<p>隨着美國股市不斷創下新高，納斯達克和標準普爾 500 指數紛紛刷新紀錄，投資者密切關注那些因內部持股強勁而受到支持的成長股。在這種強勁的市場環境中，內部人士持有顯著股份的公司尤其吸引人，因為這通常表明對公司潛力的信心，並將管理層的利益與股東的利益對齊。</p>
<h3>美國內部持股比例高的十大成長公司</h3>
<table>
<thead>
<tr>
<th></th>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td><strong>名稱</strong></td>
<td><strong>內部持股</strong></td>
<td><strong>收益增長</strong></td>
</tr>
<tr>
<td>Upstart Holdings (UPST)</td>
<td>12.6%</td>
<td>93.2%</td>
</tr>
<tr>
<td>Niu Technologies (NIU)</td>
<td>37.2%</td>
<td>92.8%</td>
</tr>
<tr>
<td>IREN (IREN)</td>
<td>11.2%</td>
<td>59.3%</td>
</tr>
<tr>
<td>Hippo Holdings (HIPO)</td>
<td>14.1%</td>
<td>41.2%</td>
</tr>
<tr>
<td>Hesai Group (HSAI)</td>
<td>15.7%</td>
<td>41.5%</td>
</tr>
<tr>
<td>FTC Solar (FTCI)</td>
<td>23.1%</td>
<td>63%</td>
</tr>
<tr>
<td>Credo Technology Group Holding (CRDO)</td>
<td>11.4%</td>
<td>33%</td>
</tr>
<tr>
<td>Cloudflare (NET)</td>
<td>10.5%</td>
<td>46.1%</td>
</tr>
<tr>
<td>Atour Lifestyle Holdings (ATAT)</td>
<td>21.8%</td>
<td>23.5%</td>
</tr>
<tr>
<td>Astera Labs (ALAB)</td>
<td>12.1%</td>
<td>36.8%</td>
</tr>
</tbody>
</table>
<p>點擊這裏查看我們關於內部持股比例高的 198 只快速成長美國公司的完整名單。</p>
<p>讓我們深入探討一些篩選出的優質選擇。</p>
<h2>Aeluma (ALMU)</h2>
<p><strong>Simply Wall St 成長評級：</strong> ★★★★★☆</p>
<p><strong>概述：</strong> Aeluma, Inc. 在美國開發光電和電子設備，市值為 2.7097 億美元。</p>
<p><strong>運營：</strong> 公司的收入主要來自其半導體設備和服務部門，總計 467 萬美元。</p>
<p><strong>內部持股：</strong> 36.8%</p>
<p><strong>收入增長預測：</strong> 每年 59.3%。</p>
<p>Aeluma, Inc. 展現出顯著的增長潛力，預計年收入增長 59.3%，超過美國市場的平均水平。儘管由於 2210 萬美元的後續股權發行導致近期股東稀釋，但其被納入多個羅素指數，突顯了其在成長領域的認可。該公司報告了 2025 財年的顯著銷售增長，並與去年相比減少了淨虧損，符合三年內實現盈利的預期。</p>
<ul>
<li>在我們的收益增長報告中更深入地瞭解 Aeluma 的潛力。</li>
<li>根據我們最近的估值報告，Aeluma 的交易價格似乎超出了其估計價值。</li>
</ul>
<p><img src="https://imageproxy.pbkrs.com/https://images.simplywall.st/company/8e8282ca-5b23-4cd2-ad0a-3a9889736660/chart/earnings-and-revenue-growth?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://images.simplywall.st/company/8e8282ca-5b23-4cd2-ad0a-3a9889736660/chart/earnings-and-revenue-growth"/></p>
<p>截至 2025 年 9 月的 ALMU 收益和收入增長</p>
<h2>Dave (DAVE)</h2>
<p><strong>Simply Wall St 成長評級：</strong> ★★★★☆☆</p>
<p><strong>概述：</strong> Dave Inc. 在美國運營一個金融服務平台，提供各種金融產品和服務，市值約為 29.5 億美元。</p>
<p><strong>運營：</strong> 公司的收入主要來自其基於服務和交易的運營，總計 4.3307 億美元。</p>
<p><strong>內部持股：</strong> 20%</p>
<p><strong>收入增長預測：</strong> 每年 15.8%。</p>
<p>Dave Inc. 展現出良好的增長潛力，預計收益年增長率為 40.5%，超過美國市場平均水平。其 CashAI 技術的最新進展增強了承保能力和信用表現，支持收入擴張。儘管股價波動和近期內部人士出售股票，但公司宣佈了一項 1.25 億美元的股票回購計劃，並將 2025 年的收入指引提高至 5.05 億至 5.15 億美元，反映出對未來增長前景的信心。</p>
<ul>
<li>通過閲讀我們的分析師估計報告，深入瞭解 Dave 的表現。</li>
<li>我們的估值報告揭示了 Dave 的股票可能以溢價交易的可能性。</li>
</ul>
