Leigh Vosseller

CIK: 0001726322

Transaction Breakdown

Open Market Buys (P)1 (1.9%)

High conviction signal

Open Market Sales (S)0 (0.0%)

Position reduction

Option Exercises (M)23 (44.2%)

Derivative conversions

Awards (A)5 (9.6%)

Compensation grants

Other (G, F, J, C, D, …)23 (44.2%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

TNDM

TANDEM DIABETES CARE INC

Officer

Discretionary Trading P&L

Holdings

Transaction History (52 total)

TNDM
TANDEM DIABETES CARE INC
Aug 15, 2026
Exercise(M)
Direct
1.5K shares-
TNDM
TANDEM DIABETES CARE INC
Aug 15, 2026
Tax Payment(F)
Direct
942 shares at avg. $22.72$21K
TNDM
TANDEM DIABETES CARE INC
Aug 15, 2026
Tax Payment(F)
Direct
537 shares at avg. $22.72$12K
TNDM
TANDEM DIABETES CARE INC
Aug 15, 2026
Exercise(M)
Direct
2.6K shares-
TNDM
TANDEM DIABETES CARE INC
May 29, 2026
Award(A)
Restricted Stock Unit
Direct
62.7K shares-
TNDM
TANDEM DIABETES CARE INC
May 15, 2026
Tax Payment(F)
Direct
3.8K shares at avg. $12.82$48K
TNDM
TANDEM DIABETES CARE INC
May 15, 2026
Exercise(M)
Direct
10.5K shares-
TNDM
TANDEM DIABETES CARE INC
May 15, 2026
Tax Payment(F)
Direct
540 shares at avg. $12.82$7K
TNDM
TANDEM DIABETES CARE INC
May 15, 2026
Tax Payment(F)
Direct
537 shares at avg. $12.82$7K
TNDM
TANDEM DIABETES CARE INC
May 15, 2026
Exercise(M)
Direct
1.5K shares-
TNDM
TANDEM DIABETES CARE INC
May 15, 2026
Award(A)
Direct
1.3K shares at avg. $10.90$15K
TNDM
TANDEM DIABETES CARE INC
May 15, 2026
Exercise(M)
Direct
1.5K shares-
TNDM
TANDEM DIABETES CARE INC
Feb 17, 2026
Exercise(M)
Direct
1.5K shares-
TNDM
TANDEM DIABETES CARE INC
Feb 17, 2026
Tax Payment(F)
Direct
616 shares at avg. $18.95$12K
TNDM
TANDEM DIABETES CARE INC
Feb 17, 2026
Exercise(M)
Direct
1.5K shares-
TNDM
TANDEM DIABETES CARE INC
Feb 17, 2026
Tax Payment(F)
Direct
619 shares at avg. $18.95$12K
TNDM
TANDEM DIABETES CARE INC
Nov 17, 2025
Exercise(M)
Direct
1.5K shares-
TNDM
TANDEM DIABETES CARE INC
Nov 17, 2025
Exercise(M)
Direct
1.5K shares-
TNDM
TANDEM DIABETES CARE INC
Nov 17, 2025
Tax Payment(F)
Direct
536 shares at avg. $18.61$10K
TNDM
TANDEM DIABETES CARE INC
Nov 17, 2025
Tax Payment(F)
Direct
538 shares at avg. $18.61$10K
TNDM
TANDEM DIABETES CARE INC
Aug 15, 2025
Tax Payment(F)
Direct
538 shares at avg. $10.82$6K
TNDM
TANDEM DIABETES CARE INC
Aug 15, 2025
Exercise(M)
Direct
1.5K shares-
TNDM
TANDEM DIABETES CARE INC
Aug 15, 2025
Exercise(M)
Direct
1.5K shares-
TNDM
TANDEM DIABETES CARE INC
Aug 15, 2025
Tax Payment(F)
Direct
535 shares at avg. $10.82$6K
TNDM
TANDEM DIABETES CARE INC
Aug 8, 2025
Purchase(P)
Indirect
13.7K shares at avg. $10.89$149K

