SHOULDER INNOVATIONS, INC. (SI)
Every FINRA and SEC series the site collects for SHOULDER INNOVATIONS, INC.: short interest with days to cover, daily short sale volume, fails to deliver and Form 4 insider trades. Listed on NYSE.
263K
Short interest
settlement 2026-08-14
1.9
Days to cover
+21.8% vs prior
80.6%
Short share of volume
2026-09-11
4,567
Fails to deliver
settlement 2026-08-13
-$5.0M
Insider flow, 90 days
0 buys, 14 sells
As of 2026-09-11.
Short interest
FINRA, twice a month; the last 12 months shown, all 48 settlements in the JSONAs of 14 August 2026, short interest in SI is 263,477 shares, up 55,052 shares over the last month. Over the last 48 readings it ranged from 182,853 shares (31 October 2025) to 21,152,967 shares (28 February 2023). The latest reading sits at the bottom of that range. At the reported average volume of 137K shares a day that is 1.9 days to cover.
Embed this chartfree, with the attribution line it carries
<iframe src="https://xoomar.com/embed/stocks/si" width="100%" height="440" style="border:0;max-width:100%" loading="lazy" title="XOOMAR chart"></iframe>
| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-08-14 | 263,477 | +21.8% | 137,006 | 1.92 |
| 2026-07-31 | 216,299 | +3.8% | 90,273 | 2.40 |
| 2026-07-15 | 208,425 | +6.7% | 113,744 | 1.83 |
| 2026-06-30 | 195,425 | -24.8% | 201,878 | 1.00 |
| 2026-06-15 | 259,817 | -10.4% | 96,110 | 2.70 |
| 2026-05-29 | 289,887 | -15.4% | 83,221 | 3.48 |
| 2026-05-15 | 342,733 | -21.1% | 94,427 | 3.63 |
| 2026-04-30 | 434,559 | -8.7% | 62,737 | 6.93 |
| 2026-04-15 | 475,948 | +21.6% | 86,284 | 5.52 |
| 2026-03-31 | 391,514 | +27.1% | 148,383 | 2.64 |
| 2026-03-13 | 307,956 | +11.1% | 92,628 | 3.32 |
| 2026-02-27 | 277,098 | +5.2% | 40,716 | 6.81 |
| 2026-02-13 | 263,481 | -13.0% | 87,453 | 3.01 |
| 2026-01-30 | 302,696 | +5.6% | 42,752 | 7.08 |
| 2026-01-15 | 286,619 | -2.3% | 38,756 | 7.40 |
| 2025-12-31 | 293,489 | -10.7% | 63,540 | 4.62 |
| 2025-12-15 | 328,472 | +4.5% | 43,083 | 7.62 |
| 2025-11-28 | 314,442 | +31.5% | 60,684 | 5.18 |
| 2025-11-14 | 239,160 | +30.8% | 100,984 | 2.37 |
| 2025-10-31 | 182,853 | -3.2% | 48,022 | 3.81 |
| 2025-10-15 | 188,958 | -73.6% | 64,315 | 2.94 |
| 2025-09-30 | 715,195 | +28.8% | 181,681 | 3.94 |
| 2025-09-15 | 555,472 | +3.0% | 140,883 | 3.94 |
| 2025-08-29 | 539,256 | +13.4% | 160,316 | 3.36 |
Daily short volume
FINRA Reg SHO, last 60 sessions. JSONAs of 11 September 2026, the short share of SI volume is 80.6%, up 21.4 points over the last five sessions. Over the last 52 readings it ranged from 11.5% (4 August 2026) to 90.3% (31 August 2026). The latest reading is 21.2 points above the 30-session average of 59.4%, on 38K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-09-11 | 31K | 38K | 80.6% | 0 |
| 2026-09-10 | 13K | 17K | 77.9% | 0 |
| 2026-09-09 | 32K | 46K | 70.0% | 0 |
| 2026-09-08 | 37K | 49K | 76.9% | 0 |
| 2026-09-04 | 16K | 33K | 48.4% | 0 |
| 2026-09-03 | 6K | 11K | 59.2% | 0 |
| 2026-09-02 | 17K | 27K | 61.1% | 0 |
| 2026-09-01 | 24K | 36K | 66.1% | 0 |
| 2026-08-31 | 13K | 15K | 90.3% | 0 |
| 2026-08-28 | 14K | 18K | 77.2% | 0 |
| 2026-08-27 | 30K | 34K | 89.7% | 0 |
| 2026-08-26 | 45K | 54K | 83.9% | 0 |
| 2026-08-25 | 25K | 29K | 85.7% | 0 |
| 2026-08-24 | 20K | 23K | 89.9% | 0 |
| 2026-08-21 | 18K | 29K | 62.1% | 0 |
| 2026-08-20 | 11K | 25K | 44.9% | 0 |
| 2026-08-19 | 17K | 39K | 42.9% | 0 |
| 2026-08-18 | 19K | 27K | 70.7% | 0 |
| 2026-08-17 | 18K | 29K | 63.3% | 6,300 |
