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Who

Christopher Y. Chai

Director

Company insider

Files Form 4 as: Director, Surrozen; Chief Financial Officer, Principia Biopharma; SVP, Chief Financial Officer, MAP Pharmaceuticals.

Every Form 4 they filed

In numbers

Trades disclosed
99
Buys
0
Sells
13
Bought
$0
Sold
$3.3M
Companies
3
Companies where not an officer
1
First trade
22 Jan 2008
Last trade
13 May 2026
Last filed
14 May 2026

Companies traded

Where they are an officer
Principia BiopharmaOfficer · last 28 Sep 20200 buys · 3 sells
MAP PharmaceuticalsOfficer · last 1 Mar 20130 buys · 10 sells
Everywhere else they filed: board seats, 10% stakes, other companies
SRZN SurrozenDirector · Biotechnology · last 13 May 20260 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
13 May 2026filed 14 May 2026SRZN Surrozenoption or derivative · BiotechnologySEC FORM 4 Code A—5,550 at $0.00filing
13 May 2026filed 14 May 2026SRZN Surrozenoption or derivative · BiotechnologySEC FORM 4 Code A—5,550 at $0.00filing
14 May 2025filed 15 May 2025SRZN Surrozenoption or derivative · BiotechnologySEC FORM 4 Code A—1,333 at $0.00filing
5 Jun 2024filed 6 Jun 2024SRZN Surrozenoption or derivative · BiotechnologySEC FORM 4 Code A—1,333 at $0.00filing
18 May 2023filed 19 May 2023SRZN Surrozenoption or derivative · BiotechnologySEC FORM 4 Code A—20,000 at $0.00filing
7 Jun 2022filed 9 Jun 2022SRZN Surrozenoption or derivative · BiotechnologySEC FORM 4 Code A—20,000 at $0.00filing
28 Sep 2020filed 28 Sep 2020Principia Biopharmaoption or derivativeSEC FORM 4 Code D—56,982filing
28 Sep 2020filed 28 Sep 2020Principia Biopharmaoption or derivativeSEC FORM 4 Code D—24,769filing
28 Sep 2020filed 28 Sep 2020Principia Biopharmaoption or derivativeSEC FORM 4 Code D—29,723filing
28 Sep 2020filed 28 Sep 2020Principia Biopharmaoption or derivativeSEC FORM 4 Code D—13,210filing
28 Sep 2020filed 28 Sep 2020Principia Biopharmaoption or derivativeSEC FORM 4 Code D—34,677filing
28 Sep 2020filed 28 Sep 2020Principia Biopharmaoption or derivativeSEC FORM 4 Code D—44,034filing
28 Sep 2020filed 28 Sep 2020Principia Biopharmaoption or derivativeSEC FORM 4 Code D—60,000filing
28 Sep 2020filed 28 Sep 2020Principia Biopharmaoption or derivativeSEC FORM 4 Code D—55,000filing
28 Sep 2020filed 28 Sep 2020Principia BiopharmaSEC FORM 4 Code U$380K3,799 at $100.00filing
28 Sep 2020filed 28 Sep 2020Principia BiopharmaSEC FORM 4 Code U$330K3,302 at $100.00filing
18 Aug 2020filed 20 Aug 2020Principia Biopharmaoption or derivativeSEC FORM 4 Code M—7,500 at $0.00filing
18 Aug 2020filed 20 Aug 2020Principia BiopharmaSEC FORM 4 Code M$23K7,500 at $3.00filing
18 Aug 2020filed 20 Aug 2020Principia BiopharmaSEC FORM 4 Sold$745K7,500 at $99.37filing
19 May 2020filed 21 May 2020Principia Biopharmaoption or derivativeSEC FORM 4 Code M—5,675 at $0.00filing

News

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

Sectors

Not placed13

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

Related people

Nobody else traded the same names lately.