		Type	Shares	Price		Ownership
Aug 15, 2026	TNDM TANDEM DIABETES CARE INC	Exercise(M)	1,496	-	$0	Direct
Aug 15, 2026	TNDM TANDEM DIABETES CARE INC	Tax Payment(F)	942	$22.72	$21,402	Direct
Aug 15, 2026	TNDM TANDEM DIABETES CARE INC	Tax Payment(F)	537	$22.72	$12,201	Direct
Aug 15, 2026	TNDM TANDEM DIABETES CARE INC	Exercise(M)	2,624	-	$0	Direct
May 29, 2026	TNDM TANDEM DIABETES CARE INC	Award(A) Restricted Stock Unit	62,657	-	-	Direct
May 15, 2026	TNDM TANDEM DIABETES CARE INC	Tax Payment(F)	3,766	$12.82	$48,280	Direct
May 15, 2026	TNDM TANDEM DIABETES CARE INC	Exercise(M)	10,496	-	$0	Direct
May 15, 2026	TNDM TANDEM DIABETES CARE INC	Tax Payment(F)	540	$12.82	$6,923	Direct
May 15, 2026	TNDM TANDEM DIABETES CARE INC	Tax Payment(F)	537	$12.82	$6,884	Direct
May 15, 2026	TNDM TANDEM DIABETES CARE INC	Exercise(M)	1,496	-	$0	Direct
May 15, 2026	TNDM TANDEM DIABETES CARE INC	Award(A)	1,336	$10.90	$14,562	Direct
May 15, 2026	TNDM TANDEM DIABETES CARE INC	Exercise(M)	1,503	-	$0	Direct
Feb 17, 2026	TNDM TANDEM DIABETES CARE INC	Exercise(M)	1,495	-	$0	Direct
Feb 17, 2026	TNDM TANDEM DIABETES CARE INC	Tax Payment(F)	616	$18.95	$11,673	Direct
Feb 17, 2026	TNDM TANDEM DIABETES CARE INC	Exercise(M)	1,503	-	$0	Direct
Feb 17, 2026	TNDM TANDEM DIABETES CARE INC	Tax Payment(F)	619	$18.95	$11,730	Direct
Nov 17, 2025	TNDM TANDEM DIABETES CARE INC	Exercise(M)	1,503	-	-	Direct
Nov 17, 2025	TNDM TANDEM DIABETES CARE INC	Exercise(M)	1,496	-	-	Direct
Nov 17, 2025	TNDM TANDEM DIABETES CARE INC	Tax Payment(F)	536	$18.61	$9,975	Direct
Nov 17, 2025	TNDM TANDEM DIABETES CARE INC	Tax Payment(F)	538	$18.61	$10,012	Direct
Aug 15, 2025	TNDM TANDEM DIABETES CARE INC	Tax Payment(F)	538	$10.82	$5,821	Direct
Aug 15, 2025	TNDM TANDEM DIABETES CARE INC	Exercise(M)	1,503	-	-	Direct
Aug 15, 2025	TNDM TANDEM DIABETES CARE INC	Exercise(M)	1,495	-	-	Direct
Aug 15, 2025	TNDM TANDEM DIABETES CARE INC	Tax Payment(F)	535	$10.82	$5,789	Direct
Aug 8, 2025	TNDM TANDEM DIABETES CARE INC	Purchase(P)	13,720	$10.89	$149,404	Indirect

1-25 of 52 transactions

About Vosseller Leigh

Vosseller Leigh (SEC CIK 0001726322) files insider reports with the SEC as EVP & CHIEF FINANCIAL OFFICER of TANDEM DIABETES CARE INC (TNDM).

Signal8 holds 12 ownership filings by Vosseller Leigh, all Form 4s, filed between Nov 19, 2024 and Aug 18, 2026. Those filings report 52 transactions, from Nov 15, 2024 to Aug 15, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Vosseller Leigh's filings is in SAN DIEGO, CA.

Recent filings by Vosseller Leigh

Aug 15, 2026: Option exercise of TNDM shares (Form 4, code M).
Aug 15, 2026: Tax withholdings of TNDM shares (2 lines, Form 4, code F).
Aug 15, 2026: Option exercise of TNDM shares (Form 4, code M).
May 29, 2026: Grant or award of TNDM derivative securities (Form 4, code A).
May 15, 2026: Tax withholding of TNDM shares (Form 4, code F).

Other insiders filing for TANDEM DIABETES CARE INC (TNDM)

TWOMEY CHRISTOPHER J, Director
Kyrillos Jean-Claude, EVP & Chief Operating Officer
Sheridan John F, PRESIDENT & CEO
Morrison Susan, EVP & Chief Admin. Officer
Gasser Elizabeth Anne, EVP, Chief Strategy Officer
Carpenter Rick, EVP & Chief Technology Officer

How to read Form 4 transaction codes