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* Concentrated shareholder base among biotech companies

* Top 10 investors average 60 pct control at leading targets

* Big Pharma hungry for biotech assets to refill pipelines

By Ben Hirschler and Sophie Sassard

LONDON, May 2 (Reuters) – Biotech companies are fighting

back in an unequal battle with Big Pharma, helped by a small but

powerful cohort of investors who dominate the companies’ share

registers.

A Reuters analysis of 10 likely biotech takeover targets

shows the extent to which a few large investors, including

Fidelity Investments, Capital Research Global Investors,

Wellington Management and T. Rowe Price Associates hold the keys

to the kingdom when it comes to negotiating a deal.

From Amylin Pharmaceuticals to Onyx Pharmaceuticals

and Human Genome Sciences, these U.S.-based

companies are, on average, 60-percent held by their top 10

shareholders, according to ownership filings.

That can help explain their ability to fend off an unwanted

advance by the biggest players in the drug industry.

“There is a lot of concentration of power in the hands of

certain shareholders, which basically demands more negotiations

and more convincing arguments before deals get done,” said

long-time biotech investor Francesco De Rubertis, a partner at

Index Ventures.

It could also leave major drugmakers with little option but

to contemplate higher deal premiums, as they hunt for promising

new drugs and technologies to refill pipelines depleted by the

biggest wave of patent expiries in pharmaceutical history.

In some cases the fight-back is already gaining traction.

Last month GlaxoSmithKline had a $2.6 billion offer

for its long-time partner Human Genome spurned with no

discussion, while a resounding snub from investors prompted

Roche to walk away from Illumina.

“The key learning point is that Big Pharma needs to avoid

bids being painted as opportunistic,” said Charles Hoare, global

head of healthcare M&A; at Commerzbank. “If it involves big

shareholders having to accept a big loss on their investment, it

is much harder to persuade them.”

DIGGING IN THEIR HEELS

Big share price swings linked to the highs and lows of

developing risky products means investors have bought in at

widely differing points on the biotech rollercoaster.

Certainly, investors who have kept the faith through bad

times now appear to be digging in their heels.

Take Mark Evans, a fund manager at Taube Hodson Stonex

(THS), the sixth-largest Human Genome investor with 5.6 percent.

He finds GSK’s $13 a share unacceptable and is galled that the

market failed to recognise the company’s value before the bid.

“Glaxo has been very clever to bid at the point of least

confidence,” he said. “It just shows how differently the stock

market values these businesses compared to industrial buyers.”

THS has been invested in Human Genome since 2004. Others

bought more recently, notably when the shares surged from some

$3 in July 2009 after the U.S. firm and GSK announced impressive

clinical trials results with lupus drug Benlysta.

“I imagine that a lot of holders bought in after the first

successful Benlysta trial. They would have bought between $15

and $18, so they need $20 really,” Evans said.

After two decades of partnership, GSK Chief Executive Andrew

Witty had hoped for a better reception when he wrote to his

opposite number Tom Watkins on April 11.

Instead, he got a brief telephone call at 10.00 a.m. London

time on April 19, just 12 minutes before Human Genome issued a

press release rejecting GSK’s offer, according to a person

familiar with the situation.

Watkins, however, was cheered on by his investors. What

sticks in their craw is the fact that while GSK offered an 81

percent premium, the price per share was still less than half

last year’s peak.

Significantly, another biotech deal on April 23 involved

AstraZeneca clinching agreement to buy Ardea Biosciences

for $1.26 billion – a smaller 54 percent premium but a

price 10 percent above the stock’s 52-week high.

Amylin, meanwhile, is negotiating a tricky path. After

reportedly rejecting a $3.5 billion unsolicited bid from

Bristol-Myers Squibb, it is now under pressure from

activist investor Carl Icahn to sell itself. Sources familiar

with the matter have said it is exploring a sale with the help

of Credit Suisse and Goldman Sachs.

PRESSURE TO BUY

During the downturn, Big Pharma’s fat dividends and share

buybacks kept many investors happy. Now, though, investors are

looking for growth – increasing the pressure to access promising

new drugs locked away in biotech labs.

“We and the competition are thinking the same thing: we need

to do deals to augment the internal portfolio,” AstraZeneca

research head Martin Mackay said in an interview. “This isn’t

just a gap-filler. This is going to be the strategy for years to

come.”

The world’s top drugmakers all have the financial muscle to

do bolt-on biotech deals running into billions of dollars, and

are likely to find themselves competing more closely for

attractive assets.

Pfizer CEO Ian Read said in an interview this week

he was on the hunt for mid-size deals of around $4 billion that

could add promising new treatments for diabetes, cancer and

neurological conditions. And sources have told Reuters that

Bayer is close to a multi-billion euro deal to

bolster its healthcare decision.

In the long run, seeing off opportunistic approaches may pay

off for some biotech firms, but it can be a gamble. Investors in

the biotech “hold-out” camp will be hoping others can emulate

Switzerland’s Actelion, which this week produced

knock-out clinical trial results with a new lung drug.

The success of macitentan means investors who backed

Actelion’s management last year, in the face of a push by

activists to consider selling up, can now breathe a lot easier.

(Additional reporting by Paritosh Bansal in New York; Editing

by Michele Gershberg and David Holmes)