Insider profile
MPM BIOVENTURES 2018, L.P.
This page tracks every SEC Form 4 filing since April 2023 by MPM BIOVENTURES 2018, L.P.: 10 transactions in total, including 1 open-market purchase and 3 sales. Each record is parsed directly from the original filing, with amendments reconciled so a corrected filing never double-counts.
Activity summary
No insider transactions in the last 30 days. The most recent was on January 12, 2026, when Mpm Bioventures 2018, L.p. sold 22,500,000 shares. The full history is listed below.
Quarterly balance
Buy and sell value by quarter, Q4 24 to Q1 26. MPM BIOVENTURES 2018, L.P. has been a net buyer across the period shown.
Bars below the rule are sales, above are purchases. Largest quarter on the chart is $20.0M.
Track record
Transaction History
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Jan 12, 2026 | Mpm Bioventures 2018, L.p. | AKTS | C | 22,500,000 | — | — |
| Jan 12, 2026 | Mpm Bioventures 2018, L.p. | AKTS | Purchase | 1,112,777 | $18.00 | $20.03M |
| Jan 12, 2026 | Mpm Bioventures 2018, L.p. | AKTS | C | 1,577,119 | — | — |
| Jan 12, 2026 | Mpm Bioventures 2018, L.p. | AKTS | C | 5,000,000 | — | — |
| Jan 12, 2026 | Mpm Bioventures 2018, L.p. | AKTS | C | 1,314,262 | — | — |
5 more transactions hidden
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Reading an insider's Form 4 history
Corporate insiders — directors, officers, and holders of more than 10% of a company's stock — must report their trades to the SEC on Form 4 within two business days. Looking at one insider's filings over time shows whether they tend to buy on the open market (a discretionary use of their own money, generally the strongest signal), sell, or simply receive and exercise equity awards as compensation.
The track record above measures how this insider's past open-market purchases performed in the months after each filing. Trades made under a pre-scheduled Rule 10b5-1 plan are flagged because they carry no timing signal. To pull any insider's full history programmatically, see the insider trading API or our guide to reading Form 4 filings.