First Form 4 purchase or sale (code P or S) here by this insider on our record.
The trade is 0.1% of the 633,000 shares held after it.
No other insider bought within 30 days.
5 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Chairman and President MELNIK SERGUEI bought about $2.0K of NTRB on Feb 24, 2022, the largest insider purchase at the company on our record; 5 funds added in the latest 13F quarter.
First Form 4 purchase or sale (code P or S) here by this insider on our record.
The trade is 0.1% of the 633,000 shares held after it.
No other insider bought within 30 days.
5 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Chairman and President MELNIK SERGUEI bought about $2.0K of NTRB on Feb 24, 2022, the largest insider purchase at the company on our record; 5 funds added in the latest 13F quarter.
First Form 4 purchase or sale (code P or S) here by this insider on our record.
The trade is 0.8% of the 637,500 shares held after it.
No other insider bought within 30 days.
5 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Chairman and President MELNIK SERGUEI bought about $20.1K of NTRB on Feb 24, 2022, the largest insider purchase at the company on our record; 5 funds added in the latest 13F quarter.
3 transactions on record · a thin record, read with care
Since filing: total return from the first close after the filing to the latest close, dividend-adjusted. Not a forecast.
Context lines are counts over the filings above and returns from our own price history, never a price level. Not investment advice.
Ratios from the company's XBRL filings, latest filings
Revenue, TTM
$1.6M
four quarters, 2025-08-01 to 2026-07-31
Revenue, TTM NTRB
FY Jan 2026
$2.0M
FY Jan 2025
$2.1M
FY Jan 2024
$2.1M
FY Jan 2023
$2.1M
FY Jan 2022
$1.4M
Jul 2026
$437.5K
Apr 2026
$433.4K
Jan 2026
$400.7K
Oct 2025
$346.1K
Jul 2025
$622.5K
Apr 2025
$667.4K
Jan 2025
$642.4K
Oct 2024
$645.8K
At each fiscal year end
Single quarter
Net margin, TTM
-430.4%
net income over revenue, 2025-08-01 to 2026-07-31
Net margin, TTM NTRB
FY Jan 2026
-404.1%
FY Jan 2025
-489.9%
FY Jan 2024
-263.0%
FY Jan 2023
-215.6%
FY Jan 2022
-434.3%
Jul 2026
-201.3%
Apr 2026
-286.6%
Jan 2026
-241.6%
Oct 2025
-1,119%
Jul 2025
-321.4%
Apr 2025
-208.1%
Jan 2025
-858.8%
Oct 2024
-211.0%
At each fiscal year end
Single quarter
Free cash flow, TTM
-$3.6M
operating cash flow minus capex, 2025-08-01 to 2026-07-31
Free cash flow, TTM NTRB
FY Jan 2026
-$5.1M
FY Jan 2025
-$4.7M
FY Jan 2024
-$3.6M
FY Jan 2023
-$3.1M
FY Jan 2022
-$2.9M
Jul 2026
n/a
Apr 2026
n/a
Jan 2026
-$731.8K
Oct 2025
-$1.8M
Jul 2025
-$1.3M
Apr 2025
-$1.3M
Jan 2025
-$1.2M
Oct 2024
-$1.1M
At each fiscal year end
Single quarter
Debt to equity
0.38x
long-term 2018-01-31 (103 months older than the period end) plus current 2024-01-31 (30 months older than the period end); equity 2026-07-31
Debt to equity NTRB
FY Jan 2026
0.30x
FY Jan 2025
0.31x
FY Jan 2024
0.31x
FY Jan 2023
0.00x
FY Jan 2022
0.00x
Jul 2026
0.38x
Apr 2026
0.33x
Jan 2026
0.30x
Oct 2025
0.27x
Jul 2025