<p><img src="https://imageproxy.pbkrs.com/https://images.simplywall.st/company/9f1fec0b-d06f-43ef-bc01-3a6504b4f97b/chart/ownership-breakdown?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://images.simplywall.st/company/9f1fec0b-d06f-43ef-bc01-3a6504b4f97b/chart/ownership-breakdown"/></p>
<p>截至 2025 年 9 月的 DAVE 持股結構</p>
<h2>LifeMD (LFMD)</h2>
<p><strong>Simply Wall St 成長評級：</strong> ★★★★☆☆</p>
<p><strong>概述：</strong> LifeMD, Inc. 是一家直接面向患者的遠程醫療公司，連接消費者與醫療專業人士，市值為 2.883 億美金。</p>
<p><strong>運營：</strong> 公司的收入來自兩個主要部門：遠程醫療，產生 1.9119 億美元，以及 Worksimpli，貢獻 5438 萬美元。</p>
<p><strong>內部持股：</strong> 15%</p>
<p><strong>收入增長預測：</strong> 每年 14.6%。</p>
<p>LifeMD 正在經歷增長，預計收益年增長率為 110.47%，超越市場。儘管近期面臨法律挑戰和會計公司變更，但公司報告 2025 年第二季度收入為 6222 萬美元，較去年有顯著改善。內部活動顯示近期購買多於出售，表明對未來前景的信心。然而，2025 年的指引下調反映出由於 RexMD 部門和體重管理項目運營成本上升而持謹慎態度。</p>
<ul>
<li>在這裏深入瞭解 LifeMD 的完整分析和未來增長報告。</li>
<li>根據我們的估值報告，LifeMD 的股價可能偏低。</li>
</ul>
<p><img src="https://imageproxy.pbkrs.com/https://images.simplywall.st/company/feefdf8c-475e-4a0b-9631-aa0d54962629/chart/earnings-and-revenue-growth?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://images.simplywall.st/company/feefdf8c-475e-4a0b-9631-aa0d54962629/chart/earnings-and-revenue-growth"/></p>
<p>截至 2025 年 9 月的 LFMD 收益和收入增長</p>
<h2>抓住機會</h2>
<ul>
<li>點擊這裏訪問我們關於內部持股比例高的 198 家快速成長美國公司的完整索引。</li>
<li>對其他選擇感興趣？尋找現金流潛力良好但交易價格低於公允價值的公司。</li>
</ul>
<p><em>這篇來自 Simply Wall St 的文章具有一般性。<strong>我們提供的評論基於歷史數據和分析師預測，僅使用無偏見的方法，我們的文章並不意圖提供財務建議。</strong> 這並不構成買賣任何股票的推薦，也未考慮您的目標或財務狀況。我們的目標是為您提供以基本數據驅動的長期分析。請注意，我們的分析可能未考慮最新的價格敏感公司公告或定性材料。Simply Wall St 在提到的任何股票中沒有持倉。該分析僅考慮內部人士直接持有的股票，不包括通過其他工具如公司和/或信託實體間接持有的股票。所有預測的收入和收益增長率均以年化（每年）增長率的形式表示，時間範圍為 1-3 年。</em></p>

DAVE

小牛電動

ALMU

LFMD

UPST

<p>隨着美國股市達到新高，投資者開始關注內部持股比例高的成長股，這通常表明對公司潛力的信心。內部持股比例高的前 10 家成長公司包括 Upstart Holdings、小牛電動和 Aeluma，預計年收入增長率為 59.3%。其他一些值得注意的公司，如 Dave Inc.和 LifeMD，儘管面臨近期挑戰，仍顯示出良好的增長潛力。分析強調了內部持股在評估成長股時的重要性</p>

<p>As the U.S. stock market continues to reach new heights, with the Nasdaq and S&amp;P 500 setting fresh records, investors are keenly observing growth stocks that have been bolstered by strong insider ownership. In this robust market environment, companies where insiders hold significant stakes can be particularly appealing as they often signal confidence in the company's potential and align management's interests with those of shareholders.</p>
<div class="lb-trans"><p>隨着美國股市不斷創下新高，納斯達克和標準普爾 500 指數紛紛刷新紀錄，投資者密切關注那些因內部持股強勁而受到支持的成長股。在這種強勁的市場環境中，內部人士持有顯著股份的公司尤其吸引人，因為這通常表明對公司潛力的信心，並將管理層的利益與股東的利益對齊。</p>
</div><h3>Top 10 Growth Companies With High Insider Ownership In The United States</h3>
<div class="lb-trans"><h3>美國內部持股比例高的十大成長公司</h3>
</div><table>
<thead>
<tr>
<th></th>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td><strong>Name</strong></td>
<td><strong>Insider Ownership</strong></td>
