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$VSTM

$3.66 +$0.04 (1.1%)

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Valuations P Insider Transactions P Congressional Trades P

Insider Transactions

Insider Transaction Summary

CAPITAL MANAGEMENT, L.P. RA

16,142,051 shares

Net: 0 B/S: -

Capital Investments L.P. Ridgeback

10,068,243 shares

Net: 0 B/S: -

Christoph H Westphal

665,224 shares

Net: 0 B/S: -

Dan Paterson

612,919 shares

Net: +152,937 B/S: 3.51

Robert Forrester

240,000 shares

Net: 0 B/S: -

Michael Kauffman

200,000 shares

Net: +191,450 B/S: 23.39

Gregory Berk

150,000 shares

Net: 0 B/S: -

Frank Neumann

150,000 shares

Net: 0 B/S: -

Daniel Calkins

121,327 shares

Net: +7,272 B/S: 1.78

Brian M Stuglik

101,147 shares

Net: -1,773 B/S: -

Lesley Kim Solomon

62,500 shares

Net: 0 B/S: -

Joseph M Lobacki

62,500 shares

Net: 0 B/S: -

Joseph Chiapponi

60,000 shares

Net: 0 B/S: -

Matthew Ros

50,000 shares

Net: 0 B/S: -

Robert E. Gagnon

41,678 shares

Net: -848 B/S: -

Steven H. Bloom

40,000 shares

Net: 0 B/S: -

S. Louise Phanstiel

25,000 shares

Net: 0 B/S: -

PAUL A FRIEDMAN

25,000 shares

Net: 0 B/S: -

Gina Consylman

25,000 shares

Net: 0 B/S: -

TIMOTHY J BARBERICH

25,000 shares

Net: 0 B/S: -

Alison Frances Lawton

25,000 shares

Net: 0 B/S: -

Bruce Wendel

25,000 shares

Net: 0 B/S: -

JOHN B GREEN

23,760 shares

Net: 0 B/S: -

MICHELLE ROBERTSON

16,666 shares

Net: 0 B/S: -

Anil Kapur

16,666 shares

Net: 0 B/S: -

Karin Anna Tollefson

16,666 shares

Net: 0 B/S: -

Eric K Rowinsky

16,666 shares

Net: 0 B/S: -

JOHN JOHNSON

16,666 shares

Net: 0 B/S: -

Julie B Feder

5,000 shares

Net: 0 B/S: -

NgocDiep T. MD, PhD Le

2,500 shares

Net: 0 B/S: -

Paul A. Bunn

2,083 shares

Net: -8,333 B/S: 0.43

Monica Singh

2,000 shares

Net: 0 B/S: -

Insider Name	Current Shares	Net Change (1yr)	Buy/Sell Ratio
CAPITAL MANAGEMENT, L.P. RA	16,142,051	0	-
Capital Investments L.P. Ridgeback	10,068,243	0	-
Christoph H Westphal	665,224	0	-
Dan Paterson	612,919	+152,937	3.51
Robert Forrester	240,000	0	-
Michael Kauffman	200,000	+191,450	23.39
Gregory Berk	150,000	0	-
Frank Neumann	150,000	0	-
Daniel Calkins	121,327	+7,272	1.78
Brian M Stuglik	101,147	-1,773	-
Lesley Kim Solomon	62,500	0	-
Joseph M Lobacki	62,500	0	-
Joseph Chiapponi	60,000	0	-
Matthew Ros	50,000	0	-
Robert E. Gagnon	41,678	-848	-
Steven H. Bloom	40,000	0	-
S. Louise Phanstiel	25,000	0	-
PAUL A FRIEDMAN	25,000	0	-
Gina Consylman	25,000	0	-
TIMOTHY J BARBERICH	25,000	0	-
Alison Frances Lawton	25,000	0	-
Bruce Wendel	25,000	0	-
JOHN B GREEN	23,760	0	-
MICHELLE ROBERTSON	16,666	0	-
Anil Kapur	16,666	0	-
Karin Anna Tollefson	16,666	0	-
Eric K Rowinsky	16,666	0	-
JOHN JOHNSON	16,666	0	-
Julie B Feder	5,000	0	-
NgocDiep T. MD, PhD Le	2,500	0	-
Paul A. Bunn	2,083	-8,333	0.43
Monica Singh	2,000	0	-

Individual Transactions

March 20, 2026

Daniel Calkins

Grant/Award Acquisition

Change: -57

Price: $5.74

Shares: 121,327

Value: -$327

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Daniel Calkins	Mar 23	Grant/Award Acquisition (A) Compensation/Award	121,327	-57	$5.74	-$327

February 04, 2026

Dan Paterson

Open Market Sale

Change: -970

Price: $6.69

Shares: 612,919

Value: -$6,489

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Dan Paterson	Feb 05	Open Market Sale (S) Market Sale	612,919	-970	$6.69	-$6,489

