MBX
+$0
2.09M sh
SANDELL SCOTT D
Director, 10% Owner · SEC CIK 1237289
Insider at
COUR Coursera, Inc.
KRRO Korro Bio, Inc.
SGP SpyGlass Pharma, Inc.
NEUE NeueHealth, Inc.
NET Cloudflare, Inc.
BZFD BuzzFeed, Inc.
SNTI Senti Biosciences, Inc.
MRKR Marker Therapeutics, Inc.
MBX MBX Biosciences, Inc.
ZFOX ZeroFox Holdings, Inc.
SGMT Sagimet Biosciences Inc.
BHG Bright Health Group Inc.
BGRY Berkshire Grey, Inc.
SVRA Savara Inc
MIRM Mirum Pharmaceuticals, Inc.
UTRS MINERVA SURGICAL INC
GLYC GLYCOMIMETICS INC
OYST Oyster Point Pharma, Inc.
Advertisement
Buy track record
How this insider's open-market purchases have performed38%
of buys now in profit
3 up · 5 down
Avg return since buy−12.3%
Median return−42.6%
Best trade+132.7%
Worst trade−100.0%
Buys scored8
Average return by holding period — separates good entry timing from riding one long winner
After 1 month
−9.5%
50% won · 8 trades
After 3 months
−27.8%
13% won · 8 trades
After 6 months
−29.4%
33% won · 6 trades
After 12 months
−51.8%
17% won · 6 trades
| Date | Company | 90d trend | Buy price | Value | ΔOwn | 1M | 3M | 6M | 12M | To date |
|---|---|---|---|---|---|---|---|---|---|---|
| Mar 10, 2026 | KRRO | $11 | $2.3M | +19% | +10.5% | −7.8% | — | — | +6.0% | |
| Feb 9, 2026 | SGP | $16 | $15M | +18% | +3.6% | −9.2% | — | — | −28.2% | |
| Dec 23, 2024 | MRKR | $3 | $1.77M | +52% | −32.2% | −62.6% | −58.5% | −60.5% | −61.7% | |
| Sep 16, 2024 | MBX | $16 | $8M | +16% | +11.7% | −11.6% | −59.1% | −55.0% | +132.7% | |
| Apr 22, 2024 | KRRO | $56 | $1,000K | +1.7% | −26.6% | −29.2% | +2.4% | −76.1% | −82.2% | |
| Jul 18, 2023 | SGMT | $16 | $480K | +0.8% | −20.6% | −65.5% | −59.6% | −79.9% | −57.1% | |
| Jul 17, 2023 | SVRA | $3 | $1,000K | +1.4% | +9.6% | +11.1% | +40.4% | +52.2% | +92.0% | |
| Feb 9, 2023 | UTRS | $0 | $5M | +244% | −32.1% | −47.3% | −41.8% | −91.5% | −100.0% |
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 8 scored trades, treat this as a small sample, not a verdict.
Advertisement
Open-market buys
$34.55M
8 trades
Open-market sells
$31.25M
35 trades
Net flow
+$3.3M
Net buying
Total filings
76
transactions shown
Full transaction history
All Form 4 activity across every company, newest firstMBX
Sandell Scott D, MBX's 10% owner, spent $8M of their own money on 500,000 shares at $16, growing their stake 16%.
+$8M
500,000 sh @ $16
NET
+$0
3,039 sh
COUR
+$0
18,669 sh
ZFOX
−$0
18.07M sh
Advertisement
KRRO
Sandell Scott D, KRRO's 10% owner, spent $1,000K of their own money on 17,857 shares at $56, growing their stake 2%.
+$1,000K
17,857 sh @ $56
SGMT
+$0
6,997 sh
NET
−$2.91M
39,913 sh @ $73
NET
−$1.3M
17,621 sh @ $74
NET
−$2.08M
28,442 sh @ $73
NET
−$923K
12,558 sh @ $74
NET
−$5.72M
78,389 sh @ $73
NET
−$2.54M
34,611 sh @ $74
NET
−$0
10,283 sh
COUR
−$0
24,695 sh
NET
−$85.4K
1,338 sh @ $64
NET
−$610.2K
9,455 sh @ $65
NET
−$192.3K
2,944 sh @ $65
NET
−$437.3K
6,570 sh @ $67
NET
−$610.2K
9,455 sh @ $65
NET
+$0
20,307 sh
BGRY
−$0
38.18M sh
SGMT
+$0
3.77M sh
SGMT
+$10.7K
13,404 sh @ $1
SGMT
−$10.6K
662 sh @ $16
SGMT
New Enterprise Associates 13 Lp, SGMT's 10% owner, spent $480K of their own money on 30,000 shares at $16, growing their stake 1%.
+$480K
30,000 sh @ $16
SVRA
Sandell Scott D, SVRA's 10% owner, spent $1,000K of their own money on 333,333 shares at $3, growing their stake 1%.
+$1,000K
333,333 sh @ $3
MIRM
+$0
11,348 sh
NET
+$0
2,871 sh
COUR
+$0
16,186 sh
Frequently asked questions
How is SANDELL SCOTT D'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 SANDELL SCOTT D'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.