Michael G. Barrett
CIK 1100612 · CEO · last filed 2026-09-21
"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.
Charts
Trading activity, where the exposure sits, and each trade against the stock price.
MGNI price and trades
Daily close with each Form 4 filing on this company marked: green = open-market buy, red = open-market sale, purple = grants, exercises, gifts and other non-market transactions. Marker size scales with the dollar value.
Shares held
Shares owned after each reported transaction on this company (direct holdings as reported).
Open-market buying and selling
by monthDollar value of open-market purchases (code P, up) and sales (code S, down) across all companies, by filing month. Grants, exercises and gifts are excluded.
Exposure by company
latestMost recently reported shares × current price. Faded bars (*) have had no filing in 3 years, so the person may no longer hold them. Click a bar to chart that company.
Filer Profile
12181 BLUFF CREEK DRIVE, 4TH FLOOR
PLAYA VISTA, CA 90094
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| OUT | Director | 6,312 | $31.70 | $200.1K | $0 | 3 | 2026-09-21 |
| MGNI | CEO | 392,670 | $21.62 | $8.49M | -$52.80M | 51 | 2026-08-18 |
| RUBI | CEO | 42 | $0.15 | $7 | -$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 5 of 10
94 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2024-08-16 | MGNI | Mixed | −107,941 | -$1.36M | EDGAR |
| 2024-08-15 | MGNI | Notice (144) | −75,000 | -$939.0K | EDGAR |
| 2024-07-17 | MGNI | Sell (S) | −100,000 | -$1.50M | EDGAR |
| 2024-07-15 | MGNI | Notice (144) | −100,000 | -$1.50M | EDGAR |
| 2024-05-17 | MGNI | Mixed | −85,441 | -$778.8K | EDGAR |
| 2024-05-15 | MGNI | Notice (144) | −75,000 | -$678.0K | EDGAR |
| 2024-03-18 | MGNI | Notice (144) | −75,000 | -$840.9K | EDGAR |
| 2024-03-18 | MGNI | Sell (S) | −75,000 | -$840.8K | EDGAR |
| 2024-02-16 | MGNI | Tax (F) | −20,400 | -$198.7K | EDGAR |
| 2024-01-04 | MGNI | Grant (A) | +121,951 | $0 | EDGAR |
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.