UPDATE 3-Buyout firm Thoma Bravo adds Sophos to its cybersecurity chest with $3.8 bln deal

* Deal values Sophos at $7.40/share

* Stock price skyrockets past buyout price

* Sophos is Thoma Bravo's latest cybersecurity deal (Adds Sophos CEO comments, analysts comments)

By Yadarisa Shabong

Oct 14 (Reuters) - U.S. private equity firm Thoma Bravo is adding Sophos Group to its cybersecurity stable, announcing on Monday a buyout deal that values the British maker of antivirus and encryption products at about $3.8 billion.

The takeover price of 583 pence per share represented a 37% premium from Sophos's closing price on Friday and Sophos shares surged nearly 38% on news of the deal.

Sophos, whose customers include Under Armour Inc, Ford Motor Co and Toshiba Corp, listed in 2015 at 225 pence per share and has seen its market value double since then, despite a tough 2018.

Thoma Bravo's move for Sophos trails several other buyout deals by U.S. funds drawn towards the UK as the pound weakened ahead of Brexit.

Sophos Group shareholders will get $7.40 per share in cash, which is 583 pence per share.

Shares of rival Avast also rose after the Sophos deal was announced.

Sophos CEO Kris Hagerman told Reuters that his company had first been approached by Thoma Bravo in June.

"The (Sophos) board ultimately concluded that this offer and the acquisition can accelerate Sophos' progress in next-generation cybersecurity," Hagerman said.

CYBERSECURITY MARKET EVOLVING

Private equity funds are increasingly targeting listed companies in Britain. Advent recently offered to buy engineering firm Cobham while an investment consortium led by Blackstone looks to take control of Madame Tussaud's owner Merlin.

Thoma Bravo, which raised billions for its latest private equity fund this year, had been targeting the cyber security sector. Late last year, it bought Imperva and another cyber security firm called Veracode from Broadcom Inc.

In 2017, it purchased Sophos' close competitor Barracuda Networks, which manages data security over the cloud.

"The global cybersecurity market is evolving rapidly, driven by significant technological innovation, as cyber threats to business increase in scope and complexity," Seth Boro, managing partner, at Thoma Bravo said in a statement on Monday.

Analyst Neil Campling of Mirabaud Securities said Sophos could be "valuably merged with Barracuda to focus on the SMB (small and medium businesses) opportunities".

Sophos's Hagerman said there was a transition to next-generation security products such as machine-learning and APIs, with the cloud at the heart of that transition for products to actively communicate with each other and manage threat responses.

Hagerman noted that Sophos' growth in recent years has fundamentally been due to its security solutions that can be deployed to any size organisation.

Analysts at Hargreaves Lansdown cautioned investors about Thoma Bravo's dollar-denominated deal for Sophos, saying "but should a Brexit deal be agreed, a rally in sterling could leave investors out of pocket."

J.P. Morgan Cazenove, Lazard, and UBS AG London Branch were Sophos' financial advisers and Goldman Sachs advised Thoma Bravo. (Reporting by Yadarisa Shabong in Bengaluru; additional reporting by Pamela Barbaglia and Thyagaraju Adinarayan in London; Editing by Bernard Orr and Susan Fenton)