<p>拉塞爾投資集團有限公司在最近向證券交易委員會提交的 13F 表格中披露，第一季度將其在 Marathon Digital Holdings, Inc.（NASDAQ:MARA - 免費報告）的持股減少了 95.6%。該公司在季度內出售了 1,547,823 股後，持有 71,008 股該商業服務提供商的股票。根據其最近的 SEC 文件，拉塞爾投資集團有限公司在 Marathon Digital 的持股價值為 817,000 美元。</p>
<p>獲取 <strong>Marathon Digital</strong> 警報：</p>
<ul>
<li>加密懷疑論者仍然可以通過這些風險限制 ETF 獲得豐厚收益</li>
</ul>
<p>其他一些對沖基金和機構投資者最近也增加或減少了在 MARA 的持股。Park Square Financial Group LLC 在第四季度收購了 Marathon Digital 的新股份，價值約 27,000 美元。CX Institutional 在第一季度收購了 Marathon Digital 的股份，價值約 68,000 美元。NewEdge Advisors LLC 在第四季度將其在 Marathon Digital 的持股增加了 28.9%。NewEdge Advisors LLC 現在擁有 4,640 股該商業服務提供商的股票，價值 78,000 美元，此前在該期間又購買了 1,040 股。Archer Investment Corp 在第一季度將其在 Marathon Digital 的持股增加了 6,800.0%。Archer Investment Corp 現在擁有 6,900 股該商業服務提供商的股票，價值 79,000 美元，此前在該期間又購買了 6,800 股。最後，Mirador Capital Partners LP 在第一季度收購了 Marathon Digital 的新股份，價值約 117,000 美元。目前 44.53% 的股票由機構投資者和對沖基金持有。</p>
<h2>華爾街分析師觀點</h2>
<p>幾位股票分析師最近對 MARA 股票發佈了報告。麥格理將 Marathon Digital 的目標價從 19.00 美元上調至 26.00 美元，並在 7 月 30 日的研究報告中給予該股票 “跑贏大盤” 的評級。派珀·桑德勒將 Marathon Digital 的目標價從 23.00 美元上調至 26.00 美元，並在 7 月 21 日的研究報告中給予該股票 “增持” 的評級。Cantor Fitzgerald 將 Marathon Digital 的目標價從 34.00 美元上調至 39.00 美元，並在 7 月 28 日的研究報告中給予該股票 “增持” 的評級。Rosenblatt Securities 重申了對 Marathon Digital 的 “買入” 評級，並在 7 月 30 日的研究報告中設定了 20.00 美元的目標價。最後，巴克萊將 Marathon Digital 的目標價從 14.00 美元上調至 16.00 美元，並在 5 月 12 日的研究報告中給予該股票 “持平” 的評級。六位投資分析師對該股票給予了 “買入” 評級，四位分析師對該股票給予了 “持有” 評級。根據 MarketBeat.com 的數據，該股票目前的共識評級為 “適度買入”，共識目標價為 24.22 美元。</p>
<ul>
<li>隨着比特幣創下新高，這三隻股票可能會爆炸式增長</li>
</ul>
<p><strong>查看我們關於 MARA 的最新股票報告</strong></p>
<h2>Marathon Digital 上漲 0.1%</h2>
<p>NASDAQ:MARA 週五開盤價為 15.98 美元。Marathon Digital Holdings, Inc.的 52 周低點為 9.81 美元，52 周高點為 30.28 美元。該公司的債務與股本比率為 0.47，流動比率為 0.54，速動比率為 0.54。該股票的市值為 59.2 億美元，市盈率為 14.40，貝塔值為 6.24。該公司的 50 日簡單移動平均線為 16.69 美元，200 日簡單移動平均線為 14.99 美元。</p>
<ul>
<li>為什麼現在可能是購買加密股票的最佳時機</li>
</ul>
<p>Marathon Digital（NASDAQ:MARA - 獲取免費報告）最近於 7 月 29 日發佈了季度財報。該商業服務提供商報告本季度每股收益為 1.84 美元，超出市場共識預期的（0.29 美元）2.13 美元。Marathon Digital 的股本回報率為負 2.11%，淨利潤率為 85.02%。該公司本季度的收入為 2.385 億美元，而分析師預期為 2.1225 億美元。在去年同期，該公司每股收益為（0.72 美元）。Marathon Digital 本季度的收入同比增長 64.0%。賣方分析師預計 Marathon Digital Holdings, Inc.在當前財年將發佈每股收益-1.04 美元。</p>
<h2>Marathon Digital 內部活動</h2>
<p>在 Marathon Digital 的其他新聞中，首席執行官 Frederick G. Thiel 在 8 月 18 日星期一出售了 27,505 股該公司的股票，交易價格為每股 15.28 美元，總價值為 420,276.40 美元。出售後，首席執行官在公司中持有 3,810,799 股，價值約 58,229,008.72 美元。該交易使其持股減少了 0.72%。該交易已在 SEC 的法律文件中披露，您可以通過此鏈接訪問。此外，首席財務官 Salman Hassan Khan 在 8 月 15 日星期五出售了 34,732 股該公司的股票，交易價格為每股 15.73 美元，總價值為 546,334.36 美元。出售完成後，首席財務官在公司中持有 353,160 股，價值 5,555,206.80 美元。該交易使其持股減少了 8.95%。該交易的披露可以在這裏找到。在過去 90 天內，內部人士共出售了 189,712 股公司股票，價值 3,186,128 美元。公司內部人士持有公司股票的 0.80%。</p>
<h2>Marathon Digital 簡介</h2>
<p>（免費報告）</p>
<p>MARA Holdings, Inc 是一家數字資產技術公司，專注於在美國的比特幣生態系統中挖掘數字資產。該公司曾名為 Marathon Digital Holdings, Inc，並於 2024 年 8 月更名為 MARA Holdings, Inc。MARA Holdings, Inc 成立於 2010 年，總部位於佛羅里達州勞德代爾堡。</p>
