This chart shows how the Salesforce acquisition of Slack for $27.7 billion stacks up against tech's largest deals ever

• On Tuesday afternoon, Salesforce announced plans to purchase Slack for $27.7 billion — one of the largest ever tech acquisitions.
• The purchase tops Microsoft's 2016 acquisition of LinkedIn by a bit more than $1 billion, putting it among the top five largest tech acquisitions of all time.
• Salesforce CEO Marc Benioff called the combination of Salesforce and Slack, "a match made in heaven" in the announcement. "Together, Salesforce and Slack will shape the future of enterprise software and transform the way everyone works in the all-digital, work-from-anywhere world."

Salesforce announced plans on Tuesday to purchase Slack, the company that makes the workplace messaging app of the same name. 

The acquisition is valued at $27.7 billion, instantly putting it among the top five largest tech acquisitions of all time — just edging out Microsoft's $26.2 billion acquisition of LinkedIn back in 2016. 

The chart below demonstrates how big Salesforce's acquisition of Slack is:

Here's a look at the history of tech's most expensive acquisitions, from Apple's measly $3 billion purchase of Beats all the way to Dell's notoriously expensive $67 billion acquisition of EMC Corporation:

28. Apple bought Beats in 2014 for $3 billion.

Apple's purchase of Beats in 2014 was a two-part play: For the Beats headphone lineup, and for foundational software that would eventually lead to Apple Music. It also led to a notorious (and hilarious) video of Dr. Dre celebrating the sale with his friend Tyrese that reportedly caused Apple to "freak out."

27. Google bought Nest in 2014 for $3.2 billion.

Google's purchase of Nest in 2014 was a strategic pickup in Google's ongoing battle with Amazon in the smart home market. Nest's widely used thermostat was an early hit in the smart home business, and the Google division has only expanded out its offerings since being acquired.

26. Walmart bought Jet.com in 2016 for $3.3 billion.

Through the acquisition of Jet.com in 2016, Walmart bolstered its online storefront and has become a major player in the ecommerce market. Though Jet.com itself has since shuttered, the talent and technology that came with it live on through Walmart's online presence.

25. Cisco bought AppDynamics in 2017 for $3.7 billion.

Just as AppDynamics was set to go public, the company was purchased at the eleventh hour by Cisco for $3.7 billion — an effort from Cisco to push further away from its hardware roots into the software and services business.

24. Adobe bought Marketo in 2018 for $4.75 billion.

Adobe's purchase of Marketo added the company's services to its "Adobe Experience Cloud," a business software suite sold by Adobe. Marketo's software added several marketing services to the AEC.

23. Microsoft bought aQuantive in 2007 for $6.3 billion.

In 2007, former Microsoft CEO Steve Ballmer led an acquisition of a company named aQuantive worth over $6 billion. Though the purchase was intended to get Microsoft more deeply involved in the online advertising business, it ultimately led to a massive $6.2 billion writedown.

22. Salesforce bought MuleSoft in 2018 for $6.5 billion.

Relatively unknown prior to being purchased by Salesforce, MuleSoft has become a major part of the cloud giant's portfolio. The standout service provided by MuleSoft is named Anypoint, and it enables Salesforce developers to make disparate app work together. It was the first of two major acquisitions Salesforce made in the last few years.

21. Microsoft bought Nokia in 2014 for $7.2 billion.

Among the many acquisitions made under the leadership of former Microsoft CEO Steve Ballmer, the purchase of Nokia for $7.2 billion was among the least successful. Less than two years after the purchase, Microsoft's new CEO Satya Nadella took a $7.6 billion writedown in financials and laid off nearly 8,000 Nokia employees.

20. Oracle bought Sun Microsystems in 2009 for $7.4 billion.

Oracle's purchase of Sun Microsystems was very specific: To own the rights to the Java programming language. Those rights would eventually lead to an ongoing legal battle with Google. For Sun Microsystems, which was in decline and saddled with loads of debt at the time, an acquisition was a lifeline.

19. Microsoft bought GitHub in 2019 for $7.5 billion.

For Microsoft, a company founded by computer programmers, the acquisition of GitHub makes a lot of sense: It offers a direct path for the massive network of computer-minded GitHub users into Microsoft's large ecosystem. It also offers a potential pipeline for some of the world's most computer savvy folks to work at Microsoft.

18. Microsoft bought Skype in 2011 for $8.5 billion.

For years, before Google Hangouts and Zoom chats offered other options, Microsoft-owned Skype was the de fact video chat software. Things have changed over time, of course, but Microsoft's 2011 purchase of Skype was a strategic move into consumer communications software that has continued to pay off: The video chat software is always a marquee example of how a new Microsoft device might work

17. Oracle bought PeopleSoft in 2004 for $10.3 billion.

Oracle's acquisition of PeopleSoft is a notoriously contentious story. "It was an 18-month hostile takeover," senior executive Aneel Bhusri told Business Insider back in 2011.

PeopleSoft offered software-based human resources solutions for companies and schools, and its products are still offered by its current parent company, Oracle.

16. NXP bought Freescale in 2015 for $11.8 billion.

When NXP, one of the lesser-known computer chip manufacturers, purchased Freescale in 2015, the deal cemented NXP as a dominant force in the silicon market.

