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ALT
Altimmune, Inc. Common Stock
stock NASDAQ

At Close

May 18, 2026 3:59:58 PM EDT

2.81USD-1.404%(-0.04)3,442,119

2.38Bid 3.19Ask 0.81Spread

Pre-market

May 18, 2026 9:19:30 AM EDT

2.87USD+0.702%(+0.02)18,930

After-hours

May 18, 2026 4:39:30 PM EDT

2.77USD-1.395%(-0.04)283,220

OverviewOptionsHistoricalDark Pool PrintsShortsMore

ALT Volume May 18, 2026

[NF]

Exchange	Day%	Volume	30D%
Off Exchange¹	55.35	1,911,521	53.26
Nasdaq GSM	22.37	772,431	22.24
IEX	6.33	218,451	5.09
NYSE Arca	5.28	182,399	7.81
Cboe EDGX	2.98	102,750	2.90
Cboe BZX	2.59	89,284	2.41
NYSE	1.37	47,188	1.32
MEMX	1.09	37,567	1.42
NYSE National	0.64	21,944	0.95
Cboe BYX	0.61	21,090	1.14
MIAX Pearl	0.53	18,198	0.46
Cboe EDGA	0.47	16,359	0.44
NYSE American	0.22	7,726	0.14
CHX	0.09	3,243	0.06
Nasdaq PHLX	0.04	1,427	0.10
Nasdaq BX	0.03	1,040	0.22
24X National	0.03	950	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

0.77 servings per container

Serving size

4.48M

Calories

3.45M

% Day

% Avg

Off Exchange¹ 2M

55.35%

53.26%

Nasdaq GSM 772K

22.37%

22.24%

IEX 218K

6.33%

5.09%

NYSE Arca 182K

5.28%

7.81%

Cboe EDGX 103K

2.98%

2.90%

Cboe BZX 89K

2.59%

2.41%

NYSE 47K

1.37%

1.32%

MEMX 38K

1.09%

1.42%

NYSE National 22K

0.64%

0.95%

Cboe BYX 21K

0.61%

1.14%

MIAX Pearl 18K

0.53%

0.46%

Cboe EDGA 16K

0.47%

0.44%

NYSE American 8K

0.22%

0.14%

CHX 3K

0.09%

0.06%

Nasdaq PHLX 1K

0.04%

0.10%

Nasdaq BX 1K

0.03%

0.22%

24X National 950

0.03%

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 1,911,521, which is 55.35% of today's total volume.
Today's Lit volume is 1,542,047, which is 44.65%.
Over the past 30 days, the average Off Exchange & Dark Pool volume has been 53.26%.
The average Lit volume has been 46.74%.

ALT Volume by Exchange

Off Exchange

Nasdaq GSM

IEX

NYSE Arca

Cboe EDGX

Cboe BZX

NYSE

MEMX

NYSE National

Cboe BYX

MIAX Pearl