Here is a list of the top turnover members and the table shows the concentration of volumes in the top 10, top 50, top 100 members out of the total volumes. Check the trends for BSE and the NSE below.

Month

BSE

NSE

5

10

25

50

100

5

10

25

50

100

Apr-10

13.6

21.1

36.7

52.7

70.9

14.8

24.3

42.3

58.4

72.8

May-10

14.8

21.8

37.7

54.1

71.9

14.7

24.6

43.5

60.0

74.2

Jun-10

14.7

22.1

38.3

54.2

72.0

14.6

24.4

41.9

58.1

72.8

Jul-10

13.7

21.1

36.7

52.8

70.9

14.7

24.3

42.7

57.9

72.5

Aug-10

13.7

22.3

38.2

53.5

71.2

14.8

24.2

41.7

57.0

72.0

Sep-10

13.8

22.6

37.8

52.5

70.4

14.9

25.0

43.5

58.7

73.2

Oct-10

13.1

21.5

37.1

52.6

70.7

14.3

23.9

42.1

57.9

72.5

Nov-10

13.8

22.5

38.0

52.8

71.4

13.7

23.9

43.3

59.0

73.7

Dec-10

14.9

23.6

39.6

54.1

71.4

13.8

24.3

43.6

59.6

74.3

Jan-11

15.0

24.2

40.3

55.4

72.7

14.2

24.6

44.9

61.4

76.1

Feb-11

16.4

25.2

40.3

55.7

73.0

13.8

23.9

45.4

62.0

77.1

Mar-11

15.0

23.3

37.7

52.3

69.7

14.1

23.5

43.6

59.5

74.6

Apr-11

25.5

33.7

47.0

60.2

75.3

14.6

24.5

44.8

60.9

75.7

May-11

15.3

24.0

39.0

54.8

72.4

13.7

24.8

45.9

61.5

76.5

Jun-11

16.0

24.4

40.5

55.7

72.7

14.2

24.9

45.2

61.2

76.1

Jul-11

16.0

23.6

39.2

54.4

72.0

14.8

24.7

44.6

60.5

75.6

Aug-11

15.1

22.9

38.8

54.7

72.0

15.2

26.1

46.8

63.3

77.8

Sep-11

15.4

25.6

40.2

55.3

72.6

14.2

24.5

45.7

62.6

77.5

Oct-11

16.3

24.9

39.9

55.5

72.8

14.4

25.5

46.5

62.4

77.4

Nov-11

16.9

25.1

40.7

56.5

72.5

15.4

26.6

48.0

63.8

78.3

Dec-11

17.5

26.5

42.5

57.5

73.7

16.7

27.6

48.3

64.3

78.8

Jan-12

18.5

27.5

42.4

57.6

74.4

15.6

26.2

46.8

63.6

78.3

Feb-12

17.4

26.1

40.8

56.9

73.9

16.9

27.7

48.6

64.8

79.1

Mar-12

16.4

26.2

42.9

57.9

73.8

16.0

25.8

47.1

63.8

78.4

Apr-12

15.5

23.4

39.4

54.9

72.0

15.6

25.8

46.9

63.6

78.2

May-12

16.2

24.3

40.6

56.2

72.4

15.4

26.2

48.7

65.2

79.5

Jun-12

14.9

23.6

40.0

56.6

73.1

15.7

26.3

46.9

63.7

78.4

Jul-12

15.2

23.9

39.3

55.2

71.7

15.2

25.6

47.0

63.8

78.4

Aug-12

15.4

22.9

38.6

54.6

71.8

14.3

24.5

45.2

62.5

77.2

Sep-12

15.4

23.6

39.6

55.2

71.7

15.0

25.7

47.7

64.2

78.6

Oct-12

16.5

25.4

40.6

55.8

72.3

14.3

24.4

45.1

61.8

76.7

Nov-12

16.0

24.5

40.5

55.6

71.9

14.0

24.0

45.7

61.9

76.5

Dec-12

16.0

23.6

38.9

54.3

70.8

14.4

24.8

45.0

61.2

76.2

Jan-13

16.5

24.7

40.8

55.7

71.3

14.6

25.9

47.0

63.0

77.9

Feb-13

21.9

33.2

48.9

62.3

