Dark

WTM
White Mountains Insurance Group Ltd.
stock NYSE

At Close

Sep 21, 2026 3:59:50 PM EDT

2051.18USD-0.491%(-10.12)17,867

1933.25Bid 2173.50Ask 240.25Spread

Pre-market

Sep 21, 2026 9:14:30 AM EDT

2071.20USD+0.480%(+9.90)200

After-hours

Sep 21, 2026 4:42:30 PM EDT

2051.40USD+0.011%(+0.22)363

OverviewHistoricalDark Pool LevelsShortsMore

WTM Volume Sep 21, 2026

[NF]

Exchange	Day%	Volume	30D%
Off Exchange¹	35.58	6,246	38.66
NYSE	32.57	5,718	28.60
NYSE Arca	9.69	1,701	7.66
Nasdaq GSM	8.16	1,432	7.02
IEX	4.73	830	5.05
Cboe BZX	2.45	431	3.05
Cboe EDGX	1.75	307	4.46
MEMX	1.72	302	1.69
Cboe BYX	1.34	235	1.11
NYSE National	0.54	95	0.63
NYSE American	0.47	83	0.19
Nasdaq BX	0.44	77	0.71
MIAX Pearl	0.31	54	0.61
CHX	0.24	43	0.20
Cboe EDGA	0.02	3	0.26
Nasdaq PHLX	0.00	0	0.10
24X National	0.00	0	0.00
Texas Stock Exchange LLC	0.00	0	0.00

chartexchange.com

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

WTM Nutrition Facts

0.77 servings per container

Serving size

22.92K

Calories

17.56K

% Day

% Avg

Off Exchange¹ 6K

35.58%

38.66%

NYSE 6K

32.57%

28.60%

NYSE Arca 2K

9.69%

7.66%

Nasdaq GSM 1K

8.16%

7.02%

IEX 830

4.73%

5.05%

Cboe BZX 431

2.45%

3.05%

Cboe EDGX 307

1.75%

4.46%

MEMX 302

1.72%

1.69%

Cboe BYX 235

1.34%

1.11%

NYSE National 95

0.54%

0.63%

NYSE American 83

0.47%

0.19%

Nasdaq BX 77

0.44%

0.71%

MIAX Pearl 54

0.31%

0.61%

CHX 43

0.24%

0.20%

Cboe EDGA 3

0.02%

0.26%

Nasdaq PHLX 0

0.00%

0.10%

24X National 0

0.00%

Texas Stock Exchange LLC 0

0.00%

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

chartexchange.com

WTM Off Exchange & Dark Pool Summary

Today's Off Exchange & Dark Pool volume is 6,246, which is 35.58% of today's total volume.
Today's Lit volume is 11,311, which is 64.42%.
Over the past 30 days, the average Off Exchange & Dark Pool volume has been 38.66%.
The average Lit volume has been 61.34%.

WTM Volume by Exchange

Off Exchange

NYSE

NYSE Arca

Nasdaq GSM

IEX

Cboe BZX

Cboe EDGX

MEMX

Cboe BYX

NYSE National

NYSE American