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BlackLine was founded in 2001 by Therese Tucker, a former CTO at SunGard Treasury Systems. The initial goal was to help customers replace their use of Excel with a suite of accounting software.
The company functioned with no outside funding until 2013 when the private equity firm, Silver Lake Partners invested more than $200 million in the company.
BlackLine reached an agreement to form a strategic alliance with the financial consulting firm McGladrey, in 2015. As part of the alliance, the companies began offering a business process as a service (BPaaS) platform.
The company's IPO was October 28, 2016; they're listed on the Nasdaq under the symbol BL.
Runbook acquisition
In September 2016, the company acquired its European competitor, Runbook for $34 million.
Runbook marketed a dashboard software application program for SAP; before it was acquired by BlackLine.
The software's "automation of recurring financial processes" adds "visibility and transparency" and strengthens "internal controls and compliance documentation" of data maintained by SAP.
SAP agreement
In 2018 BlackLine reached an agreement with SAP for the latter "to resell BlackLine's.. cloud-based finance and accounting solutions" as part of "SAP Solution Extensions."
Rimilia acquisition
In October 2020, the company acquired UK-based accounts receivable automation company Rimilia for $150 million.
Rimilia's cloud -based SaaS platform "uses AI to accurately apply payments to customer's invoices with any ERP system".
WiseLayer
In December 2025, it was announced that BlackLine had acquired WiseLayer, a New York –based artificial intelligence company specialising in AI agents for automating accounting processes. The transaction, for which financial terms were not disclosed, was intended to support the integration of AI-driven capabilities into BlackLine’s financial operations software.