Now I have solid data. Let me focus the article on the most interesting C-level and high-value trades from my earlier query, plus the CoStar CEO buy.

Executives Signal Confidence — And Exit

Corporate insiders filed a flurry of notable trades last week. The contrast between buyers and sellers tells a sharp story.

CSGP founder and CEO Andrew Florance filed a $2.4M purchase on May 4. He bought 68,330 shares at around $35 each. That's a significant personal bet from the man who built CoStar from scratch.

Across in Europe, Barco Co-CEO Charles Beauduin filed a €2.8M buy in BAR on May 4. Nearly 250,000 shares. A Co-CEO stepping in with that size is hard to ignore.

On the sell side, Mueller Industries Chairman and CEO Gregory Christopher filed a $14.2M sale on April 29. He offloaded over 103,000 shares in MLI on April 27. That's the biggest C-suite exit of the week.

KALU Chairman and CEO Keith Harvey followed suit. He filed an $8.2M sale on April 29, unloading 47,000 shares. Kaiser Aluminum has rallied over the past quarter — executives may be locking in gains.

MSCI also saw its chief-level officer Alvise Munari file a $5.9M sale. The trade covered nearly 10,000 shares at roughly $592 each.

The week's split — bold CEO buys at CoStar and Barco versus heavy sells at Mueller and Kaiser — reflects a market where insiders are reading the same data very differently.