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Who

Natalie Sacks

Director

Company insider

Files Form 4 as: Director, Caribou Biosciences; Director, Zymeworks; Chief Medical Officer, Harpoon Therapeutics; Director, Zymeworks; Chief Medical Officer, Aduro Biotech.

Every Form 4 they filed

In numbers

Trades disclosed
85
Buys
0
Sells
23
Bought
$0
Sold
$1.4M
Companies
5
Companies where not an officer
3
First trade
12 Sep 2016
Last trade
20 Feb 2026
Last filed
20 Feb 2026

Companies traded

Where they are an officer
Harpoon TherapeuticsOfficer · last 28 Jan 20220 buys · 20 sells
Aduro BiotechOfficer · last 13 Sep 20180 buys · 3 sells
Everywhere else they filed: board seats, 10% stakes, other companies
CRBU Caribou BiosciencesDirector · Biotechnology · last 20 Feb 20260 buys · 0 sells
ZYME ZymeworksDirector · Biotechnology · last 21 Dec 20220 buys · 0 sells
ZymeworksDirector · last 6 May 20210 buys · 0 sells

Activity over time

1 Nov 2024 – 1 Oct 2026
101Nov 24May 25Nov 25Apr 26Oct 26

Buys above the line, sells below, each month.

Every trade

TradedCompanyWhatAmount
20 Feb 2026filed 20 Feb 2026CRBU Caribou Biosciencesoption or derivative · BiotechnologySEC FORM 4 Code A—45,000 at $0.00filing
20 Feb 2026filed 20 Feb 2026CRBU Caribou Biosciencesoption or derivative · BiotechnologySEC FORM 4 Code A—45,000 at $0.00filing
20 Feb 2025filed 21 Feb 2025CRBU Caribou Biosciencesoption or derivative · BiotechnologySEC FORM 4 Code A—40,500 at $0.00filing
20 Feb 2024filed 22 Feb 2024CRBU Caribou Biosciencesoption or derivative · BiotechnologySEC FORM 4 Code A—39,500 at $0.00filing
21 Feb 2023filed 23 Feb 2023CRBU Caribou Biosciencesoption or derivative · BiotechnologySEC FORM 4 Code A—21,500 at $0.00filing
21 Dec 2022filed 23 Dec 2022ZYME Zymeworksoption or derivative · BiotechnologySEC FORM 4 Code A—25,000 at $0.00filing
28 Jan 2022filed 1 Feb 2022Harpoon Therapeuticsoption or derivativeSEC FORM 4 Code A—155,000 at $0.00filing
20 Dec 2021filed 21 Dec 2021CRBU Caribou Biosciencesoption or derivative · BiotechnologySEC FORM 4 Code A—27,500 at $0.00filing
11 Nov 2021filed 15 Nov 2021Harpoon Therapeuticsoption or derivativeSEC FORM 4 Code A—155,000 at $0.00filing
6 May 2021filed 7 May 2021Zymeworksoption or derivativeSEC FORM 4 Code A—9,000 at $0.00filing
28 Jan 2021filed 29 Jan 2021Harpoon Therapeuticsoption or derivativeSEC FORM 4 Code A—80,000 at $0.00filing
18 May 2020filed 20 May 2020Harpoon Therapeuticsoption or derivativeSEC FORM 4 Code M—1,522 at $0.00filing
18 May 2020filed 20 May 2020Harpoon TherapeuticsSEC FORM 4 Code M$3,2271,522 at $2.12filing
18 May 2020filed 20 May 2020Harpoon TherapeuticsSEC FORM 4 Sold$22K1,522 at $14.77filing
8 May 2020filed 12 May 2020Zymeworksoption or derivativeSEC FORM 4 Code A—9,000 at $0.00filing
1 May 2020filed 5 May 2020Harpoon Therapeuticsoption or derivativeSEC FORM 4 Code M—5,826 at $0.00filing
1 May 2020filed 5 May 2020Harpoon TherapeuticsSEC FORM 4 Code M$12K5,826 at $2.12filing
1 May 2020filed 5 May 2020Harpoon TherapeuticsSEC FORM 4 Sold$70K5,826 at $12.07filing
17 Apr 2020filed 17 Apr 2020Harpoon Therapeuticsoption or derivativeSEC FORM 4 Code M—1,021 at $0.00filing
17 Apr 2020filed 17 Apr 2020Harpoon TherapeuticsSEC FORM 4 Code M$2,1651,021 at $2.12filing

News

No headline names them, or the companies they trade most, lately.

Sectors

Not placed23

Buys in green, sells in red, by the company’s sector.

Related people

Nobody else traded the same names lately.