investment grade universe

I've been asked for a listing of companies that I would consider to be investment grade.

I've cobbled together the following, but recognise that it might not be 100% conclusive...it's just a list I jotted down off the top of my head.

[Note: (*) denotes stock I own]

LARGE CAP
ABC
AIO
ALS (*)
AMC
AMP
ANN
ANZ (*)
APA
ASX
AZJ (*)
BXB
CBA (*)
CCL
CGF (*)
COH
CPU
CRZ (*)
CSL
CTX (*)
DJS
FLT (*)
FOX
GNC
IAG (*)
JHX
MQG (*)
MYR
NAB
ORI
RHC (*)
RMD (*)
SEK
SHL
TAH
TCL (*)
TLS
TTS
WBC
WDC (*)
WES (*)
WOW (*)
WRT


SMALL CAP
ALQ
ARP (*)
AUB (*)
BRG (*)
COF (*)
CRH (*)
DLX (*)
DTL (*)
EMB
GWA (*)
HIL
IFL (*)
IRE
ISU
IVC
KOV (*)
MND
MRM
NVT
ONT (*)
PMP (*)
PMV
PPT
PRT (*)
REA
REH (*)
SAI (*)
SDI (*)
SFH (*)
SGN (*)
SKE (*)
SMX
SUL
SXL
TGA
TME
TPI (*)
VRT (*)