Growth Companies Determined to Stay Private

I just read a NYT article about Epic Systems, a medical software company run and largely owned by a lady who spends most of her day on products and customers needs and echews spending top management time on finance and who is systemically committed to NOT using budgets.  I'm now curious about how many companies follow this path.

I'm not talking about publicly traded companies with a large family influence like Walmart and Ford and News Corp.

I mean companies that have been kept private because they believe the long term is better if they remain privately owned. Not private equity, not 70/30 public/private. Private.

Here's ones I know about....

Epic Systems - Medical Software
Mars
ESRI
Highlights