Suspicious Trading

Could someone please explain to a newbie what is up with all these tiny trades? I have been watching this happen for weeks now and it baffles me!

	Column 1	Column 2	Column 3	Column 4	Column 5
0	3:50:59 PM	1.255	5	6.275
1	3:48:19 PM	1.255	3	3.765
2	3:48:19 PM	1.255	22	27.610
3	3:48:19 PM	1.255	224	281.120
4	3:48:19 PM	1.255	8	10.040
5	3:47:21 PM	1.250	22	27.500
6	3:46:21 PM	1.250	328	410.000
7	3:45:55 PM	1.255	110	138.050
8	3:40:49 PM	1.250	500	625.000
9	3:40:39 PM	1.250	16	20.000
10	3:40:39 PM	1.250	2,023	2,528.750
11	3:40:39 PM	1.250	527	658.750
12	3:40:39 PM	1.250	20	25.000
13	3:40:39 PM	1.250	66	82.500
14	3:40:39 PM	1.250	47	58.750
15	3:40:39 PM	1.250	459	573.750
16	3:40:39 PM	1.250	4,897	6,121.250
17	3:37:20 PM	1.245	3	3.735	XT
18	3:37:05 PM	1.240	1	1.240
19	3:36:50 PM	1.240	18	22.320
20	3:36:02 PM	1.250	11	13.750
21	3:36:02 PM	1.245	1	1.245
22	3:33:06 PM	1.245	20	24.900
23	3:29:18 PM	1.245	11	13.695	XT
24	3:28:58 PM	1.240	79	97.960
25	3:22:13 PM	1.240	3	3.720
26	3:22:11 PM	1.2425	3	3.728	CXXT
27	3:22:11 PM	1.245	14	17.430
28	3:21:50 PM	1.245	125	155.625
29	3:21:10 PM	1.245	8	9.960
30	3:21:04 PM	1.2475	6	7.485	CXXT
31	3:20:50 PM	1.245	25	31.125
32	3:20:50 PM	1.245	28	34.860
33	3:19:51 PM	1.245	2	2.490	XT
34	3:19:36 PM	1.245	21	26.145
35	3:14:39 PM	1.245	9	11.205	XT
36	3:14:19 PM	1.240	72	89.280
37	3:12:51 PM	1.245	3	3.735	XT
38	3:12:36 PM	1.245	22	27.390
39	3:08:57 PM	1.245	3	3.735	XT
40	3:08:50 PM	1.240	1	1.240
41	3:08:35 PM	1.240	25	31.000
42	3:06:06 PM	1.250	10	12.500
43	2:59:56 PM	1.245	8	9.960	XT
44	2:59:40 PM	1.240	65	80.600
45	2:56:21 PM	1.245	3	3.735	XT
46	2:56:06 PM	1.245	2	2.490	XT
47	2:56:06 PM	1.245	21	26.145
48	2:55:50 PM	1.245	21	26.145
49	2:51:08 PM	1.250	5	6.250
50	2:45:17 PM	1.245	7	8.715	XT
51	2:45:02 PM	1.240	57	70.680
52	2:44:15 PM	1.245	9	11.205	XT
53	2:44:00 PM	1.245	321	399.645	XT
54	2:44:00 PM	1.245	70	87.150
55	2:36:25 PM	1.245	1	1.245
56	2:36:10 PM	1.250	6	7.500
57	2:32:55 PM	1.245	7	8.715
58	2:32:35 PM	1.245	24	29.880
59	2:32:35 PM	1.245	24	29.880
60	2:21:12 PM	1.250	5	6.250
61	2:15:22 PM	1.240	8	9.920
62	2:10:01 PM	1.240	14	17.360
63	2:09:45 PM	1.240	28	34.720
64	2:09:45 PM	1.240	28	34.720
65	2:08:35 PM	1.235	2	2.470	XT
66	2:06:14 PM	1.240	4	4.960
67	2:05:24 PM	1.240	7	8.680
68	2:05:24 PM	1.240	98	121.520
69	2:03:20 PM	1.235	26	32.110
70	2:03:05 PM	1.235	25	30.875
71	2:01:05 PM	1.230	43	52.890	XT
72	1:58:10 PM	1.235	4	4.940	XT
73	1:56:44 PM	1.230	1	1.230
74	1:54:35 PM	1.235	26	32.110
75	1:51:16 PM	1.250	4	5.000
76	1:46:27 PM	1.230	40	49.200	XT
77	1:37:11 PM	1.245	5	6.225
78	1:37:11 PM	1.245	2	2.490
79	1:36:18 PM	1.245	4	4.980