Engine Ventures' Katie Rae Files $28.4 Million in Dual SPVs for Tough Tech

Two vehicles, one conviction

Katie Rae filed two SPV vehicles on August 13 through Engine Fund I. Engine Fund I SPV-J raised $25 million. Engine Fund I SPV-I raised $3.4 million. Together they represent $28.4 million in co-investment capital deployed alongside Engine's main fund into a specific portfolio company. Katie Rae is the CEO and managing partner of The Engine, a venture firm spun out of MIT that backs founders working on breakthrough science and engineering.

What The Engine invests in

The Engine was created with a specific thesis: most of the hardest technical problems — materials science, advanced manufacturing, energy storage, synthetic biology, climate hardware — require more time and capital than traditional VC structures can accommodate. The Engine provides patient capital, lab space, equipment access, and a network rooted in MIT's research ecosystem. Its portfolio includes companies working on fusion energy, new-generation batteries, novel materials, and industrial biology. The firm focuses on Seed and Series A, with follow-on capital through vehicles like the SPJs and SPIs filed on August 13.

Why dual SPVs in a single day

Filing two SPVs on the same day typically indicates the investor is consolidating co-invest capital from two different LP groups who committed at different check sizes or through different vehicles, both for the same underlying company. It is an operational detail, not a signal of two separate investments. The combined $28.4 million suggests significant co-investor demand for whatever company Engine is backing here.

What this means for founders

If you are building in deep tech — hardware, energy, advanced materials, biotech — understanding which VCs have dedicated programs for patient capital matters. General VC timelines and return expectations may not fit your development cycle. The Engine is explicitly designed for that gap.

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AngelLinx Intelligence | angellinx.ai