XOOMAR

ASTROTECH Corp (ASTC)

Every FINRA and SEC series the site collects for ASTROTECH Corp: short interest with days to cover, daily short sale volume, fails to deliver and Form 4 insider trades. Listed on Nasdaq.

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78K

Short interest

settlement 2026-08-31

1.5

Days to cover

-29.2% vs prior

62.8%

Short share of volume

2026-09-17

22

Fails to deliver

settlement 2026-08-31

Thu 24 Sep

Next earnings

estimated; last year 2025-09-25

$0

Insider flow, 90 days

0 buys, 0 sells

As of 2026-09-17.

Short interest

FINRA, twice a month; the last 12 months shown, all 48 settlements in the JSON

As of 31 August 2026, short interest in ASTC is 78,350 shares, up 27,948 shares over the last month. Over the last 48 readings it ranged from 1,064 shares (14 February 2025) to 1,007,150 shares (29 May 2026). The latest reading sits at the bottom of that range. At the reported average volume of 53K shares a day that is 1.5 days to cover.

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SettlementShares shortChangeAvg daily volumeDays to cover
2026-08-3178,350-29.2%53,2221.47
2026-08-14110,734+119.7%570,6531.00
2026-07-3150,402-43.9%66,0711.00
2026-07-1589,847-43.1%149,7291.00
2026-06-30157,846+19.6%472,5951.00
2026-06-15131,925-86.9%2,914,0101.00
2026-05-291,007,150+2336.3%24,372,1211.00
2026-05-1541,339-45.6%33,8821.22
2026-04-3075,943+95.2%129,7371.00
2026-04-1538,911-96.0%594,8301.00
2026-03-31960,143+3232.9%9,808,6341.00
2026-03-1328,808-2.4%6,5724.38
2026-02-2729,521+30.4%7,4553.96
2026-02-1322,640-3.1%9,8852.29
2026-01-3023,358-9.8%11,1542.09
2026-01-1525,894-36.8%15,1571.71
2025-12-3140,960-65.5%34,6101.18
2025-12-15118,829+503.0%219,5941.00
2025-11-2819,705-36.9%20,7811.00
2025-11-1431,247-2.9%12,8782.43
2025-10-3132,176-43.3%27,9681.15
2025-10-1556,718+865.4%2,890,6781.00
2025-09-305,875-24.5%14,5091.00
2025-09-157,778+42.7%7,5801.03

Daily short volume

FINRA Reg SHO, last 60 sessions. JSON

As of 17 September 2026, the short share of ASTC volume is 62.8%, up 31.8 points over the last five sessions. Over the last 52 readings it ranged from 31.0% (10 September 2026) to 81.5% (8 September 2026). The latest reading is 3.9 points above the 30-session average of 58.9%, on 12K shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-09-177K12K62.8%5
2026-09-1614K25K56.1%500
2026-09-156K10K64.3%0
2026-09-1422K28K79.5%0
2026-09-115K13K35.0%0
2026-09-107K22K31.0%0
2026-09-097K13K54.4%0
2026-09-0813K16K81.5%320
2026-09-0413K18K70.4%0
2026-09-0310K12K79.8%0
2026-09-024K7K54.9%0
2026-09-016K8K71.3%0
2026-08-3111K18K62.2%0
2026-08-286K11K58.3%0
2026-08-2710K13K75.5%0
2026-08-2610K17K58.2%265
2026-08-2518K32K57.6%1,323
2026-08-2412K18K64.5%46
2026-08-218K15K52.8%4
2026-08-2041K78K53.0%16
2026-08-1913K23K55.9%0
2026-08-187K17K39.0%71
2026-08-1727K42K65.0%16,790
2026-08-1414K28K49.1%1,650
2026-08-1349K77K63.4%145
2026-08-1226K59K43.4%411
2026-08-1182K142K57.8%635
2026-08-10126K197K64.1%360
2026-08-0737K77K48.0%8
2026-08-06104K180K57.8%1,358

Fails to deliver

SEC, by settlement date. JSON

As of 31 August 2026, the fails-to-deliver balance in ASTC is 22 shares, down 740 shares over the last settlement date. Over the last 52 readings it ranged from 17 shares (20 July 2026) to 884,706 shares (28 May 2026). The latest reading sits at the bottom of that range.

