Dark

ALT
Altimmune, Inc. Common Stock
stock NASDAQ

At Close

May 15, 2026 3:59:58 PM EDT

2.86USD-2.226%(-0.06)2,286,910

0.00Bid 0.00Ask 0.00Spread

Pre-market

May 15, 2026 9:26:30 AM EDT

2.91USD-0.514%(-0.02)4,353

After-hours

May 15, 2026 4:14:30 PM EDT

2.88USD+0.753%(+0.02)296,875

OverviewOptionsHistoricalExchange VolumeShortsMore

ALT Volume May 15, 2026

[NF]

Exchange	Day%	Volume	30D%
Off Exchange¹	57.36	1,311,682	53.15
Nasdaq GSM	24.77	566,479	22.27
NYSE Arca	4.83	110,408	7.91
IEX	4.42	101,043	5.04
Cboe EDGX	2.50	57,208	2.91
Cboe BZX	1.67	38,083	2.40
Cboe BYX	1.24	28,448	1.16
NYSE	0.89	20,431	1.32
MEMX	0.67	15,324	1.42
Cboe EDGA	0.64	14,587	0.43
NYSE National	0.43	9,914	0.95
MIAX Pearl	0.36	8,260	0.48
NYSE American	0.11	2,424	0.14
CHX	0.07	1,537	0.06
Nasdaq PHLX	0.03	618	0.10
Nasdaq BX	0.01	220	0.22
24X National	0.00	0	0.02
LTSE	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.

ALT Nutrition Facts

0.51 servings per container

Serving size

4.48M

Calories

2.29M

% Day

% Avg

Off Exchange¹ 1M

57.36%

53.15%

Nasdaq GSM 566K

24.77%

22.27%

NYSE Arca 110K

4.83%

7.91%

IEX 101K

4.42%

5.04%

Cboe EDGX 57K

2.50%

2.91%

Cboe BZX 38K

1.67%

2.40%

Cboe BYX 28K

1.24%

1.16%

NYSE 20K

0.89%

1.32%

MEMX 15K

0.67%

1.42%

Cboe EDGA 15K

0.64%

0.43%

NYSE National 10K

0.43%

0.95%

MIAX Pearl 8K

0.36%

0.48%

NYSE American 2K

0.11%

0.14%

CHX 2K

0.07%

0.06%

Nasdaq PHLX 618

0.03%

0.10%

Nasdaq BX 220

0.01%

0.22%

24X National 0

0.00%

0.02%

LTSE 0

0.00%

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

chartexchange.com

ALT Off Exchange & Dark Pool Summary

Today's Off Exchange & Dark Pool volume is 1,311,682, which is 57.36% of today's total volume.
Today's Lit volume is 974,984, which is 42.64%.
Over the past 30 days, the average Off Exchange & Dark Pool volume has been 53.15%.
The average Lit volume has been 46.85%.

ALT Volume by Exchange

Off Exchange

Nasdaq GSM

NYSE Arca

IEX

Cboe EDGX

Cboe BZX

Cboe BYX

NYSE

MEMX

Cboe EDGA

NYSE National