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Who

Ronald W. Barrett

Director

Company insider

Files Form 4 as: Director, Janux Therapeutics; Director, Concert Pharmaceuticals; Chief Executive Officer, Xenoport.

Every Form 4 they filed

In numbers

Trades disclosed
1,143
Buys
3
Sells
50
Bought
$80K
Sold
$6.2M
Companies
3
Companies where not an officer
2
First trade
16 Nov 2005
Last trade
11 Jun 2026
Last filed
12 Jun 2026

Companies traded

Where they are an officer
XenoportDirector, Officer · last 1 Sep 20153 buys · 48 sells
Everywhere else they filed: board seats, 10% stakes, other companies
JANX Janux TherapeuticsDirector · Biotechnology · last 11 Jun 20260 buys · 0 sells
Concert PharmaceuticalsDirector · last 10 Jun 20210 buys · 2 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
11 Jun 2026filed 12 Jun 2026JANX Janux TherapeuticsBiotechnologySEC FORM 4 Code A—5,500 at $0.00filing
11 Jun 2026filed 12 Jun 2026JANX Janux Therapeuticsoption or derivative · BiotechnologySEC FORM 4 Code A—15,500 at $0.00filing
11 Jun 2026filed 12 Jun 2026JANX Janux Therapeuticsoption or derivative · BiotechnologySEC FORM 4 Code A—15,500 at $0.00filing
11 Jun 2026filed 12 Jun 2026JANX Janux TherapeuticsBiotechnologySEC FORM 4 Code A—5,500 at $0.00filing
11 Jun 2025filed 13 Jun 2025JANX Janux Therapeuticsoption or derivative · BiotechnologySEC FORM 4 Code A—11,667 at $0.00filing
11 Jun 2025filed 13 Jun 2025JANX Janux TherapeuticsBiotechnologySEC FORM 4 Code A—3,750 at $0.00filing
26 Jun 2024filed 28 Jun 2024JANX Janux Therapeuticsoption or derivative · BiotechnologySEC FORM 4 Code A—8,350 at $0.00filing
26 Jun 2024filed 28 Jun 2024JANX Janux TherapeuticsBiotechnologySEC FORM 4 Code A—2,500 at $0.00filing
14 Jun 2023filed 16 Jun 2023JANX Janux Therapeuticsoption or derivative · BiotechnologySEC FORM 4 Code A—12,500 at $0.00filing
14 Jun 2022filed 16 Jun 2022JANX Janux Therapeuticsoption or derivative · BiotechnologySEC FORM 4 Code A—12,500 at $0.00filing
7 Sep 2021filed 9 Sep 2021JANX Janux Therapeuticsoption or derivative · BiotechnologySEC FORM 4 Code A—30,000 at $0.00filing
10 Jun 2021filed 11 Jun 2021Concert PharmaceuticalsSEC FORM 4 Code A—5,125filing
10 Jun 2021filed 11 Jun 2021Concert Pharmaceuticalsoption or derivativeSEC FORM 4 Code A—10,250 at $0.00filing
11 Jun 2020filed 12 Jun 2020Concert Pharmaceuticalsoption or derivativeSEC FORM 4 Code A—10,000 at $0.00filing
13 Jun 2019filed 17 Jun 2019Concert Pharmaceuticalsoption or derivativeSEC FORM 4 Code A—10,000 at $0.00filing
14 Jun 2018filed 18 Jun 2018Concert Pharmaceuticalsoption or derivativeSEC FORM 4 Code A—10,000 at $0.00filing
4 Dec 2017filed 6 Dec 2017Concert PharmaceuticalsSEC FORM 4 Code M$16K3,539 at $4.41filing
4 Dec 2017filed 6 Dec 2017Concert PharmaceuticalsSEC FORM 4 Code M$13K3,539 at $3.79filing
4 Dec 2017filed 6 Dec 2017Concert PharmaceuticalsSEC FORM 4 Code M$12K3,539 at $3.50filing
4 Dec 2017filed 6 Dec 2017Concert PharmaceuticalsSEC FORM 4 Code M$10K3,539 at $2.88filing

The newest 500 lines are listed; the numbers count every line.

News

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

Sectors

Not placed53

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

Related people

Nobody else traded the same names lately.