From the charters and the balance sheets of the Julien Le Blan company, operating cotton and linen spinning mills in Lille, this article analyzes the financial strategies of a family-owned textile company in the region of Lille during the second half of the nineteenth century, so as to find out the factors of regional financial autonomy to which textile industries thriving activity in this district contributed greatly. The company that was chosen is an example of the growth of family capitalism through the split of a group and specialization of the family branches. Its balance sheets, expressed in the accounts the financial structure of the company, show how the management of the private funds met the following demands: of profitability and concealing real figures from the tax department. Resorting on a structural basis to short-term debt urges us to question the notion of the financial independence of family businesses in Lille and to redefine the function of self-financing within group strategies. This debt, which used to rely on various solidarities, but above all family solidarities, enabled to efficiently blend the growth and uphold family control over the companies. It is thus in the system of these solidarities that we must look for regional financial autonomy.