<td><strong>Earnings Growth</strong></td>
</tr>
<tr>
<td>Upstart Holdings (UPST)</td>
<td>12.6%</td>
<td>93.2%</td>
</tr>
<tr>
<td>Niu Technologies (NIU)</td>
<td>37.2%</td>
<td>92.8%</td>
</tr>
<tr>
<td>IREN (IREN)</td>
<td>11.2%</td>
<td>59.3%</td>
</tr>
<tr>
<td>Hippo Holdings (HIPO)</td>
<td>14.1%</td>
<td>41.2%</td>
</tr>
<tr>
<td>Hesai Group (HSAI)</td>
<td>15.7%</td>
<td>41.5%</td>
</tr>
<tr>
<td>FTC Solar (FTCI)</td>
<td>23.1%</td>
<td>63%</td>
</tr>
<tr>
<td>Credo Technology Group Holding (CRDO)</td>
<td>11.4%</td>
<td>33%</td>
</tr>
<tr>
<td>Cloudflare (NET)</td>
<td>10.5%</td>
<td>46.1%</td>
</tr>
<tr>
<td>Atour Lifestyle Holdings (ATAT)</td>
<td>21.8%</td>
<td>23.5%</td>
</tr>
<tr>
<td>Astera Labs (ALAB)</td>
<td>12.1%</td>
<td>36.8%</td>
</tr>
</tbody>
</table>
<div class="lb-trans"><table>
<thead>
<tr>
<th></th>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td><strong>名稱</strong></td>
<td><strong>內部持股</strong></td>
<td><strong>收益增長</strong></td>
</tr>
<tr>
<td>Upstart Holdings (UPST)</td>
<td>12.6%</td>
<td>93.2%</td>
</tr>
<tr>
<td>Niu Technologies (NIU)</td>
<td>37.2%</td>
<td>92.8%</td>
</tr>
<tr>
<td>IREN (IREN)</td>
<td>11.2%</td>
<td>59.3%</td>
</tr>
<tr>
<td>Hippo Holdings (HIPO)</td>
<td>14.1%</td>
<td>41.2%</td>
</tr>
<tr>
<td>Hesai Group (HSAI)</td>
<td>15.7%</td>
<td>41.5%</td>
</tr>
<tr>
<td>FTC Solar (FTCI)</td>
<td>23.1%</td>
<td>63%</td>
</tr>
<tr>
<td>Credo Technology Group Holding (CRDO)</td>
<td>11.4%</td>
<td>33%</td>
</tr>
<tr>
<td>Cloudflare (NET)</td>
<td>10.5%</td>
<td>46.1%</td>
</tr>
<tr>
<td>Atour Lifestyle Holdings (ATAT)</td>
<td>21.8%</td>
<td>23.5%</td>
</tr>
<tr>
<td>Astera Labs (ALAB)</td>
<td>12.1%</td>
<td>36.8%</td>
</tr>
</tbody>
</table>
</div><p>Click here to see the full list of 198 stocks from our Fast Growing US Companies With High Insider Ownership screener.</p>
<div class="lb-trans"><p>點擊這裏查看我們關於內部持股比例高的 198 只快速成長美國公司的完整名單。</p>
</div><p>Let's dive into some prime choices out of the screener.</p>
<div class="lb-trans"><p>讓我們深入探討一些篩選出的優質選擇。</p>
</div><h2>Aeluma (ALMU)</h2>
<div class="lb-trans"><h2>Aeluma (ALMU)</h2>
</div><p><strong>Simply Wall St Growth Rating:</strong> ★★★★★☆</p>
<div class="lb-trans"><p><strong>Simply Wall St 成長評級：</strong> ★★★★★☆</p>
</div><p><strong>Overview:</strong> Aeluma, Inc. develops optoelectronic and electronic devices in the United States with a market cap of $270.97 million.</p>
<div class="lb-trans"><p><strong>概述：</strong> Aeluma, Inc. 在美國開發光電和電子設備，市值為 2.7097 億美元。</p>
</div><p><strong>Operations:</strong> The company's revenue is primarily derived from its Semiconductor Equipment and Services segment, totaling $4.67 million.</p>
