Insider Profile · SEC Form 4 Activity · Trailing 90 Days

Song Haiyan

Over the trailing 90 days, Song Haiyan (Director at Eos Energy Enterprises, Inc.) sold $1.8M of stock across 2 companies, per 2 SEC Form 4 transactions.

Role: Director
Companies: EOSE CSGS
Window: Trailing 90 days · 2 transactions · CIK 1804708
Net activity: −$1.8M ($0 bought · $1.8M sold)
Source: Official filings on sec.gov ↗

By Company (Trailing 90 Days)

Symbol	Company	Txns	Bought	Sold	Net
CSGS	CSG SYSTEMS INTERNATIONAL INC	1	—	$1.8M	−$1.8M
EOSE	Eos Energy Enterprises, Inc.	1	—	—	$0

Transactions (2)

Date	Symbol	Type	Shares	Value	Description
2026-07-13	EOSE	Buy	30.0K	$0	Grant, award or other acquisition
2026-05-14	CSGS	Sell	22.6K	$1.8M	Disposition to the issuer of issuer equity securities

Activity shown covers the trailing 90 days of SEC Form 4 filings. "Buy" and "sell" follow the SEC acquired/disposed codes and include compensation events (grants, option exercises, tax withholding) unless noted. Historical fact, not investment advice.

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