MICHAEL E PORTER
CIK 1108494 · last filed 2017-09-15
"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
$37.79M
Companies
5
Total Filings
83
Lifetime Open-Market Net
-$1.81M
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 |
|---|---|---|---|---|---|---|---|
| MERRIMACK PHARMACEUTICALS INC (MACK) Delisted | Director | 839,448 | $15.13 | $12.70M | $2.57M | 31 | 2017-09-15 |
| PTC | Director | 231,599 | $115.72 | $26.80M | -$371.8K | 4 | 2015-03-05 |
| SMG | Director | 22,204 | $69.91 | $1.55M | $118.1K | 15 | 2015-02-02 |
| PTC INC. (PMTC) Delisted | Director | 220,579 | — | — | -$1.51M | 16 | 2013-12-02 |
| TMO | Director | 18,390 | $513.03 | $9.43M | -$2.62M | 17 | 2012-03-12 |
Recent Filings · Page 3 of 9
83 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 |
|---|---|---|---|---|---|
| 2014-12-12 | SMG | Grant (A) | — | $0 | EDGAR |
| 2014-12-04 | MERRIMACK PHARMACEUTICALS INC (MACK) Delisted | Buy (P) | +8,000 | $69.7K | EDGAR |
| 2014-11-24 | MERRIMACK PHARMACEUTICALS INC (MACK) Delisted | Buy (P) | +11,909 | $105.7K | EDGAR |
| 2014-11-18 | MERRIMACK PHARMACEUTICALS INC (MACK) Delisted | Buy (P) | +5,000 | $41.4K | EDGAR |
| 2014-11-17 | PTC | Exer (M) | +3,107 | $0 | EDGAR |
| 2014-11-13 | MERRIMACK PHARMACEUTICALS INC (MACK) Delisted | Buy (P) | +40,000 | $334.8K | EDGAR |
| 2014-10-24 | SMG | Other (J) | — | $0 | EDGAR |
| 2014-09-19 | SMG | Grant (A) | — | $0 | EDGAR |
| 2014-09-12 | SMG | Grant (A) | — | $0 | EDGAR |
| 2014-08-19 | SMG | Buy (P) | +810 | $46.1K | 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.