MarketPeel
Insider Trading Intelligence
RB

Robert Joseph Ball

SI
CEO & EXECUTIVE CHAIRMAN · SHOULDER INNOVATIONS, INC. · CIK 0002070664
FILING MIX · LIFETIME58%/42%
BUYS
11
SELLS
8
TOTAL VALUE
$337.3K
COMPANIES
1
ACTIVE SINCE
Aug 2025
HOLDINGS NOW
309,756
AVG SELL PX
TRADE KIND
SHOWING 19 / 19
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
5 backtested trades · 8 horizons · 11 pending
Forward-return performance of every backtestable P/S trade by Robert Joseph Ball, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.
HORIZONTRADESWIN RATEINSIDER RETURNSPY RETURNMEAN EXCESSMEDIAN EXCESST-STAT
7d5+40.00%-1.41%-0.48%-0.92%-1.44%
14d5+40.00%-7.53%-0.42%-7.11%-2.22%
30d5+0.00%-9.03%+1.28%-10.31%-4.39%
60d5+0.00%-17.01%+4.24%-21.25%-21.24%
90d5+40.00%-1.46%+2.95%-4.41%-5.82%
180d5(1 pending)+25.00%-5.41%+5.31%-10.71%-12.69%
1y5(5 pending)
2y5(5 pending)
How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.
Holdings over time
SI · 309,756 shares · as of Apr 30, 2026
079,939159,878239,817319,7562026SHARES HELD
Trading cadence · quarterly flow
BUY SELL
2025
2025
2026
2026
FLOW · 11 buys / 8 sellsCOVERAGE · 4 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
SI
SHOULDER INNOVATIONS, INC.
PURCHASE
CEO & Executive Chairman
10,000$2.48$24.8K300,018Apr 30, 2026Apr 30, 2026View →
SI
SHOULDER INNOVATIONS, INC.
SALE
CEO & Executive Chairman
10,000309,756Apr 30, 2026Apr 30, 2026View →
SI
SHOULDER INNOVATIONS, INC.
PURCHASE
CEO & Executive Chairman
2,200$15.18$33.4K278,866Mar 13, 2026Mar 17, 2026View →
SI
SHOULDER INNOVATIONS, INC.
PURCHASE
CEO & Executive Chairman
2,062$2.10$4.3K276,666Feb 6, 2026Feb 10, 2026View →
SI
SHOULDER INNOVATIONS, INC.
SALE
CEO & Executive Chairman
10,000319,756Feb 6, 2026Feb 10, 2026View →
SI
SHOULDER INNOVATIONS, INC.
SALE
CEO & Executive Chairman
2,062181,376Feb 6, 2026Feb 10, 2026View →
SI
SHOULDER INNOVATIONS, INC.
PURCHASE
CEO & Executive Chairman
10,000$2.48$24.8K274,604Feb 6, 2026Feb 10, 2026View →
SI
SHOULDER INNOVATIONS, INC.
PURCHASEGRANT
Stock grant
265,351265,351Jan 30, 2026Feb 3, 2026View →
SI
SHOULDER INNOVATIONS, INC.
PURCHASEGRANT
Stock grant
1,661$12.16$20.2K120,118Dec 31, 2025Jan 8, 2026View →
SI
SHOULDER INNOVATIONS, INC.
PURCHASE
CEO & Executive Chairman
3,900$14.89$58.1K118,457Dec 12, 2025Dec 15, 2025View →
SI
SHOULDER INNOVATIONS, INC.
PURCHASE
CEO & Executive Chairman
3,300$14.83$48.9K114,557Dec 11, 2025Dec 15, 2025View →
SI
SHOULDER INNOVATIONS, INC.
PURCHASE
CEO & EXECUTIVE CHAIRMAN
6,000$15.49$92.9K111,259Sep 12, 2025Sep 15, 2025View →
SI
SHOULDER INNOVATIONS, INC.
PURCHASE
CEO & EXECUTIVE CHAIRMAN
2,000$14.90$29.8K105,259Sep 11, 2025Sep 15, 2025View →
SI
SHOULDER INNOVATIONS, INC.
PURCHASE
CEO & EXECUTIVE CHAIRMAN
85,888103,259Aug 1, 2025Aug 5, 2025View →
SI
SHOULDER INNOVATIONS, INC.
SALE
CEO & EXECUTIVE CHAIRMAN
706,5720Aug 1, 2025Aug 5, 2025View →
SI
SHOULDER INNOVATIONS, INC.
SALE
CEO & EXECUTIVE CHAIRMAN
146,4590Aug 1, 2025Aug 5, 2025View →
SI
SHOULDER INNOVATIONS, INC.
SALE
CEO & EXECUTIVE CHAIRMAN
222,3040Aug 1, 2025Aug 5, 2025View →
SI
SHOULDER INNOVATIONS, INC.
SALE
CEO & EXECUTIVE CHAIRMAN
176,0860Aug 1, 2025Aug 5, 2025View →
SI
SHOULDER INNOVATIONS, INC.
SALE
CEO & EXECUTIVE CHAIRMAN
387,3460Aug 1, 2025Aug 5, 2025View →
Other insiders · SI
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About this filer
CIK 0002070664
ROLE
CEO & Executive Chairman
PRIMARY
SI
COMPANIES
1
ACTIVE SINCE
Aug 2025
MARKETPEEL · /INSIDER/0002070664DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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