0.24x
Apr 2025
0.39x
Jan 2025
0.31x
Oct 2024
0.18x
At each fiscal year end
Trailing four quarters at each quarter end
Cash flow to debt
-1.81x
TTM operating cash flow over long-term 2018-01-31 (103 months older than the period end) plus current 2024-01-31 (30 months older than the period end)
Cash flow to debt NTRB
FY Jan 2026
-2.56x
FY Jan 2025
-2.31x
FY Jan 2024
-1.76x
FY Jan 2023
-1,641.32x
FY Jan 2022
-1,543.53x
Jul 2026
-1.81x
Apr 2026
-2.18x
Jan 2026
-2.56x
Oct 2025
-2.82x
Jul 2025
-2.45x
Apr 2025
-2.56x
Jan 2025
-2.31x
Oct 2024
-2.05x
At each fiscal year end
Trailing four quarters at each quarter end
Return on equity
-100.7%
TTM net income over average of 2025-07-31 and 2026-07-31
Return on equity NTRB
FY Jan 2026
-125.6%
FY Jan 2025
-162.9%
FY Jan 2024
-73.1%
FY Jan 2023
-43.9%
FY Jan 2022
-65.1%
Jul 2026
-100.7%
Apr 2026
-145.7%
Jan 2026
-125.6%
Oct 2025
-136.1%
Jul 2025
-98.0%
Apr 2025
-108.0%
Jan 2025
-162.9%
Oct 2024
-80.8%
At each fiscal year end
Trailing four quarters at each quarter end
Return on assets
-84.6%
TTM net income over average of 2025-07-31 and 2026-07-31
Return on assets NTRB
FY Jan 2026
-109.6%
FY Jan 2025
-139.9%
FY Jan 2024
-64.6%
FY Jan 2023
-40.4%
FY Jan 2022
-54.5%
Jul 2026
-84.6%
Apr 2026
-123.9%
Jan 2026
-109.6%
Oct 2025
-121.9%
Jul 2025
-86.3%
Apr 2025
-93.6%
Jan 2025
-139.9%
Oct 2024
-65.0%
At each fiscal year end
Trailing four quarters at each quarter end
Return on invested capital
n/a
tax provision or pre-tax income not filed for the four quarters
Return on invested capital NTRB
FY Jan 2026
n/a
FY Jan 2025
n/a
FY Jan 2024
n/a
FY Jan 2023
n/a
FY Jan 2022
n/a
Jul 2026
n/a
Apr 2026
n/a
Jan 2026
n/a
Oct 2025
n/a
Jul 2025
n/a
Apr 2025
n/a
Jan 2025
n/a
Oct 2024
n/a
At each fiscal year end
Trailing four quarters at each quarter end
Return on capital employed
-100.7%
operating income (EBIT proxy) over average of 2025-07-31 and 2026-07-31 minus current liabilities
Return on capital employed NTRB
FY Jan 2026
-125.5%
FY Jan 2025
-158.2%
FY Jan 2024
-64.0%
FY Jan 2023
-43.3%
FY Jan 2022
-63.3%
Jul 2026
-100.7%
Apr 2026
-144.6%
Jan 2026
-125.5%
Oct 2025
-135.7%
Jul 2025
-98.4%
Apr 2025
-103.4%
Jan 2025
-158.2%
Oct 2024
-63.2%
At each fiscal year end
Trailing four quarters at each quarter end
P/E, trailing
n/a
trailing loss, a multiple of a loss is not meaningful
P/E, trailing NTRB
FY Jan 2026
n/a
FY Jan 2025
n/a
FY Jan 2024
n/a
FY Jan 2023
n/a
FY Jan 2022
n/a
Jul 2026
n/a
Apr 2026
n/a
Jan 2026
n/a
Oct 2025
n/a
Jul 2025
n/a
Apr 2025
n/a
Jan 2025
n/a
Oct 2024
n/a
At each fiscal year end
Trailing four quarters at each quarter end
Enterprise value
$71.1M
market value at close 2026-10-26 on 2026-09-04 shares, plus long-term 2018-01-31 (103 months older than the period end) plus current 2024-01-31 (30 months older than the period end), minus cash 2026-07-31
Enterprise value NTRB
FY Jan 2026
$55.7M
FY Jan 2025
$89.8M
FY Jan 2024
$22.0M
FY Jan 2023
$26.6M
FY Jan 2022
$24.2M
Jul 2026
$33.2M
Apr 2026
$45.0M
Jan 2026
$55.7M
Oct 2025
$77.7M
Jul 2025