<h2>進一步閲讀</h2>
<ul>
<li>我們更看好的五隻股票，勝過 Marathon Digital</li>
<li>為什麼這些公司被認為是藍籌股？</li>
<li>改善的基本面推動三隻強勁表現者的新回購</li>
<li>三隻超市股票證明它們仍然是必需品</li>
<li>Gartner 可能是第三季度最佳購買的三大理由</li>
<li>什麼是股息收割策略，投資者如何從中獲利？</li>
<li>自由現金流的激增使微軟領先於同行</li>
</ul>
<p><strong>想看看其他對 MARA 感興趣的對沖基金持有哪些股票嗎？</strong> 訪問 HoldingsChannel.com 獲取 Marathon Digital Holdings, Inc. (NASDAQ:MARA - 免費報告) 的最新 13F 文件和內部交易信息。</p>
<p><img src="https://imageproxy.pbkrs.com/https://www.marketbeat.com/scripts/SECFilingChart.ashx/query-UHJlZml4PU5BU0RBUSZTeW1ib2w9TUFSQQ?x-oss-process=image/auto-orient,1/interlace,1/resize,w_1440,h_1440/quality,q_95/format,jpg" alt="" original-src="https://imageproxy.pbkrs.com/https://www.marketbeat.com/scripts/SECFilingChart.ashx/query-UHJlZml4PU5BU0RBUSZTeW1ib2w9TUFSQQ"/></p>
<p><em>此即時新聞提醒由敍述科學技術和 MarketBeat 的金融數據生成，以便為讀者提供最快和最準確的報道。此故事在發佈前已由 MarketBeat 的編輯團隊審核。請將任何問題或意見發送至 contact@marketbeat.com.</em></p>
<h2>你現在應該投資 $1,000 在 Marathon Digital 嗎？</h2>
<p>在考慮 Marathon Digital 之前，你需要聽聽這個。</p>
<p>MarketBeat 每天跟蹤華爾街頂級評級和表現最佳的研究分析師及其推薦給客户的股票。MarketBeat 已識別出五隻頂級分析師悄悄向客户推薦的股票，建議在更廣泛的市場注意到之前購買……而 Marathon Digital 並不在名單上。</p>
<p>雖然 Marathon Digital 目前在分析師中獲得了中等買入評級，但頂級分析師認為這五隻股票更值得購買。</p>
<p>在這裏查看這五隻股票</p>

MARA

<p>拉塞爾投資集團有限公司在第一季度將其在 Marathon Digital Holdings, Inc.（納斯達克代碼：MARA）的持股比例減少了 95.6%，目前持有 71,008 股，價值 81.7 萬美元。其他機構投資者也調整了他們的持倉。分析師們提高了對 MARA 的目標價格，普遍評級為 “適度買入”，目標價格為 24.22 美元。Marathon Digital 報告了強勁的季度收益，每股收益為 1.84 美元，營收為 2.385 億美元，同比增長 64%。首席執行官弗雷德裏克·G·蒂爾出售了價值 420,276 美元的股份，仍持有 381 萬股</p>

<p>Russell Investments Group Ltd. trimmed its position in Marathon Digital Holdings, Inc. (NASDAQ:MARA - Free Report) by 95.6% in the first quarter, according to the company in its most recent Form 13F filing with the Securities &amp; Exchange Commission. The firm owned 71,008 shares of the business services provider's stock after selling 1,547,823 shares during the quarter. Russell Investments Group Ltd.'s holdings in Marathon Digital were worth $817,000 as of its most recent SEC filing.</p>
<div class="lb-trans"><p>拉塞爾投資集團有限公司在最近向證券交易委員會提交的 13F 表格中披露，第一季度將其在 Marathon Digital Holdings, Inc.（NASDAQ:MARA - 免費報告）的持股減少了 95.6%。該公司在季度內出售了 1,547,823 股後，持有 71,008 股該商業服務提供商的股票。根據其最近的 SEC 文件，拉塞爾投資集團有限公司在 Marathon Digital 的持股價值為 817,000 美元。</p>
</div><p>Get <strong>Marathon Digital</strong> alerts:</p>
<div class="lb-trans"><p>獲取 <strong>Marathon Digital</strong> 警報：</p>
</div><ul>
<li>Crypto Skeptics Can Still Win Big With These Risk-Limiting ETFs</li>
</ul>
<div class="lb-trans"><ul>
<li>加密懷疑論者仍然可以通過這些風險限制 ETF 獲得豐厚收益</li>
</ul>
