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 BioPharma stock is...
Looking at the aggregate data, we see that MannKind (Nasdaq: MNKD) is above the rest in terms of watch interest, the percentage of people keeping an eye on BioPharma stocks in general who are specifically watching each company. And for good reason. As CAPS player GreenCollegeGrad wrote in March:

MannKind corporation, a S P four star rated stock, is awaiting the FDA to approve its star in the making, an inhaled insulin named Afrezza. Though biotech can be risky this play is certainly worth taking a gamble on, especially when S P rates a fair value at 5.50 and a "consider selling" price at 11. Gonna hve to reccomend this one

Here are the rest of the top 15 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

Watch Interest

1

MannKind

$504

**

9.7%

2

Celgene (Nasdaq: CELG)

$28,689

****

8.1%

3

Amarin (Nasdaq: AMRN)

$1,888

***

7.4%

4

Vertex Pharmaceuticals (Nasdaq: VRTX)

$10,438

***

7.4%

5

BioSante Pharmaceuticals (Nasdaq: BPAX)

$338

***

7.2%

6

Keryx Biopharmaceuticals (Nasdaq: KERX)

$341

***

5.8%

7

Immunogen

$1,063

****

5.3%

8

Amylin Pharmaceuticals

$2,074

***

4.6%

9

Regeneron Pharmaceuticals

$5,421

**

3.1%

10

Cubist Pharmaceuticals

$2,194

****

3.0%

11

Isis Pharmaceuticals

$927

****

2.8%

12

Sunesis Pharmaceuticals (Nasdaq: SNSS)

$98

****

2.5%

13

Cephalon

$6,201

****

2.2%

14

Opko Health

$1,158

**

2.2%

15

SciClone Pharmaceuticals

$359

***

1.6%

Source: Motley Fool, Motley Fool CAPS.

Whether you're keeping an eye on the industry stalwarts like Celgene or are watching an up-and-comer like MannKind, 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.

Motley Fool newsletter services have recommended buying shares of Vertex Pharmaceuticals and ImmunoGen. 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.