Here are some symbols that used to be available (maybe the last 18 months) and are no longer available now
[‘SSINQ’,‘APSG^11’,‘KRON^07’,‘WOOF^17’,‘MNIQQ’,‘TLRDQ’,‘PIRRQ’,‘MYL’,‘NBL’,‘CMPX^06’,‘SHLOQ’,‘ASFI’,‘TMX^12’,‘CETV’,‘LBYYQ’,‘CTEC^07’,‘BNE^10’,‘HKNI’,‘MIG^15’,‘ETFC’,‘TSU’,‘LU^06’,‘UN’,‘AMCRY^19’,‘CBL’,‘AMTD’,‘AMAG’,‘VVUSQ’,‘IMMU’,‘EOCCY’,‘ID^11’,‘ELGXQ’,‘ARRY^19’,‘GSH’,‘EMIS’,‘DDXSQ’,‘LADG10^18’,‘CRCUF’,‘EVTND’,‘BIPHD’,‘WMSI’,‘AMTD’,‘AKRXQ’,‘VVUSQ’,‘EOCCY’,‘ELGXQ’,‘ID^11’,‘SPIR’,‘IMMU’,‘ARRY^19’,‘HOMS^15’,‘BBX’,‘BBX’,‘BBX’,‘BBX’,‘BBX’,‘BBX’,‘GPOR’,‘BREW’,‘MNTA’,‘GMO’,‘BBX’,‘GMO’,‘LEAP^14’,‘BBX’,‘MNTA’,‘GMO’,‘LEAP^14’,‘GPOR’,‘BBX’,‘MNTA’,‘GMO’,‘CPTRF’,‘LEAP^14’,‘BBX’,‘WLGC’,‘NWGI’,‘BSTC’,‘PNTV’,‘MOBQD’, ‘CLHRF’,‘BPIGF’, ‘PTSC’, ‘CERT^09’, ‘BTE’, ‘NGAC^10’, ‘GFA’, ‘TMKOY’, ‘NSH^18’, ‘HTZ’, ‘DXIED’, ‘BBGP’, ‘IMUCD’, ‘FSR^12’, ‘SNRAD’, ‘INWK’, ‘BPIGF’, ‘BBGP’,‘SFEG’, ‘MRM^10’, ‘YGEHY’, ‘JAGGD’, ‘MRM^10’, ‘CIBHD’, ‘SNYFY’, ‘TOMZD’, ‘CCCL’, ‘GBOE’, ‘JAGGD’, ‘RST’, ‘HHT’, ‘REXN’, ‘WMGI’, ‘SITO’, ‘HGLI’, ‘STBK^10’, ‘SVBLD’, ‘UPZSD’, ‘BRTXQ’, ‘CHMT^17’, ‘LLEXQ’, ‘BITA’, ‘EMGC’, ‘BARZ’, ‘GNCIQ’, ‘ACTV^13’, ‘POTG’, ‘GLLK’, ‘FRAN’, ‘DNKN’, ‘CLASD’, ‘PACD’, ‘EACR’, ‘WEIN’, ‘MSTG’, ‘SNDY’, ‘CERE^16’, ‘MYOS’, ‘HCRSQ’, ‘LDHL’, ‘SDLPF’, ‘GARS’, ‘SDRMU’, ‘MNK’, ‘RTRX’, ‘GRAM’, ‘ESGC’, ‘MVNR^15’, ‘EPEGQ’, ‘RICE^17’, ‘GLDLF’, ‘RICE^17’, ‘PIH’, ‘LONE’, ‘MOBL’, ‘DNAX’, ‘MR’, ‘SERV’, ‘PFNX’, ‘AACH’, ‘VSLR’, ‘DM^19’, ‘CRCQQ’, ‘SKYS’, ‘ONDK’, ‘ALSWF’, ‘CHEK^20’, ‘ADRO’, ‘JCAP’, ‘AXGT’, ‘AIMT’, ‘FORK’, ‘MYOK’, ‘QPWRD’, ‘WINS’, ‘YIN’, ‘SBPH’, ‘INGIY’, ‘CTRCQ’, ‘ADSW’, ‘NTRP’, ‘HEBT’, ‘CGOTF’, ‘KAYS’, ‘MDTR’, ‘TRPX^20’, ‘ZEST’, ‘AKCA’, ‘YOGA’, ‘EMPK’, ‘ZMTP’, ‘SCBH’, ‘DLPH’, ‘HUD’, ‘IPICQ’, ‘AWSM’, ‘IPICQ’, ‘EDNT’, ‘PCRCD’, ‘CHAPQ’, ‘WRTC’, ‘ABCZY’, ‘DYMEF’, ‘WRTC’, ‘GRTDD’, ‘DLMV’, ‘WINR’, ‘AUG’, ‘TRWH’, ‘GNWSD’, ‘IMLFF’, ‘ADTFD’, ‘BBBMD’, ‘PRGCD’, ‘EVXXD’, ‘AYRSF’, ‘SKHRD’, ‘EQTXD’, ‘LVGO’, ‘TTLO’, ‘CIFAF’, ‘ATBPF’, ‘NPRUF’, ‘INOTD’, ‘PRCP’, ‘XL^18’, ‘IRET’, ‘RELV’,‘AHIX’, ‘ITEX’, ‘CSR^11’, ‘CONX^15’, ‘TAT’, ‘OPEN^14’, ‘GLIBA’, ‘SAEXQ’, ‘KTOV’, ‘KNMCY’,‘UECN’,‘SMICY’,‘TWMC’,‘BMR^16’,‘YRCW’,‘CLCT’,‘CHKAQ’,‘MEET’,‘MSBHY’,‘XAN’,‘RVLT’,‘SVCBY’,‘ALIAF’,‘GRIF’,‘SMRT’,‘PYXSQ’,‘TCO’,‘DNR’,‘BSY^18’,‘WYND’,‘VAL’, ‘GSB’, ‘TUESQ’, ‘PRSC’, ‘HOSSQ’, ‘BGGSQ’, ‘GEC’, ‘WINMQ’, ‘TSCDY’, ‘EE’, ‘CBKC’, ‘FRX^14’, ‘CEL’, ‘TIF’, ‘CHL’, ‘JCPNQ’, ‘NE’, ‘TLRD’, ‘FGPR’, ‘SIGM’, ‘LM’, ‘SAFB1^16’, ‘CLUB’, ‘SPN’, ‘CHA’, ‘EDPFY’, ‘CHU’, ‘AAXN’, ‘FSII^12’, ‘BCOM’, ‘UNTCQ’, ‘CXO’, ‘ASNA’, ‘RTWIQ’, ‘PEIX’, ‘MOVE^14’, ‘CTL’, ‘VRTU’, ‘SHLO’, ‘DRAD’, ‘PDLI’, ‘PTGCY’, ‘ATV’, ‘PTGCY’, ‘BCOM’, ‘BEAT’, ‘RTWIQ’, ‘PEIX’, ‘ATV’, ‘UNTCQ’, ‘CXO’, ‘SHLO’, ‘ASNA’, ‘PDLI’, ‘BDGE’, ‘SSPC’, ‘ZN’, ‘MOTV^08’, ‘SSPC’, ‘VCSY’, ‘SSPC’, ‘WEYL’, ‘SSNYY’, ‘ZN’, ‘SZEVY’, ‘VELCF^09’, ‘ZN’, ‘LGVN^09’, ‘MBND^13’, ‘COTE’, ‘BELM^10’, ‘CMGR^13’, ‘UNDT’, ‘CGNT^18’, ‘BTGI’, ‘CRGED’, ‘SCIL’, ‘LOGM’, ‘LNEGY^18’, ‘TLF’, ‘TNAV’, ‘ECT’, ‘PSTB^17’, ‘MTTCF’, ‘CCIHY’, ‘GRYO’, ‘CRNCY’, ‘ANFC’, ‘GCAP’, ‘ERBA’, ‘MCC’, ‘TBBC^16’, ‘ENT’, ‘RYPPD’, ‘TCRD’, ‘MCEP’, ‘RBCC’, ‘PER’, ‘MNKGD’, ‘FROG^13’, ‘GV’, ‘BXEFF’, ‘WPX’, ‘PER’, ‘UPZS’, ‘COHO’, ‘BMSN’, ‘ROYT’, ‘DYN^18’, ‘RESI’, ‘SOUL’, ‘RYCE’, ‘SCTY.^16’, ‘BFYT’, ‘OSB’, ‘AFH’, ‘HCFT’, ‘BCYP^20’, ‘FNBCQ’, ‘SAEX’, ‘HDS’, ‘SAEX’, ‘ECIGQ’, ‘BFGC’, ‘HDS’, ‘WUBA’, ‘EROS’, ‘EIGI’, ‘SALT’, ‘SNOW^17’, ‘NGHC’, ‘LXRP’, ‘APTEF’, ‘ECOP’, ‘UDFI’, ‘PE’, ‘JASNQ’, ‘TERP’, ‘BDGY’, ‘SBBX’, ‘CNXM’, ‘FCAU’, ‘AMEZY.1^17’, ‘FSB’, ‘MVC’, ‘FIT’, ‘CCR’, ‘DNRG’, ‘BUFF^18’, ‘BLKG’, ‘MJCO’, ‘DMPI’, ‘MGMBA’, ‘PTI’, ‘ARA’, ‘XOGAQ’, ‘BMCH’, ‘CTRA’, ‘MGEN’, ‘FBM’, ‘CFBI’, ‘UPLCQ’, ‘NVUS’, ‘TMPS’, ‘FBM’, ‘ROSE’, ‘FSCT’, ‘BRVVF’, ‘AMRH’, ‘MNLO’, ‘ADAC’, ‘TORC’, ‘KTNNF’, ‘DNJR’, ‘UMRX’, ‘WHLKY’, ‘CVIAQ’, ‘EIDX’, ‘BAYK’, ‘RVRA’, ‘CHAP’, ‘GTX’, ‘TRIN^19’, ‘PRNB’, ‘ACRGF’, ‘BOSQF’, ‘AVDR^19’, ‘PHVAF’, ‘ADSN’, ‘IONKF’, ‘AGEEF’, ‘ASDN’, ‘EVSI’, ‘HUSKF’, ‘GAPFF’, ‘WFTBF’, ‘MDRPF’, ‘CCC’, ‘PECK’, ‘PRVL’, ‘TGCDF’, ‘WSG’, ‘CORVF’, ‘LGHEF’, ‘EXLLF’, ‘SSPXF’, ‘CLSI’, ‘CSPS’, ‘AREXQ’, ‘CBMG’, ‘LBCC’, ‘CVLB’, ‘MDNAF’, ‘DGRLY’, ‘GUYFF’, ‘TMMFF’, ‘SEGN’, ‘CBYAA’, ‘IPATF’, ‘PSV’, ‘DBCP’, ‘TSCRF’, ‘RVDO’, ‘GPVRF’, ‘ORRLF’, ‘MRQRF’, ‘EANRF’, ‘EXLLD’, ‘CYRTF’, ‘DNRCQ’, ‘NEBLQ’, ‘SPNX’, ‘SNBP’, ‘KEYEF’, ‘PACDQ’, ‘QUTRD’, ‘IPATD’, ‘PACDQ’]