BIIB
−$847.6K
2,555 sh @ $332
Vounatsos Michel
Director, Chief Executive Officer, EVP & Chief Commercial Officer · SEC CIK 1672709Advertisement
Buy track record
How this insider's open-market purchases have performed0%
of buys now in profit
0 up · 5 down
Avg return since buy−25.9%
Median return−27.3%
Best trade−14.1%
Worst trade−38.1%
Buys scored5
Average return by holding period — separates good entry timing from riding one long winner
After 1 month
−0.2%
40% won · 5 trades
After 3 months
−0.7%
60% won · 5 trades
After 6 months
+9.9%
80% won · 5 trades
After 12 months
+4.3%
40% won · 5 trades
| Date | Company | 90d trend | Buy price | Value | ΔOwn | 1M | 3M | 6M | 12M | To date |
|---|---|---|---|---|---|---|---|---|---|---|
| Nov 30, 2020 | BIIB | $241 | $748K | +9.8% | +1.4% | +12.4% | +11.2% | −1.8% | −17.9% | |
| May 1, 2019 | BIIB | $231 | $1.01M | +26% | −2.7% | +5.9% | +30.4% | +27.7% | −14.1% | |
| Dec 29, 2017 | BIIB | $321 | $250K | +19% | +12.5% | −14.0% | −8.9% | −5.5% | −38.1% | |
| May 1, 2017 | BIIB | $271 | $380.4K | +92% | −6.9% | +7.4% | +16.5% | +1.3% | −27.3% | |
| Feb 27, 2017 | BIIB | $285 | $380.4K | +999% | −5.5% | −15.3% | +0.4% | −0.4% | −32.3% |
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 5 scored trades, treat this as a small sample, not a verdict.
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Open-market buys
$2.77M
5 trades
Open-market sells
$0
0 trades
Net flow
+$2.77M
Net buying
Total filings
47
transactions shown
Full transaction history
All Form 4 activity across every company, newest firstBIIB
+$0
1,480 sh
BIIB
−$151.7K
658 sh @ $231
BIIB
Vounatsos Michel, BIIB's CEO, spent $1.01M of their own money on 4,351 shares at $231, growing their stake 26%.
+$1.01M
4,351 sh @ $231
BIIB
+$0
5,269 sh
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BIIB
−$778.9K
2,340 sh @ $333
BIIB
+$0
6,899 sh
BIIB
−$837.5K
2,622 sh @ $319
BIIB
+$0
1,687 sh
BIIB
−$205.6K
750 sh @ $274
BIIB
+$0
5,354 sh
BIIB
−$561.9K
1,877 sh @ $299
BIIB
Vounatsos Michel, BIIB's CEO, spent $250K of their own money on 780 shares at $321, growing their stake 19%.
+$250K
780 sh @ $321
BIIB
+$0
1,736 sh
BIIB
−$153K
564 sh @ $271
BIIB
Vounatsos Michel, BIIB's CEO, spent $380.4K of their own money on 1,402 shares at $271, growing their stake 92%.
+$380.4K
1,402 sh @ $271
BIIB
Vounatsos Michel, BIIB's CEO, spent $380.4K of their own money on 1,333 shares at $285, growing their stake 1321%.
+$380.4K
1,333 sh @ $285
Frequently asked questions
How is Vounatsos Michel'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 Vounatsos Michel'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.