(Bloomberg) -- Ark Investment Management’s miserable week showed signs of easing on Friday, as its flagship exchange-traded fund battled to avoid a fifth day of declines.The ARK Innovation ETF (ticker ARKK) fluctuated as of 11 a.m. in New York, after earlier sliding as much as 2.7%. The fund has tumbled more than 15% this week amid a technology selloff that was triggered by rising Treasury yields, putting pressure on high-flying stocks. One of those shares is electric-car maker Tesla Inc., which remains as the ETF’s biggest holding.The last time Ark founder Cathie Wood suffered a run this bad was almost a year ago, during the worst of the Covid-fueled mayhem. Her main fund is now 11 times larger than it was then. It got close to erasing its gains for 2021 this week after soaring as much as 26% since the end of December.Assets in the ETF have slumped by $4.9 billion this week to $23.3 billion, according to data compiled by Bloomberg. The figure doesn’t include flows from Thursday, when ARKK dropped 6.4% for its worst day in almost six months. Investors pulled about $200 million from the fund in Wednesday trading. That brings total weekly outflows to $638 million, on pace to be the worst on record.“Money that is ‘easy come’ tends to be money that is ‘easy go’,” said Ben Johnson, Morningstar’s global director of ETF research. “You’re going to see similar, if not potentially greater, market impact on the way down, especially given that this is an actively managed ETF and a fully transparent one. The market is hanging on their every move, they’re watching their every move.”Bearish bets against the ETF continue to grow, with short interest now accounting for more than 4% of available shares, according to data from IHS Markit Ltd.Michael Purves, chief executive officer at Tallbacken Capital Advisors, said in a note Thursday that his firm is taking profits on ARKK puts, but “will look to re-enter a second bearish trade on a bounce.”Ark Investment slipped to the eighth place among the largest exchange-traded fund issuers in the $5.9 trillion industry, after becoming the seventh biggest earlier this month. Total ETF assets for the company are now just shy of $53 billion, down from more than $60 billion at the prior peak.Wood’s $10.6 billion ARK Genomic Revolution ETF (ARKG) is now flat for the year and lost $154 million on Wednesday for its third straight day of outflows. At the same time, traders pulled another $48 million from ARK Next Generation Internet ETF (ARKW).For more articles like this, please visit us at bloomberg.comSubscribe now to stay ahead with the most trusted business news source.©2021 Bloomberg L.P.