<ul data-eligibleForWebStory="true">Several altcoins have shown strong double-digit gains in June despite overall market downturn.Newton (AB) leads with +113.73% gains, followed by SPX6900 (SPX) with +97.86%.Other notable gainers include WhiteRock (WHITE), WhiteBIT Token (WBT), and Hyperliquid (HYPE) with significant increases.Maple Finance, Kaia, and Klaytn also posted healthy gains, outperforming larger-cap assets.Altcoin market often mirrors Bitcoin's movements; sustainability of rallies depends on crowd sentiment.If retail investors fuel FOMO buying, it may lead to overheated sentiment and reversals; skepticism could extend rallies.Understanding crowd psychology is crucial during mixed signal periods; altcoins like Newton, SPX6900, and WhiteRock stand out.