Insights

SiriusXM Ownership Research: Berkshire Leads a 553-Holder M&A Watchlist

SIRIUSXM HOLDINGS INC has 553 institutional holders and 18 active top-20 holders behind its current market catalyst.

SiriusXM’s iHeart Talks Land in a Holder Base Led by Berkshire

SiriusXM and iHeartMedia merger talks give SIRI a strategic catalyst, but the ownership map is unusually concentrated: Berkshire is the largest disclosed holder and 13D/G activity is already present.

Rivian’s R2 Production Start Now Has an 852-Holder Ownership Test

Rivian started R2 production in Normal, Illinois; 13F Insight data shows 852 institutional holders and an active-holder base that will test whether the milestone can become durable sponsorship.

Rivian Ownership Research: R2 Production Meets 852 Institutional Holders

RIVIAN AUTOMOTIVE INC has 852 institutional holders and 18 active top-20 holders behind its current market catalyst.

Lockheed Martin Ownership Research: 2,915 Holders Behind the Defense Miss

LOCKHEED MARTIN CORP has 2,915 institutional holders and 16 active top-20 holders behind its current market catalyst.

How to Separate Market-Maker 13F Exposure From Conviction

Trading-firm 13Fs can show huge reported value without implying a long-only stock-picking thesis.

How to Read Founder Sales With Beneficial Ownership

Founder sales can look alarming until you compare Form 4 activity with 13D/G beneficial ownership.

How to Check Market News Against Active Holder Depth

A market headline becomes more useful when you test whether active holders are already present in the stock.

GE Vernova Ownership Research: Power-Demand Guidance Meets 2,996 Holders

GE VERNOVA INC has 2,996 institutional holders and 17 active top-20 holders behind its current market catalyst.

How to Use Remaining Ownership After Insider Sales

The share count after an insider sale often matters more than the sale headline itself.

How to Test Auto Show News Against 13F Ownership

Auto-show headlines reveal product strategy; holder data reveals whether institutions are positioned for the outcome.

How to Read Active Holder Depth in Small-Cap Semiconductors

Small semiconductor stocks can look thin until you separate passive scale from active specialist ownership.

How to Compare Airline Fuel News With Holder Depth

Fuel-cost headlines move airline stocks quickly, but holder depth shows whether institutions actually reposition after the shock.

How to Read 13D/G Exit Filings Without False Signals

13D/G exit filings can look dramatic, but investors need to compare them with holder tables, amendments and reporting thresholds before calling an ownership exit.

Mariner Kemper’s UMBF Sales Come After Heartland, Not in an Ownership Vacuum

Mariner Kemper sold UMBF shares in February 2026 after UMB’s Heartland acquisition year, while 13D/G data still showed a 4.81% beneficial ownership marker.

Balu Balakrishnan’s POWI Sales Need an Earnings and Ownership Cross-Check

Power Integrations director Balu Balakrishnan sold POWI shares after Q4 results, but the filed data points to a continuing position and a deep 320-holder institutional base.

Delta’s Jet-Fuel Risk Is Now a 1,386-Holder Ownership Test

A European jet-fuel shortage has turned airline cost pressure back into a market story. Delta’s 1,386-holder base shows where to look for confirmation beyond fare and cancellation headlines.

GM’s Beijing Auto Show Moment Lands in a 1,575-Holder Ownership Base

Global automakers used the Beijing auto show to showcase new models. GM’s ownership map shows why the event matters beyond headlines: 1,575 tracked institutional holders and recent 13D/G activity create a deep but mixed signal.

POWI Ownership Map: 320 Holders Put Power Integrations Beyond a Thin Small-Cap Signal

Power Integrations has 320 tracked institutional holders, with BlackRock, Vanguard, Neuberger Berman and active small-cap managers creating a deeper ownership map than its size suggests.

How to Read Multi-Class Insider Sales Without False Exit Claims

How to Read Multi-Class Insider Sales Without False Exit Claims with a practical checklist for separating ownership structure from headline narrative.