<div class="lb-trans"><p><strong>運營：</strong> 公司的收入主要來自其半導體設備和服務部門，總計 467 萬美元。</p>
</div><p><strong>Insider Ownership:</strong> 36.8%</p>
<div class="lb-trans"><p><strong>內部持股：</strong> 36.8%</p>
</div><p><strong>Revenue Growth Forecast:</strong> 59.3% p.a.</p>
<div class="lb-trans"><p><strong>收入增長預測：</strong> 每年 59.3%。</p>
</div><p>Aeluma, Inc. has demonstrated significant growth potential with a forecasted revenue increase of 59.3% annually, outpacing the US market's average. Despite recent shareholder dilution due to a $22.1 million follow-on equity offering, its addition to numerous Russell indexes underscores its recognition in the growth sector. The company reported substantial sales growth for FY2025 and reduced net losses compared to the previous year, aligning with expectations of profitability within three years.</p>
<div class="lb-trans"><p>Aeluma, Inc. 展現出顯著的增長潛力，預計年收入增長 59.3%，超過美國市場的平均水平。儘管由於 2210 萬美元的後續股權發行導致近期股東稀釋，但其被納入多個羅素指數，突顯了其在成長領域的認可。該公司報告了 2025 財年的顯著銷售增長，並與去年相比減少了淨虧損，符合三年內實現盈利的預期。</p>
</div><ul>
<li>Take a closer look at Aeluma's potential here in our earnings growth report.</li>
<li>In light of our recent valuation report, it seems possible that Aeluma is trading beyond its estimated value.</li>
</ul>
<div class="lb-trans"><ul>
<li>在我們的收益增長報告中更深入地瞭解 Aeluma 的潛力。</li>
<li>根據我們最近的估值報告，Aeluma 的交易價格似乎超出了其估計價值。</li>
</ul>
</div><p><img src="https://imageproxy.pbkrs.com/https://images.simplywall.st/company/8e8282ca-5b23-4cd2-ad0a-3a9889736660/chart/earnings-and-revenue-growth" alt="" original-src="https://images.simplywall.st/company/8e8282ca-5b23-4cd2-ad0a-3a9889736660/chart/earnings-and-revenue-growth"/></p>
<p>ALMU Earnings and Revenue Growth as at Sep 2025</p>
<div class="lb-trans"><p>截至 2025 年 9 月的 ALMU 收益和收入增長</p>
</div><h2>Dave (DAVE)</h2>
<div class="lb-trans"><h2>Dave (DAVE)</h2>
</div><p><strong>Simply Wall St Growth Rating:</strong> ★★★★☆☆</p>
<div class="lb-trans"><p><strong>Simply Wall St 成長評級：</strong> ★★★★☆☆</p>
</div><p><strong>Overview:</strong> Dave Inc. operates a financial services platform offering various financial products and services in the United States, with a market capitalization of approximately $2.95 billion.</p>
<div class="lb-trans"><p><strong>概述：</strong> Dave Inc. 在美國運營一個金融服務平台，提供各種金融產品和服務，市值約為 29.5 億美元。</p>
</div><p><strong>Operations:</strong> The company's revenue is primarily generated from its service-based and transaction-based operations, totaling $433.07 million.</p>
<div class="lb-trans"><p><strong>運營：</strong> 公司的收入主要來自其基於服務和交易的運營，總計 4.3307 億美元。</p>
</div><p><strong>Insider Ownership:</strong> 20%</p>
<div class="lb-trans"><p><strong>內部持股：</strong> 20%</p>
</div><p><strong>Revenue Growth Forecast:</strong> 15.8% p.a.</p>
