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Biodesix Inc

BDSX
Exchange
Nasdaq
Industry
Services-Medical Laboratories
SEC CIK
0001439725

In the last 90 days, Biodesix Inc insiders filed 1 open-market purchase and 0 sales; 45 institutions reported holding it in 13F filings for Q2 2026, worth $98.5M 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
210.0K
Shares, settlement Oct 30, 2026
Change
+514
+0.3% vs. Oct 15, 2026
Days to cover
2.46
Short interest ÷ average daily volume
Average daily volume
85.5K
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 415,740 sharesNov 15, 2024: 388,861 sharesNov 29, 2024: 624,230 sharesDec 13, 2024: 903,139 sharesDec 31, 2024: 836,593 sharesJan 15, 2025: 756,313 sharesJan 31, 2025: 748,374 sharesFeb 14, 2025: 781,342 sharesFeb 28, 2025: 973,182 sharesMar 14, 2025: 1,257,555 sharesMar 31, 2025: 1,158,140 sharesApr 15, 2025: 1,022,304 sharesApr 30, 2025: 1,053,934 sharesMay 15, 2025: 2,481,848 sharesMay 30, 2025: 5,633,530 sharesJun 13, 2025: 5,259,810 sharesJun 30, 2025: 4,907,456 sharesJul 15, 2025: 4,280,989 sharesJul 31, 2025: 3,919,218 sharesAug 15, 2025: 3,768,020 sharesAug 29, 2025: 3,080,354 sharesSep 15, 2025: 297,541 sharesSep 30, 2025: 161,558 sharesOct 15, 2025: 97,662 sharesOct 31, 2025: 188,388 sharesNov 14, 2025: 133,547 sharesNov 28, 2025: 75,405 sharesDec 15, 2025: 83,042 sharesDec 31, 2025: 80,722 sharesJan 15, 2026: 483,591 sharesJan 30, 2026: 249,443 sharesFeb 13, 2026: 239,064 sharesFeb 27, 2026: 222,245 sharesMar 13, 2026: 179,099 sharesMar 31, 2026: 181,818 sharesApr 15, 2026: 174,016 sharesApr 30, 2026: 148,012 sharesMay 15, 2026: 137,196 sharesMay 29, 2026: 106,463 sharesJun 15, 2026: 104,666 sharesJun 30, 2026: 105,427 sharesJul 15, 2026: 167,970 sharesJul 31, 2026: 157,187 sharesAug 14, 2026: 150,085 sharesAug 31, 2026: 220,383 sharesSep 15, 2026: 214,006 sharesSep 30, 2026: 201,849 sharesOct 15, 2026: 209,504 sharesOct 30, 2026: 210,018 shares
Short interest in BDSX by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 2026210.0K+514+0.3%85.5K2.46
Oct 15, 2026209.5K+7.66K+3.8%89.3K2.35
Sep 30, 2026201.8K−12.2K−5.7%109.8K1.84
Sep 15, 2026214.0K−6.38K−2.9%65.0K3.29
Aug 31, 2026220.4K+70.3K+46.8%166.1K1.33
Aug 14, 2026150.1K−7.10K−4.5%94.8K1.58
Jul 31, 2026157.2K−10.8K−6.4%58.7K2.68
Jul 15, 2026168.0K+62.5K+59.3%76.5K2.19
Jun 30, 2026105.4K+761+0.7%125.5K1.00
Jun 15, 2026104.7K−1.80K−1.7%39.9K2.62
May 29, 2026106.5K−30.7K−22.4%46.9K2.27
May 15, 2026137.2K−10.8K−7.3%101.6K1.35
Apr 30, 2026148.0K−26.0K−14.9%58.5K2.53
Apr 15, 2026174.0K−7.80K−4.3%55.6K3.13
Mar 31, 2026181.8K+2.72K+1.5%76.7K2.37
Mar 13, 2026179.1K−43.1K−19.4%176.8K1.01
Feb 27, 2026222.2K−16.8K−7.0%127.4K1.74
Feb 13, 2026239.1K−10.4K−4.2%130.5K1.83
Jan 30, 2026249.4K−234.1K−48.4%419.3K1.00
Jan 15, 2026483.6K+402.9K+499.1%7.87M1.00
Dec 31, 202580.7K−2.32K−2.8%68.5K1.18
Dec 15, 202583.0K+7.64K+10.1%63.1K1.32
Nov 28, 202575.4K−58.1K−43.5%56.0K1.35
Nov 14, 2025133.5K−54.8K−29.1%116.1K1.15
Oct 31, 2025188.4K+90.7K+92.9%437.5K1.00
Oct 15, 202597.7K−63.9K−39.6%39.0K2.50
Sep 30, 2025161.6K−136.0K−45.7%124.6K1.30
Sep 15, 2025Split297.5K−2.78M−90.3%543.6K1.00
Aug 29, 20253.08M−687.7K−18.3%1.37M2.25
Aug 15, 20253.77M−151.2K−3.9%1.45M2.59
Jul 31, 20253.92M−361.8K−8.5%1.40M2.81
Jul 15, 20254.28M−626.5K−12.8%766.3K5.59
Jun 30, 20254.91M−352.4K−6.7%1.19M4.14
Jun 13, 20255.26M−373.7K−6.6%2.53M2.08
May 30, 20255.63M+3.15M+127.0%47.3M1.00
May 15, 20252.48M+1.43M+135.5%2.84M1.00
Apr 30, 20251.05M+31.6K+3.1%440.0K2.40
Apr 15, 20251.02M−135.8K−11.7%397.9K2.57
Mar 31, 20251.16M−99.4K−7.9%224.7K5.15
Mar 14, 20251.26M+284.4K+29.2%856.8K1.47
Feb 28, 2025973.2K+191.8K+24.6%188.3K5.17
Feb 14, 2025781.3K+33.0K+4.4%349.7K2.23
Jan 31, 2025748.4K−7.94K−1.1%574.3K1.30
Jan 15, 2025756.3K−80.3K−9.6%381.4K1.98
Dec 31, 2024836.6K−66.5K−7.4%234.8K3.56
Dec 13, 2024903.1K+278.9K+44.7%272.9K3.31
Nov 29, 2024624.2K+235.4K+60.5%1.19M1.00
Nov 15, 2024388.9K−26.9K−6.5%543.2K1.00
Oct 31, 2024415.7K+607+0.2%162.1K2.56

