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PI

Paul J. Isaac

STXS
DIRECTOR · STEREOTAXIS, INC. · CIK 0001023009
FILING MIX · LIFETIME66%/34%
BUYS
49
SELLS
25
TOTAL VALUE
$17.48M
COMPANIES
1
ACTIVE SINCE
Jun 2020
HOLDINGS NOW
97,299
AVG SELL PX
$6.83
TRADE KIND
SHOWING 74 / 74
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
74 backtested trades · 8 horizons · 10 pendingHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by Paul J. Isaac, 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
7d74+78.38%+2.51%+0.61%+1.90%+2.63%1.86
14d74+75.68%+4.03%+1.67%+2.37%+1.45%1.84
30d74+77.03%-1.51%+1.22%-2.73%-0.82%-1.69
60d74+72.97%+1.09%+3.02%-1.93%-3.96%-0.79
90d74+79.73%+11.23%+6.71%+4.52%-3.13%1.14
180d74+63.51%+28.66%+13.68%+14.98%+8.97%5.05
1y74(2 pending)+58.33%+51.15%+26.38%+24.77%+8.43%5.70
2y74(8 pending)+98.48%+5.86%+37.36%-31.36%-21.42%-5.90
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
STXS · 97,299 shares · as of Nov 17, 2025
01,142,6222,285,2453,427,8674,570,48920212022202320242025SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2020
2020
2020
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
FLOW · 49 buys / 25 sellsCOVERAGE · 23 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
STXS
STEREOTAXIS, INC.
PURCHASE
10,000$2.18$21.8K97,299Nov 17, 2025Nov 18, 2025 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
20,000$2.24$44.8K2,786,557Nov 14, 2025Nov 18, 2025 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
38,000$1.81$68.8K87,299Mar 10, 2025Mar 11, 2025 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
1,489$1.79$2.7K2,766,557Mar 7, 2025Mar 10, 2025 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
23,299$1.81$42.2K49,066Mar 6, 2025Mar 10, 2025 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
442$1.88$8312,768,068Aug 20, 2024Aug 21, 2024 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
812$1.88$1.5K2,767,626Aug 19, 2024Aug 21, 2024 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
8,095$1.90$15.3K2,766,814Aug 15, 2024Aug 19, 2024 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
7,000$1.86$13.0K2,765,719Jun 14, 2024Jun 17, 2024 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
1,000$1.96$2.0K2,758,719May 31, 2024Jun 4, 2024 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
3,026$1.90$5.7K2,748,719May 29, 2024May 30, 2024 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
6,000$1.91$11.4K2,745,693May 28, 2024May 30, 2024 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
11,060$1.72$19.0K2,739,693Dec 15, 2023Dec 18, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
2,808$1.56$4.4K2,728,633Nov 30, 2023Dec 5, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
18$1.50$272,725,825Nov 22, 2023Nov 24, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
6,000$1.53$9.2K2,725,807Nov 21, 2023Nov 24, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
6,000$1.54$9.2K2,719,807Nov 20, 2023Nov 21, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
6,000$1.55$9.3K2,713,807Nov 17, 2023Nov 21, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
15,000$1.51$22.6K2,707,807Nov 16, 2023Nov 17, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
20,000$1.44$28.8K2,692,807Nov 15, 2023Nov 17, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
10,000$1.45$14.5K2,672,807Nov 14, 2023Nov 15, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
10,000$1.44$14.4K2,662,807Nov 13, 2023Nov 15, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
16,000$1.63$26.1K2,652,807Sep 15, 2023Sep 18, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
7,168$1.65$11.8K2,636,807Sep 14, 2023Sep 18, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
6,305$1.68$10.6K2,629,639Sep 13, 2023Sep 14, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
1,200$1.68$2.0K2,623,334Sep 12, 2023Sep 14, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
10,000$1.71$17.1K2,622,134Aug 30, 2023Sep 1, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
6,739$1.70$11.5K2,612,134Aug 29, 2023Aug 30, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
9,311$1.71$15.9K2,605,395Aug 28, 2023Aug 30, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
5,000$1.71$8.6K2,596,084Aug 25, 2023Aug 28, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
4,000$1.78$7.1K2,591,084Aug 24, 2023Aug 28, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
6,000$1.75$10.5K2,587,084Aug 22, 2023Aug 23, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
6,198$1.64$10.2K2,581,084Aug 21, 2023Aug 23, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
6,000$1.54$9.2K2,574,886Aug 17, 2023Aug 18, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
4,685$1.54$7.2K2,568,886Aug 16, 2023Aug 18, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
16,687$1.51$25.2K2,564,201Aug 15, 2023Aug 16, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
400$1.51$6042,547,514Aug 14, 2023Aug 16, 2023 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
2,100$1.85$3.9K2,528,583May 26, 2022Jun 1, 2022 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
12,200$1.81$22.1K2,526,483May 25, 2022Jun 1, 2022 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
9,992$1.80$18.0K2,514,283May 24, 2022May 25, 2022 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
4,300$1.86$8.0K2,504,291May 23, 2022May 25, 2022 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
28,440$1.80$51.2K2,499,991May 20, 2022May 23, 2022 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
14,823$1.79$26.5K2,471,551May 19, 2022May 23, 2022 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
26,287$1.82$47.8K2,456,728May 18, 2022May 19, 2022 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
9,500$1.81$17.2K2,430,441May 16, 2022May 19, 2022 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
19,238$1.82$35.0K2,420,941May 16, 2022May 19, 2022 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
35,000$1.88$65.8K2,401,703May 13, 2022May 16, 2022 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
70,000$1.86$130.2K2,366,703May 13, 2022May 16, 2022 ↗View →
STXS
STEREOTAXIS, INC.
