WaveMan · Form 4
Tananbaum James B. insider trades
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Tananbaum James B. insider trades

Tananbaum James B. has filed 17 Form 4s with the SEC that we hold, for Alumis INC. (ALMS) (Director, 10% owner), KNTE (Director, 10% owner), PRDS (Director, 10% owner) and Aclaris Therapeutics, Inc. (ACRS) (10% owner), among 6 companies in all. Across all of them we count 16 purchases worth $60.0M and 0 sales worth $0 reported on Form 4. In the last 12 months: 8 purchases ($13.1M) and 0 sales ($0). The largest single trade was a purchase of 2,187,500 shares of Alumis INC. worth $35.0M, dated 2024-07-01. The first filing on our record is dated 2021-10-06 and the latest 2026-08-10.

Alumis INC. (ALMS)

Director, 10% owner · 6 filings · 11 purchases and sales
Trade dateCodeSharesValue as filedFiled
2024-07-01P, purchase reported on Form 4312,500$5.0M2024-07-03
2024-07-01P, purchase reported on Form 42,187,500$35.0M2024-07-03
2025-05-02P, purchase reported on Form 425,000$115.5K2025-05-06
2025-05-06P, purchase reported on Form 420,000$86.8K2025-05-06
2025-11-17P, purchase reported on Form 4150,000$838.5K2025-11-19
2025-11-17P, purchase reported on Form 450,000$280.0K2025-11-19
2025-11-18P, purchase reported on Form 4117,374$726.5K2025-11-19
2025-11-19P, purchase reported on Form 4190,500$1.2M2025-11-19
2025-11-21P, purchase reported on Form 472,212$532.9K2025-11-25
2026-01-08P, purchase reported on Form 4294,117$5.0M2026-01-12
2026-01-08P, purchase reported on Form 4117,647$2.0M2026-01-12

KNTE

Director, 10% owner · 4 filings · 2 purchases and sales
Trade dateCodeSharesValue as filedFiled
2023-05-08P, purchase reported on Form 4229,044$641.3K2023-05-10
2023-05-08P, purchase reported on Form 41,550,956$4.3M2023-05-10

PRDS

Director, 10% owner · 4 filings · 2 purchases and sales
Trade dateCodeSharesValue as filedFiled
2022-12-01P, purchase reported on Form 4637,420$541.8K2022-12-05
2023-04-05P, purchase reported on Form 4773,952$1.2M2023-04-06

Aclaris Therapeutics, Inc. (ACRS)

10% owner · 1 filing · 0 purchases and sales

No purchase or sale of common stock reported here; these filings cover grants, option exercises or other codes.

Disc Medicine, Inc. (GMTX)

Director, 10% owner · 1 filing · 0 purchases and sales

No purchase or sale of common stock reported here; these filings cover grants, option exercises or other codes.

Latigo Biotherapeutics, Inc. (LTGO)

Director, 10% owner · 1 filing · 1 purchase or sale
Trade dateCodeSharesValue as filedFiled
2026-08-10P, purchase reported on Form 4140,000$2.5M2026-08-10
Source

Counted from the Form 4 filings this reporting owner (SEC CIK 1581754) filed on EDGAR. Values are the transaction values as filed. See every filing on EDGAR, or browse insider buying and today's insider purchases.

Source: U.S. Securities and Exchange Commission (EDGAR) and other official government data · Updated 2026-10-12 · For informational purposes only, not investment advice.
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