15. Google bought Motorola Mobility in 2011 for $12.5 billion.

Though Google continues to produce and sell smartphones under its Pixel line, the company used to make smartphones in collaboration with Motorola (and other handset makers). That relationship eventually turned into an outright acquisition, though another critical aspect of the purchase wasn't said out loud: Patents.

14. Symantec bought Veritas Software in 2004 for $13.5 billion.

Symantec's purchase of Veritas Technologies, like so many tech acquisitions, was a measure of expansion and solidification. Veritas offered information management solutions. Symantec and Veritas split in 2014, and it is a private company once again.

13. Amazon bought Whole Foods in 2017 for $13.7 billion.

Amazon's purchase of Whole Foods was the first major push into bricks-and-mortar retail from the ecommerce giant and was largely intended as an expansion of Amazon's annual subscription service Amazon Prime. Prime users get discounts in the store, and Amazon products like the Echo are advertised alongside apples and bananas.

12. Intel bought MobileEye in 2017 for $15 billion.

As technology companies jockey for position in the race to create self-driving software, companies like Intel are paying billions for startups like MobileEye with proven tech. In the case of Intel's MobileEye, the goal is a "robo-taxi" rather than implementing the tech in consumer cars.

11. Salesforce bought Tableau in 2019 for $15.7 billion.

In another major Salesforce acquisition, the tech giant purchased Tableau last year for nearly $16 billion. It's the latest purchase in Salesforce's ongoing plan to strategically acquire companies that can help Salesforce grow. In the case of Tableau, Salesforce got a data analytics and visualization platform with over 86,000 customers.

10. Walmart bought Flipkart in 2018 for $16 billion.

Walmart's big bet on Flipkart is all about international expansion: Flipkart serves the Indian market, and with the acquisition, Walmart now has a major foothold in the region. It's also a critical step in Walmart's ongoing push into ecommerce, as Flipkart is an online-based retailer.

9. Nokia bought Alcatel-Lucent in 2015 for $16.6 billion.

Nokia's purchase of Alcatel-Lucent was positioned as a means of expanding its network technology business in the wake of its mobile phone business being sold to Microsoft. The purchase has enabled Nokia to become one of several major players in the move to 5G wireless networks.

8. Facebook bought WhatsApp in 2014 for $22 billion.

Facebook's purchase of WhatsApp in 2014, though wildly expensive, enabled Facebook to instantly expand its reach by tens of millions of people. Despite its connection to Facebook, like Instagram, WhatsApp remains popular around the world. 

7. Hewlett-Packard bought Compaq in 2001 for $25 billion.

In a piece published in 2016 by ZDNet titled "Worst tech mergers and acquisitions," the $25 billion purchase of Compaq by Hewlett-Packard is ranked number one on that list. Why? Not only did it eventually lead to a massive downturn at the company, but its failure was forewarned by several major stakeholders — including the son of the company's cofounder, Walter Hewlett.

6. Microsoft bought LinkedIn in 2016 for $26.2 billion.

The acquisition of LinkedIn is part of the new era of Microsoft acquisitions, where companies are intentionally left to operate relatively autonomously. To that end, LinkedIn has remained relatively unchanged since its purchase back in 2016 for $26.2 billion. 

Of note: LinkedIn is Microsoft's most expensive acquisition of all time, and anything above that paid for TikTok would instantly make it the new most expensive purchase.

5. Salesforce intends to buy Slack for $27.7 billion.

With the acquisition of Slack, Salesforce is making its most expensive bet ever: That the latest workplace messaging app du jour is worth $27.7 billion. 

Slack has become the predominant workplace messaging software, and it's become more critical than ever with millions of people working from home amid the ongoing pandemic. The purchase of Slack is a direct shot at Salesforce's longtime rival, Microsoft, which has had its own success with the workplace messaging tool Microsoft Teams.

Salesforce CEO Marc Benioff described the combination of Salesforce and Slack as "a match made in heaven." According to Benioff, the two will, "shape the future of enterprise software and transform the way everyone works in the all-digital, work-from-anywhere world."

4. SoftBank bought ARM in 2016 for $31 billion.

SoftBank's purchase of ARM could become an investment — the latest news is that NVIDIA is reportedly looking at a purchase of ARM from SoftBank which would assuredly be north of the $31 billion SoftBank paid back in 2016.

3. IBM bought Red Hat in 2018 for $34 billion.

IBM's purchase of Red Hat took a variety of popular software and instantly collected it under IBM's umbrella: From Red Hat Enterprise Linux to Red Hat Virtualization. As part of the $32 billion deal, Red Hat products are now a part of IBM Cloud.

2. Avago bought Broadcom in 2015 for $37 billion.

Never heard of Avago? How about Broadcom? Though both companies are massive, they're also both relatively unknown. That's because they're responsible for the infrastructure and technology inside of many products made by other companies, from cable modems to the chips powering Ethernet switches.

1. Dell bought EMC Corporation in 2015 for $67 billion.

By far the most expensive acquisition of all time continues to be Dell's $67 billion purchase of EMC Corporation in 2015. 

"We're continuing to evolve the company into the most relevant areas where I.T. is moving," Dell president Michael Dell told the New York Times in a 2015 interview. "This deal just accelerates that." Combining Dell's offerings with EMC allowed Dell to push further into corporate computing services, and it allowed EMC to escape pressure from investors to stem ongoing business declines.