The Finviz market data page provides authoritative and directly relevant institutional ownership information for SLV, showing Jane Street's holdings and percentage shares. This source is both credible and focused specifically on the ETF in question. A social media post independently mentions Jane Street holding approximately 20.6 million shares in SLV, which is consistent with the Finviz data. While the official BlackRock site lists the ETF itself and provides authoritative context, it does not contain detailed shareholder positions; however, its existence validates SLV's prominence and plausibility of large institutional holdings. Other sources provide general market context without contradicting the claim. Although the social media post has lower authority, its alignment with the Finviz institutional ownership figures strengthens the likelihood that Jane Street is indeed the largest holder with roughly 20.6 million shares. There are no credible sources providing contradictory evidence, and the claim fits with known patterns of Jane Street being a major liquidity provider and ETF holder.