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SI-BONE, Inc.

SIBN
Exchange
Nasdaq
Industry
Surgical & Medical Instruments & Apparatus
SEC CIK
0001459839

In the last 90 days, SI-BONE, Inc. insiders filed 0 open-market purchases and 18 sales; 167 institutions reported holding it in 13F filings for Q2 2026, worth $773.9M 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
4.70M
Shares, settlement Oct 15, 2026
Change
−411.7K
−8.1% vs. Sep 30, 2026
Days to cover
8.67
Short interest ÷ average daily volume
Average daily volume
542.6K
Shares, as reported by FINRA
Short interest by settlement date
Oct 15, 2024: 1,904,381 sharesOct 31, 2024: 1,616,131 sharesNov 15, 2024: 1,268,860 sharesNov 29, 2024: 1,110,912 sharesDec 13, 2024: 1,075,762 sharesDec 31, 2024: 1,123,812 sharesJan 15, 2025: 1,129,439 sharesJan 31, 2025: 1,016,670 sharesFeb 14, 2025: 1,073,766 sharesFeb 28, 2025: 1,261,829 sharesMar 14, 2025: 1,771,232 sharesMar 31, 2025: 1,552,064 sharesApr 15, 2025: 1,513,737 sharesApr 30, 2025: 1,535,315 sharesMay 15, 2025: 1,618,858 sharesMay 30, 2025: 1,857,088 sharesJun 13, 2025: 1,740,481 sharesJun 30, 2025: 1,961,909 sharesJul 15, 2025: 1,879,387 sharesJul 31, 2025: 1,868,592 sharesAug 15, 2025: 2,052,118 sharesAug 29, 2025: 2,162,155 sharesSep 15, 2025: 2,110,365 sharesSep 30, 2025: 2,406,382 sharesOct 15, 2025: 2,655,786 sharesOct 31, 2025: 2,765,679 sharesNov 14, 2025: 2,839,813 sharesNov 28, 2025: 2,639,548 sharesDec 15, 2025: 2,429,007 sharesDec 31, 2025: 2,428,753 sharesJan 15, 2026: 2,594,038 sharesJan 30, 2026: 2,429,780 sharesFeb 13, 2026: 2,691,361 sharesFeb 27, 2026: 2,871,776 sharesMar 13, 2026: 3,603,947 sharesMar 31, 2026: 3,882,808 sharesApr 15, 2026: 4,632,479 sharesApr 30, 2026: 4,537,455 sharesMay 15, 2026: 5,704,493 sharesMay 29, 2026: 5,879,708 sharesJun 15, 2026: 5,924,425 sharesJun 30, 2026: 5,978,449 sharesJul 15, 2026: 5,507,086 sharesJul 31, 2026: 5,080,650 sharesAug 14, 2026: 5,336,842 sharesAug 31, 2026: 5,626,900 sharesSep 15, 2026: 5,914,143 sharesSep 30, 2026: 5,116,241 sharesOct 15, 2026: 4,704,576 shares
Short interest in SIBN by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 15, 20264.70M−411.7K−8.1%542.6K8.67
Sep 30, 20265.12M−797.9K−13.5%591.1K8.66
Sep 15, 20265.91M+287.2K+5.1%555.4K10.65
Aug 31, 20265.63M+290.1K+5.4%570.7K9.86
Aug 14, 20265.34M+256.2K+5.0%489.0K10.91
Jul 31, 20265.08M−426.4K−7.7%466.1K10.90
Jul 15, 20265.51M−471.4K−7.9%616.5K8.93
Jun 30, 20265.98M+54.0K+0.9%702.4K8.51
Jun 15, 20265.92M+44.7K+0.8%432.2K13.71
May 29, 20265.88M+175.2K+3.1%543.3K10.82
May 15, 20265.70M+1.17M+25.7%1.13M5.06
Apr 30, 20264.54M−95.0K−2.1%497.3K9.12
Apr 15, 20264.63M+749.7K+19.3%832.5K5.56
Mar 31, 20263.88M+278.9K+7.7%599.7K6.47
Mar 13, 20263.60M+732.2K+25.5%538.8K6.69
Feb 27, 20262.87M+180.4K+6.7%655.7K4.38
Feb 13, 20262.69M+261.6K+10.8%398.5K6.75
Jan 30, 20262.43M−164.3K−6.3%496.1K4.90
Jan 15, 20262.59M+165.3K+6.8%708.2K3.66
Dec 31, 20252.43M−2540.0%386.3K6.29
Dec 15, 20252.43M−210.5K−8.0%532.0K4.57
Nov 28, 20252.64M−200.3K−7.1%625.6K4.22
Nov 14, 20252.84M+74.1K+2.7%802.5K3.54
Oct 31, 20252.77M+109.9K+4.1%295.2K9.37
Oct 15, 20252.66M+249.4K+10.4%510.8K5.20
Sep 30, 20252.41M+296.0K+14.0%424.8K5.67
Sep 15, 20252.11M−51.8K−2.4%357.7K5.90
Aug 29, 20252.16M+110.0K+5.4%318.6K6.79
Aug 15, 20252.05M+183.5K+9.8%637.8K3.22
Jul 31, 20251.87M−10.8K−0.6%292.6K6.39
Jul 15, 20251.88M−82.5K−4.2%327.0K5.75
Jun 30, 20251.96M+221.4K+12.7%535.4K3.66
Jun 13, 20251.74M−116.6K−6.3%538.0K3.23
May 30, 20251.86M+238.2K+14.7%423.9K4.38
May 15, 20251.62M+83.5K+5.4%727.5K2.23
Apr 30, 20251.54M+21.6K+1.4%278.9K5.50
Apr 15, 20251.51M−38.3K−2.5%368.2K4.11
Mar 31, 20251.55M−219.2K−12.4%345.7K4.49
Mar 14, 20251.77M+509.4K+40.4%398.5K4.44
Feb 28, 20251.26M+188.1K+17.5%670.5K1.88
Feb 14, 20251.07M+57.1K+5.6%254.5K4.22
Jan 31, 20251.02M−112.8K−10.0%285.9K3.56
Jan 15, 20251.13M+5.63K+0.5%350.5K3.22
Dec 31, 20241.12M+48.0K+4.5%305.2K3.68
Dec 13, 20241.08M−35.1K−3.2%256.4K4.20
Nov 29, 20241.11M−157.9K−12.5%295.6K3.76
Nov 15, 20241.27M−347.3K−21.5%508.6K2.49
Oct 31, 20241.62M−288.3K−15.1%421.5K3.83
Oct 15, 20241.90M+211.8K+12.5%381.2K5.00

