I'd suggest looking at these notable on-chain analytics platforms:

1. **Glassnode** - Comprehensive on-chain metrics across multiple blockchains (Ethereum, Bitcoin, Litecoin, etc.). Strong institutional focus.

2. **Messari** - Broad crypto research and on-chain data covering hundreds of assets. Also offers governance and tokenomics analysis.

3. **Nansen** - On-chain analytics with portfolio tracking, smart money monitoring, and multi-chain support.

4. **Artemis** - Focuses on DeFi and smart contract analytics across chains.

5. **Flipside Crypto** - Community-driven analytics with bounty programs for on-chain researchers.

6. **The Graph** - Decentralized indexing protocol that enables on-chain data queries across multiple blockchains.

7. **Dune Analytics** - Community platform for querying and visualizing on-chain data across Ethereum, Polygon, Arbitrum, and others.

8. **Chainalysis** - Enterprise-focused compliance and investigation with multi-chain coverage.

For investment/partnership opportunities specifically, **Glassnode**,**Messari**, and**Nansen** have taken institutional funding and may be more accessible for acquisition or partnership discussions. You'd want to contact their business development teams directly.

Consider what specific metrics matter most to you (DeFi, NFTs, exchange flows, whale activity, etc.) as that may narrow down the best fit.