List of semiconductor IP core vendors. The following is a list of notable vendors in the business of licensing IP cores.

Artificial Intelligence / Machine Learning / GEMM Accelerators
 Akeana

Analog-to-digital converters (ADC)
 Cadence Design Systems
 Cosmic Circuits
 Dolphin Integration
 S3 Group
 Synopsys

Broadband modem and error correction
 Cadence Design Systems
 CEVA, Inc.
 IMEC
 On2 Technologies (through acquisition of Hantro)
 Synopsys (through acquisition of Virage Logic)
 Tensilica (now part of Cadence Design Systems)

Digital-to-analog converters (DAC)
 Cadence Design Systems
 Cosmic Circuits (now part of Cadence Design Systems)
 Dolphin Integration
 S3 Group

Digital signal processors (DSP)
 Synopsys - ARC
 Tensilica - Xtensa (now part of Cadence Design Systems)

DRAM

DRAM controllers
 Actel
 Altera
 Arm Holdings
 Barco Silex
 Cadence Design Systems (through acquisition of Denali Software)
 Faraday Technology
 Lattice Semiconductor
 Rambus
 Synopsys
 Xilinx (acquired by AMD)

DRAM PHYs
 Arm Holdings
 Cadence Design Systems (through acquisition of Denali Software)
 Synopsys (through acquisition of Virage Logic)

High-bandwidth memory - HBM PHYs
 eSilicon
 Rambus
 Synopsys

Hybrid memory cube - HMC Controllers
 Open-Silicon
 University of Heidelberg

Communication IP

Network-on-chip (NoC) / On-chip interconnect
 Akeana
 Arteris IP
 Arm Holdings

Bluetooth SW stack, link layer, and PHY
 Arm Holdings (through acquisition of Dicentric and Sunrise Micro Devices)

Ethernet PHY
 Arm Holdings (through acquisition of Artisan Components)
 Cadence Design Systems

V-by-One
 Socionext - HV Series

General-purpose microprocessors
 Akeana
 Andes Technology, Codasip, SiFive, and others - RISC-V
 Arm Holdings - Arm Cortex and Neoverse processor cores
 CEVA, Inc. - CEVA-X DSP
 Dolphin Integration - 8051, 80251
 eSi-RISC - eSi-RISC
 Freescale and others - ColdFire
 IBM and others - PowerPC/Power ISA
 Infineon Technologies - TricoreA
 MIPS Technologies - MIPS architecture
 OpenCores - OpenRISC
 Renesas - SuperH
 Socionext - Fujitsu FR
 Sun Microsystems and others - OpenSPARC
 Synopsys - ARC
 Tensilica - Xtensa (now part of Cadence Design Systems)
 Western Design Center - 6502, 65816, 65xx
 Xilinx (acquired by AMD) - MicroBlaze

Graphics processing units (GPU)
 AMD
 Arm Holdings
 Imagination Technologies
 Intel
 NVidia

FPGA
 Altera
 Xilinx (acquired by AMD)

Embedded FPGA (eFPGA)
 Menta SAS

HDMI
 Silicon Image
 Synopsys

ISP
 Silicon Image
 Socionext - Milbeaut

I/O pad libraries
 Arm Holdings (through acquisition of Artisan Components)
Faraday Technology
 Synopsys
 TSMC

On-chip SRAMs
 Arm Holdings (through acquisition of Artisan Components)
 Dolphin Integration
 eSilicon
 Synopsys (through acquisition of Virage Logic)

Phase-locked loops (PLL)
 Arm Holdings (through acquisition of Artisan Components)
 Cadence Design Systems
 CEVA, Inc.
 Cosmic Circuits
 S3 Group
 TSMC

Power management
 S3 Group
 Cosmic Circuits
 Dolphin Integration
 SiliconGate Lda

Serial ATA (SATA) controllers
CEVA, Inc.
 Synopsys Inc.

Standard cell libraries
 Arm Holdings (through acquisition of Artisan Components)
 Faraday Technology
 NanGate
 Silvaco (through acquisition of Dolphin Integration's libraries)
 Synopsys

Video processors and computer graphics
 Arm Holdings (through acquisition of Falanx and Logipard)
 CEVA, Inc.
 Chips&Media Specializes in video codecs, image signal processing, and deep learning-based computer vision system (super-resolution).
 Google (through acquisition of On2 Technologies)
 Imagination Technologies
 intoPIX - Specializes in lightweight low latency image, video and sensor compression, including JPEG XS IP, TicoRAW IP and others.
 Silicon Image
 Socionext - HEVC/H.265, SEERIS 2.5D Graphics IP
 Vivante Corporation (offers GPU IP solutions for applications in the mobile, consumer, automotive, embedded, real time/mission critical, and home entertainment markets.)

References

Electronic design
Semiconductor IP cores