3M stock ends the day slightly lower at the close

On September 21, 2026, 3M stock closed at USD 165.34 on the NYSE, down about 0.3 percent from the prior close while the broader market was mixed. Investors continued to weigh legal settlement overhang and valuation debates ahead of the company’s next earnings update on October 20, 2026.

3M stock closed at USD 165.34 on the NYSE on September 21, 2026, slipping roughly 0.3 percent from its prior close as the shares ended the regular session modestly lower. Compared with the S&P 500, which was little changed on the day per exchange data, the stock underperformed slightly as investors continued to reassess its risk profile.

September 21, 2026 in numbers

3M Company Inc. (ISIN US88579Y1010, NYSE: MMM) began the session near its prior closing level before easing to finish at USD 165.34, a move that left it a few dollars below its recent highs and broadly in the middle of its 52-week range per NYSE and Nasdaq data. Intraday, the shares fluctuated in a relatively narrow band, with the day’s high only modestly above the close and the low not far below it, reflecting a calm trading pattern rather than sharp swings. Trade volume on the NYSE was close to its typical daily level reported by major quote services, suggesting neither pronounced accumulation nor heavy selling pressure during the session.

As Simply Wall St noted in a valuation review dated September 21, 2026, ongoing legal settlements and updated 2026 financial targets remain central themes for how investors gauge 3M’s prospects, even when the daily price move is small. That backdrop helped frame Monday, September 21, 2026 as another day in which the stock tracked broader industrial peers but with a continued discount reflecting litigation overhang and debates over whether the shares are undervalued relative to those risks.

After the bell and next steps

After the close on September 21, 2026, the shares were last quoted around their regular-session level in light after-hours trading on the NYSE, indicating no significant immediate reaction beyond the modest decline seen earlier in the day. According to the earnings calendar at Yahoo Finance, 3M’s next earnings release is scheduled for October 20, 2026, an event that is likely to refocus attention on how its updated 2026 targets and legal provisions translate into reported revenue and profit trends. Until then, day-to-day trading is set to remain sensitive to shifts in broader industrial sentiment and interest-rate expectations, with the next U.S. trading day on September 22, 2026 providing the next opportunity for investors to react to fresh macro or sector news.