Exhibit 21.1

SUBSIDIARIES OF REGISTRANT

MicroStrategy Incorporated’s subsidiaries as of February 20, 2015 are listed below.

821,393 LLC (Delaware) |  | MicroStrategy Deutschland GmbH (Germany)
Alert Media Group LLC (Delaware) |  | MicroStrategy France SARL (France)
Alert Media Group II LLC (Delaware) |  | MicroStrategy Holdings (Hong Kong) Co. Ltd. (Hong Kong)
MicroStrategy Administration Corporation (Delaware) |  | MicroStrategy Ibérica, S.L.U. (Spain)
MicroStrategy Enterprises, Inc. (Delaware) |  | MicroStrategy India Private Limited (India)
MicroStrategy Management Corporation (Delaware) |  | MicroStrategy International Limited (Bermuda)
MicroStrategy Services Corporation (Delaware) |  | MicroStrategy International II Limited (Bermuda)
Reporting Technologies, Inc. (Delaware) |  | MicroStrategy Italy S.r.l. (Italy)
SMCR Corp. (Delaware) |  | MicroStrategy Japan Kabushiki Kaisha (MicroStrategy Japan Inc.) (Japan)
Strategy.com Incorporated (Delaware) |  | MicroStrategy Korea Co., Ltd. (Korea)
Strategy Inc. (Delaware) |  | MicroStrategy Limited (United Kingdom)
Usher Incorporated (Delaware) |  | MicroStrategy México, S. de R.L. de C.V. (Mexico)
AMG International C.V. (Netherlands) |  | MicroStrategy Middle East FZ-LLC (UAE — Dubai Free Zone)
Alert Media Group International B.V. (Netherlands) |  | MicroStrategy Poland sp. z. o. o. (Poland)
Limited Liability Company MicroStrategy (Russia) |  | MicroStrategy Portugal, Sociedade Unipessoal, Lda. (Portugal)
MicroStrategy Austria GmbH (Austria) |  | MicroStrategy Pty. Ltd. (Australia)
MicroStrategy Belgium BVBA (Belgium) |  | MicroStrategy Singapore Pte. Ltd. (Singapore)
MicroStrategy Beijing R&D Center (China) |  | MicroStrategy Software (Shanghai) Co., Ltd. (China)

MicroStrategy Benelux B.V. (Netherlands) |  | MicroStrategy South Africa (Proprietary) Limited (South Africa)
MicroStrategy Brasil Ltda. (Brazil) |  | MicroStrategy Sweden AB (Sweden)
MicroStrategy Canada Incorporated (Canada) |  | MicroStrategy Switzerland GmbH (Switzerland)
MicroStrategy China Technology Center Limited (China) |  | MicroStrategy Yazilim Hizmetleri Ve Ürünleri Limited Şirketi (Turkey)
MicroStrategy Denmark ApS (Denmark) |  | Strategy.com International Limited (Bermuda)