$75.4M
Apr 2025
$75.8M
Jan 2025
$89.8M
Oct 2024
$65.0M
At each fiscal year end
Trailing four quarters at each quarter end
FCF yield
-5.0%
TTM free cash flow over market value at close 2026-10-26
FCF yield NTRB
FY Jan 2026
-8.8%
FY Jan 2025
-5.1%
FY Jan 2024
-17.5%
FY Jan 2023
-10.7%
FY Jan 2022
-9.9%
Jul 2026
-10.5%
Apr 2026
-9.3%
Jan 2026
-8.8%
Oct 2025
-7.0%
Jul 2025
-6.2%
Apr 2025
-6.8%
Jan 2025
-5.1%
Oct 2024
-6.2%
At each fiscal year end
Trailing four quarters at each quarter end
PEG, trailing
n/a
trailing loss, a multiple of a loss is not meaningful
PEG, trailing NTRB
FY Jan 2026
n/a
FY Jan 2025
n/a
FY Jan 2024
n/a
FY Jan 2023
n/a
FY Jan 2022
n/a
Jul 2026
n/a
Apr 2026
n/a
Jan 2026
n/a
Oct 2025
n/a
Jul 2025
n/a
Apr 2025
n/a
Jan 2025
n/a
Oct 2024
n/a
At each fiscal year end
Trailing four quarters at each quarter end
Price as of 2026-10-26. Hover or tap a tile for its yearly and quarterly history.Method
TTM is four consecutive fiscal quarters; Q4 is the year minus nine months when not filed. Returns use the average of opening and closing balances. EBIT is approximated by operating income. PEG uses trailing EPS growth.
Fundamentals
Annual figures from XBRL filings. Pick a past date to see them as known then.
NTRB ranks highest on risk and compliance (75th percentile) and financial health (34th), and lowest on institutional and government (3rd), among Medical Devices peers.
Profitability
22
Inputs
Return on equity-100.7% · 25 pct, sector of 183
Return on assets-84.6% · 22 pct, sector of 214
Return on invested capitaltax provision or pre-tax income not filed for the four quarters
Return on capital employed-100.7% · 18 pct, sector of 188
Financial health
34
Inputs
Debt to equity0.38x · 42 pct, sector of 159
Cash flow to debt-1.81x · 25 pct, sector of 150
Growth
17
Inputs
Revenue growth, YoY-4.8% · 17 pct, sector of 219
Backlog growth, YoYno backlog line filed, or no year-earlier backlog
Institutional and government
3
Inputs
Funds adding, latest quarter5 · 3 pct, sector of 191
Congress net buyers, 365dno Congress trades in 365 days
Federal contracts, 180dno federal contracts in 180 days
Lobbying spend, 4 quartersno lobbying filings in the last four quarters
Risk and compliance
75
Inputs
Short interest, % of float+2.9% · 66 pct, sector of 240
Recalls per $1B revenue, 3yrevenue under $50M or not filed, so a count cannot be scaled to size
EPA cases per $1B revenue, 5yrevenue under $50M or not filed, so a count cannot be scaled to size
New text in Risk Factors, latest 10-K+4.5% · 85 pct, sector of 198
2 not measured: Insider conviction, US patents
Insider conviction needs 1 of 2 inputs, 0 present: no Form 4 purchase or sale (code P or S) in 180 days; no insider trades in 180 days
US patents needs 1 of 2 inputs, 0 present: patent data not loaded yet
5 of 7 axes scored. Each is a percentile against sector peers (all companies when the sector is thin); higher is better. An unscored axis is unmeasured, not low. How it is scored
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