76.3

13.6

25.5

48.9

65.3

79.3

Mar-13

16.8

25.1

41.6

57.6

73.1

14.3

26.5

50.2

66.3

80.4

Apr-13

18.2

26.3

42.4

58.0

74.5

14.2

25.3

47.7

65.1

80.0

May-13

21.3

31.5

48.0

62.2

76.8

14.1

25.0

46.2

64.2

79.5

Jun-13

19.3

27.9

44.3

58.5

74.3

14.0

25.7

48.6

65.6

79.8

Jul-13

18.7

27.3

44.4

58.4

74.0

14.5

25.6

47.8

65.2

79.5

Aug-13

20.6

29.1

45.6

61.1

75.9

14.5

26.7

50.3

67.8

82.0

Sep-13

19.5

27.7

42.3

57.6

73.5

15.0

26.7

48.9

66.1

80.6

Oct-13

18.3

26.3

42.3

57.1

72.7

15.2

24.8

45.8

63.3

78.5

Nov-13

17.4

26.9

42.9

58.3

73.9

14.2

24.1

44.9

63.2

78.3

Dec-13

17.0

25.9

42.1

57.8

73.8

14.1

24.2

45.5

63.1

78.0

Jan-14

14.9

24.5

42.1

59.7

75.3

13.6

24.3

45.7

63.4

78.3

Feb-14

14.2

22.6

39.8

56.8

73.3

14.1

24.8

46.7

64.0

78.7

Mar-14

16.1

27.3

47.6

64.1

77.7

14.5

24.9

46.6

64.4

79.9

Apr-14

16.4

27.3

45.5

62.6

77.9

14.7

25.4

45.4

63.5

79.4

May-14

20.4

33.2

52.8

67.7

81.0

14.4

25.2

47.7

65.2

80.4

Jun-14

19.6

28.5

46.1

62.9

77.7

14.5

24.7

46.3

63.4

78.6

Jul-14

20.9

31.7

47.9

64.1

78.3

15.3

26.1

46.8

63.9

78.9

Aug-14

18.7

28.8

46.3

62.1

76.5

15.2

26.3

47.9

64.5

79.0

Sep-14

18.3

29.5

48.3

63.6

77.6

15.0

25.5

46.2

63.3

78.4

Oct-14

18.3

28.5

48.0

63.9

78.1

15.2

25.7

48.1

65.3

79.8

Nov-14

18.6

28.8

48.0

64.6

77.7

15.5

26.0

48.2

65.1

79.4

Dec-14

19.5

28.8

47.7

63.0

76.7

16.4

27.7

49.5

66.3

80.1

Jan-15

20.3

31.5

52.1

67.5

79.8

15.3

26.8

49.6

66.3

80.3

Feb-15

21.1

32.1

53.0

67.7

80.1

17.0

29.1

50.4

67.2

81.0

Mar-15

20.0

31.2

51.2

66.9

79.5

16.3

29.0

51.1

67.9

81.5

Apr-15

19.5

32.0

52.2

67.7

80.4

20.6

32.3

53.7

69.4

82.5

May-15

22.1

34.2

55.0

69.7

81.3

18.7

31.2

54.6

70.7

83.4

Jun-15

26.4

36.2

55.0

68.6

80.5

17.8

29.2

52.0

68.7

81.8

Jul-15

20.2

30.5

48.9

64.0

78.0

16.8

27.2

48.8

66.0

80.1

Aug-15

26.6

36.8

54.1

67.9

80.3

18.4

30.1

52.1

69.0

82.2

Sep-15

24.0

34.6

54.2

69.1

81.9

19.9

32.3

52.7

69.5

82.7

Oct-15

21.6

31.7

49.5

64.5

79.0

17.0

27.6

48.8

66.6

81.1

Nov-15

22.2

31.6

50.3

64.8

78.7

16.1

27.4

50.4

67.4

81.6

Dec-15

20.3

30.0

48.0

63.0

77.6

16.8

27.5

47.7

65.0

79.7

Jan-16

22.7

32.7

51.4

65.5

79.3

18.6

29.4

50.5

67.8

81.6

Feb-16

25.1

35.0

54.2

69.3

81.4

20.5

31.3

52.6

70.3

83.7

Mar-16

22.9

34.3

54.1

69.1

81.6

18.4

29.9

52.0

69.4

82.9

Apr-16

25.1

34.9

53.7

68.5

81.5

18.1