</div><p>A number of other hedge funds and other institutional investors have also recently added to or reduced their stakes in MARA. Park Square Financial Group LLC acquired a new stake in Marathon Digital in the fourth quarter worth about $27,000. CX Institutional acquired a new position in shares of Marathon Digital during the 1st quarter worth about $68,000. NewEdge Advisors LLC grew its position in shares of Marathon Digital by 28.9% during the 4th quarter. NewEdge Advisors LLC now owns 4,640 shares of the business services provider's stock worth $78,000 after buying an additional 1,040 shares during the period. Archer Investment Corp grew its position in shares of Marathon Digital by 6,800.0% during the 1st quarter. Archer Investment Corp now owns 6,900 shares of the business services provider's stock worth $79,000 after buying an additional 6,800 shares during the period. Finally, Mirador Capital Partners LP acquired a new position in shares of Marathon Digital during the 1st quarter worth about $117,000. 44.53% of the stock is currently owned by institutional investors and hedge funds.</p>
<div class="lb-trans"><p>其他一些對沖基金和機構投資者最近也增加或減少了在 MARA 的持股。Park Square Financial Group LLC 在第四季度收購了 Marathon Digital 的新股份，價值約 27,000 美元。CX Institutional 在第一季度收購了 Marathon Digital 的股份，價值約 68,000 美元。NewEdge Advisors LLC 在第四季度將其在 Marathon Digital 的持股增加了 28.9%。NewEdge Advisors LLC 現在擁有 4,640 股該商業服務提供商的股票，價值 78,000 美元，此前在該期間又購買了 1,040 股。Archer Investment Corp 在第一季度將其在 Marathon Digital 的持股增加了 6,800.0%。Archer Investment Corp 現在擁有 6,900 股該商業服務提供商的股票，價值 79,000 美元，此前在該期間又購買了 6,800 股。最後，Mirador Capital Partners LP 在第一季度收購了 Marathon Digital 的新股份，價值約 117,000 美元。目前 44.53% 的股票由機構投資者和對沖基金持有。</p>
</div><h2>Wall Street Analyst Weigh In</h2>
<div class="lb-trans"><h2>華爾街分析師觀點</h2>
</div><p>Several equities analysts have recently issued reports on MARA shares. Macquarie boosted their target price on Marathon Digital from $19.00 to $26.00 and gave the stock an &#34;outperform&#34; rating in a research report on Wednesday, July 30th. Piper Sandler boosted their target price on Marathon Digital from $23.00 to $26.00 and gave the stock an &#34;overweight&#34; rating in a research report on Monday, July 21st. Cantor Fitzgerald boosted their target price on Marathon Digital from $34.00 to $39.00 and gave the stock an &#34;overweight&#34; rating in a research report on Monday, July 28th. Rosenblatt Securities restated a &#34;buy&#34; rating and set a $20.00 target price on shares of Marathon Digital in a research report on Wednesday, July 30th. Finally, Barclays boosted their target price on Marathon Digital from $14.00 to $16.00 and gave the stock an &#34;equal weight&#34; rating in a research report on Monday, May 12th. Six investment analysts have rated the stock with a Buy rating and four have issued a Hold rating to the stock. Based on data from MarketBeat.com, the stock currently has a consensus rating of &#34;Moderate Buy&#34; and a consensus price target of $24.22.</p>
