MASI
+$0
1,225 sh
Scannell Timothy J
Director, Chief Human Resources Officer, CEO, EVP & Chief Financial Officer, Chief Commerical Officer, Chief Marketing Officer, EVP, Operations, EVP, General Counsel, EVP, Ops & Clinical Research, CTIO & EVP of Engineering, COO, Consumer Division · SEC CIK 937556
Insider at
MASI MASIMO CORP
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Buy track record
How this insider's open-market purchases have performed100%
of buys now in profit
3 up · 0 down
Avg return since buy+19.1%
Median return+19.9%
Best trade+22.1%
Worst trade+15.4%
Buys scored3
Average return by holding period — separates good entry timing from riding one long winner
After 1 month
−3.0%
0% won · 3 trades
After 3 months
−1.0%
0% won · 3 trades
After 6 months
−12.1%
0% won · 3 trades
After 12 months
—
not elapsed yet
| Date | Company | 90d trend | Buy price | Value | ΔOwn | 1M | 3M | 6M | 12M | To date |
|---|---|---|---|---|---|---|---|---|---|---|
| Aug 13, 2025 | MASI | $155 | $15.5K | +1.4% | −6.6% | −2.3% | −16.5% | — | +15.4% | |
| Aug 12, 2025 | MASI | $150 | $15K | +1.4% | −1.8% | −0.2% | −11.4% | — | +19.9% | |
| Aug 11, 2025 | MASI | $146 | $437.9K | +168% | −0.8% | −0.5% | −8.4% | — | +22.1% |
How this is calculated. We score only open-market purchases (SEC code
P) — the buys that carry real signal. Each trade's return is measured from the adjusted closing price on the purchase date to the latest close, accounting for stock splits and dividends. The 1M/3M/6M/12M columns show the same trade's return after each fixed holding period; a dash means that horizon hasn't elapsed yet or isn't priceable. Sales are excluded because insiders sell for many routine reasons. With only 3 scored trades, treat this as a small sample, not a verdict.
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Open-market buys
$468.5K
3 trades
Open-market sells
$2.56M
3 trades
Net flow
−$2.09M
Net selling
Total filings
27
transactions shown
Full transaction history
All Form 4 activity across every company, newest firstMASI
+$0
1,225 sh
MASI
+$0
1,225 sh
MASI
+$0
335 sh
MASI
−$21.6K
121 sh @ $178
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MASI
+$0
2,101 sh
MASI
−$187.6K
1,069 sh @ $175
MASI
+$0
873 sh
MASI
−$82.6K
471 sh @ $175
MASI
+$0
15,000 sh
MASI
−$1.42M
8,093 sh @ $175
MASI
+$0
2,034 sh
MASI
−$196.8K
1,123 sh @ $175
MASI
+$1.48M
11,141 sh @ $133
MASI
−$0
4,568 sh
MASI
+$1.14M
30,000 sh @ $38
MASI
−$1.63M
11,924 sh @ $137
MASI
−$900.2K
6,560 sh @ $137
MASI
−$27.1K
196 sh @ $138
MASI
+$377.1K
2,474 sh @ $152
MASI
−$0
974 sh
MASI
+$2.13M
15,000 sh @ $142
MASI
−$0
8,078 sh
MASI
−$0
126,888 sh
MASI
Brennan Michelle, MASI's Director, spent $15.5K of their own money on 100 shares at $155, growing their stake 1%.
+$15.5K
100 sh @ $155
MASI
Brennan Michelle, MASI's Director, spent $15K of their own money on 100 shares at $150, growing their stake 1%.
+$15K
100 sh @ $150
MASI
Jellison William R, MASI's Director, spent $437.9K of their own money on 3,000 shares at $146, growing their stake 168%.
+$437.9K
3,000 sh @ $146
Frequently asked questions
How is Scannell Timothy J's win rate calculated?
We take every open-market purchase (SEC code P) we can match to a stock price, then compare the split- and dividend-adjusted price on the purchase date to the most recent close. The win rate is the share of those buys currently trading above the purchase price. Sales and share grants are not scored.
Why are some buys not included in the score?
A purchase is excluded if we can't price it — for example if the ticker is missing from the filing, the company has been delisted, or the security isn't a common stock we can match to market data. Excluded counts are shown next to the scored total.
What do the 1M / 3M / 6M / 12M columns mean?
They show each purchase's return after a fixed holding period — one, three, six, and twelve months from the buy date — using split- and dividend-adjusted prices. This separates good entry timing from simply holding a long-running winner. A dash means that horizon hasn't elapsed yet for that trade, or the stock couldn't be priced at that date.
Does a high win rate mean I should copy this insider?
No. Past performance does not predict future results, sample sizes are often small, and an insider's edge in their own company doesn't transfer to yours. This is context, not a recommendation. InsiderSource is not investment advice.
Where does this data come from?
Trades come from Scannell Timothy J's SEC Form 4 filings on EDGAR. Prices come from public market data and are split/dividend-adjusted. Always verify against the original filings before acting.