<div class="lb-trans"><p><strong>收入增長預測：</strong> 每年 15.8%。</p>
</div><p>Dave Inc. has shown promising growth potential, with earnings forecasted to grow at 40.5% annually, outpacing the US market average. Recent advancements in its CashAI technology enhance underwriting capabilities and credit performance, supporting revenue expansion. Despite a volatile share price and recent insider selling, the company announced a $125 million share repurchase program and raised its revenue guidance for 2025 to $505-515 million, reflecting confidence in future growth prospects.</p>
<div class="lb-trans"><p>Dave Inc. 展現出良好的增長潛力，預計收益年增長率為 40.5%，超過美國市場平均水平。其 CashAI 技術的最新進展增強了承保能力和信用表現，支持收入擴張。儘管股價波動和近期內部人士出售股票，但公司宣佈了一項 1.25 億美元的股票回購計劃，並將 2025 年的收入指引提高至 5.05 億至 5.15 億美元，反映出對未來增長前景的信心。</p>
</div><ul>
<li>Get an in-depth perspective on Dave's performance by reading our analyst estimates report here.</li>
<li>Our valuation report unveils the possibility Dave's shares may be trading at a premium.</li>
</ul>
<div class="lb-trans"><ul>
<li>通過閲讀我們的分析師估計報告，深入瞭解 Dave 的表現。</li>
<li>我們的估值報告揭示了 Dave 的股票可能以溢價交易的可能性。</li>
</ul>
</div><p><img src="https://imageproxy.pbkrs.com/https://images.simplywall.st/company/9f1fec0b-d06f-43ef-bc01-3a6504b4f97b/chart/ownership-breakdown" alt="" original-src="https://images.simplywall.st/company/9f1fec0b-d06f-43ef-bc01-3a6504b4f97b/chart/ownership-breakdown"/></p>
<p>DAVE Ownership Breakdown as at Sep 2025</p>
<div class="lb-trans"><p>截至 2025 年 9 月的 DAVE 持股結構</p>
</div><h2>LifeMD (LFMD)</h2>
<div class="lb-trans"><h2>LifeMD (LFMD)</h2>
</div><p><strong>Simply Wall St Growth Rating:</strong> ★★★★☆☆</p>
<div class="lb-trans"><p><strong>Simply Wall St 成長評級：</strong> ★★★★☆☆</p>
</div><p><strong>Overview:</strong> LifeMD, Inc. is a direct-to-patient telehealth company in the United States that connects consumers with healthcare professionals, with a market cap of $288.30 million.</p>
<div class="lb-trans"><p><strong>概述：</strong> LifeMD, Inc. 是一家直接面向患者的遠程醫療公司，連接消費者與醫療專業人士，市值為 2.883 億美金。</p>
</div><p><strong>Operations:</strong> The company's revenue is derived from two main segments: Telehealth, generating $191.19 million, and Worksimpli, contributing $54.38 million.</p>
<div class="lb-trans"><p><strong>運營：</strong> 公司的收入來自兩個主要部門：遠程醫療，產生 1.9119 億美元，以及 Worksimpli，貢獻 5438 萬美元。</p>
</div><p><strong>Insider Ownership:</strong> 15%</p>
<div class="lb-trans"><p><strong>內部持股：</strong> 15%</p>
</div><p><strong>Revenue Growth Forecast:</strong> 14.6% p.a.</p>
<div class="lb-trans"><p><strong>收入增長預測：</strong> 每年 14.6%。</p>
