WSJ News Exclusive | Zendesk Receives Takeover Approaches

Thoma Bravo LP has also expressed interest, some of the people said. It isn’t clear which, if any, other suitors might be circling Zendesk.

The interest in Zendesk, the latest sign of the resurgence in big leveraged buyouts, surfaced as people familiar with the matter said that Jana Partners LLC is preparing to nominate four directors to the company’s board.

Shares in Zendesk closed up 11% after The Wall Street Journal reported that the company had received private-equity approaches and that Jana is preparing a proxy fight.

Zendesk in late October agreed to buy Momentive in an all-stock deal that at the time was worth about $4.1 billion. But investors and analysts are skeptical of its rationale, and based on Zendesk’s closing price Wednesday, the deal was worth $23.20 a share, compared with $28 when it was announced. (The deal value shot up to $25.69 a share by Thursday’s close as a result of the surge in Zendesk shares.)

Zendesk specializes in helping companies with customer communications, while

SurveyMonkey

facilitates the design and implementation of web-based surveys. The firms have said that by combining, they could help companies get better feedback from customers. Zendesk has said it expects the deal to add growth by 2023 and bring its revenue above $3.5 billion in 2024, a year ahead of target.

Jana Partners has argued that buying Momentive would slow Zendesk’s growth and dilute its margins. It also said it would diminish buyer interest in Zendesk.

Jana, which has said it owns around a 3% stake, is joined in its opposition to the deal by investment manager Janus Henderson Investors US LLC, which isn’t normally an activist and owns a roughly 5% stake, according to FactSet.

Zendesk’s deal for Momentive requires approval from both companies’ investors in votes that are scheduled for Feb. 25. Zendesk said the consortium offer wasn’t contingent on the termination of the Momentive deal.

Jana would need to nominate its board candidates before Zendesk’s deadline of Feb. 17.

Hellman & Friedman says on its website it has raised over $70 billion in assets under management and committed capital. It has been hunting for big deals lately, agreeing in November to team up with another firm to buy health-care technology company Athenahealth Inc. for $17 billion including debt.

London-based Permira invests in consumer, healthcare, technology and services companies and has roughly €58 billion, equivalent to $66 billion, under management.

With $81 billion in assets under management, Advent has been investing in technology for more than three decades.

Permira and Advent in November teamed up to buy security-software maker

McAfee Corp.

for around $12 billion.

Thoma Bravo focuses on technology and software deals and has around $91 billion under management, according to its website.

Zendesk also reported results late Thursday. It said it had fourth-quarter revenue of $375.4 million, an increase of 32% from a year earlier, and a loss of $61.9 million. It said it expected first-quarter revenue of $381 million to $387 million.

Momentive also reported Thursday, with its fourth-quarter revenue increasing 16% from a year earlier to $117.3 million.

Write to Cara Lombardo at cara.lombardo@wsj.com and Miriam Gottfried at Miriam.Gottfried@wsj.com