<div class="lb-trans"><p>幾位股票分析師最近對 MARA 股票發佈了報告。麥格理將 Marathon Digital 的目標價從 19.00 美元上調至 26.00 美元，並在 7 月 30 日的研究報告中給予該股票 “跑贏大盤” 的評級。派珀·桑德勒將 Marathon Digital 的目標價從 23.00 美元上調至 26.00 美元，並在 7 月 21 日的研究報告中給予該股票 “增持” 的評級。Cantor Fitzgerald 將 Marathon Digital 的目標價從 34.00 美元上調至 39.00 美元，並在 7 月 28 日的研究報告中給予該股票 “增持” 的評級。Rosenblatt Securities 重申了對 Marathon Digital 的 “買入” 評級，並在 7 月 30 日的研究報告中設定了 20.00 美元的目標價。最後，巴克萊將 Marathon Digital 的目標價從 14.00 美元上調至 16.00 美元，並在 5 月 12 日的研究報告中給予該股票 “持平” 的評級。六位投資分析師對該股票給予了 “買入” 評級，四位分析師對該股票給予了 “持有” 評級。根據 MarketBeat.com 的數據，該股票目前的共識評級為 “適度買入”，共識目標價為 24.22 美元。</p>
</div><ul>
<li>As Bitcoin Hits New Highs, These 3 Stocks Could Explode</li>
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<div class="lb-trans"><ul>
<li>隨着比特幣創下新高，這三隻股票可能會爆炸式增長</li>
</ul>
</div><p><strong>Check Out Our Latest Stock Report on MARA</strong></p>
<div class="lb-trans"><p><strong>查看我們關於 MARA 的最新股票報告</strong></p>
</div><h2>Marathon Digital Trading Up 0.1%</h2>
<div class="lb-trans"><h2>Marathon Digital 上漲 0.1%</h2>
</div><p>NASDAQ:MARA opened at $15.98 on Friday. Marathon Digital Holdings, Inc. has a fifty-two week low of $9.81 and a fifty-two week high of $30.28. The company has a debt-to-equity ratio of 0.47, a current ratio of 0.54 and a quick ratio of 0.54. The stock has a market capitalization of $5.92 billion, a PE ratio of 14.40 and a beta of 6.24. The business's 50-day simple moving average is $16.69 and its 200-day simple moving average is $14.99.</p>
<div class="lb-trans"><p>NASDAQ:MARA 週五開盤價為 15.98 美元。Marathon Digital Holdings, Inc.的 52 周低點為 9.81 美元，52 周高點為 30.28 美元。該公司的債務與股本比率為 0.47，流動比率為 0.54，速動比率為 0.54。該股票的市值為 59.2 億美元，市盈率為 14.40，貝塔值為 6.24。該公司的 50 日簡單移動平均線為 16.69 美元，200 日簡單移動平均線為 14.99 美元。</p>
</div><ul>
<li>Why Now Could Be the Smartest Time to Buy Crypto Stocks</li>
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<div class="lb-trans"><ul>
<li>為什麼現在可能是購買加密股票的最佳時機</li>
</ul>
</div><p>Marathon Digital (NASDAQ:MARA - Get Free Report) last released its quarterly earnings data on Tuesday, July 29th. The business services provider reported $1.84 earnings per share for the quarter, beating the consensus estimate of ($0.29) by $2.13. Marathon Digital had a negative return on equity of 2.11% and a net margin of 85.02%.The business had revenue of $238.50 million for the quarter, compared to analysts' expectations of $212.25 million. During the same quarter in the previous year, the business posted ($0.72) EPS. Marathon Digital's revenue for the quarter was up 64.0% on a year-over-year basis. Sell-side analysts expect that Marathon Digital Holdings, Inc. will post -1.04 earnings per share for the current fiscal year.</p>
<div class="lb-trans"><p>Marathon Digital（NASDAQ:MARA - 獲取免費報告）最近於 7 月 29 日發佈了季度財報。該商業服務提供商報告本季度每股收益為 1.84 美元，超出市場共識預期的（0.29 美元）2.13 美元。Marathon Digital 的股本回報率為負 2.11%，淨利潤率為 85.02%。該公司本季度的收入為 2.385 億美元，而分析師預期為 2.1225 億美元。在去年同期，該公司每股收益為（0.72 美元）。Marathon Digital 本季度的收入同比增長 64.0%。賣方分析師預計 Marathon Digital Holdings, Inc.在當前財年將發佈每股收益-1.04 美元。</p>
