ALXN
−$2.5K
18 sh @ $140
MACKAY MARTIN
Director, Executive Chairman, Chief Executive Officer, EVP & Global Head of R&D · SEC CIK 1414815Advertisement
Buy track record
How this insider's open-market purchases have performed0%
of buys now in profit
0 up · 2 down
Avg return since buy−81.4%
Median return−81.4%
Best trade−81.3%
Worst trade−81.6%
Buys scored2
Average return by holding period — separates good entry timing from riding one long winner
After 1 month
+28.9%
100% won · 2 trades
After 3 months
−23.5%
0% won · 2 trades
After 6 months
−24.7%
0% won · 2 trades
After 12 months
−46.5%
0% won · 2 trades
| Date | Company | 90d trend | Buy price | Value | ΔOwn | 1M | 3M | 6M | 12M | To date |
|---|---|---|---|---|---|---|---|---|---|---|
| Jan 11, 2022 | RLYB | $11 | $47.9K | +1.6% | +29.1% | −24.0% | −25.2% | −47.8% | −81.6% | |
| Jan 10, 2022 | RLYB | $10 | $55.6K | +2.0% | +28.8% | −22.9% | −24.2% | −45.2% | −81.3% |
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 2 scored trades, treat this as a small sample, not a verdict.
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Open-market buys
$118K
3 trades
Open-market sells
$18.35M
28 trades
Net flow
−$18.24M
Net selling
Total filings
61
transactions shown
Full transaction history
All Form 4 activity across every company, newest firstALXN
−$138.9K
1,000 sh @ $139
ALXN
+$0
7,000 sh
ALXN
−$8.1K
58 sh @ $140
ALXN
−$263.3K
1,908 sh @ $138
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ALXN
+$14.6K
100 sh @ $146
ALXN
−$52.3K
362 sh @ $144
ALXN
−$14.4K
100 sh @ $144
ALXN
−$14.2K
100 sh @ $142
ALXN
−$56.5K
400 sh @ $141
ALXN
−$146.5K
1,043 sh @ $140
ALXN
+$0
11,763 sh
ALXN
+$2.95M
28,125 sh @ $105
ALXN
+$2.72M
15,375 sh @ $177
ALXN
−$3.37M
17,100 sh @ $197
ALXN
−$3.44M
17,518 sh @ $196
ALXN
−$1.73M
8,882 sh @ $195
ALXN
−$650.3K
4,056 sh @ $160
ALXN
−$66.7K
370 sh @ $180
ALXN
+$0
5,100 sh
ALXN
−$340.6K
1,990 sh @ $171
ALXN
−$337.4K
1,907 sh @ $177
ALXN
+$0
11,690 sh
ALXN
+$983.1K
9,375 sh @ $105
ALXN
−$1.8M
9,375 sh @ $192
ALXN
+$2.62M
25,000 sh @ $105
ALXN
−$839K
5,058 sh @ $166
ALXN
−$2.65M
15,949 sh @ $166
ALXN
−$668.4K
3,993 sh @ $167
ALXN
−$574.9K
3,574 sh @ $161
Frequently asked questions
How is MACKAY MARTIN'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 MACKAY MARTIN'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.