Sumner Burstein

CIK 1648309 · last filed 2015-11-17

Sumner Burstein is a corporate insider who has filed 3 SEC Form 4 insider transactions across 1 company since 2015. The most recent filing, for CRBP, was dated Nov 17, 2015. Across all open-market trades the lifetime net is −$692.4K, making them a net seller over the disclosed history. Current disclosed insider exposure totals $31.4M across reported positions.

"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.

Disclosed Exposure

$31.42M

Companies

1

Total Filings

3

Lifetime Open-Market Net

-$692.4K

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.

Symbol	Role	Shares	Price	Disclosed Exposure	Lifetime OM Net	Filings	Latest Filed
CRBP	10%+ Owner	3,594,571	$8.74	$31.42M	-$692.4K	3	2015-11-17

Recent Filings

3 filings

Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.

Filed	Symbol	Action	Net Shares	Net $	Link
2015-11-17	CRBP	Gift (G)	−375	$0	EDGAR
2015-08-21	CRBP	Sell (S)	−200,000	-$607.8K	EDGAR
2015-07-17	CRBP	Mixed	−30,600	-$84.6K	EDGAR

Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.