR |
| 2025-08-15 | MGNI | Notice (144) | −39,054 | -$925.6K | EDGAR |
| 2025-07-17 | MGNI | Sell (S) | −70,900 | -$1.65M | EDGAR |
| 2025-07-15 | MGNI | Notice (144) | −70,900 | -$1.65M | EDGAR |
| 2025-06-26 | MGNI | Sell (S) | −300,000 | -$6.00M | EDGAR |
| 2025-06-25 | MGNI | Notice (144) | −300,000 | -$6.00M | 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.