January 21, 2026

Daniel Calkins

Grant/Award Acquisition

Change: +16,665

Price: $0.00

Shares: 121,384

Value: +$0

Dan Paterson

Grant/Award Acquisition

Change: +213,785

Price: $0.00

Shares: 613,889

Value: +$0

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Daniel Calkins	Jan 23	Grant/Award Acquisition (A) Compensation/Award	121,384	+16,665	$0.00	+$0
Dan Paterson	Jan 23	Grant/Award Acquisition (A) Compensation/Award	613,889	+213,785	$0.00	+$0

January 12, 2026

Dan Paterson

Open Market Sale

Change: -10,321

Price: $7.16

Shares: 400,104

Value: -$73,898

Daniel Calkins

Open Market Sale

Change: -5,039

Price: $7.16

Shares: 104,719

Value: -$36,079

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Dan Paterson	Jan 14	Open Market Sale (S) Market Sale	400,104	-10,321	$7.16	-$73,898
Daniel Calkins	Jan 14	Open Market Sale (S) Market Sale	104,719	-5,039	$7.16	-$36,079

January 06, 2026

Michael Kauffman

Grant/Award Acquisition

Change: +200,000

Price: $0.00

Shares: 200,000

Value: +$0

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Michael Kauffman	Jan 08	Grant/Award Acquisition (A) Compensation/Award	200,000	+200,000	$0.00	+$0

December 24, 2025

Daniel Calkins

Open Market Sale

Change: -80

Price: $7.86

Shares: 109,758

Value: -$628

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Daniel Calkins	Dec 29	Open Market Sale (S) Market Sale	109,758	-80	$7.86	-$628

December 16, 2025

Brian M Stuglik

Open Market Sale

Change: -592

Price: $9.14

Shares: 101,147

Value: -$5,410

Dan Paterson

Open Market Sale

Change: -393

Price: $9.14

Shares: 410,425

Value: -$3,592

Robert E. Gagnon

Open Market Sale

Change: -283

Price: $9.14

Shares: 41,678

Value: -$2,586

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Brian M Stuglik	Dec 18	Open Market Sale (S) Market Sale	101,147	-592	$9.14	-$5,410
Dan Paterson	Dec 18	Open Market Sale (S) Market Sale	410,425	-393	$9.14	-$3,592
Robert E. Gagnon	Dec 18	Open Market Sale (S) Market Sale	41,678	-283	$9.14	-$2,586

December 11, 2025

Dan Paterson

Open Market Sale

Change: -2,000

Price: $10.00

Shares: 410,818

Value: -$20,000

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Dan Paterson	Dec 12	Open Market Sale (S) Market Sale	410,818	-2,000	$10.00	-$20,000

December 10, 2025

Dan Paterson

Open Market Sale

Change: -2,000

Price: $10.07

Shares: 412,818

Value: -$20,140

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Dan Paterson	Dec 12	Open Market Sale (S) Market Sale	412,818	-2,000	$10.07	-$20,140

December 09, 2025

Dan Paterson

Open Market Sale

Change: -2,000

Price: $10.25

Shares: 414,818

Value: -$20,500

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Dan Paterson	Dec 09	Open Market Sale (S) Market Sale	414,818	-2,000	$10.25	-$20,500

December 08, 2025

Dan Paterson

Open Market Sale

Change: -2,000

Price: $10.50

Shares: 416,818

Value: -$21,000

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Dan Paterson	Dec 09	Open Market Sale (S) Market Sale	416,818	-2,000	$10.50	-$21,000

December 05, 2025

Dan Paterson

Open Market Sale

Change: -2,000

Price: $10.61

Shares: 418,818

Value: -$21,220

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Dan Paterson	Dec 09	Open Market Sale (S) Market Sale	418,818	-2,000	$10.61	-$21,220

December 04, 2025

Dan Paterson

Open Market Sale

Change: -2,000

Price: $10.00

Shares: 420,818

Value: -$20,000

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Dan Paterson	Dec 04	Open Market Sale (S) Market Sale	420,818	-2,000	$10.00	-$20,000

December 03, 2025

Dan Paterson

Open Market Sale

Change: -2,000

Price: $10.00

Shares: 422,818

Value: -$20,000

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Dan Paterson	Dec 04	Open Market Sale (S) Market Sale	422,818	-2,000	$10.00	-$20,000

December 02, 2025

Dan Paterson

Open Market Sale

Change: -2,000

Price: $10.32

Shares: 424,818

Value: -$20,640

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Dan Paterson	Dec 04	Open Market Sale (S) Market Sale	424,818	-2,000	$10.32	-$20,640

December 01, 2025

Dan Paterson

Open Market Sale

Change: -2,000

Price: $10.39

Shares: 426,818

Value: -$20,780

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Dan Paterson	Dec 01	Open Market Sale (S) Market Sale	426,818	-2,000	$10.39	-$20,780