<SEC-DOCUMENT>0001072613-21-000247-index.html : 20210212
<SEC-HEADER>0001072613-21-000247.hdr.sgml : 20210212
<ACCEPTANCE-DATETIME>20210212162642
ACCESSION NUMBER:		0001072613-21-000247
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20210212
DATE AS OF CHANGE:		20210212

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Hyliion Holdings Corp.
		CENTRAL INDEX KEY:			0001759631
		STANDARD INDUSTRIAL CLASSIFICATION:	TRUCK & BUS BODIES [3713]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-90949
		FILM NUMBER:		21628013

	BUSINESS ADDRESS:	
		STREET 1:		1202 BMC DRIVE, SUITE 100
		CITY:			CEDAR PARK
		STATE:			TX
		ZIP:			78613
		BUSINESS PHONE:		(833) 495-4466

	MAIL ADDRESS:	
		STREET 1:		1202 BMC DRIVE, SUITE 100
		CITY:			CEDAR PARK
		STATE:			TX
		ZIP:			78613

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Tortoise Acquisition Corp.
		DATE OF NAME CHANGE:	20181120

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Karpus Management, Inc.
		CENTRAL INDEX KEY:			0001048703
		IRS NUMBER:				161290550
		STATE OF INCORPORATION:			NY
		FISCAL YEAR END:			0630

	FILING VALUES:
		FORM TYPE:		SC 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		183 SULLY'S TRAIL
		CITY:			PITTSFORD
		STATE:			NY
		ZIP:			14534
		BUSINESS PHONE:		5855864680

	MAIL ADDRESS:	
		STREET 1:		183 SULLY'S TRAIL
		CITY:			PITTSFORD
		STATE:			NY
		ZIP:			14534

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	KARPUS MANAGEMENT INC
		DATE OF NAME CHANGE:	19971029
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>karpus-sch13g_18453.htm
<DESCRIPTION>KARPUS INVESTMENT MGT / HYLIION HOLDINGS (FKA TORTOISE ACQUISITION CORP) - SCHEDULE 13G/A(#1)
<TEXT>
Document 1 - file: karpus-sch13g_18453.htm

</DOCUMENT>
</SEC-DOCUMENT>