The disclosure of long stocks comes with a delay, which makes it difficult to trade follow. Also, almost all insiders, when they place whale trades, place them through a proxy and we find usually months later.

The best ones track are the members (usually leaders) of most important committees:

• Intelligence: https://www.senate.gov/general/committee_membership/committee_memberships_SLIN.htm
• finance: https://www.senate.gov/general/committee_membership/committee_memberships_SSFI.htm
• Homeland security: https://www.senate.gov/general/committee_membership/committee_memberships_SSGA.htm
• Economic : https://www.senate.gov/general/committee_membership/committee_memberships_JSEC.htm

Then just find out when they do massive sales (dump their stock) or buys of specific industry group and/or single stock:

https://www.quiverquant.com/sources/senatetrading

https://senatestockwatcher.com/

But again, the trouble is delay in reporting and proxy trading that masks buying/selling.