賣空交易最多可以借入多少股票，取決於股票的初始保證金率和閣下帳戶的資產情況。當帳戶內的現金不足但有足夠的購買力時，微牛將自動根據您的帳戶資產情況向您提供融資，以維持足夠的抵押金額。最多可賣出多少股票可在交易下單時看到，如下圖所示：
'%3e %3cg id='%e7%bc%96%e7%bb%84-7' transform='translate(0.000000%2c 229.000000)'%3e %3cg id='%e7%bc%96%e7%bb%84-3' transform='translate(80.533981%2c 22.000000)'%3e %3cpath d='M41.7832962%2c0 C41.9459106%2c0 42.0882746%2c0.0866854658 42.1666825%2c0.216359069 C43.8289923%2c2.66540836 44.7676281%2c5.46271319 44.7676281%2c8.43208061 C44.7676281%2c18.1345746 34.7460532%2c26 22.383814%2c26 C10.0215749%2c26 0%2c18.1345746 0%2c8.43208061 C0%2c5.46716016 0.935826425%2c2.67378733 2.58829888%2c0.223985685 C2.67109477%2c0.0916264068 2.81687473%2c0 2.9840593%2c0 C3.23130408%2c0 3.43173558%2c0.200393004 3.43173558%2c0.447590303 C3.43173558%2c0.475056669 3.42926112%2c0.501945205 3.42452292%2c0.528045226 L3.41810883%2c0.550292077 C3.37800671%2c0.861741908 3.3575721%2c1.17661276 3.3575721%2c1.49443092 C3.3575721%2c7.98336 11.2132389%2c12.5742305 22.383814%2c12.5742305 C33.5543891%2c12.5742305 41.410056%2c7.98336 41.410056%2c1.49443092 C41.410056%2c1.17865223 41.3898828%2c0.865783153 41.3502888%2c0.556288325 C41.3402868%2c0.521941442 41.3356199%2c0.48531078 41.3356199%2c0.447590303 C41.3356199%2c0.200393004 41.5360514%2c0 41.7832962%2c0 Z' id='logo%e5%a4%87%e4%bb%bd-6' fill='%23003EFC'%3e%3c/path%3e %3cpath d='M75.1559425%2c3.74404927 C75.7071421%2c3.74404927 76.2394493%2c3.66184338 76.7416414%2c3.50883715 L74.281987%2c20.8666902 C74.0430787%2c22.5662954 73.2732628%2c23.0518969 71.8929033%2c23.0518969 L70.459453%2c23.0518969 C69.2649111%2c23.0518969 68.6278221%2c22.458384 68.2561868%2c20.893668 L66.1591022%2c11.9909739 C66.1060114%2c11.7481731 66.1060114%2c11.6942174 65.9998299%2c11.6942174 C65.8936484%2c11.6942174 65.867103%2c11.7481731 65.8140123%2c11.9909739 L63.7169276%2c20.893668 C63.3452924%2c22.458384 62.7082033%2c23.0518969 61.5136614%2c23.0518969 L60.0802112%2c23.0518969 C58.6998516%2c23.0518969 57.9300358%2c22.5662954 57.6911274%2c20.8666902 L55.2123917%2c3.37406084 C55.8253692%2c3.61307396 56.491017%2c3.74404927 57.1867652%2c3.74404927 C57.7974457%2c3.74404927 58.3849364%2c3.64314414 58.9339751%2c3.4568446 L60.8234817%2c19.3829078 C60.8500271%2c19.6257086 60.8500271%2c19.7875757 60.9562086%2c19.7875757 C61.0623901%2c19.7875757 61.0623901%2c19.6257086 61.1154808%2c19.3829078 L63.3983831%2c9.91367858 C63.5576554%2c9.26620991 63.9292906%2c8.69967483 65.0707418%2c8.69967483 L66.9023727%2c8.69967483 C68.0438238%2c8.69967483 68.4154591%2c9.26620991 68.5747313%2c9.91367858 L70.8576336%2c19.3829078 C70.9107244%2c19.6257086 70.9107244%2c19.7875757 71.0169059%2c19.7875757 C71.1230874%2c19.7875757 71.1230874%2c19.6257086 71.1496327%2c19.3829078 L73.0551401%2c3.32292288 C73.7026096%2c3.59432921 74.4120718%2c3.74404927 75.1559425%2c3.74404927 Z' id='Combined-Shape' fill='black'%3e%3c/path%3e %3cpath d='M85.0594095%2c7.43171536 C89.1473973%2c7.43171536 91.3772089%2c10.2643908 91.3772089%2c14.2840921 L91.3772089%2c15.7948523 C91.3772089%2c16.2264981 91.2179366%2c16.4692988 90.8463013%2c16.4692988 L82.1925089%2c16.4692988 L82.1925089%2c16.5502324 C82.1925089%2c18.1149484 82.829598%2c19.9764208 85.377954%2c19.9764208 C87.3157664%2c19.9764208 89.1473973%2c19.8145536 90.2623031%2c19.7066422 L90.3419392%2c19.7066422 C90.607393%2c19.7066422 90.819756%2c19.8415315 90.819756%2c20.1113101 L90.819756%2c21.8918489 C90.819756%2c22.3234947 