| 2026-08-14 | 18K | 40K | 45.3% | 0 |
| 2026-08-13 | 16K | 28K | 54.7% | 0 |
| 2026-08-12 | 23K | 40K | 56.1% | 1,802 |
| 2026-08-11 | 21K | 74K | 28.2% | 0 |
| 2026-08-10 | 25K | 54K | 47.2% | 27 |
| 2026-08-07 | 53K | 114K | 46.6% | 740 |
| 2026-08-06 | 5K | 11K | 47.0% | 0 |
| 2026-08-05 | 7K | 19K | 35.1% | 0 |
| 2026-08-04 | 11K | 99K | 11.5% | 0 |
| 2026-08-03 | 7K | 19K | 36.6% | 0 |
| 2026-07-31 | 7K | 21K | 32.2% | 0 |
Fails to deliver
SEC, by settlement date. JSONAs of 13 August 2026, the fails-to-deliver balance in SI is 4,567 shares, up 4,267 shares over the last settlement date. Over the last 52 readings it ranged from 15 shares (18 June 2026) to 78,817 shares (5 August 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-08-13 | 4,567 | $19.34 | $88K |
| 2026-08-10 | 300 | $20.59 | $6K |
| 2026-08-06 | 76,718 | $22.60 | $1.7M |
| 2026-08-05 | 78,817 | $22.69 | $1.8M |
| 2026-07-31 | 1,152 | $23.19 | $27K |
| 2026-07-30 | 1,000 | $23.72 | $24K |
| 2026-07-27 | 15 | $20.41 | $306 |
| 2026-07-17 | 32 | $22.53 | $721 |
| 2026-07-01 | 97 | $20.28 | $2K |
| 2026-06-30 | 77 | $21.09 | $2K |
| 2026-06-18 | 15 | $17.97 | $270 |
| 2026-04-30 | 2,604 | $12.28 | $32K |
| 2026-04-24 | 102 | $13.07 | $1K |
| 2026-04-21 | 1,064 | $14.90 | $16K |
| 2026-03-26 | 10,834 | $14.40 | $156K |
| 2026-03-25 | 18,101 | $14.60 | $264K |
| 2026-03-24 | 19,828 | $14.41 | $286K |
| 2026-03-23 | 21,467 | $14.30 | $307K |
| 2026-03-20 | 2,929 | $15.05 | $44K |
| 2026-03-19 | 4,857 | $15.22 | $74K |
| 2026-03-18 | 2,753 | $15.12 | $42K |
| 2026-03-17 | 2,753 | $15.28 | $42K |
| 2026-03-16 | 2,953 | $14.82 | $44K |
| 2026-03-13 | 5,253 | $14.62 | $77K |
| 2026-03-12 | 6,348 | $14.01 | $89K |
| 2026-03-11 | 6,200 | $13.05 | $81K |
| 2026-03-10 | 6,627 | $13.39 | $89K |
| 2026-03-09 | 13,974 | $13.01 | $182K |
| 2026-03-06 | 6,674 | $13.03 | $87K |
| 2026-03-05 | 7,400 | $13.11 | $97K |
Insider trades
SEC Form 4, newest first, 50 of 51 shown. JSONInsiders at SI reported 14 open-market sells worth $5.0M 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: Gilde Healthcare Holding B.V. on 2026-08-24.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-08-24 | Gilde Healthcare Holding B.V. | n/a | Sell | 681 | $22.62 | $15K | 2.2M |
| 2026-08-21 | Gilde Healthcare Holding B.V. | n/a | Sell | 21K | $22.61 | $464K | 2.2M |
| 2026-08-20 | Gilde Healthcare Holding B.V. | n/a | Sell | 4K | $22.60 | $88K | 2.2M |
| 2026-08-18 | Ahearn Matthew Fraser | Chief Operating Officer | Sell | 2K | $21.38 | $34K | 244K |
| 2026-08-18 | Ahearn Matthew Fraser | Chief Operating Officer | Sell | 13K | $20.94 | $263K | 246K |
| 2026-08-17 | Ahearn Matthew Fraser | Chief Operating Officer | Sell | 8K | $20.10 | $167K | 258K |
| 2026-08-14 | Ahearn Matthew Fraser | Chief Operating Officer | Gift | 3K | $0.00 | $0 | 267K |
| 2026-08-06 | Gilde Healthcare Holding B.V. | n/a | Sell | 2K | $22.60 | $47K | 2.2M |
| 2026-08-05 | Gilde Healthcare Holding B.V. | n/a | Sell | 7K | $22.64 | $166K | 2.2M |
| 2026-08-04 | Gilde Healthcare Holding B.V. | n/a | Sell | 100K | $22.77 | $2.3M | 2.2M |
| 2026-08-03 | Gilde Healthcare Holding B.V. | n/a | Sell | 11K | $22.71 | $244K | 2.3M |
| 2026-07-31 | Gilde Healthcare Holding B.V. | n/a | Sell | 20K | $22.73 | $455K | 2.3M |
| 2026-07-30 | Gilde Healthcare Holding B.V. | n/a | Sell | 28K | $23.36 | $660K | 2.4M |
| 2026-06-26 | Buchholz Richard | n/a | Grant | 5K | $0.00 | $0 | 19K |
| 2026-06-26 | BUCKMAN PAUL | n/a | Grant | 5K | $0.00 | $0 | 64K |
