Private equity firm Knox Capital Holdings LLC is investing in forensic services provider HaystackID. Financial terms of the deal were not disclosed.

HaystackID offers electronic discovery and forensic services to law firms and corporations in the U.S. and internationally. Founded in 2011, the Boston-based company provides a range of services including forensic collection and data preservation, forensic analysis, data processing, triage, electronic discovery readiness and web-based legal review. The target will use Knox Capital’s investment to fund strategic acquisitions and accelerate growth. HaystackID represents the PE firm’s third transaction.

“With three investments thus far, we’ve put our thesis to work,” states Knox Capital founder Alex Gregor. “Our team will continue seeking out companies with fundamental value in need of operating and capital resources to accelerate growth without burdensome investment timelines.”

Knox Capital is a middle-market private equity firm based in Chicago. The firm looks to provide capital and operating resources for entrepreneur-owned businesses using flexible investment horizons. Knox Capital partnered with private investors and Maranon Capital on the investment backing HaystackID. Knox Capital’s portfolio of companies also includes electrical pump manufacturer Stancor Inc. and gas turbine maintenance provider TRS Global.

Among recent developments in the data collection and data security sector includes: PCM Technology Solutions UK Ltd. buying The Stack Group; ManTech International Corp. (Nasdaq: MANT) acquiring cloud service management provider InfoZen for $180 million; Honeywell International Inc. (NYSE: HON) purchasing Nextnine; Open Text Corp. (Nasdaq: OTEX) buying Guidance Software Inc.; Zix Corp. (Nasdaq: ZIXI) acquiring email encryption provider Entelligence Messaging Server; and Symantec Corp. (Nasdaq: SYMC) announcing plans to buy Fireglass for undisclosed terms.