Sumner Burstein
CIK 1648309 · View on SEC EDGAR ↗
Insider
First SEC filing: July 16, 2015 · Latest: July 16, 2015
On this page
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 9 non-open-market transactions below
last 12 months, based on the transactions shown below
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
9 other filings hidden
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Aug. 19, 2015 | CRBP | S 10b5-1 | 200,000 | $3.04 | $608,000 | 3,594,846 Direct | -5.27% | Disposed | -88.7% (price as of 2026-08-19) |
| July 15, 2015 | CRBP | S | 30,000 | $2.82 | $84,600 | 3,794,846 Direct | -0.78% | Disposed | -87.9% (price as of 2026-08-19) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Initial ownership (Form 3) 1 holding
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| July 16, 2015 | CRBP | Common Stock | 3,825,546 | Direct |