Read the following texts and table with financial data from an S&P 500 earnings report carefully.Based on the question-answer history (if provided), answer the last question. The answer may require mathematical calculation based on the data provided.

Text: the company 2019s stock performance the following graph compares cumulative total return of the company 2019s common stock with the cumulative total return of ( i ) the nasdaq stock market-united states , and ( ii ) the nasdaq biotechnology index . the graph assumes ( a ) $ 100 was invested on july 31 , 2001 in each of the company 2019s common stock , the stocks comprising the nasdaq stock market-united states and the stocks comprising the nasdaq biotechnology index , and ( b ) the reinvestment of dividends . comparison of 65 month cumulative total return* among alexion pharmaceuticals , inc. , the nasdaq composite index and the nasdaq biotechnology index alexion pharmaceuticals , inc . nasdaq composite nasdaq biotechnology . <table class='wikitable'><tr><td>1</td><td>-</td><td>7/02</td><td>7/03</td><td>7/04</td><td>7/05</td><td>12/05</td><td>12/06</td><td>12/07</td></tr><tr><td>2</td><td>alexion pharmaceuticals inc .</td><td>100.00</td><td>108.38</td><td>102.64</td><td>167.89</td><td>130.56</td><td>260.41</td><td>483.75</td></tr><tr><td>3</td><td>nasdaq composite</td><td>100.00</td><td>128.98</td><td>142.51</td><td>164.85</td><td>168.24</td><td>187.43</td><td>204.78</td></tr><tr><td>4</td><td>nasdaq biotechnology</td><td>100.00</td><td>149.29</td><td>146.51</td><td>176.75</td><td>186.10</td><td>183.89</td><td>187.04</td></tr></table> .
Question: what was the value of the alexion pharmaceuticals inc . in march?
Answer: 108.38
Question: and what was it in february?

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