Monday’s trading session produced a series of sizable swings across the market-cap spectrum. News items ranging from a takeover proposal to analyst upgrades and capital-market transactions were associated with notable percentage moves in individual stocks.
Large-cap movers
Among large-cap listings, Topbuild Corp (BLD) led the group with a significant advance after an announcement that QXO will acquire TopBuild in a stock-and-cash transaction valued at $17 billion - the stock rose 16.14% on the day. Kaspi.kz AO ADR (KSPI) added 11.11%. Semiconductor and security-related names also moved higher: Globalfoundries (GFS) gained 7.8%, Okta Inc (OKTA) climbed 4.8% following a Barclays upgrade citing demand in identity security, and Marvell Technology Group Ltd (MRVL) rose 3.92% after GF Securities upgraded the stock on expectations of data center growth. Other large-cap swings included Vector Acquisition (RKLB) up 5.4% and Atlassian Corp Plc (TEAM) up 5.01%.
On the downside in this bracket, Silversun Tech (QXO) declined 8.1%, Talen Energy Corp (TLN) fell 4.37%, and New Providence Acquisition Corp N (ASTS) dropped 8.17%.
Mid-cap activity
Mid-cap names experienced pronounced volatility. Nektar Therapeutics (NKTR) jumped 18.28% after reporting extended alopecia areata trial results at 52 weeks. MaxLinear Inc (MXL) rose 13.73%. Inflection Point Acquisition II (USAR) was up 14.04% in conjunction with news that USA Rare Earth will acquire Serra Verde for $3.1 billion in cash and stock. Oaktree Acquisition Corp (HIMS) climbed 8.85%, Legend Biotech Corp (LEGN) added 9.47%, and Hertz Global Holdings NAQ (HTZ) gained 4.71%.
Meanwhile, several mid-cap issues moved lower: Babcock & Wilcox Enterprises (BW) fell 3.81%, Agios Pharmaceuticals (AGIO) dropped 21.93%, and Fermi America LLC (FRMI) slid 18.93%.
Small-cap leaders and decliners
Smaller-cap stocks recorded some of the day’s largest percentage gains. Compass Pathways Plc (CMPS) surged 36.79%, ATAI Life Sciences BV (ATAI) gained 27.67%, Aevex Inc (AVEX) rose 25.97%, GH Research (GHRS) advanced 25.03%, and POET Tech NAQ (POET) climbed 23.55%. Additional small-cap winners included Sila Realty Trust (SILA) up 18.92%, GoGreen Investments (LZM) up 17.76%, and Candel Therapeutics (CADL) up 11.93%.
Notable declines among smaller issues included Sidus Space (SIDU), which dropped 19.99% after pricing a $58.5 million stock offering at $4.35 per share, and Pono Capital Two (SBC), which fell 17.59% as a shareholder announced an intention to sell 3.1 million SBC Medical shares at $3.25 each.
Overall, Monday’s session highlighted how corporate actions - acquisitions, analyst upgrades and capital raises or planned share sales - continued to be primary drivers of intraday performance across market-cap tiers.