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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsOracle’s largest acquisition is Cerner: Oracle agreed to buy the healthcare-software company for approximately $28.3 billion in equity value, and the deal closed in June 2022. That moved Cerner well ahead of PeopleSoft, which had held the top spot in many older rankings. The list below ranks Oracle’s 10 largest publicly disclosed acquisitions by their nominal announced headline values, while identifying when a figure is equity value, gross transaction value or net of cash and debt.
How this ranking measures “biggest”
Deal announcements do not all use the same measure. Equity value represents the value attributed to shareholders; gross transaction value may include a broader deal headline, while net-of-cash figures subtract acquired cash and, in some cases, debt. Accounting purchase-price allocations can differ again because they reflect such items as assumed liabilities, acquired intangibles and goodwill.
This ranking uses each deal’s publicly announced headline value, in nominal dollars—not inflation-adjusted dollars or a later accounting purchase price. Where Oracle also disclosed a net-of-cash figure, it appears alongside the headline value. The list is therefore a practical historical comparison, not a perfectly uniform enterprise-value calculation. Announcement and closing dates are both included where they clarify the timeline.
| Rank | Acquisition | Announced / closed | Announced headline value | What it added |
|---|---|---|---|---|
| 1 | Cerner | 2021 / 2022 | About $28.3 billion equity value | Healthcare information systems and electronic health records |
| 2 | PeopleSoft | 2004 / 2005 | About $10.3 billion | ERP, HR, finance and supply-chain applications |
| 3 | NetSuite | 2016 / 2016 | About $9.3 billion | Cloud ERP and business applications |
| 4 | BEA Systems | 2008 | About $8.5 billion | WebLogic middleware and application infrastructure |
| 5 | Sun Microsystems | 2009 / 2010 | About $7.4 billion gross; $5.6 billion net of cash and debt | Java, Solaris, MySQL, servers and storage |
| 6 | Siebel Systems | 2005 / 2006 | $5.85 billion fully diluted equity value | Customer relationship management |
| 7 | MICROS Systems | 2014 | About $5.3 billion gross; $4.6 billion net of cash | Hospitality and retail software and hardware |
| 8 | Hyperion Solutions | 2007 | About $3.3 billion | Planning, budgeting, consolidation and analytics |
| 9 | Taleo | 2012 | About $1.9 billion net of cash and debt | Talent management and recruiting software |
| 10 | Acme Packet | 2013 | About $1.7 billion net of cash | Communications-network technology |
Oracle’s 10 largest acquisitions
1. Cerner: about $28.3 billion
Oracle announced its agreement to buy Cerner on December 20, 2021, for $95 per share, or approximately $28.3 billion in equity value. The transaction closed on June 8, 2022. Cerner supplied digital information systems used by hospitals and health systems, including electronic health-record software. Oracle now presents its healthcare offerings under the Oracle Health identity. Oracle’s deal announcement and its Cerner acquisition page give the price and closing details.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchCerner was a strategic departure as well as a size milestone. Oracle’s stated rationale centered on applying its cloud, database, security and voice-interface capabilities to healthcare data and workflows. Hospital technology also brings challenges unlike those of a typical enterprise-software integration: clinical safety, interoperability, regulatory requirements, government customers and complex implementations all matter. The deal’s significance lies in Oracle’s move into healthcare operations, not simply in adding another business-application product.
2. PeopleSoft: about $10.3 billion
Oracle announced its PeopleSoft agreement on December 13, 2004, at $26.50 per share and approximately $10.3 billion; it completed the acquisition in January 2005. PeopleSoft brought a broad enterprise-applications portfolio, including human resources, finance, supply-chain and ERP systems. Oracle’s announcement states the offer terms.
The acquisition helped turn Oracle from a company known primarily for databases and infrastructure software into a broader enterprise-applications vendor. It also put Oracle in more direct competition with SAP for large organizations’ ERP and business-application spending. PeopleSoft was a long-running platform decision: Oracle had to support and position the acquired applications alongside its own products, rather than treating the purchase as a one-time transfer of customers.
3. NetSuite: about $9.3 billion
Announced on July 28, 2016, at $109 per share in cash, Oracle’s NetSuite deal was valued at approximately $9.3 billion. Oracle completed it on November 7, 2016. NetSuite added cloud ERP and related business applications, with a particular foothold among small and midsize companies. Oracle’s announcement said the products were complementary and that both businesses would continue to coexist.
That coexistence mattered: NetSuite gave Oracle a distinct cloud-applications platform and expanded its reach beyond the largest enterprises. Oracle’s Q1 FY2026 earnings release continued to report NetSuite as a cloud ERP business, evidence that the acquisition remains visible in Oracle’s commercial portfolio rather than disappearing into a single product line.
4. BEA Systems: about $8.5 billion
Oracle’s acquisition of BEA Systems was completed on April 29, 2008, when BEA became a wholly owned Oracle subsidiary, according to Oracle’s SEC filing. The approximately $8.5 billion deal value is reported in contemporary acquisition coverage.
BEA’s WebLogic middleware and related infrastructure strengthened the layer between enterprise applications, databases and the systems beneath them. That helped Oracle present a more integrated software stack instead of selling its database as a largely standalone foundation. BEA belongs to the same portfolio-building period as PeopleSoft, Siebel and Hyperion: Oracle was assembling capabilities across the enterprise-software layers its customers used together.
