Dark

ALT
Altimmune, Inc. Common Stock
stock NASDAQ

At Close

Oct 16, 2025 3:59:55 PM EDT

3.89USD-2.750%(-0.11)2,811,528

3.88Bid 3.90Ask 0.02Spread

Pre-market

Oct 16, 2025 9:28:30 AM EDT

3.99USD-0.250%(-0.01)8,436

After-hours

Oct 16, 2025 4:31:30 PM EDT

3.88USD-0.257%(-0.01)9,130

OverviewOptionsHistoricalExchange VolumeShortsMore

ALT Volume Oct 16, 2025

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Exchange	Day%	Volume	30D%
Off Exchange¹	57.54	1,626,179	53.20
Nasdaq GSM	16.46	465,270	23.87
NYSE Arca	7.58	214,281	6.40
Cboe BZX	5.10	144,089	2.81
IEX	3.23	91,150	3.71
Cboe EDGX	3.14	88,678	3.67
MIAX Pearl	1.58	44,551	1.01
Cboe EDGA	1.31	37,096	0.60
NYSE	1.14	32,264	1.50
MEMX	1.04	29,358	1.78
NYSE National	0.84	23,833	0.55
Cboe BYX	0.45	12,693	0.58
CHX	0.39	11,049	0.04
Nasdaq PHLX	0.11	3,164	0.09
Nasdaq BX	0.05	1,446	0.11
NYSE American	0.03	980	0.08

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

ALT Nutrition Facts

1.06 servings per container

Serving size

2.67M

Calories

2.83M

% Day

% Avg

Off Exchange¹ 2M

57.54%

53.20%

Nasdaq GSM 465K

16.46%

23.87%

NYSE Arca 214K

7.58%

6.40%

Cboe BZX 144K

5.10%

2.81%

IEX 91K

3.23%

3.71%

Cboe EDGX 89K

3.14%

3.67%

MIAX Pearl 45K

1.58%

1.01%

Cboe EDGA 37K

1.31%

0.60%

NYSE 32K

1.14%

1.50%

MEMX 29K

1.04%

1.78%

NYSE National 24K

0.84%

0.55%

Cboe BYX 13K

0.45%

0.58%

CHX 11K

0.39%

0.04%

Nasdaq PHLX 3K

0.11%

0.09%

Nasdaq BX 1K

0.05%

0.11%

NYSE American 980

0.03%

0.08%

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 1,626,179, which is 57.54% of today's total volume.
Today's Lit volume is 1,199,902, which is 42.46%.
Over the past 30 days, the average Off Exchange & Dark Pool volume has been 53.20%.
The average Lit volume has been 46.80%.

ALT Volume by Exchange

Off Exchange

Nasdaq GSM

NYSE Arca

Cboe BZX

IEX

Cboe EDGX

MIAX Pearl

Cboe EDGA

NYSE

MEMX

NYSE National