29.4

51.4

69.2

82.8

May-16

21.1

31.5

52.6

67.7

80.9

17.6

29.0

52.2

69.3

82.8

Jun-16

19.5

29.5

50.7

66.4

80.0

17.6

28.1

49.4

67.0

81.0

Jul-16

20.5

30.4

51.1

67.1

80.4

17.5

28.2

48.4

66.1

80.4

Aug-16

23.6

34.1

53.9

68.2

81.0

18.5

28.8

50.5

68.0

81.7

Sep-16

21.4

32.6

53.0

67.9

81.0

19.0

29.7

50.6

67.6

81.2

Oct-16

26.1

37.6

57.8

71.5

83.2

18.3

28.6

49.4

66.9

80.7

Nov-16

23.7

35.8

55.6

70.2

82.3

20.8

32.0

55.6

72.4

84.8

Dec-16

18.8

30.2

51.0

67.5

81.5

19.1

30.5

52.6

69.6

83.0

Jan-17

18.0

28.9

50.6

67.0

80.8

18.3

29.4

50.7

67.7

81.8

Feb-17

21.2

32.8

53.9

69.3

81.6

19.3

30.2

52.6

69.5

82.6

Mar-17

65.4

71.8

81.1

88.8

93.4

19.0

29.6

51.6

69.1

82.2

Apr-17

20.4

32.0

53.6

69.2

81.6

18.1

29.4

51.4

69.2

82.8

May-17

22.8

35.0

54.7

70.4

83.0

19.3

30.5

52.2

69.1

82.2

Jun-17

32.6

43.4

63.6

76.6

86.6

19.2

31.7

52.8

69.3

82.0

Jul-17

20.6

32.6

53.4

69.0

81.8

18.8

30.1

50.0

67.3

81.1

Aug-17

23.6

35.3

57.5

72.3

83.2

20.1

31.9

53.0

69.5

82.8

Sep-17

23.8

35.4

55.6

70.0

82.2

18.9

30.2

50.7

68.2

81.9

Oct-17

23.7

35.2

55.0

69.4

82.0

19.6

30.6

50.8

68.0

82.1

Nov-17

31.2

42.8

61.2

74.7

84.8

19.3

30.7

51.2

67.8

81.6

Dec-17

31.7

43.2

63.5

76.8

86.3

19.7

31.7

51.9

68.2

82.0

Jan-18

21.7

34.5

56.0

71.2

83.1

20.0

32.0

51.9

67.8

81.8

Feb-18

23.5

36.7

56.6

71.4

83.1

21.8

34.2

54.9

71.3

84.4

Mar-18

21.0

32.7

55.1

71.1

83.1

21.5

33.4

55.0

71.2

84.6

Apr-18

21.3

35.8

56.4

69.9

82.8

21.7

34.0

53.6

69.5

83.7

May-18

22.5

36.1

58.2

72.2

83.9

21.0

32.5

53.7

70.7

84.8

Jun-18

24.5

37.9

60.4

73.4

84.5

21.0

31.6

53.7

71.0

84.8

Jul-18

24.6

38.5

62.3

74.9

85.1

22.5

34.0

54.1

71.5

85.4

Aug-18

25.0

39.4

60.6

72.9

83.6

22.4

34.5

54.1

71.6

85.0

Sep-18

35.2

48.7

68.5

79.2

87.9

22.2

34.8

56.0

73.8

86.6

Oct-18

30.3

45.7

67.6

78.2

86.8

22.8

35.4

56.3

74.0

87.2

Nov-18

29.8

43.7

64.7

76.6

86.6

23.2

35.4

56.0

73.8

86.5

Dec-18

31.0

45.3

64.3

75.9

85.6

25.4

38.2

57.0

74.2

86.7

One clear trend over the last 10 years has been the gradual and relentless institutionalization of the Indian stock markets. The top 10-15 brokers (most of them FII brokers) have become the most active with a much bigger market shares as smaller brokers are going out of business and larger brokers are concentrating more volumes in them through a mix of co-location advantages and algorithmic trading.