Tananbaum James B. (CIK 0001581754)

Latest company ownership

Role: Director
Shares held
13,163,825
Last filed at
Nov 25, 2025
Confidence Score
89.1
2025Q4
Confidence Score History
2024Q3 2025Q4
Shares held
4,840,250
Last filed at
Oct 6, 2021
Confidence Score
50.0
2025Q4
Confidence Score History
2020Q3 2025Q4
Role: 10% Owner
Shares held
3,430,198
Last filed at
Apr 15, 2020
Confidence Score
50.0
2025Q4
Confidence Score History
2019Q3 2025Q4

Recent buy/sell transactions

Exec date Filing date Company Role Signal Confidence Shares % of shares Under plan? Amount (USD)
Nov 21, 2025 Nov 25, 2025 ALUMIS INC. Director Buy 90.0 +72,212 2.84% $532.9K
Nov 17, 2025 Nov 19, 2025 ALUMIS INC. Director Buy 100.0 +507,874 24.97% $3.1M
May 2, 2025 May 6, 2025 ALUMIS INC. Director Buy 82.5 +45,000 1.07% $202.3K
Jul 1, 2024 Jul 3, 2024 ALUMIS INC. Director Buy 100.0 +2,500,000 34.31% $40M
Aug 14, 2020 Oct 19, 2020 Disc Medicine, Inc. CEO Buy 100.0 +441,500 100.00% $4.4M
May 12, 2020 May 14, 2020 10x Genomics, Inc. 10% Owner Sell 15.0 -1,450,000 -19.86% $116.2M
Mar 4, 2020 Mar 19, 2020 10x Genomics, Inc. 10% Owner Sell 15.0 -1,571,803 -45.52% $44.3M
Sep 12, 2019 Sep 16, 2019 10x Genomics, Inc. 10% Owner Buy 100.0 +187,500 100.00% $7.3M