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ALT
Altimmune, Inc. Common Stock
stock NASDAQ

At Close

Apr 28, 2026 3:59:52 PM EDT

2.72USD-2.857%(-0.08)4,837,742

2.34Bid 2.73Ask 0.39Spread

Pre-market

Apr 28, 2026 9:26:30 AM EDT

2.78USD-0.714%(-0.02)20,151

After-hours

Apr 28, 2026 4:57:30 PM EDT

2.77USD+1.812%(+0.05)16,826

OverviewOptionsHistoricalExchange VolumeShortsMore

ALT Volume Apr 28, 2026

[NF]

Exchange	Day%	Volume	30D%
Off Exchange¹	48.17	2,346,397	50.44
Nasdaq GSM	26.17	1,274,657	26.36
IEX	5.56	270,600	4.94
NYSE Arca	5.22	254,277	7.44
Cboe EDGX	3.07	149,483	2.88
NYSE National	2.45	119,415	0.79
Cboe BYX	2.12	103,191	0.89
Cboe BZX	2.04	99,401	2.10
Cboe EDGA	1.40	68,236	0.33
MEMX	1.40	67,981	1.40
NYSE	1.02	49,668	1.42
Nasdaq BX	0.49	23,964	0.21
MIAX Pearl	0.36	17,667	0.50
Nasdaq PHLX	0.26	12,584	0.10
NYSE American	0.21	10,464	0.10
CHX	0.05	2,237	0.07
24X National	0.01	368	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

1.10 servings per container

Serving size

4.41M

Calories

4.87M

% Day

% Avg

Off Exchange¹ 2M

48.17%

50.44%

Nasdaq GSM 1M

26.17%

26.36%

IEX 271K

5.56%

4.94%

NYSE Arca 254K

5.22%

7.44%

Cboe EDGX 149K

3.07%

2.88%

NYSE National 119K

2.45%

0.79%

Cboe BYX 103K

2.12%

0.89%

Cboe BZX 99K

2.04%

2.10%

Cboe EDGA 68K

1.40%

0.33%

MEMX 68K

1.40%

NYSE 50K

1.02%

1.42%

Nasdaq BX 24K

0.49%

0.21%

MIAX Pearl 18K

0.36%

0.50%

Nasdaq PHLX 13K

0.26%

0.10%

NYSE American 10K

0.21%

0.10%

CHX 2K

0.05%

0.07%

24X National 368

0.01%

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 2,346,397, which is 48.17% of today's total volume.
Today's Lit volume is 2,524,193, which is 51.83%.
Over the past 30 days, the average Off Exchange & Dark Pool volume has been 50.44%.
The average Lit volume has been 49.56%.

ALT Volume by Exchange

Off Exchange

Nasdaq GSM

IEX

NYSE Arca

Cboe EDGX

NYSE National

Cboe BYX

Cboe BZX

Cboe EDGA

MEMX

NYSE