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 BDSX by settlement date
Settlement dateSharesPriceValue
Oct 14, 20262,041$25.00$51.0K
Oct 13, 2026417$25.70$10.7K
Sep 23, 20263,676$28.15$103.5K
Sep 22, 20262,982$28.43$84.8K
Sep 11, 20264,323$26.04$112.6K
Sep 3, 2026193$27.16$5.24K
Sep 1, 20261,715$26.35$45.2K
Aug 31, 20261,710$26.83$45.9K
Aug 24, 2026110,520$26.63$2.94M
Aug 4, 20264,426$22.03$97.5K
Jul 24, 202613$22.32$290.16
Jul 23, 20261,622$21.39$34.7K
Jul 6, 2026176$21.99$3.87K
Jul 2, 20262,591$24.50$63.5K
Jul 1, 20262,358$22.55$53.2K
Jun 30, 2026822$23.81$19.6K
Jun 29, 20263,311$23.34$77.3K
Jun 24, 2026646$19.16$12.4K
Jun 22, 20261,959$16.81$32.9K
May 22, 2026388$15.18$5.89K
May 18, 20261,649$14.17$23.4K
May 11, 2026994$15.32$15.2K
May 7, 2026536$15.00$8.04K
May 5, 20262,538$11.27$28.6K
May 4, 20262,689$11.08$29.8K
May 1, 20265,971$10.98$65.6K
Apr 28, 2026405$10.13$4.10K
Apr 9, 20261,968$14.25$28.0K
Apr 7, 202610,140$15.36$155.8K
Apr 2, 20262,217$14.76$32.7K

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 BDSX by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 12, 202685,1030132,55864.2%
Nov 11, 2026155,7790249,13962.5%
Nov 10, 2026176,3040302,98658.2%
Nov 9, 2026272,18921,452489,97155.6%
Nov 6, 2026438,62945,108924,80047.4%
Nov 5, 202642,1431079,07553.3%
Nov 4, 202630,839056,05755.0%
Nov 3, 20264,717016,68628.3%
Nov 2, 202618,706038,14549.0%
Oct 30, 20266,657027,03424.6%
Oct 29, 202616,429033,06749.7%
Oct 28, 202615,887028,48855.8%
Oct 27, 202614,497027,39652.9%
Oct 26, 20266,75956820,33533.2%
Oct 23, 202617,37854269,86724.9%
Oct 22, 202619,825092,03521.5%
Oct 21, 20267,264024,66129.5%
Oct 20, 202613,290021,97360.5%
Oct 19, 202610,550021,14449.9%
Oct 16, 202616,430036,34045.2%
Oct 15, 20268,193014,73955.6%
Oct 14, 202617,203138,70844.4%
Oct 13, 202610,2162523,25143.9%
Oct 12, 20268,221019,92341.3%
Oct 9, 20268,828022,10039.9%
Oct 8, 202619,331049,72838.9%
Oct 7, 202613,501026,70950.5%
Oct 6, 202628,593049,95257.2%
Oct 5, 202635,713072,71349.1%
Oct 2, 202625,5441,59462,02141.2%

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 BDSX
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T2103,0422,944121,0373,73246.0%
Sep 28, 2026T2280,5674,748145,3053,41865.9%
Sep 21, 2026T2132,3933,939100,8781,88756.8%
Sep 14, 2026T282,3423,34673,3091,42052.9%
Sep 7, 2026T245,8593,35863,1061,24442.1%
Aug 31, 2026T294,7882,69664,8741,27959.4%
Aug 24, 2026T2218,6343,978240,8103,36447.6%
Aug 17, 2026T2261,1334,405154,2381,75762.9%
Aug 10, 2026T2127,7553,47881,2541,03161.1%
Aug 3, 2026T2100,4233,705101,2531,04749.8%
Jul 27, 2026T255,4601,63436,2091,02560.5%
Jul 20, 2026T279,0951,98864,2131,42255.2%