agentutility

13F-HR position deltas / institutional holdings change tracker / hedge-fund quarterly trade detector / Berkshire + Bridgewater + Citadel + Renaissance position-change feed / 13F diff / SEC institutional manager portfolio change / 'what did Buffett buy this quarter' / EDGAR 13F-HR delta. Diffs the two most recent 13F-HR filings for an institutional manager (by CIK) and returns added (new positions), exited (sold completely), increased (size up), and reduced (size down) buckets with per-position s