MPM BIOVENTURES 2018, L.P.

Other reporting person · Ten-percent owner · TRDA, AKTS, ITOS

As of 2026-09-16, MPM BIOVENTURES 2018, L.P. has 46 Form 4 transactions on record across 3 companies — 43 in the trailing 12 months.

Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.

Reconstructed holdings

Direct: $0Indirect: $255.9M$255.9Mas of 2026-09-16
  • Direct $0
  • Indirect $255.9M
AKTSindirect9,147,287 sh$207.7M
TRDAindirect3,885,115 sh$26.8M
ITOSindirect2,108,594 sh$21.4M

Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.

Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.

Trades by company

AKTS · 31 trades
2026-01-12: Purchase, 1,112,777 sh ($20.0M)2026-01-12: Conversion, 6,000,000 sh ($0)2026-01-12: Conversion, 22,500,000 sh ($0)2026-01-12: Conversion, 5,000,000 sh ($0)2026-01-12: Conversion, 1,314,262 sh2026-01-12: Conversion, 5,914,197 sh2026-01-12: Conversion, 1,577,119 sh2026-01-12: Conversion, 1,314,262 sh2026-01-12: Conversion, 5,914,197 sh2026-01-12: Conversion, 1,577,119 sh2026-01-12: Conversion, 5,914,197 sh2026-01-12: Conversion, 1,577,119 sh2026-01-12: Conversion, 1,314,262 sh2026-01-12: Conversion, 5,914,197 sh2026-01-12: Conversion, 1,577,119 sh2026-01-12: Conversion, 1,314,262 sh2026-01-12: Conversion, 1,314,262 sh2026-01-12: Conversion, 5,914,197 sh2026-01-12: Conversion, 1,577,119 sh2026-01-12: Conversion, 1,314,262 sh2026-01-12: Conversion, 1,314,262 sh2026-01-12: Conversion, 5,914,197 sh2026-01-12: Conversion, 1,577,119 sh2026-01-12: Conversion, 5,914,197 sh2026-01-12: Conversion, 1,577,119 sh2026-01-12: Conversion, 1,314,262 sh2026-01-12: Conversion, 5,914,197 sh2026-01-12: Conversion, 1,577,119 sh2026-01-12: Conversion, 1,314,262 sh2026-01-12: Conversion, 5,914,197 sh2026-01-12: Conversion, 1,577,119 sh
TRDA · 14 trades
2026-09-09: Sale, 28,837 sh ($206K)2026-09-08: Sale, 192,500 sh ($1.4M)2026-09-04: Sale, 38,500 sh ($274K)2026-09-03: Sale, 32,263 sh ($231K)2026-09-02: Sale, 25,131 sh ($181K)2026-09-01: Sale, 29,088 sh ($205K)2026-08-31: Sale, 44,259 sh ($309K)2026-08-28: Sale, 3,733 sh ($26K)2026-08-27: Sale, 38,922 sh ($280K)2026-08-26: Sale, 14,569 sh ($103K)2026-08-25: Sale, 26,522 sh ($200K)2026-08-24: Sale, 21,623 sh ($159K)2024-12-11: Sale, 21,787 sh ($441K)2024-12-10: Sale, 22,935 sh ($476K)
ITOS · 1 trade
2025-05-13: Sale, 630,191 sh ($5.1M)

Filing ledger

DateCompanyActionShares @ priceValueOwnership ΔOwned afterFiling
2026-09-09TRDASale28,837 @ $7.13$206K−0.7% of holding3,885,115Form 4
2026-09-08TRDASale192,500 @ $7.41$1.4M−4.7% of holding3,913,952Form 4
2026-09-04TRDASale38,500 @ $7.11$274K−0.9% of holding4,106,452Form 4
2026-09-03TRDASale32,263 @ $7.17$231K−0.8% of holding4,144,952Form 4
2026-09-02TRDASale25,131 @ $7.19$181K−0.6% of holding4,177,215Form 4
2026-09-01TRDASale29,088 @ $7.06$205K−0.7% of holding4,202,346Form 4
2026-08-31TRDASale44,259 @ $6.99$309K−1.0% of holding4,231,434Form 4
2026-08-28TRDASale3,733 @ $7.01$26K−0.1% of holding4,275,693Form 4
2026-08-27TRDASale38,922 @ $7.20$280K−0.9% of holding4,279,426Form 4
2026-08-26TRDASale14,569 @ $7.06$103K−0.3% of holding4,318,348Form 4
2026-08-25TRDASale26,522 @ $7.54$200K−0.6% of holding4,332,917Form 4
2026-08-24TRDASale21,623 @ $7.34$159K−0.5% of holding4,359,439Form 4
2026-01-12AKTSPurchase1,112,777 @ $18.00$20.0M+12.2% of holding10,260,064Form 4
2025-05-13ITOSSale630,191 @ $8.06$5.1M−23.0% of holding2,108,594Form 4
2024-12-11TRDASale21,787 @ $20.23$441K−0.5% of holding4,381,062Form 4
2024-12-10TRDASale22,935 @ $20.77$476K−0.5% of holding4,402,849Form 4
30 award / exercise / gift records — not counted as purchases
DateCompanyActionSharesOwned afterFiling
2026-01-12AKTSConversion6,000,0000Form 4
2026-01-12AKTSConversion22,500,0000Form 4
2026-01-12AKTSConversion5,000,0000Form 4
2026-01-12AKTSConversion1,314,2621,655,971Form 4
2026-01-12AKTSConversion5,914,1977,570,168Form 4
2026-01-12AKTSConversion1,577,1199,147,287Form 4
2026-01-12AKTSConversion1,314,2621,655,971Form 4
2026-01-12AKTSConversion5,914,1977,570,168Form 4
2026-01-12AKTSConversion1,577,1199,147,287Form 4
2026-01-12AKTSConversion5,914,1977,570,168Form 4
2026-01-12AKTSConversion1,577,1199,147,287Form 4
2026-01-12AKTSConversion1,314,2621,655,971Form 4
2026-01-12AKTSConversion5,914,1977,570,168Form 4
2026-01-12AKTSConversion1,577,1199,147,287Form 4
2026-01-12AKTSConversion1,314,2621,655,971Form 4
2026-01-12AKTSConversion1,314,2621,655,971Form 4
2026-01-12AKTSConversion5,914,1977,570,168Form 4
2026-01-12AKTSConversion1,577,1199,147,287Form 4
2026-01-12AKTSConversion1,314,2621,655,971Form 4
2026-01-12AKTSConversion1,314,2621,655,971Form 4
2026-01-12AKTSConversion5,914,1977,570,168Form 4
2026-01-12AKTSConversion1,577,1199,147,287Form 4
2026-01-12AKTSConversion5,914,1977,570,168Form 4
2026-01-12AKTSConversion1,577,1199,147,287Form 4
2026-01-12AKTSConversion1,314,2621,655,971Form 4
2026-01-12AKTSConversion5,914,1977,570,168Form 4
2026-01-12AKTSConversion1,577,1199,147,287Form 4
2026-01-12AKTSConversion1,314,2621,655,971Form 4
2026-01-12AKTSConversion5,914,1977,570,168Form 4
2026-01-12AKTSConversion1,577,1199,147,287Form 4

Source: SEC Form 4 filings. Each row links to its original filing.

Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.