If you look through their portfolio half of the companies listed have been acquired. Quick look at their Physical Sciences section.
PHYSICAL SCIENCES
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Boston, MA
908 Devices, Inc.
Ultra compact, field portable chemical detection and analysis using Mass Spectrometry technology.
Wilmington, MA
Ahura Scientific, Inc.
Manufactures ultra-compact "optical engine" technology for hand-held instruments in homeland security, life sciences, process control, and telecommunications
Acquired by
Thermo Fisher Scientific, Inc.NYSE: TMO
Madison, WI
AlfaLight, Inc.
High powered diode lasers
Peabody, MA
ALIS Corporation
High resolution microscopy technology enabling the brightest beam available
Acquired by
Carl Zeiss SMT
Mt. Prospect, IL
ISCO International, Inc.
AMSE: ISC
High performance filter technology for wireless communications
Seattle, WA
Impinj, Inc.
NASDAQ: PI
Leader in UHF RFID chips, readers and reader systems
Austin, TX
Intelligent Reasoning Systems, Inc.
Monterey Park, CA
Kotura, Inc.
New York, NY - San Francisco, CA
Kilimanjaro Energy, Inc.
Technologies to capture, process and deliver atmospheric carbon dioxide
Albuquerque, NM
MicroOptical Devices, Inc.
Semiconductor surface emitting lasers
Acquired by
EMCORE Corp. NASDAQ: EMKR
San Mateo, CA
Movidius, Ltd.
Vision processor technology for mobile, wearable and industrial camera applications
Acquired by
Intel Corp.NASDAQ: INTC
St. Paul, MN
NiOptics Corporation
Light transmission components for back-lit display products
Acquired by
3MNASDAQ: MMM
Raleigh, NC
Nitronex Corporation
Building GaN RF power transistors for high power RF applications
Acquired by
Gaas Labs LLC.
Somerville, MA
Voxel8, Inc.
3D electronics printing using multpile materials
Allen, TX
Xtera Communications, Inc.
NASDAQ: XCOM
Optical telecommunication systems that are redefining network capacity and reach