PURCHASE
51,751$1.76$91.1K2,296,703May 12, 2022May 16, 2022 ↗View →
STXS
STEREOTAXIS, INC.
SALE
2,000,000$7.25$14.50M2,208,952Jun 1, 2021Jun 3, 2021 ↗View →
STXS
STEREOTAXIS, INC.
SALE
14,927$4.15$61.9K4,208,952Sep 16, 2020Sep 18, 2020 ↗View →
STXS
STEREOTAXIS, INC.
SALE
100$4.10$4104,223,879Jul 23, 2020Jul 24, 2020 ↗View →
STXS
STEREOTAXIS, INC.
SALE
5,200$4.13$21.5K4,223,979Jul 22, 2020Jul 24, 2020 ↗View →
STXS
STEREOTAXIS, INC.
SALE
6,388$4.20$26.8K4,229,179Jul 21, 2020Jul 21, 2020 ↗View →
STXS
STEREOTAXIS, INC.
SALE
7,346$4.22$31.0K4,235,567Jul 20, 2020Jul 21, 2020 ↗View →
STXS
STEREOTAXIS, INC.
SALE
9,214$4.24$39.1K4,242,913Jul 17, 2020Jul 21, 2020 ↗View →
STXS
STEREOTAXIS, INC.
SALE
7,491$4.31$32.3K4,252,127Jul 16, 2020Jul 17, 2020 ↗View →
STXS
STEREOTAXIS, INC.
SALE
12,058$4.56$55.0K4,259,618Jul 15, 2020Jul 17, 2020 ↗View →
STXS
STEREOTAXIS, INC.
SALE
16,514$4.38$72.3K4,271,676Jul 14, 2020Jul 14, 2020 ↗View →
STXS
STEREOTAXIS, INC.
SALE
23,818$4.23$100.8K4,288,190Jul 13, 2020Jul 14, 2020 ↗View →
STXS
STEREOTAXIS, INC.
SALE
2,450$4.14$10.1K4,312,008Jul 10, 2020Jul 14, 2020 ↗View →
STXS
STEREOTAXIS, INC.
SALE
11,448$4.17$47.7K4,314,458Jul 9, 2020Jul 9, 2020 ↗View →
STXS
STEREOTAXIS, INC.
SALE
14,981$4.25$63.7K4,325,906Jul 8, 2020Jul 9, 2020 ↗View →
STXS
STEREOTAXIS, INC.
SALE
11,128$4.35$48.4K4,340,887Jul 7, 2020Jul 9, 2020 ↗View →
STXS
STEREOTAXIS, INC.
SALE
10,105$4.39$44.4K4,352,015Jul 6, 2020Jul 7, 2020 ↗View →
STXS
STEREOTAXIS, INC.
SALE
7,992$4.36$34.8K4,362,120Jul 2, 2020Jul 7, 2020 ↗View →
STXS
STEREOTAXIS, INC.
SALE
13,463$4.51$60.7K4,370,112Jul 1, 2020Jul 2, 2020 ↗View →
STXS
STEREOTAXIS, INC.
SALE
13,963$4.51$63.0K4,383,575Jun 30, 2020Jul 1, 2020 ↗View →
STXS
STEREOTAXIS, INC.
SALE
13,398$4.49$60.2K4,397,538Jun 29, 2020Jul 1, 2020 ↗View →
STXS
STEREOTAXIS, INC.
SALE
38,574$4.66$179.8K4,410,936Jun 26, 2020Jun 30, 2020 ↗View →
STXS
STEREOTAXIS, INC.
SALE
44,294$5.11$226.3K4,449,510Jun 25, 2020Jun 26, 2020 ↗View →
STXS
STEREOTAXIS, INC.
SALE
36,999$5.25$194.2K4,493,804Jun 24, 2020Jun 26, 2020 ↗View →
STXS
STEREOTAXIS, INC.
SALE
39,686$5.22$207.2K4,530,803Jun 23, 2020Jun 24, 2020 ↗View →
STXS
STEREOTAXIS, INC.
SALE
44,896$5.42$243.3K4,570,489Jun 22, 2020Jun 24, 2020 ↗View →
Other insiders · STXS
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About this filer
CIK 0001023009
ROLE
Director
PRIMARY
STXS
COMPANIES
1
ACTIVE SINCE
Jun 2020
MARKETPEEL · /INSIDER/0001023009DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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