Iron Mountain stock heads into the open after a 0.8 percent gain

At the close on September 15, 2026, Iron Mountain stock finished at USD 112.04 on the NYSE, up about 0.8 percent for the day. The move left the shares nearly 17 percent below their 52-week high, while broader US indices were little changed in that session.

Iron Mountain stock closed at USD 112.04 on the NYSE on September 15, 2026, marking a gain of roughly 0.8 percent versus the prior session.

September 15, 2026 in numbers

Iron Mountain Inc. (ISIN US46284V1017, NYSE: IRM) recorded a closing price of USD 112.04 on the NYSE on September 15, 2026, after adding about 0.76 percent from a prior close near USD 111.20 in that session per exchange data cited in a recent market wrap from Ad-hoc-news. The same report highlighted that this level left the shares 16.9 percent below their 52-week high of USD 134.68 reached on June 24, 2026, underlining that the stock has climbed meaningfully year to date but remains some distance from its recent peak. Within the September 15, 2026 session, the price action stayed broadly in an intraday band around USD 111 to USD 113, with the USD 112.04 close situated comfortably inside that range, confirming a relatively steady trading day for the shares as noted by Ad-hoc-news. Against this backdrop, the broader US market was largely flat in the same session, with the tech-heavy Nasdaq Composite edging only 3.15 points lower to close at 25,978.43 on September 17, 2026, according to a market summary from Zacks, indicating that Iron Mountain traded with a modest individual gain while the main indices remained broadly unchanged earlier in the week.

Looking ahead today

For today, September 18, 2026, no new company-specific releases or scheduled events such as earnings, annual meeting, or index changes for Iron Mountain are highlighted in the latest publicly available calendars and news reports, so the stock heads into the open mainly with the carryover of its recent performance profile and valuation context from earlier in the week. Broader US equity sentiment may take cues from ongoing macro and sector developments, with recent coverage from Zacks pointing to a generally steady backdrop in major indices that could frame trading conditions for shares like Iron Mountain today.