People watch stocks for different reasons -- they're waiting for a dip in price, watching for a specific catalyst, gathering all the news and information that might affect stocks they already own, or considering a sell. Regardless of their motivation, we can better understand market sentiment by seeing who's watching what. With the Fool's free My Watchlist service, we have tens of thousands of people telling us the businesses that have, for whatever reason, piqued their interest.

The most-watched machinery stock is ...
Looking at the aggregate data, we see that Westport Innovations (Nasdaq: WPRT) is above the rest in terms of watch interest, the percentage of people keeping an eye on machinery stocks in general who are specifically watching each company. And for good reason. As CAPS member sk8terman wrote two weeks ago,

Governmental help is no longer necessary for this Nat. gas stock to be wildly profitable. The market is making it happen. Nat. gas supplies will keep prices low for the foreseeable future and trucking companies that do not convert will not be able to compete. Within the next 2 quarters there will be a flood of orders from companies that remember what $4 gasoline did to their bottom line.

Here are the rest of the top fifteen most-watched companies in the industry with their watch interest along with the stocks' CAPS rating to show the sentiment of our investing community.

 

Company

Market Cap (millions)

CAPS Rating (out of 5)

Watch Interest

1

Westport Innovations

$860

*****

18.3%

2

Tennant (NYSE: TNC)

$772

*****

13.5%

3

Barnes

$1,146

****

11.3%

4

Caterpillar

$70,615

***

8.2%

5

PACCAR

$18,385

***

4.9%

6

Dynamic Materials (Nasdaq: BOOM)

$335

*****

4.1%

7

Tata Motors Ltd. (NYSE: TTM)

$17,120

*****

4.1%

8

Deere

$39,557

****

3.6%

9

Cummins (NYSE: CMI)

$21,184

****

2.4%

10

Middleby

$1,680

****

1.4%

11

Sterlite Industries

$51,590

*****

1.2%

12

Manitowoc (NYSE: MTW)

$2,831

*****

1.0%

13

Illinois Tool Works

$27,132

*****

1.0%

14

Joy Global

$9,901

****

0.9%

15

Mueller Water Products (Nasdaq: MWA)

$685

*****

0.9%

Sources: Motley Fool, Motley Fool CAPS.

Whether you're keeping an eye on the industry stalwarts like Caterpillar or are watching an up-and-comer like Westport Innovations, it pays to watch. We can help you keep tabs on your companies with My Watchlist, our free, personalized stock tracking service. Click here to start now.

Dan Dzombak's musings and articles he finds interesting can be found on his Twitter account: @DanDzombak.

PACCAR, Tennant, and Westport Innovations are Motley Fool Stock Advisor picks. Sterlite Industries is a Motley Fool Global Gains recommendation. Dynamic Materials and Mueller Water Products are Motley Fool Hidden Gems recommendations. Illinois Tool Works is a Motley Fool Income Investor pick. The Fool owns shares of Dynamic Materials. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.