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Vaxart, Inc.

VXRT
Exchange
OTC
Industry
Biological Products, (No Diagnostic Substances)
SEC CIK
0000072444

No open-market purchases or sales by Vaxart, Inc. insiders were filed in the last 90 days; 4 institutions reported holding it in 13F filings for Q2 2026, worth $39.0K in total; no superinvestor holds it.

Four kinds of short-selling data, each measuring something different:

  • Short interest: shares sold short and not yet bought back, as of a settlement date. FINRA publishes it twice a month, about eight business days after the settlement date.
  • Daily short volume: shares sold short each day in off-exchange trades reported to FINRA. It counts trades, not open positions, and is published the next day.
  • Fails-to-deliver: shares not delivered by the settlement date. The SEC publishes them twice a month, about two weeks late.
  • ATS (dark pool) volume: weekly volume on alternative trading systems and other off-exchange venues. FINRA publishes it two to four weeks after the week.

More in the glossary.

Short interest

Shares sold short and not yet bought back, from FINRA, on every settlement date in the last two years.

Short interest
2.42M
Shares, settlement Oct 30, 2026
Change
+13.0K
+0.5% vs. Oct 15, 2026
Days to cover
3.95
Short interest ÷ average daily volume
Average daily volume
611.6K
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 11,273,316 sharesNov 15, 2024: 11,460,312 sharesNov 29, 2024: 11,194,077 sharesDec 13, 2024: 11,285,221 sharesDec 31, 2024: 11,577,645 sharesJan 15, 2025: 11,617,235 sharesJan 31, 2025: 11,112,316 sharesFeb 14, 2025: 11,353,052 sharesFeb 28, 2025: 13,284,152 sharesMar 14, 2025: 12,229,363 sharesMar 31, 2025: 12,916,077 sharesApr 15, 2025: 13,157,854 sharesApr 30, 2025: 12,052,061 sharesMay 15, 2025: 14,348,733 sharesMay 30, 2025: 14,675,190 sharesJun 13, 2025: 21,173,323 sharesJun 30, 2025: 16,957,900 sharesJul 15, 2025: 8,770,671 sharesJul 31, 2025: 8,047,045 sharesAug 15, 2025: 7,462,789 sharesAug 29, 2025: 7,345,991 sharesSep 15, 2025: 6,888,494 sharesSep 30, 2025: 6,880,755 sharesOct 15, 2025: 6,369,312 sharesOct 31, 2025: 5,854,051 sharesNov 14, 2025: 5,921,465 sharesNov 28, 2025: 5,264,078 sharesDec 15, 2025: 3,975,961 sharesDec 31, 2025: 3,676,417 sharesJan 15, 2026: 3,613,377 sharesJan 30, 2026: 3,660,188 sharesFeb 13, 2026: 3,708,866 sharesFeb 27, 2026: 3,643,884 sharesMar 13, 2026: 3,275,378 sharesMar 31, 2026: 3,015,529 sharesApr 15, 2026: 3,043,896 sharesApr 30, 2026: 2,923,760 sharesMay 15, 2026: 2,660,202 sharesMay 29, 2026: 2,656,719 sharesJun 15, 2026: 2,627,832 sharesJun 30, 2026: 2,585,593 sharesJul 15, 2026: 2,571,609 sharesJul 31, 2026: 2,458,625 sharesAug 14, 2026: 2,334,259 sharesAug 31, 2026: 2,311,972 sharesSep 15, 2026: 2,306,655 sharesSep 30, 2026: 2,326,956 sharesOct 15, 2026: 2,404,459 sharesOct 30, 2026: 2,417,496 shares
