The Korea Exchange (KRX) has abruptly postponed the launch of its ambitious 7 a.m. pre-market trading session to the end of 2027, bowing to practical hurdles including IT system development burdens at securities firms and labor union opposition. The after-market session covering afternoon trading hours, however, will proceed as originally planned and open on September 14.
KRX officially announced on the 19th via press release that “the pre-market launch date has been changed to the end of 2027.” The exchange reached a consensus on the schedule adjustment during a meeting with the heads of major securities firms held the same day.
At the core of this decision lies the complexity of developing a “single system architecture.” The exchange’s envisioned final trading framework involves the seamless transfer of unfilled orders within a single system spanning the pre-market (7:00 a.m.–7:50 a.m.), regular session (9:00 a.m.–3:30 p.m.), and after-market (4:00 p.m.–8:00 p.m.). However, the pre-market in particular has faced concentrated technical challenges because its hours overlap with the pre-market session already operated by alternative trading system (ATS) Nextrade (NXT) from 8:00 a.m. to 8:50 a.m.
When KRX’s pre-market closes at 7:50 a.m., Nextrade’s pre-market begins just 10 minutes later at 8:00 a.m. Industry observers have pointed out the considerable burden of perfectly processing unfilled orders and residual quantities within that narrow window. An industry source who requested anonymity said, “The IT operational burden, including handling unfilled pre-market quotes, was reportedly very significant,” adding that “many small and mid-sized securities firms are struggling with development, and expanded labor burdens are also a concern.”
In response, KRX appears to have pivoted to a strategy of first completing the unified system known as “One Board” to prevent all potential IT issues before launching the 7 a.m. pre-market. A KRX official explained, “To secure sufficient system development time, we had already postponed the launch once from June this year to September, but as industry concerns continued to be raised during the process, we decided to adjust the implementation schedule.”
The after-market, however, is moving full speed ahead. KRX plans to open the after-market on September 14 as scheduled, independent of the pre-market, while finalizing the exact implementation date through working-level consultations with securities firms. The exchange will hold additional working-level meetings next week to coordinate details regarding the pre-market delay.
KRX had originally presented a blueprint to dramatically extend daily trading hours from 6 hours and 30 minutes to 12 hours by the end of last year, but the timeline has been repeatedly pushed back in the face of practical obstacles. The exchange maintains that building a 24-hour trading system is inevitable in the long term to prevent South Korea’s capital markets from falling behind in global competition, especially as the trend toward extended trading hours—led by the United States—becomes increasingly pronounced worldwide.
However, pushback from both inside and outside the market has been formidable. Earlier this year, the Korea Financial Investment Association sent an official opinion letter to KRX conveying member firms’ concerns about the trading hour extension. Securities industry labor unions have fiercely opposed the move, arguing it would expand on-site workers’ hours and increase the risk of financial incidents. Some unions have even staged rallies and overnight sit-ins in front of KRX headquarters demanding the plan be scrapped.
Opposition from retail investors is also growing. The Korea Stock Investors Alliance recently drew attention by sending a certified letter to KRX opposing the stock market trading hour extension. The group argued that extending trading hours to 12 or even 24 hours would create a market even more favorable to foreign and institutional investors, stating that “the vast majority of individual investors lack both the capacity and information to respond, so the gap will widen further compared to now.”
Meanwhile, at the meeting, KRX reaffirmed its commitment to pushing forward without disruption on shortening the stock settlement cycle from the current two business days (T+2) to one business day (T+1), alongside the trading hour expansion. A KRX official emphasized, “During the mock market operation, significant IT development and staffing burdens emerged, so we held the meeting with securities firm heads today and agreed to adjust the schedule. The exchange plans to strengthen the global competitiveness of the stock market infrastructure by advancing both trading hour expansion and settlement cycle shortening without disruption.”
KRX’s decision is seen as placing emphasis on gradual trading hour expansion through the after-market, rather than an overly ambitious simultaneous infrastructure overhaul. If the after-market launch in September successfully takes hold, the roadmap for sequentially introducing the pre-market by the end of 2027—in tandem with the “One Board” system build-out—is expected to materialize. With specific development timelines and staffing plans from securities firms set to be discussed further at next week’s working-level meeting, the final contours of the trading hour extension policy are likely to emerge.