| 2026-06-15 | Ahearn Matthew Fraser | Chief Operating Officer | Sell | 3K | $19.26 | $48K | 269K |
| 2026-06-15 | Ahearn Matthew Fraser | Chief Operating Officer | Sell | 2K | $18.20 | $30K | 272K |
| 2026-06-12 | Ahearn Matthew Fraser | Chief Operating Officer | Sell | 16K | $18.68 | $296K | 273K |
| 2026-04-30 | Ball Robert Joseph | CEO & Executive Chairman | Option exercise | 10K | $2.48 | $25K | 300K |
| 2026-04-20 | Ahearn Matthew Fraser | Chief Operating Officer | Option exercise | 14K | $2.86 | $41K | 287K |
| 2026-04-20 | Ahearn Matthew Fraser | Chief Operating Officer | Option exercise | 7K | $2.48 | $18K | 273K |
| 2026-03-13 | Points Jeffrey S. | Chief Financial Officer | Buy | 2K | $15.00 | $30K | 71K |
| 2026-03-13 | Points Jeffrey S. | Chief Financial Officer | Option exercise | 13K | $2.48 | $33K | 69K |
| 2026-03-13 | Buchholz Richard | n/a | Buy | 1K | $14.84 | $15K | 14K |
| 2026-03-13 | Ball Robert Joseph | CEO & Executive Chairman | Buy | 2K | $15.18 | $33K | 279K |
| 2026-03-13 | BUCKMAN PAUL | n/a | Tax withholding | 4K | $14.82 | $55K | 59K |
| 2026-03-13 | BUCKMAN PAUL | n/a | Tax withholding | 3K | $14.62 | $48K | 62K |
| 2026-03-13 | BUCKMAN PAUL | n/a | Option exercise | 26K | $2.10 | $55K | 66K |
| 2026-03-13 | BUCKMAN PAUL | n/a | Option exercise | 19K | $2.48 | $48K | 40K |
| 2026-02-06 | Ball Robert Joseph | CEO & Executive Chairman | Option exercise | 2K | $2.10 | $4K | 277K |
| 2026-02-06 | Ball Robert Joseph | CEO & Executive Chairman | Option exercise | 10K | $2.48 | $25K | 275K |
| 2025-12-31 | Points Jeffrey S. | Chief Financial Officer | Grant | 1K | $12.16 | $13K | 56K |
| 2025-12-31 | Blue David Lawrence | See Remarks | Grant | 1K | $12.16 | $13K | 139K |
| 2025-12-31 | Ball Robert Joseph | CEO & Executive Chairman | Grant | 2K | $12.16 | $20K | 120K |
| 2025-12-31 | Ahearn Matthew Fraser | Chief Operating Officer | Grant | 477 | $12.16 | $6K | 216K |
| 2025-12-12 | Points Jeffrey S. | Chief Financial Officer | Buy | 1K | $14.98 | $15K | 54K |
| 2025-12-12 | Ball Robert Joseph | CEO & Executive Chairman | Buy | 4K | $14.89 | $58K | 118K |
| 2025-12-11 | Points Jeffrey S. | Chief Financial Officer | Buy | 995 | $14.65 | $15K | 53K |
| 2025-12-11 | Ball Robert Joseph | CEO & Executive Chairman | Buy | 3K | $14.83 | $49K | 115K |
| 2025-09-12 | Points Jeffrey S. | CHIEF FINANCIAL OFFICER | Buy | 2K | $15.67 | $25K | 52K |
| 2025-09-12 | Blue David Lawrence | SEE REMARKS | Option exercise | 16K | $2.48 | $39K | 138K |
| 2025-09-12 | Blue David Lawrence | SEE REMARKS | Option exercise | 79K | $2.10 | $165K | 123K |
| 2025-09-12 | Ball Robert Joseph | CEO & EXECUTIVE CHAIRMAN | Buy | 6K | $15.49 | $93K | 111K |
| 2025-09-11 | Points Jeffrey S. | CHIEF FINANCIAL OFFICER | Option exercise | 13K | $2.48 | $33K | 51K |
| 2025-09-11 | Ball Robert Joseph | CEO & EXECUTIVE CHAIRMAN | Buy | 2K | $14.90 | $30K | 105K |
| 2025-09-11 | Ahearn Matthew Fraser | CHIEF OPERATING OFFICER | Option exercise | 16K | $2.48 | $41K | 215K |
| 2025-09-11 | Ahearn Matthew Fraser | CHIEF OPERATING OFFICER | Option exercise | 79K | $2.10 | $165K | 199K |
| 2025-09-11 | Ahearn Matthew Fraser | CHIEF OPERATING OFFICER | Option exercise | 12K | $0.93 | $11K | 120K |
| 2025-08-01 | Points Jeffrey S. | CHIEF FINANCIAL OFFICER | Buy | 50 | $15.00 | $750 | 50 |
| 2025-08-01 | Buchholz Richard | n/a | Buy | 5K | $15.00 | $75K | 13K |
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.
