Dark

TNDM
Tandem Diabetes Care, Inc.
stock NASDAQ

At Close

Sep 30, 2026 3:59:53 PM EDT

16.31USD-1.569%(-0.26)2,198,738

14.06Bid 18.72Ask 4.66Spread

Pre-market

Sep 30, 2026 9:28:30 AM EDT

16.62USD+0.302%(+0.05)13,572

After-hours

Sep 29, 2026 4:36:30 PM EDT

16.60USD+0.121%(+0.02)0

OverviewOptionsHistoricalDark Pool LevelsShortsMore

TNDM Volume Sep 30, 2026

[NF]

Exchange	Day%	Volume	30D%
Off Exchange¹	42.93	942,773	45.17
Nasdaq GSM	33.59	737,649	31.20
NYSE Arca	5.38	118,071	5.22
IEX	5.27	115,645	6.55
Cboe BZX	4.15	91,164	3.93
Cboe EDGX	2.83	62,244	2.51
NYSE	1.38	30,269	1.46
Cboe BYX	1.27	27,928	0.93
Cboe EDGA	0.80	17,476	0.75
MEMX	0.70	15,394	0.79
Texas Stock Exchange LLC	0.48	10,480	0.33
MIAX Pearl	0.30	6,697	0.24
Nasdaq BX	0.30	6,564	0.24
NYSE National	0.23	5,115	0.21
Nasdaq PHLX	0.16	3,489	0.16
NYSE American	0.12	2,573	0.12
CHX	0.09	2,081	0.12
24X National	0.03	601	0.02
LTSE	0.00	0	0.05

chartexchange.com

¹ A) Dark Pool or Off Exchange? B) Venues explained. C) All trades that update volume from the CTA.

TNDM Nutrition Facts

1.15 servings per container

Serving size

1.90M

Calories

2.20M

% Day

% Avg

Off Exchange¹ 943K

42.93%

45.17%

Nasdaq GSM 738K

33.59%

31.20%

NYSE Arca 118K

5.38%

5.22%

IEX 116K

5.27%

6.55%

Cboe BZX 91K

4.15%

3.93%

Cboe EDGX 62K

2.83%

2.51%

NYSE 30K

1.38%

1.46%

Cboe BYX 28K

1.27%

0.93%

Cboe EDGA 17K

0.80%

0.75%

MEMX 15K

0.70%

0.79%

Texas Stock Exchange LLC 10K

0.48%

0.33%

MIAX Pearl 7K

0.30%

0.24%

Nasdaq BX 7K

0.30%

0.24%

NYSE National 5K

0.23%

0.21%

Nasdaq PHLX 3K

0.16%

NYSE American 3K

0.12%

CHX 2K

0.09%

0.12%

24X National 601

0.03%

0.02%

LTSE 0

0.00%

0.05%

¹ A) Dark Pool or Off Exchange? B) Venues explained. C) All trades that update volume from the CTA.

chartexchange.com

TNDM Off Exchange & Dark Pool Summary

Today's Off Exchange & Dark Pool volume is 942,773, which is 42.93% of today's total volume.
Today's Lit volume is 1,253,440, which is 57.07%.
Over the past 30 days, the average Off Exchange & Dark Pool volume has been 45.17%.
The average Lit volume has been 54.83%.

TNDM Volume by Exchange

Off Exchange

Nasdaq GSM

NYSE Arca

IEX

Cboe BZX

Cboe EDGX

NYSE

Cboe BYX

Cboe EDGA

MEMX

Texas Stock Exchange LLC