def api_symbol_groups(sec_dict):
    """Groups symbols in sec_dict into lists of 100 and returns list of lists."""
    symbols = list(sec_dict.keys())
    sym_groups = []
    count = 0
    temp_list = []
    for sym in symbols:
        temp_list.append(sym)
        count += 1
        if count % 100 == 0:
            sym_groups.append(temp_list)
            temp_list = []
    if temp_list != []:
        sym_groups.append(temp_list)
    return sym_groups