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 SIBN by settlement date
Settlement dateSharesPriceValue
Oct 9, 20261,018$18.86$19.2K
Oct 5, 2026221$18.08$4.00K
Sep 25, 20262,023$18.52$37.5K
Sep 14, 20263$18.38$55.14
Sep 11, 20262,802$18.30$51.3K
Sep 2, 202611,380$18.92$215.3K
Aug 24, 20262,969$19.96$59.3K
Aug 20, 202614$19.91$278.74
Aug 18, 20262,379$18.69$44.5K
Aug 11, 2026259$18.84$4.88K
Aug 7, 20261,047$18.14$19.0K
Aug 6, 2026348$18.04$6.28K
Aug 5, 20268,957$18.44$165.2K
Jul 28, 202610$17.05$170.5
Jul 21, 2026597$17.12$10.2K
Jul 16, 20262,465$17.25$42.5K
Jul 6, 2026592$17.11$10.1K
Jul 2, 20262,064$16.80$34.7K
Jul 1, 2026635$16.32$10.4K
Jun 30, 202624,417$16.88$412.2K
Jun 29, 202616,841$17.33$291.9K
Jun 26, 202615$16.76$251.4
Jun 24, 202615,189$15.95$242.3K
Jun 22, 20262,234$15.84$35.4K
Jun 15, 2026641$15.42$9.88K
Jun 2, 2026920$13.87$12.8K
May 29, 20262,724$14.41$39.3K
May 4, 20263,965$13.21$52.4K
Apr 7, 2026100$13.21$1.32K
Mar 12, 2026415$14.05$5.83K

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 SIBN by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 9, 2026189,8532792,16624.0%
Nov 6, 202684,05988303,88427.7%
Nov 5, 202691,7990396,14523.2%
Nov 4, 2026166,23601,079,42115.4%
Nov 3, 2026296,76201,886,78015.7%
Nov 2, 2026138,21449434,86031.8%
Oct 30, 2026159,8712,714279,27657.2%
Oct 29, 202686,2650283,20530.5%
Oct 28, 202656,1260170,21433.0%
Oct 27, 202673,3110151,34948.4%
Oct 26, 202651,5170132,21739.0%
Oct 23, 202695,9310182,05652.7%
Oct 22, 202686,8560231,87537.5%
Oct 21, 2026174,4847,945289,92560.2%
Oct 20, 2026115,9020222,94152.0%
Oct 19, 202669,1380108,79263.6%
Oct 16, 2026200,00910,200323,12461.9%
Oct 15, 202696,8903131,90273.5%
Oct 14, 202664,7040101,34463.8%
Oct 13, 202667,4220103,90064.9%
Oct 12, 202666,1121106,44162.1%
Oct 9, 202684,9920133,90163.5%
Oct 8, 2026128,7321,800203,62563.2%
Oct 7, 2026150,0300184,80781.2%
Oct 6, 2026140,3420189,88673.9%
Oct 5, 2026123,1275206,47759.6%
Oct 2, 2026128,750300160,48180.2%
Oct 1, 2026159,8280250,65863.8%
Sep 30, 2026177,9640256,74269.3%
Sep 29, 2026208,91910261,29580.0%

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 SIBN
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T2762,14717,885205,8182,87578.7%
Sep 28, 2026T2907,78824,405252,9293,44278.2%
Sep 21, 2026T21,202,67326,406211,4812,70085.0%
Sep 14, 2026T2848,50323,807324,5152,60172.3%
Sep 7, 2026T2782,74717,471201,3072,58279.5%
Aug 31, 2026T2578,48018,434558,3343,84650.9%
Aug 24, 2026T2909,12321,996357,4373,06771.8%
Aug 17, 2026T2707,65218,811575,1093,51355.2%
Aug 10, 2026T2473,03518,574134,0811,66077.9%
Aug 3, 2026T21,005,03725,008285,9083,20677.9%
Jul 27, 2026T2816,00126,150341,9673,80770.5%
Jul 20, 2026T2454,06215,635192,9112,25370.2%