Planned sales (Form 144)
Newest first. JSON2 Form 144 notices on file for SI worth $5.3M at the prices reported; 2 in the last 90 days worth $5.3M. Latest: MATTHEW AHEARN filed on 2026-08-17 to sell 22,500 shares ($466K) from 2026-08-17.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-08-17 | MATTHEW AHEARNDirector, Officer | 23K | $466K | 0.108% | 2026-08-17 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-07-29 | Gilde Healthcare Holding B.V.; Cooperatieve Gilde Healthcare V U.A.10% Stockholder | 200K | $4.8M | 0.964% | 2026-07-29 | Van Lanschot Kempen N.V. |
Large holders (13D and 13G)
One row per reporting person, newest filing first. JSON5 holders above 5% have filed on SI, 5 on Schedule 13D (active intent). The largest reported stake is Gilde Healthcare Holding B.V. at 10.7% of the class (2,212,207 shares), filed 2026-08-07 for an event on 2026-08-05.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-08-07 | 13D/Ano. 1 | Gilde Healthcare Holding B.V.other entity | 2.2M | 10.7% | 2026-08-05 |
| 2026-08-07 | 13D/Ano. 1 | Gilde Healthcare V Management B.V.other entity | 2.2M | 10.7% | 2026-08-05 |
| 2026-08-07 | 13D/Ano. 1 | Cooperatieve Gilde Healthcare V U.A.other entity | 2.2M | 10.7% | 2026-08-05 |
| 2026-08-07 | 13D/Ano. 1 | Manapouri B.V.other entity | 2.2M | 10.7% | 2026-08-05 |
| 2026-08-07 | 13D/Ano. 1 | Martemanshurk B.V.other entity | 2.2M | 10.7% | 2026-08-05 |
13F holders
Tracked managers holding SI at their latest 13F. JSON3 of the 30 tracked managers held SI at their latest 13F, $1.6M in total at quarter-end prices. Citadel Advisors is the largest at $746K (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 1 added shares and 0 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Citadel Advisors | 2026-06-30 | 37K | $746K | 0.00% | +23K |
| Point72 Asset Management | 2026-06-30 | 23K | $465K | 0.00% | new or n/a |
| AQR Capital Management | 2026-06-30 | 20K | $401K | 0.00% | new or n/a |
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.
What this page is
SHOULDER INNOVATIONS, INC. 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 SHOULDER INNOVATIONS, INC. (SI), SEC CIK 1699350, listed on NYSE. 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 2026-08-14.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesEvery trading day, loaded the following morning. Latest 2026-09-11.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataTwice a month, a few weeks after the half month ends. Latest 2026-08-13.JSON and CSV
- Planned sales
- SEC EDGAR Form 144EDGAR read every 30 minutes; a notice is filed on or before the sell order. Latest 2026-08-17.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 2026-08-07.JSON and CSV
- 13F holders
- SEC EDGAR Form 13F-HRQuarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
- Insider trades
- SEC EDGAR Form 4EDGAR read every 30 minutes; filings are due two business days after the trade. Latest 2026-08-24.JSON and CSV
- Company record
- EDGAR filing index for CIK 1699350Ticker, 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, 12 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.
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Datasets
Frequently Asked Questions
How much of SI is sold short?
What is SI's daily short volume?
Does SI have fails to deliver?
Are SI insiders buying or selling?
Have SI insiders filed to sell?
Who owns more than 5% of SI?
Which funds hold SI?
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.