90.7401198%2c22.5123397 90.2623031%2c22.5932733 C88.5368537%2c22.9170076 87.501584%2c23.0518969 85.1125002%2c23.0518969 C82.4579627%2c23.0518969 78.6885194%2c21.5950924 78.6885194%2c16.2804538 L78.6885194%2c14.2840921 C78.6885194%2c10.0755457 80.997967%2c7.43171536 85.0594095%2c7.43171536 Z M85.0594095%2c10.5071915 C83.4135962%2c10.5071915 82.2190543%2c11.6942174 82.2190543%2c13.8254684 L82.2190543%2c13.9333799 L87.8466739%2c13.9333799 L87.8466739%2c13.8254684 C87.8466739%2c11.7211953 86.7052228%2c10.5071915 85.0594095%2c10.5071915 Z' id='Combined-Shape' fill='black'%3e%3c/path%3e %3cpath d='M97.88151%2c2.98826245 L97.8808258%2c7.62056039 C98.8630047%2c7.48567108 99.7920929%2c7.43171536 100.429182%2c7.43171536 C104.702987%2c7.43171536 106.773527%2c9.99461216 106.773527%2c14.2031585 L106.773527%2c16.2804538 C106.773527%2c20.4890001 104.702987%2c23.0518969 100.429182%2c23.0518969 C98.7302779%2c23.0518969 96.7393747%2c22.7821183 95.0935614%2c22.3504725 C94.4830178%2c22.1886054 94.3768363%2c22.0267382 94.3768363%2c21.6220703 L94.3758373%2c3.08694115 C94.884566%2c3.24434375 95.4244809%2c3.32900525 95.9838525%2c3.32900525 C96.6506785%2c3.32900525 97.2898545%2c3.20869291 97.88151%2c2.98826245 Z M100.429182%2c10.3453244 C99.7920929%2c10.3453244 98.6240964%2c10.4262579 97.8808258%2c10.5341694 L97.8808258%2c19.9494429 C98.385188%2c20.0573544 99.4735484%2c20.1382879 100.429182%2c20.1382879 C102.712084%2c20.1382879 103.269537%2c18.4926384 103.269537%2c16.2804538 L103.269537%2c14.2031585 C103.269537%2c11.9909739 102.712084%2c10.3453244 100.429182%2c10.3453244 Z' id='Combined-Shape' fill='black'%3e%3c/path%3e %3cpath d='M111.502687%2c8.72457747 C112.045508%2c8.72457747 112.570006%2c8.64485191 113.065463%2c8.49629404 L113.064781%2c16.5232546 C113.064781%2c19.3289521 114.073505%2c19.9764208 115.613137%2c19.9764208 L115.772409%2c19.9764208 C117.312041%2c19.9764208 118.320765%2c19.3289521 118.320765%2c16.5232546 L118.320226%2c8.4334735 C118.872544%2c8.62226395 119.463958%2c8.72457747 120.078886%2c8.72457747 C120.689352%2c8.72457747 121.276644%2c8.62374317 121.825517%2c8.43756894 L121.824755%2c16.5232546 C121.824755%2c22.4044283 117.338586%2c23.0518969 115.772409%2c23.0518969 L115.526483%2c23.0512514 C113.88817%2c23.0271041 109.560791%2c22.2994073 109.560791%2c16.5232546 L109.560465%2c8.36700801 C110.164542%2c8.59813531 110.819085%2c8.72457747 111.502687%2c8.72457747 Z' id='Combined-Shape' fill='black'%3e%3c/path%3e %3cpath d='M128.780182%2c3.03790128 L128.779643%2c22.269539 C128.779643%2c22.5662954 128.56728%2c22.836074 128.275281%2c22.836074 L125.806561%2c22.836074 C125.514562%2c22.836074 125.275653%2c22.5662954 125.275653%2c22.269539 L125.275475%2c3.04219481 C125.82418%2c3.22824247 126.411273%2c3.32900525 127.021522%2c3.32900525 C127.63645%2c3.32900525 128.227864%2c3.22669173 128.780182%2c3.03790128 Z' id='Combined-Shape' fill='black'%3e%3c/path%3e %3cpath d='M134.372549%2c3.32900525 C134.939348%2c3.32900525 135.48617%2c3.24208064 136.000812%2c3.08063296 L135.999985%2c22.269539 C135.999985%2c22.5662954 135.787622%2c22.836074 135.495623%2c22.836074 L133.026903%2c22.836074 C132.734904%2c22.836074 132.495995%2c22.5662954 132.495995%2c22.269539 L132.495929%2c2.99605058 C133.081688%2c3.21152525 133.713619%2c3.32900525 134.372549%2c3.32900525 Z' id='Combined-Shape' fill='black'%3e%3c/path%3e %3c/g%3e %3c/g%3e %3c/g%3e %3c/g%3e%3c/svg%3e)