Back side:

Google H1C2M Titan M security chip

STMicroelectronics ST33J2M0 ARM SecureCore microcontroller

Qualcomm WCN3990 wireless combo SoC

Qorvo QM78012 RF fusion module

Qualcomm SDR660 RF transceiver

NXP PN81B, probably an NFC controller w/ Secure Element

Murata SWUA 370 90 and Qualcomm PM670 PMIC