Sixth Street Specialty Lending

Sixth Street Specialty Lending

Sixth Street Specialty Lending launched in 2011 as the first permanent-capital vehicle spun out of Sixth Street Partners, the investment firm Alan Waxman, David Stiepleman, and a team of ex-Goldman Sachs partners established the year prior. The BDC went public in 2014, listing on the NYSE under ticker TSLX, and remains externally managed by Sixth Street Specialty Lending Advisers. Unlike many BDCs that rely on broadly syndicated loan markets, this firm's sourcing pipeline runs directly through the broader Sixth Street platform — a multi-strategy manager with offices in New York, San Francisco, Dallas, and London that originates across credit, growth equity, and real estate. The portfolio targets U.S. middle-market companies with $10 million to $250 million in EBITDA, emphasizing sponsor-backed deals where Sixth Street's platform relationships surface transactions before they reach auction. The firm writes directly originated senior secured first-lien loans, with selective exposure to second-lien and mezzanine positions. Confirmed positions include loans to enterprise software provider Aptean (per the firm's quarterly filings) and healthcare services platform Avalign Technologies, alongside investments in companies like ThoughtFocus and Parts Town. The geographic footprint extends across North America, with the majority of portfolio companies concentrated in the technology and healthcare sectors. As of the most recent public filings, the portfolio held positions across more than 90 companies, with total assets crossing $3.2 billion. The investment committee draws on Sixth Street's broader platform of over 600 professionals, including 200-plus investment staff across credit, growth, and real estate. The firm maintains a co-investment structure that allows the BDC to participate alongside Sixth Street's institutional funds — a setup that expanded deal capacity without proportional headcount growth. In April 2023, the firm increased its credit facility to $2.385 billion, adding four new lenders to its bank group (per Sixth Street Specialty Lending, April 2023). The structural differentiator is the public-private pipeline: Sixth Street Partners originates $30–$40 billion in annual deal volume, and the BDC can selectively co-invest in deals its private funds underwrite. This architecture gives the public vehicle access to directly originated, sponsor-backed credits that most BDCs — which operate as standalone originators — cannot replicate. The arrangement is governed by SEC co-investment exemptive relief, which requires the BDC to receive allocation pro rata with private funds, a constraint that institutional allocators view as either a governance protection or a flexibility limitation depending on their posture toward affiliated-transaction risk.