Photo by Marco Bello/Getty ImagesArk Invest's Innovation ETF realized $3.5 billion in losses in the fiscal year ending July 2024.Ark Invest saw an accumulated loss of $22 billion across its suite of ETFs.Cathie Wood said in an X post this summer that trading losses are useful for offsetting future taxes.Cathie Wood's Ark Invest recently filed its annual report for its fiscal year ending July 31, and it reveals some steep losses.Ark's flagship Innovation ETF realized $3.5 billion in losses from July 31, 2023, through July 31, 2024.Across Ark's suite of eight innovation and disruption-focused ETFs, the total accumulated loss was $21.7 billion, according to the annual report.The past few years have been tough for the kinds of speculative growth stocks Ark funds have focused on.