SettlementShares failedPriceValue
2026-08-3122$7.15$157
2026-08-28762$7.12$5K
2026-08-27805$6.93$6K
2026-08-181,538$8.16$13K
2026-08-17978$8.41$8K
2026-08-12617$9.40$6K
2026-08-117,355$9.75$72K
2026-08-076,230$9.01$56K
2026-08-0615,420$9.11$140K
2026-08-05729$7.24$5K
2026-08-04901$6.78$6K
2026-08-0369$6.54$451
2026-07-3166$6.27$414
2026-07-29943$6.41$6K
2026-07-281,657$7.58$13K
2026-07-273,171$7.20$23K
2026-07-24206$7.56$2K
2026-07-232,956$7.30$22K
2026-07-22536$7.55$4K
2026-07-21159$7.60$1K
2026-07-2017$7.73$131
2026-07-162,158$7.94$17K
2026-07-155,090$8.86$45K
2026-07-141,914$8.56$16K
2026-07-083,062$9.43$29K
2026-07-071,266$10.29$13K
2026-07-061,385$10.45$14K
2026-07-0220,914$11.82$247K
2026-07-01455$10.91$5K
2026-06-3024,765$12.18$302K

Insider trades

SEC Form 4, newest first, 50 of 100 shown. JSON

No open-market insider trades were reported for ASTC in the last 90 days. The most recent filings are listed below; grants and option exercises carry a weaker signal than voluntary trades. Latest filing: Winn Charles Arch on 2026-09-01.

DateInsiderTitleTypeSharesPriceValueOwned after
2026-09-01Winn Charles Archn/aGrant2K$0.00$013K
2026-07-22Badugu NihanthChief Operating OfficerGrant5K$0.00$05K
2026-07-16Kreps Matthewn/aGrant2K$0.00$02K
2026-07-16Halinski John Williamn/aGrant2K$0.00$011K
2026-07-16Stober Ericn/aGrant2K$0.00$018K
2026-07-09Halinski John Williamn/aGrant1K$0.00$012K
2026-07-09Winn Charles Archn/aGrant1K$0.00$011K
2026-07-09MCFARLAND ROBERT Nn/aGrant1K$0.00$011K
2026-07-09Stober Ericn/aGrant1K$0.00$020K
2026-07-09Wilkinson Tomn/aGrant1K$0.00$031K
2026-04-14Winn Charles Archn/aGrant6K$0.00$010K
2026-04-14Stober Ericn/aGrant6K$0.00$016K
2026-04-14MCFARLAND ROBERT Nn/aGrant6K$0.00$020K
2026-04-14Wilkinson Tomn/aGrant6K$0.00$030K
2025-10-03Leonard Braden Michaeln/aSell9K$5.83$53K0
2025-10-03Leonard Braden Michaeln/aSell220K$7.13$1.6M0
2025-05-22Canas JenniferChief Financial OfficerGrant5K$0.00$05K
2025-05-14Wilkinson Thomas WileyDirectorGrant3K$0.00$024K
2025-05-14Winn Charles ArchDirectorGrant3K$0.00$04K
2025-05-14Halinski John WilliamDirectorGrant3K$0.00$03K
2025-05-14Pickens Thomas Boone IIICEOGrant50K$0.00$0181K
2025-05-14Stober EricDirectorGrant3K$0.00$010K
2025-05-14MCFARLAND ROBERT NDirectorGrant3K$0.00$014K
2025-05-14Halinski John Williamn/aGrant6K$0.00$09K
2024-05-29Becker James FrankDirectorBuy1K$9.82$11K16K
2024-05-28Becker James FrankDirectorBuy934$9.50$9K15K
2024-05-21Wilkinson Thomas WileyDirectorBuy1K$9.50$11K21K
2024-03-15Becker James FrankDirectorBuy649$8.25$5K14K
2024-03-15Russler Daniel T JrDirectorBuy387$8.42$3K15K
2024-03-13Wilkinson Thomas WileyDirectorBuy1K$8.28$11K20K
2024-03-13Becker James FrankDirectorBuy839$8.16$7K13K
2024-03-12Becker James FrankDirectorBuy958$8.14$8K13K
2024-03-12Russler Daniel T JrDirectorBuy500$8.29$4K15K
2023-12-29MCFARLAND ROBERT NDirectorBuy21$8.34$17510K
2023-12-27MCFARLAND ROBERT NDirectorBuy1K$8.19$10K10K
2023-12-11Russler Daniel T JrDirectorBuy650$7.65$5K14K
2023-11-28Becker James FrankDirectorBuy490$8.13$4K12K
2023-11-28Hinojosa JaimeCFOBuy1K$8.19$8K7K
2023-11-22Becker James FrankDirectorBuy1K$7.47$8K11K
2023-11-20MCFARLAND ROBERT NDirectorBuy1K$7.80$10K8K
2023-11-17Becker James FrankDirectorBuy1K$7.66$10K10K
2023-11-17MCFARLAND ROBERT NDirectorBuy54$7.50$4057K
2023-11-16Wilkinson Thomas WileyDirectorBuy2K$7.47$11K18K
2023-09-29Wilkinson Thomas WileyDirectorGrant5K$10.10$51K17K
2023-09-29MCFARLAND ROBERT NDirectorGrant5K$10.10$51K7K
2023-09-29Russler Daniel T JrDirectorGrant5K$10.10$51K13K
2023-09-29Becker James FrankDirectorGrant5K$10.10$51K9K
2023-05-23Hinojosa JaimeCFOBuy900$9.49$9K8K
2023-05-18Wilkinson Thomas WileyDirectorBuy1K$10.81$11K12K
2023-05-18Becker James FrankDirectorBuy48$10.71$5144K

Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are the rarer, stronger signal.

Large holders (13D and 13G)

One row per reporting person, newest filing first. JSON

3 holders above 5% have filed on ASTC, 2 on Schedule 13D (active intent). The largest reported stake is Skylark Partners I, LP at 0.0% of the class (100 shares), filed 2026-07-01 for an event on 2026-06-30.

FiledFormHolderSharesOf classEvent
2026-07-0113G/Ano. 1Skylark Partners I, LPpartnership1000.0%2026-06-30
2025-12-2313GSkylark Partners I, LPpartnership94K5.4%2025-09-29
2025-10-0713D/Ano. 1BML Investment Partners, L.P.partnership00.0%2025-10-03
2025-10-0713D/Ano. 1Leonard Braden Michaelindividual00.0%2025-10-03

What this page is

ASTROTECH Corp in the regulatory record

Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page pulls every series the site collects for one ticker onto one URL, keyed by the SEC's own ticker list, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.

Each section has its own history table, a summary sentence built from the rows (last value, change, range with dates) and its own JSON and CSV links. Nothing on the page is written by a model; the sentences change only when the data does. A page exists only for companies with data in at least two series, and every section says when its source last updated.

This page follows ASTROTECH Corp (ASTC), SEC CIK 1001907, listed on Nasdaq. The cross-market tables live on the short interest and insider transactions hubs.

Source and method

Short interest
FINRA consolidated short interestTwice a month, about eight business days after settlement. Latest 2026-08-31.JSON and CSV
Daily short volume
FINRA Reg SHO daily filesEvery trading day, loaded the following morning. Latest 2026-09-17.JSON and CSV
Fails to deliver
SEC fails-to-deliver dataTwice a month, a few weeks after the half month ends. Latest 2026-08-31.JSON and CSV
Large holders
SEC EDGAR Schedule 13D and 13GEDGAR read every 30 minutes; 13D within five business days of crossing 5%, 13G on the passive schedule. Latest 2026-07-01.JSON and CSV
Earnings dates
SEC EDGAR 8-K Item 2.02 (full-text search)EDGAR full-text search read twice a day; the estimate is last year's date plus 52 weeks. Latest 2026-05-13.JSON and CSV
Insider trades
SEC EDGAR Form 4EDGAR read every 30 minutes; filings are due two business days after the trade. Latest 2026-09-01.JSON and CSV
Company record
EDGAR filing index for CIK 1001907Ticker, name and exchange from the SEC's company list, refreshed weekly.
Rate limits
30 requests a minute without a key, 120 a minute with a key from a free account.

Data checks. Every dataset is checked against its source once a day. This dataset passed the last run, 18 Sep 05:40 UTC.

How to read it

  • Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
  • Insider buys next to a crowded short are the combination that has historically preceded squeezes; insider sells next to a crowded short are common and mean little.
  • Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.

Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.

Other company pages

Datasets

Frequently Asked Questions

How much of ASTC is sold short?
78,350 shares were held short at the 2026-08-31 settlement, 1.5 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.
What is ASTC's daily short volume?
On 2026-09-17, 7,459 of the 11,871 ASTC shares reported to FINRA were sold short, 62.8% of the day's reported volume. Short volume is a flow for one day, not a position.
Does ASTC have fails to deliver?
The SEC's latest file shows 22 ASTC shares failed to deliver at settlement 2026-08-31. Fails are reported per settlement date and published twice a month with a lag.
Are ASTC insiders buying or selling?
No open-market insider trades were reported for ASTC in the last 90 days. The most recent filings are listed below; grants and option exercises carry a weaker signal than voluntary trades. Latest filing: Winn Charles Arch on 2026-09-01.
Who owns more than 5% of ASTC?
3 holders above 5% have filed on ASTC, 2 on Schedule 13D (active intent). The largest reported stake is Skylark Partners I, LP at 0.0% of the class (100 shares), filed 2026-07-01 for an event on 2026-06-30.

Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.