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ATEC
Alphatec Holdings, Inc.
stock NASDAQ

At Close

May 18, 2026 3:59:59 PM EDT

8.09USD+5.614%(+0.43)3,459,847

8.02Bid 8.15Ask 0.13Spread

Pre-market

May 18, 2026 8:28:30 AM EDT

7.50USD-2.089%(-0.16)1,500

After-hours

May 18, 2026 4:31:30 PM EDT

8.12USD+0.371%(+0.03)337,867

OverviewOptionsHistoricalDark Pool PrintsShortsMore

ATEC Volume May 18, 2026

[NF]

Exchange	Day%	Volume	30D%
Off Exchange¹	49.98	1,718,873	46.29
Nasdaq GSM	28.67	985,989	28.40
NYSE Arca	6.52	224,394	6.99
IEX	5.67	195,079	6.04
Cboe BZX	2.98	102,651	3.39
NYSE	1.78	61,275	2.04
Cboe EDGX	1.78	61,143	2.53
MEMX	1.17	40,289	1.26
Cboe EDGA	0.41	14,146	0.54
MIAX Pearl	0.38	12,920	0.59
Cboe BYX	0.26	9,031	0.86
NYSE National	0.13	4,496	0.53
NYSE American	0.11	3,776	0.08
Nasdaq BX	0.06	1,969	0.25
Nasdaq PHLX	0.05	1,737	0.10
CHX	0.04	1,524	0.09
LTSE	0.00	125	0.01
24X National	0.00	0	0.02

chartexchange.com

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

ATEC Nutrition Facts

0.85 servings per container

Serving size

4.05M

Calories

3.44M

% Day

% Avg

Off Exchange¹ 2M

49.98%

46.29%

Nasdaq GSM 986K

28.67%

28.40%

NYSE Arca 224K

6.52%

6.99%

IEX 195K

5.67%

6.04%

Cboe BZX 103K

2.98%

3.39%

NYSE 61K

1.78%

2.04%

Cboe EDGX 61K

1.78%

2.53%

MEMX 40K

1.17%

1.26%

Cboe EDGA 14K

0.41%

0.54%

MIAX Pearl 13K

0.38%

0.59%

Cboe BYX 9K

0.26%

0.86%

NYSE National 4K

0.13%

0.53%

NYSE American 4K

0.11%

0.08%

Nasdaq BX 2K

0.06%

0.25%

Nasdaq PHLX 2K

0.05%

0.10%

CHX 2K

0.04%

0.09%

LTSE 125

0.00%

0.01%

24X National 0

0.00%

0.02%

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

chartexchange.com

ATEC Off Exchange & Dark Pool Summary

Today's Off Exchange & Dark Pool volume is 1,718,873, which is 49.98% of today's total volume.
Today's Lit volume is 1,720,544, which is 50.02%.
Over the past 30 days, the average Off Exchange & Dark Pool volume has been 46.29%.
The average Lit volume has been 53.71%.

ATEC Volume by Exchange

Off Exchange

Nasdaq GSM

NYSE Arca

IEX

Cboe BZX

NYSE

Cboe EDGX

MEMX

Cboe EDGA

MIAX Pearl

Cboe BYX