</div><p>LifeMD is experiencing growth with earnings projected to increase 110.47% annually, outperforming the market. Despite recent legal challenges and accounting firm changes, the company reported revenue of US$62.22 million for Q2 2025, a notable improvement from last year. Insider activity shows more purchases than sales recently, indicating confidence in its future prospects. However, lowered guidance for 2025 reflects caution due to rising costs in its RexMD segment and weight management program operations.</p>
<div class="lb-trans"><p>LifeMD 正在經歷增長，預計收益年增長率為 110.47%，超越市場。儘管近期面臨法律挑戰和會計公司變更，但公司報告 2025 年第二季度收入為 6222 萬美元，較去年有顯著改善。內部活動顯示近期購買多於出售，表明對未來前景的信心。然而，2025 年的指引下調反映出由於 RexMD 部門和體重管理項目運營成本上升而持謹慎態度。</p>
</div><ul>
<li>Delve into the full analysis future growth report here for a deeper understanding of LifeMD.</li>
<li>According our valuation report, there's an indication that LifeMD's share price might be on the cheaper side.</li>
</ul>
<div class="lb-trans"><ul>
<li>在這裏深入瞭解 LifeMD 的完整分析和未來增長報告。</li>
<li>根據我們的估值報告，LifeMD 的股價可能偏低。</li>
</ul>
</div><p><img src="https://imageproxy.pbkrs.com/https://images.simplywall.st/company/feefdf8c-475e-4a0b-9631-aa0d54962629/chart/earnings-and-revenue-growth" alt="" original-src="https://images.simplywall.st/company/feefdf8c-475e-4a0b-9631-aa0d54962629/chart/earnings-and-revenue-growth"/></p>
<p>LFMD Earnings and Revenue Growth as at Sep 2025</p>
<div class="lb-trans"><p>截至 2025 年 9 月的 LFMD 收益和收入增長</p>
</div><h2>Seize The Opportunity</h2>
<div class="lb-trans"><h2>抓住機會</h2>
</div><ul>
<li>Click here to access our complete index of 198 Fast Growing US Companies With High Insider Ownership.</li>
<li>Curious About Other Options? Find companies with promising cash flow potential yet trading below their fair value.</li>
</ul>
<div class="lb-trans"><ul>
<li>點擊這裏訪問我們關於內部持股比例高的 198 家快速成長美國公司的完整索引。</li>
<li>對其他選擇感興趣？尋找現金流潛力良好但交易價格低於公允價值的公司。</li>
</ul>
</div><p><em>This article by Simply Wall St is general in nature. <strong>We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice.</strong> It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.The analysis only considers stock directly held by insiders. It does not include indirectly owned stock through other vehicles such as corporate and/or trust entities. All forecast revenue and earnings growth rates quoted are in terms of annualised (per annum) growth rates over 1-3 years.</em></p>
<div class="lb-trans"><p><em>這篇來自 Simply Wall St 的文章具有一般性。<strong>我們提供的評論基於歷史數據和分析師預測，僅使用無偏見的方法，我們的文章並不意圖提供財務建議。</strong> 這並不構成買賣任何股票的推薦，也未考慮您的目標或財務狀況。我們的目標是為您提供以基本數據驅動的長期分析。請注意，我們的分析可能未考慮最新的價格敏感公司公告或定性材料。Simply Wall St 在提到的任何股票中沒有持倉。該分析僅考慮內部人士直接持有的股票，不包括通過其他工具如公司和/或信託實體間接持有的股票。所有預測的收入和收益增長率均以年化（每年）增長率的形式表示，時間範圍為 1-3 年。</em></p>
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2025 年 9 月的領先增長股，內部持股比例強勁