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Who

J. Matthew Singleton

Director

Company insider

Files Form 4 as: Director, Viking Therapeutics; Director, Cubist Pharmaceuticals.

In numbers

Trades disclosed
77
Buys
1
Sells
13
Bought
$93K
Sold
$6.9M
Companies
2
Companies where not an officer
2
First trade
8 Jun 2006
Last trade
2 Jan 2026
Last filed
5 Jan 2026

Companies traded

Everywhere else they filed: board seats, 10% stakes, other companies
VKTX Viking TherapeuticsDirector · Biotechnology · last 2 Jan 20261 buy · 5 sells
Cubist PharmaceuticalsDirector · last 12 Jun 20130 buys · 8 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
2 Jan 2026filed 5 Jan 2026VKTX Viking TherapeuticsBiotechnologySEC FORM 4 Code A—3,150 at $0.00filing
2 Jan 2026filed 5 Jan 2026VKTX Viking Therapeuticsoption or derivative · BiotechnologySEC FORM 4 Code A—20,400 at $0.00filing
2 Jan 2026filed 5 Jan 2026VKTX Viking Therapeuticsoption or derivative · BiotechnologySEC FORM 4 Code A—20,400 at $0.00filing
2 Jan 2026filed 5 Jan 2026VKTX Viking TherapeuticsBiotechnologySEC FORM 4 Code A—3,150 at $0.00filing
2 Jan 2025filed 6 Jan 2025VKTX Viking Therapeuticsoption or derivative · BiotechnologySEC FORM 4 Code A—18,800 at $0.00filing
25 Oct 2024filed 25 Oct 2024VKTX Viking Therapeuticsoption or derivative · BiotechnologySEC FORM 4 Code M—16,000 at $0.00filing
25 Oct 2024filed 25 Oct 2024VKTX Viking TherapeuticsBiotechnologySEC FORM 4 Code M$72K16,000 at $4.48filing
25 Oct 2024filed 25 Oct 2024VKTX Viking TherapeuticsBiotechnologySEC FORM 4 Sold$1.3M16,000 at $79.50filing
20 Sep 2024filed 20 Sep 2024VKTX Viking Therapeuticsoption or derivative · BiotechnologySEC FORM 4 Code M—10,300 at $0.00filing
20 Sep 2024filed 20 Sep 2024VKTX Viking TherapeuticsBiotechnologySEC FORM 4 Code M$12K10,300 at $1.19filing
20 Sep 2024filed 20 Sep 2024VKTX Viking TherapeuticsBiotechnologySEC FORM 4 Sold$716K10,300 at $69.50filing
21 Aug 2024filed 22 Aug 2024VKTX Viking Therapeuticsoption or derivative · BiotechnologySEC FORM 4 Code M—5,700 at $0.00filing
21 Aug 2024filed 22 Aug 2024VKTX Viking TherapeuticsBiotechnologySEC FORM 4 Code M$6,7835,700 at $1.19filing
21 Aug 2024filed 22 Aug 2024VKTX Viking TherapeuticsBiotechnologySEC FORM 4 Sold$397K5,700 at $69.72filing
19 Aug 2024filed 19 Aug 2024VKTX Viking Therapeuticsoption or derivative · BiotechnologySEC FORM 4 Code M—16,000 at $0.00filing
19 Aug 2024filed 19 Aug 2024VKTX Viking TherapeuticsBiotechnologySEC FORM 4 Code M$53K16,000 at $3.33filing
19 Aug 2024filed 19 Aug 2024VKTX Viking TherapeuticsBiotechnologySEC FORM 4 Sold$150K2,500 at $60.01filing
19 Aug 2024filed 19 Aug 2024VKTX Viking TherapeuticsBiotechnologySEC FORM 4 Sold$186K3,047 at $61.13filing
19 Aug 2024filed 19 Aug 2024VKTX Viking TherapeuticsBiotechnologySEC FORM 4 Sold$279K4,509 at $61.86filing
19 Aug 2024filed 19 Aug 2024VKTX Viking TherapeuticsBiotechnologySEC FORM 4 Sold$130K2,055 at $63.15filing

Sectors

Health Care6
Not placed8

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

Related people

Dorothy Elizabeth Kelly-GemmellDirector · Director at Viking Therapeutics, filing Form 4 there in the last year
Brian LianPresident & CEO · President & CEO at Viking Therapeutics, filing Form 4 there in the last year
Greg ZanteChief Financial Officer · Chief Financial Officer at Viking Therapeutics, filing Form 4 there in the last year
Marianna ManciniChief Operating Officer · Chief Operating Officer at Viking Therapeutics, filing Form 4 there in the last year
Hubert C. ChenChief Medical Officer · Chief Medical Officer at Viking Therapeutics, filing Form 4 there in the last year