</div><h2>Insider Activity at Marathon Digital</h2>
<div class="lb-trans"><h2>Marathon Digital 內部活動</h2>
</div><p>In other Marathon Digital news, CEO Frederick G. Thiel sold 27,505 shares of the business's stock in a transaction that occurred on Monday, August 18th. The stock was sold at an average price of $15.28, for a total value of $420,276.40. Following the sale, the chief executive officer owned 3,810,799 shares in the company, valued at approximately $58,229,008.72. The trade was a 0.72% decrease in their position. The transaction was disclosed in a legal filing with the SEC, which is accessible through this link. Also, CFO Salman Hassan Khan sold 34,732 shares of the business's stock in a transaction that occurred on Friday, August 15th. The shares were sold at an average price of $15.73, for a total value of $546,334.36. Following the completion of the sale, the chief financial officer owned 353,160 shares in the company, valued at $5,555,206.80. The trade was a 8.95% decrease in their position. The disclosure for this sale can be found here. Insiders sold a total of 189,712 shares of company stock worth $3,186,128 in the last 90 days. Company insiders own 0.80% of the company's stock.</p>
<div class="lb-trans"><p>在 Marathon Digital 的其他新聞中，首席執行官 Frederick G. Thiel 在 8 月 18 日星期一出售了 27,505 股該公司的股票，交易價格為每股 15.28 美元，總價值為 420,276.40 美元。出售後，首席執行官在公司中持有 3,810,799 股，價值約 58,229,008.72 美元。該交易使其持股減少了 0.72%。該交易已在 SEC 的法律文件中披露，您可以通過此鏈接訪問。此外，首席財務官 Salman Hassan Khan 在 8 月 15 日星期五出售了 34,732 股該公司的股票，交易價格為每股 15.73 美元，總價值為 546,334.36 美元。出售完成後，首席財務官在公司中持有 353,160 股，價值 5,555,206.80 美元。該交易使其持股減少了 8.95%。該交易的披露可以在這裏找到。在過去 90 天內，內部人士共出售了 189,712 股公司股票，價值 3,186,128 美元。公司內部人士持有公司股票的 0.80%。</p>
</div><h2>Marathon Digital Profile</h2>
<div class="lb-trans"><h2>Marathon Digital 簡介</h2>
</div><p>(Free Report)</p>
<div class="lb-trans"><p>（免費報告）</p>
</div><p>MARA Holdings, Inc operates as a digital asset technology company that mines digital assets with a focus on the bitcoin ecosystem in United States. The company was formerly known as Marathon Digital Holdings, Inc and changed its name to MARA Holdings, Inc in August 2024. MARA Holdings, Inc was incorporated in 2010 and is headquartered in Fort Lauderdale, Florida.</p>
<div class="lb-trans"><p>MARA Holdings, Inc 是一家數字資產技術公司，專注於在美國的比特幣生態系統中挖掘數字資產。該公司曾名為 Marathon Digital Holdings, Inc，並於 2024 年 8 月更名為 MARA Holdings, Inc。MARA Holdings, Inc 成立於 2010 年，總部位於佛羅里達州勞德代爾堡。</p>
</div><h2>Further Reading</h2>
<div class="lb-trans"><h2>進一步閲讀</h2>
</div><ul>
<li>Five stocks we like better than Marathon Digital</li>
<li>Why Are These Companies Considered Blue Chips?</li>
<li>Improving Fundamentals Drive New Buybacks for 3 Strong Performers</li>
<li>3 Grocery Stocks That Are Proving They Are Still Essential</li>