5. Sun Microsystems: about $7.4 billion gross
Oracle announced its Sun agreement on April 20, 2009, at $9.50 per share in cash. Oracle described the transaction as worth about $7.4 billion, or $5.6 billion net of Sun’s cash and debt; it completed the acquisition in 2010. Oracle’s announcement provides both figures.
Sun brought Java, Solaris, MySQL, servers, storage and other infrastructure assets. Unlike an applications deal, this purchase pushed Oracle toward an integrated hardware-and-software model: the company could optimize systems across applications, database software, operating systems and hardware. That logic was expressed in Oracle’s engineered-systems strategy. The lasting importance of the acquisition is best understood through those platforms and infrastructure capabilities, rather than assuming that every Sun product retained equal prominence inside Oracle.
6. Siebel Systems: $5.85 billion equity value
Oracle’s transaction summary put Siebel’s fully diluted equity value at $5.85 billion, based on a $10.66-per-share offer. It also gave a lower figure of approximately $3.61 billion net of Siebel’s cash. Oracle announced the deal in September 2005 and completed it on January 31, 2006. The distinction between equity value and net value is explicit in Oracle’s transaction summary.
Siebel added a leading customer relationship management platform. Combined with Oracle’s ERP, middleware and database businesses, CRM strengthened the company’s ability to sell software across both back-office operations and customer-facing work. Its role makes more sense as part of Oracle’s wider applications portfolio buildout than as an isolated product purchase.
7. MICROS Systems: about $5.3 billion gross
Announced June 23, 2014, the MICROS transaction was valued at approximately $5.3 billion, or $4.6 billion net of cash, according to Oracle’s announcement. MICROS supplied software and hardware used in hospitality and retail, including point-of-sale environments.
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MICROS widened Oracle’s reach into industry-specific operations and physical customer-service settings. It contrasts with Sun: Sun expanded Oracle’s control of technology infrastructure, while MICROS added vertical-market software, hardware and distribution in sectors with specialized day-to-day workflows.
8. Hyperion Solutions: about $3.3 billion
Oracle announced its Hyperion agreement on March 1, 2007, at $52 per share and approximately $3.3 billion. Hyperion’s software covered planning, budgeting, financial consolidation, operational analytics and compliance reporting. Oracle said at announcement that 12,000 companies used its software, including 91 of the Fortune 100. Those terms and figures appear in Oracle’s release.
Hyperion complemented Oracle’s database, business-intelligence and enterprise-applications products by adding a strong performance-management layer. It helped Oracle serve customers’ planning and reporting needs alongside the systems that recorded their transactions.
9. Taleo: about $1.9 billion net of cash and debt
Oracle announced the Taleo acquisition on February 9, 2012, at $46 per share, valuing it at approximately $1.9 billion net of cash and debt. Taleo brought cloud-based talent-management and recruiting software. Oracle’s announcement describes the offer and valuation.
Taleo extended Oracle’s human-resources strategy into recruiting and talent management. That is narrower than PeopleSoft’s broad ERP and HR platform: the two deals added different layers of the employee lifecycle and should not be treated as interchangeable acquisitions.
10. Acme Packet: about $1.7 billion net of cash
Oracle announced its Acme Packet agreement on February 4, 2013, at $29.25 per share, describing the value as approximately $1.7 billion net of cash. Acme Packet supplied session-border-control technology used in communications networks. Oracle’s announcement is the basis for the ranking figure.
The acquisition strengthened Oracle Communications’ technology for service providers and enterprises. Some older rankings use a higher figure of about $2.1 billion, reflecting a different valuation convention; Oracle’s cited net-of-cash figure is the one used here, not evidence that the deal was announced at the same gross value.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the acquisitions reveal about Oracle’s strategy
The sequence is less a list of unrelated purchases than a widening set of adjacent capabilities. The approximate periods below group the deals by the role they played, not by a claim that Oracle followed a single fixed plan.
- 2004–2008: enterprise applications and middleware. PeopleSoft, Siebel and Hyperion expanded ERP, CRM and performance management, while BEA supplied middleware. Together, they moved Oracle toward a fuller enterprise-software portfolio.
- 2009–2010: infrastructure and integrated systems. Sun added operating systems, Java, databases and hardware, supporting a strategy that joined software and engineered systems.
- 2012–2014: cloud, communications and vertical software. Taleo brought cloud talent tools, Acme Packet added communications-network technology, and MICROS added hospitality and retail operations.
- 2016: cloud ERP at broader market scale. NetSuite gave Oracle a major cloud business-applications platform with reach among smaller and midsize organizations.
- 2021–2022: healthcare. Cerner expanded Oracle into hospital and health-system information technology, an industry with its own regulatory and operational demands.
Near misses and limits of the ranking
RightNow, a cloud customer-service software company, is a notable near miss. Oracle announced it at approximately $1.5 billion net of cash and debt, below the $1.7 billion net-of-cash Acme Packet figure and Taleo’s $1.9 billion net-of-cash figure; see Oracle’s RightNow announcement. Acquisitions with undisclosed prices cannot be reliably placed in a value ranking, and purchases made by companies Oracle later acquired are not counted as direct Oracle acquisitions here.
Older lists that place PeopleSoft first predate the Cerner agreement and its 2022 closing. Nor does purchase price measure strategic impact: Sun’s infrastructure assets, NetSuite’s cloud applications and Cerner’s healthcare systems changed different parts of Oracle’s business. A brand’s persistence or disappearance alone cannot establish whether an acquisition met its financial or strategic goals.
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