Short interest in VXRT by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 20262.42M+13.0K+0.5%611.6K3.95
Oct 15, 20262.40M+77.5K+3.3%495.3K4.85
Sep 30, 20262.33M+20.3K+0.9%499.8K4.66
Sep 15, 20262.31M−5.32K−0.2%517.7K4.46
Aug 31, 20262.31M−22.3K−1.0%602.6K3.84
Aug 14, 20262.33M−124.4K−5.1%432.8K5.39
Jul 31, 20262.46M−113.0K−4.4%627.3K3.92
Jul 15, 20262.57M−14.0K−0.5%603.8K4.26
Jun 30, 20262.59M−42.2K−1.6%750.3K3.45
Jun 15, 20262.63M−28.9K−1.1%625.6K4.20
May 29, 20262.66M−3.48K−0.1%946.1K2.81
May 15, 20262.66M−263.6K−9.0%962.9K2.76
Apr 30, 20262.92M−120.1K−4.0%824.6K3.55
Apr 15, 20263.04M+28.4K+0.9%609.1K5.00
Mar 31, 20263.02M−259.8K−7.9%997.0K3.02
Mar 13, 20263.28M−368.5K−10.1%1.24M2.64
Feb 27, 20263.64M−65.0K−1.8%1.25M2.92
Feb 13, 20263.71M+48.7K+1.3%673.4K5.51
Jan 30, 20263.66M+46.8K+1.3%1.54M2.38
Jan 15, 20263.61M−63.0K−1.7%4.14M1.00
Dec 31, 20253.68M−299.5K−7.5%1.14M3.23
Dec 15, 20253.98M−1.29M−24.5%1.02M3.91
Nov 28, 20255.26M−657.4K−11.1%876.2K6.01
Nov 14, 20255.92M+67.4K+1.2%1.55M3.83
Oct 31, 20255.85M−515.3K−8.1%969.3K6.04
Oct 15, 20256.37M−511.4K−7.4%1.11M5.74
Sep 30, 20256.88M−7.74K−0.1%1.06M6.52
Sep 15, 20256.89M−457.5K−6.2%1.01M6.79
Aug 29, 20257.35M−116.8K−1.6%893.1K8.23
Aug 15, 20257.46M−584.3K−7.3%1.06M7.07
Jul 31, 20258.05M−723.6K−8.3%2.29M3.51
Jul 15, 20258.77M−8.19M−48.3%11.0M1.00
Jun 30, 202517.0M−4.22M−19.9%2.95M5.75
Jun 13, 202521.2M+6.50M+44.3%15.9M1.34
May 30, 202514.7M+326.5K+2.3%1.90M7.73
May 15, 202514.3M+2.30M+19.1%1.64M8.73
Apr 30, 202512.1M−1.11M−8.4%1.74M6.93
Apr 15, 202513.2M+241.8K+1.9%2.18M6.03
Mar 31, 202512.9M+686.7K+5.6%1.78M7.25
Mar 14, 202512.2M−1.05M−7.9%1.72M7.12
Feb 28, 202513.3M+1.93M+17.0%3.01M4.42
Feb 14, 202511.4M+240.7K+2.2%1.18M9.63
Jan 31, 202511.1M−504.9K−4.4%1.09M10.20
Jan 15, 202511.6M+39.6K+0.3%3.03M3.83
Dec 31, 202411.6M+292.4K+2.6%2.26M5.12
Dec 13, 202411.3M+91.1K+0.8%1.39M8.14
Nov 29, 202411.2M−266.2K−2.3%1.34M8.34
Nov 15, 202411.5M+187.0K+1.7%1.88M6.11
Oct 31, 202411.3M−452.9K−3.9%930.1K12.12

Fails-to-deliver

Shares that weren't delivered by the settlement date, from the SEC, for the last 30 dates with fails. The price is the previous day's closing price published by the SEC.

