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Who

Stephen W. Webster

Director

Company insider

Files Form 4 as: Director, NextCure; Director, Cullinan Therapeutics; Director, Eloxx Pharmaceuticals; Director, Gritstone bio; Director, Tcr2 Therapeutics; Director, Nabriva Therapeutics; Director, Viking Therapeutics; Chief Financial Officer, Spark Therapeutics.

In numbers

Trades disclosed
125
Buys
4
Sells
10
Bought
$155K
Sold
$4.7M
Companies
12
Companies where not an officer
9
First trade
27 Oct 2008
Last trade
18 Jun 2026
Last filed
22 Jun 2026

Companies traded

Where they are an officer
Spark TherapeuticsOfficer · last 17 Dec 20191 buy · 8 sells
Optimer PharmaceuticalsOfficer · last 24 Oct 20130 buys · 0 sells
AdolorOfficer · last 12 Dec 20111 buy · 0 sells
Everywhere else they filed: board seats, 10% stakes, other companies
NXTC NextCureDirector · Biotechnology · last 18 Jun 20260 buys · 0 sells
CGEM Cullinan TherapeuticsDirector · Biotechnology · last 16 Jun 20260 buys · 0 sells
ELOX Eloxx PharmaceuticalsDirector · Biotechnology · last 8 Jun 20260 buys · 0 sells
Gritstone bioDirector · last 4 Apr 20250 buys · 0 sells
Tcr2 TherapeuticsDirector · last 1 Jun 20230 buys · 0 sells
Nabriva TherapeuticsDirector · last 2 Aug 20221 buy · 2 sells
VKTX Viking TherapeuticsDirector · Biotechnology · last 2 Jan 20201 buy · 0 sells
Nabriva TherapeuticsDirector · last 23 Jun 20170 buys · 0 sells
HearusaDirector · last 10 Jun 20100 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
18 Jun 2026filed 22 Jun 2026NXTC NextCureoption or derivative · BiotechnologySEC FORM 4 Code A—2,340 at $0.00filing
18 Jun 2026filed 22 Jun 2026NXTC NextCureoption or derivative · BiotechnologySEC FORM 4 Code A—2,340 at $0.00filing
16 Jun 2026filed 18 Jun 2026CGEM Cullinan Therapeuticsoption or derivative · BiotechnologySEC FORM 4 Code A—25,319 at $0.00filing
16 Jun 2026filed 18 Jun 2026CGEM Cullinan Therapeuticsoption or derivative · BiotechnologySEC FORM 4 Code A—25,319 at $0.00filing
8 Jun 2026filed 10 Jun 2026ELOX Eloxx Pharmaceuticalsoption or derivative · BiotechnologySEC FORM 4 Code A—13,587 at $0.00filing
8 Jun 2026filed 10 Jun 2026ELOX Eloxx Pharmaceuticalsoption or derivative · BiotechnologySEC FORM 4 Code A—13,587 at $0.00filing
20 Jun 2025filed 24 Jun 2025NXTC NextCureoption or derivative · BiotechnologySEC FORM 4 Code A—18,700 at $0.00filing
12 Jun 2025filed 16 Jun 2025CGEM Cullinan Therapeuticsoption or derivative · BiotechnologySEC FORM 4 Code A—38,513 at $0.00filing
4 Apr 2025filed 8 Apr 2025Gritstone biooption or derivativeSEC FORM 4 Code J—103,600 at $0.00filing
4 Apr 2025filed 8 Apr 2025Gritstone biooption or derivativeSEC FORM 4 Code J—7,379 at $0.00filing
4 Apr 2025filed 8 Apr 2025Gritstone bioSEC FORM 4 Code J—25,000 at $0.00filing
26 Jun 2024filed 27 Jun 2024CGEM Cullinan Therapeuticsoption or derivative · BiotechnologySEC FORM 4 Code A—15,806 at $0.00filing
20 Jun 2024filed 21 Jun 2024NXTC NextCureoption or derivative · BiotechnologySEC FORM 4 Code A—18,700 at $0.00filing
17 Jun 2024filed 20 Jun 2024Gritstone biooption or derivativeSEC FORM 4 Code A—7,379 at $0.00filing
26 Apr 2024filed 30 Apr 2024Gritstone biooption or derivativeSEC FORM 4 Code A—103,600 at $0.00filing
22 Jun 2023filed 23 Jun 2023NXTC NextCureoption or derivative · BiotechnologySEC FORM 4 Code A—14,250 at $0.00filing
8 Jun 2023filed 12 Jun 2023CGEM Cullinan Therapeuticsoption or derivative · BiotechnologySEC FORM 4 Code A—18,450 at $0.00filing
1 Jun 2023filed 1 Jun 2023Tcr2 Therapeuticsoption or derivativeSEC FORM 4 Code D—16,800 at $0.00filing
1 Jun 2023filed 1 Jun 2023Tcr2 Therapeuticsoption or derivativeSEC FORM 4 Code D—12,100 at $0.00filing
1 Jun 2023filed 1 Jun 2023Tcr2 Therapeuticsoption or derivativeSEC FORM 4 Code D—12,100 at $0.00filing

Sectors

Health Care1
Not placed13

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

Related people

Brian LianPresident & CEO · Also traded VKTX in the last 90 days
Greg ZanteChief Financial Officer · Also traded VKTX in the last 90 days
Marianna ManciniChief Operating Officer · Also traded VKTX in the last 90 days