MPM ASSET MANAGEMENT LLC
CIK 1263048 · last filed 2026-01-14
MPM ASSET MANAGEMENT LLC is a corporate insider who has filed 26 SEC Form 4 insider transactions across 3 companies since 2010. The most recent filing, for HOWL, was dated Jul 6, 2026. Across all open-market trades the lifetime net is +$56.2M, making them a net buyer over the disclosed history. Current disclosed insider exposure totals $123.8M across reported positions. The firm reports its address in Boston, MA. 17 SEC filings were submitted jointly with Ansbert Gadicke.
"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.
AKTS 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
BOSTON, MA 02116
Holdings By Company
Recent Filings
26 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-07-06 | HOWL | Notice (144) | −15,341 | -$5.2K | EDGAR |
| 2026-06-29 | HOWL | Notice (144) | −16,830 | -$5.4K | EDGAR |
| 2026-05-28 | HOWL | Notice (144) | −38,675 | -$19.0K | EDGAR |
| 2026-05-18 | HOWL | Notice (144) | −45,998 | -$23.7K | EDGAR |
| 2026-05-11 | HOWL | Notice (144) | −13,382 | -$9.1K | EDGAR |
| 2026-05-01 | HOWL | Notice (144) | −57,588 | -$41.4K | EDGAR |
| 2026-04-29 | HOWL | Notice (144) | −20,608 | -$15.2K | EDGAR |
| 2026-04-27 | HOWL | Notice (144) | −20,608 | -$16.8K | EDGAR |
| 2026-01-14 | AKTS | Mixed | +29,755,065 | $60.09M | EDGAR |
| 2026-01-06 | HOWL | Notice (144) | −31,458 | -$20.3K | 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.