Latest filing published 09 Feb 2026 for Generation Bio Co..
Filing timeline
BuySaleInsider track record
Closed purchases
Not enough history yet: 1 closed purchase, at least 2 are needed.
Purchases by company
Since each purchase
- -18.2%Entry US$275.52 · Close at T+365 US$225.48
Entry is the close on the day after publication, the first price a reader could act on. Prices in the listing currency. Past moves are not a forecast.
Atlas Venture Fund X, L.P.: trading record in brief
Atlas Venture Fund X, L.P. is a declared insider at 7 companies; the most frequent names are Kymera Therapeutics, Inc., Disc Medicine, Inc. and Generation Bio Co. Between 25 June 2018 and 9 February 2026, the trades on record add up to 109 filings.
In open-market terms, that means 1 purchase worth €13.3M on one side and 76 sales worth €102.4M on the other. On balance, insiders were net sellers of €89.1M. A purchase on the market is a deliberate choice to commit personal money, which is why it draws more attention than a grant.
Most recently, on 9 February 2026, the filings show a transaction in Generation Bio Co. The last purchase on record was published on 23 July 2019, which is 2,665 days ago. Between a trade and the moment it shows up on SEC (Form 4), the median delay is 2 days. The legal deadline for a Form 4 is two business days after the transaction. Selling is not necessarily a view on the stock: liquidity needs and diversification are common motives. Every figure here comes from the filings published by SEC (Form 4) and describes the past, not future prices; it is not investment advice.
Companies and markets linked to Atlas Venture Fund X, L.P.
Open company profiles for insider transactions, fundamentals and analyst consensus when available.
- 116,693 sharesCommon StockSEC:0001231919-26-000124:1
- 60 sharesCommon StockSEC:0001231919-26-000124:2
- 711,193 sharesCommon StockSEC:0001231919-26-000124:0
- 37,180 shares@ US$42.778.6% of flowCommon StockSEC:0001415889-24-007894:0
- 5,122 shares@ US$43.420.5% of flowCommon StockSEC:0001415889-24-007894:1
- 7,837 shares@ US$42.770.8% of flowCommon StockSEC:0001415889-24-007894:2
- 1,045 shares@ US$43.420.1% of flowCommon StockSEC:0001415889-24-007894:3
- 126,066 shares@ US$41.9412.5% of flowCommon StockSEC:0001415889-24-007894:4
- 8,581 shares@ US$42.520.9% of flowCommon StockSEC:0001415889-24-007894:5
- 26,452 shares@ US$41.942.6% of flowCommon StockSEC:0001415889-24-007894:6
- 1,819 shares@ US$42.520.2% of flowCommon StockSEC:0001415889-24-007894:7
- 108,404 shares@ US$42.1910.8% of flowCommon StockSEC:0001415889-24-007894:8
- 6,686 shares@ US$42.840.7% of flowCommon StockSEC:0001415889-24-007894:9
- 22,779 shares@ US$42.192.3% of flowCommon StockSEC:0001415889-24-007894:10
- 1,386 shares@ US$42.840.1% of flowCommon StockSEC:0001415889-24-007894:11
- 82,500 shares@ US$67.658.8% of flowCommon StockSEC:0001209191-24-002231:1
- 20,000 shares@ US$67.652.1% of flowCommon StockSEC:0001209191-24-002231:2
- 47,500 shares@ US$67.6520.0% of flowCommon StockSEC:0001209191-24-002231:0
- 20,000 shares@ US$64.002.0% of flowCommon StockSEC:0001209191-24-001540:1
- 30,000 shares@ US$64.0011.9% of flowCommon StockSEC:0001209191-24-001540:0
- 632 shares@ US$60.990.1% of flowCommon StockSEC:0001209191-23-058707:2
- 422 shares@ US$60.990.0% of flowCommon StockSEC:0001209191-23-058707:3
- 6,234 shares@ US$62.420.6% of flowCommon StockSEC:0001209191-23-058707:4
- 4,155 shares@ US$62.420.4% of flowCommon StockSEC:0001209191-23-058707:5
- 994 shares@ US$62.900.1% of flowCommon StockSEC:0001209191-23-058707:6
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