Fails-to-deliver in VXRT by settlement date
Settlement dateSharesPriceValue
Oct 14, 20262,850$0.46$1.31K
Oct 13, 20261,603$0.44$705.32
Sep 28, 2026625$0.45$281.25
Sep 21, 2026400$0.49$196
Sep 10, 2026126$0.49$61.74
Aug 20, 2026231$0.50$115.5
Aug 14, 20266,176$0.56$3.46K
Aug 13, 20266,645$0.56$3.72K
Jul 13, 202637,723$0.55$20.7K
Jul 10, 202648,065$0.55$26.4K
Jul 1, 20269$0.61$5.49
Jun 30, 20261,901$0.57$1.08K
Jun 3, 20269,249$0.62$5.73K
May 28, 20264,349$0.64$2.78K
May 1, 20262,608$0.77$2.01K
Apr 23, 202649,991$0.74$37.0K
Apr 22, 2026111,891$0.76$85.0K
Apr 21, 202661,965$0.76$47.1K
Apr 20, 202674$0.75$55.5
Apr 7, 202625,000$0.63$15.8K
Mar 31, 20261$0.60$0.6
Mar 30, 20262,880$0.65$1.87K
Mar 11, 2026624$0.77$480.48
Mar 10, 202674$0.80$59.2
Mar 4, 2026550$0.75$412.5
Mar 3, 2026550$0.78$429
Mar 2, 202646,448$0.80$37.2K
Feb 26, 20263,525$0.72$2.54K
Feb 19, 202618$0.55$9.9
Jan 30, 20266,360$0.61$3.88K

Daily short volume

Off-exchange short-sale volume, not short interest: shares sold short each day in trades reported to FINRA, for the last 30 trading days.

The short volume ratio isn't a sentiment gauge: market makers sell short to fill buy orders and to hedge, so short sales are usually about half of off-exchange volume.

Off-exchange short volume in VXRT by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Jul 7, 20256,286,396476,00810,814,68358.1%
Jul 3, 2025493,98251,087,71945.4%
Jul 2, 2025882,4934,2002,119,54941.6%
Jul 1, 2025860,24513,0201,839,09646.8%
Jun 30, 2025764,16925,5911,663,46745.9%
Jun 27, 2025948,7287,7301,825,51552.0%
Jun 26, 2025233,447200492,59847.4%
Jun 25, 2025561,7641,0491,077,23152.1%
Jun 24, 2025672,83215,9331,570,01642.9%
Jun 23, 2025519,0177,9431,187,91643.7%
Jun 20, 2025794,48111,8001,403,89956.6%
Jun 18, 20251,009,783104,4811,767,16157.1%
Jun 17, 2025788,27178,4841,940,02440.6%
Jun 16, 20252,061,324303,2384,085,63850.5%
Jun 13, 202511,601,707118,95419,955,52158.1%
Jun 12, 20252,287,23039,7285,098,71044.9%
Jun 11, 202514,854,892101,29527,445,48754.1%
Jun 10, 2025690,4617801,073,79764.3%
Jun 9, 2025394,935273582,15767.8%
Jun 6, 2025304,5780479,31363.5%
Jun 5, 2025480,3250646,19874.3%
Jun 4, 2025579,5175,0921,048,67555.3%
Jun 3, 2025506,3051,4091,026,31049.3%
Jun 2, 2025526,68656,080885,48959.5%
May 30, 2025410,16523,964749,37354.7%
May 29, 2025415,2361,501701,14759.2%
May 28, 20251,117,2439001,408,64279.3%
May 27, 2025439,3814,886813,01754.0%
May 23, 2025326,9020506,34064.6%
May 22, 2025249,73730,693414,85960.2%

ATS (dark pool) volume

Weekly volume on alternative trading systems (ATS) and other off-exchange (OTC) venues, from FINRA, for the last 12 weeks. ATS share is ATS volume ÷ (ATS + OTC volume), not a share of all trading.

Weekly ATS and OTC volume in VXRT
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026OTCE231,7601691,039,45899318.2%
Sep 28, 2026OTCE77,6011381,086,1119686.7%
Sep 21, 2026OTCE133,7921201,316,8231,0819.2%
Sep 14, 2026OTCE102,3291191,500,6941,1936.4%
Sep 7, 2026OTCE57,37975753,7948107.1%
Aug 31, 2026OTCE142,324138981,6861,01812.7%
Aug 24, 2026OTCE136,9321471,455,9861,1168.6%
Aug 17, 2026OTCE103,9561431,621,8901,3856.0%
Aug 10, 2026OTCE83,732931,285,1441,2076.1%
Aug 3, 2026OTCE27,374561,242,1821,4512.2%
Jul 27, 2026OTCE117,696821,275,8581,1598.4%
Jul 20, 2026OTCE86,442981,661,8661,1234.9%