What changed in the filings
Material institutional moves, insider purchase clusters, and filing amendments, checked against primary SEC records and linked to the live data underneath.
A weekly research desk built from amendment-aware 13F and Form 4 data. No price calls, anonymous tips, or rewritten market commentary.
Latest readout
13F Filing Deadlines in 2026: The Full Calendar
Every SEC 13F deadline for 2026, when filings actually land, and how to be ready the moment hedge fund holdings go public. Includes Form 4 and 13D timing.
Read the source-backed analysisArchive
Dated analysis
Where Insiders Are Cluster-Buying: June 2026 Form 4 Data
Companies where three or more insiders bought stock on the open market in the last 60 days, from SEC Form 4 filings: Ryan Specialty, Charter, S&P Global, and a run of small banks.
The Biggest Hedge Fund Moves of Q1 2026, Decoded
In Q1 2026, 652 funds "bought" Versant and 404 "sold" CyberArk. Most of it was not trading. Here is what 13F position changes actually measure, with the real numbers.
What Berkshire Hathaway Bought and Sold in Q1 2026
Berkshire tripled its Alphabet stake, opened a new Delta Air Lines position, and cut Chevron by 35%. A line-by-line readout of the Q1 2026 13F filing.
The Most-Owned Stocks Among Hedge Funds in Q1 2026
We aggregated 1.87 million holdings from 1,824 institutional 13F filings for Q1 2026. Here are the stocks the most funds actually own, ranked by breadth of ownership.
Material
A filing must change the ownership picture, not merely exist.
Traceable
Every claim must resolve to Arkolith data and a primary filing.
Usable
Each edition ends in a live entity page and an API or MCP workflow.
Run the underlying screen yourself
Pull the source-linked Form 4 signal feed, inspect a live issuer, or connect the MCP server so an agent can repeat the analysis.
curl -H "Authorization: Bearer $ARKOLITH_KEY" "https://arkolith.com/api/v1/insider/transactions?signal=true"