<li>3 Reasons Gartner Could Be the Best Buy of Q3</li>
<li>What is a Dividend Harvesting Strategy and How Can Investors Profit from it?</li>
<li>Free Cash Flow Boom Keeps Microsoft Ahead of the Pack</li>
</ul>
<div class="lb-trans"><ul>
<li>我們更看好的五隻股票，勝過 Marathon Digital</li>
<li>為什麼這些公司被認為是藍籌股？</li>
<li>改善的基本面推動三隻強勁表現者的新回購</li>
<li>三隻超市股票證明它們仍然是必需品</li>
<li>Gartner 可能是第三季度最佳購買的三大理由</li>
<li>什麼是股息收割策略，投資者如何從中獲利？</li>
<li>自由現金流的激增使微軟領先於同行</li>
</ul>
</div><p><strong>Want to see what other hedge funds are holding MARA?</strong> Visit HoldingsChannel.com to get the latest 13F filings and insider trades for Marathon Digital Holdings, Inc. (NASDAQ:MARA - Free Report).</p>
<div class="lb-trans"><p><strong>想看看其他對 MARA 感興趣的對沖基金持有哪些股票嗎？</strong> 訪問 HoldingsChannel.com 獲取 Marathon Digital Holdings, Inc. (NASDAQ:MARA - 免費報告) 的最新 13F 文件和內部交易信息。</p>
</div><p><img src="https://imageproxy.pbkrs.com/https://www.marketbeat.com/scripts/SECFilingChart.ashx/query-UHJlZml4PU5BU0RBUSZTeW1ib2w9TUFSQQ" alt="" original-src="https://www.marketbeat.com/scripts/SECFilingChart.ashx?Prefix=NASDAQ&amp;Symbol=MARA"/></p>
<p><em>This instant news alert was generated by narrative science technology and financial data from MarketBeat in order to provide readers with the fastest and most accurate reporting. This story was reviewed by MarketBeat's editorial team prior to publication. Please send any questions or comments about this story to contact@marketbeat.com.</em></p>
<div class="lb-trans"><p><em>此即時新聞提醒由敍述科學技術和 MarketBeat 的金融數據生成，以便為讀者提供最快和最準確的報道。此故事在發佈前已由 MarketBeat 的編輯團隊審核。請將任何問題或意見發送至 contact@marketbeat.com.</em></p>
</div><h2>Should You Invest $1,000 in Marathon Digital Right Now?</h2>
<div class="lb-trans"><h2>你現在應該投資 $1,000 在 Marathon Digital 嗎？</h2>
</div><p>Before you consider Marathon Digital, you'll want to hear this.</p>
<div class="lb-trans"><p>在考慮 Marathon Digital 之前，你需要聽聽這個。</p>
</div><p>MarketBeat keeps track of Wall Street's top-rated and best performing research analysts and the stocks they recommend to their clients on a daily basis. MarketBeat has identified the five stocks that top analysts are quietly whispering to their clients to buy now before the broader market catches on... and Marathon Digital wasn't on the list.</p>
<div class="lb-trans"><p>MarketBeat 每天跟蹤華爾街頂級評級和表現最佳的研究分析師及其推薦給客户的股票。MarketBeat 已識別出五隻頂級分析師悄悄向客户推薦的股票，建議在更廣泛的市場注意到之前購買……而 Marathon Digital 並不在名單上。</p>
</div><p>While Marathon Digital currently has a Moderate Buy rating among analysts, top-rated analysts believe these five stocks are better buys.</p>
<div class="lb-trans"><p>雖然 Marathon Digital 目前在分析師中獲得了中等買入評級，但頂級分析師認為這五隻股票更值得購買。</p>
</div><p>View The Five Stocks Here</p>
<div class="lb-trans"><p>在這裏查看這五隻股票</p>
</div>

Russell Investments Group Ltd. 在 Marathon Digital Holdings, Inc. (MARA) 擁有價值 817,000 美元的股票頭寸