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NYSE resolves technical issue, trading resumes in affected symbols

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The New York Stock Exchange resolved a "critical" technical issue Wednesday that led to 199 ticker symbols being suspended for trading.

"NYSE experienced a technical issue in one trading unit, which affected a subset of symbols listed on our Market Status website here. All open orders, including MOC and LOC orders, were cancelled. Trading has resumed in those symbols at 1:17 pm ET and all systems are now operating normally," the NYSE said in its systems status page.

The issues affected one trading unit with the same symbols. Trades in those symbols continued to come through other market centers.

Both the Nasdaq and BATS stock exchanges had declared self-help against the NYSE amid the technical problems. A self-help exception allows trading centers to bypass an automated trading center that is experiencing system problems, according to the SEC.

NYSE believes the stocks affected were traded by Citadel KCG at Post 5, said NYSE spokesperson Kristen Cause. The area of the trading floor was roped off as the issue was addressed.

Cause told CNBC that she believes the issue is linked to the NYSE's own system but it will continue to look for the root cause.

Tickers like the Bank of Montreal and Agilent Technologies were affected.

— Reuters contributed to this report. This story has been updated to reflect a more precise definition of self-help.

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Symbols affected by May 18 NYSE issues

Ticker Ticker Ticker Ticker Ticker
ACP CIB GMTA NBB RSPP
ADC CPA GNL NCS SBNA
AFT CYS GOF NCT SBNB
AGM CYS PRA GOL NCT PRB SGM
AGM A CYS PRB GPT NCT PRC SLG
AGM PRA DBL GPT PRA NCT PRD SLG PRI
AGM PRB DHF GSL PRB NEWM SLTB
AGM PRC DHG HHY NHA SNOW
AIF DPG HIO NHF SNR
AIT DSE HTA NRZ SQM
AJX DSL HTGC NSM SRG
ANH DUC HTGX NUE SSW PRC
ANH PRA DX HTGY NXRT SSW PRD
ANH PRB DX PRA HTGZ NYRT SSW PRE
ANH PRC DX PRB HYI OMF SSWN
ARP EC HYT ORAN STO
ARP PRD EDR IBA PAI STON
ARP PRE EGF IGI PCN TCO
AVAL EGIF ISD PDI TCO PRJ
AWF EHI JHI PFL TCO PRK
AYR ELLI JHS PFN TIER
AZUR ENS JLL PFSI TOT
B EOCA JW B PHK TRNO
BBN EOCC KIO PHT TRNO PRA
BCR ESNT KOF PMT TS
BCX FHY KST PRLB TSI
BGB FIF KW PTY TSLF
BGX FIG KWN RAS TSQ
BLW FMX LNC RAS PRA TSU
BMO FN LNC WS RAS PRB UMH
BSAC FPO LND RAS PRC VJET
BSL FPO PRA MCC RBC VLRS
BSMX FSIC MDLY RDS A VLT
BTZ FTAI MGP RDS B WAC
CDR GFF MHY RFT WBK
CDR PRB GGB MNR RFTA WEA
CFR GGG MNR PRA RSO WOR
CFR PRA GGM MNR PRB RSO PRA XHR
CHCT GLOG PRA MORE RSO PRB ZTR
CHGG GMT MTD RSO PRC