SI-BONE, Inc. (SIBN)

As of 31 August 2026, short interest in SIBN is 5,626,900 shares, up 546,250 shares over the last month. Over the last 48 readings it ranged from 1,016,670 shares (31 January 2025) to 5,978,449 shares (30 June 2026). The latest reading sits at the top of that range. At the reported average volume of 571K shares a day that is 9.9 days to cover, elevated.

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As of 17 September 2026, the short share of SIBN volume is 50.5%, down 25.0 points over the last five sessions. Over the last 52 readings it ranged from 14.0% (8 July 2026) to 79.3% (10 August 2026). The latest reading is 12.1 points below the 30-session average of 62.6%, on 272K shares reported.

As of 24 August 2026, the fails-to-deliver balance in SIBN is 2,969 shares, up 2,955 shares over the last settlement date. Over the last 52 readings it ranged from 10 shares (12 September 2025) to 34,573 shares (2 December 2025). The latest reading sits at the bottom of that range.

Insiders at SIBN reported 18 open-market sells worth $3.4M in the last 90 days and no open-market buys. Sells alone are a weak signal; insiders sell for tax, diversification and estate reasons all the time. Latest filing: DUNN JEFFREY W on 2026-09-01.

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.

19 Form 144 notices on file for SIBN worth $7.9M at the prices reported; 7 in the last 90 days worth $3.6M. Latest: ANSHUL MAHESHWARI filed on 2026-08-24 to sell 11,636 shares ($232K) from 2026-08-24.

19 holders above 5% have filed on SIBN, all on Schedule 13G (passive). The largest reported stake is Mathew P. Arens at 18.4% of the class (8,120,986 shares), filed 2026-05-07 for an event on 2026-04-30.

6 of the 30 tracked managers held SIBN at their latest 13F, $27.3M in total at quarter-end prices. Point72 Asset Management is the largest at $12.9M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 1 added shares and 5 cut.

Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.

In Q2 2026 (quarter ended 2026-06-30) SI-BONE, Inc. reported revenue of $56.0M, up 15.2% from the same quarter a year earlier, and net loss of $4.1M (-0.09 diluted EPS). In FY 2025 it generated -$675K of operating cash flow. As of 2026-06-30, cash was $33.1M against $35.6M of debt.

Quarterly, last 8 quarters

Fiscal years, with buybacks and dividends

Quarters are the three-month figures the company reports; a fourth quarter marked derived is the fiscal year less the three reported quarters, since companies report it only inside the 10-K. Fiscal years are the annual figures. Buybacks are cash paid to repurchase common stock in the year (XBRL PaymentsForRepurchaseOfCommonStock), not authorizations. Balance sheet lines are as of 2026-06-30; shares outstanding as of 2026-07-29 from the cover page.