Grayscale, the world's largest digital asset manager, is increasing its exposure to Cardano (ADA) amid institutional adoption.Cardano now comprises 20% of Grayscale's Smart Contract Platform Ex-Ethereum Fund, making it the second-largest asset in the fund.Hashdex has also added Cardano to its Nasdaq Crypto ETF, allowing institutional investors to invest in the asset.Speculation remains on whether a Cardano spot ETF will be approved, with only 25% of traders on Polymarket believing it will receive approval in 2025.