São Paulo, October 31, 2017.

To

B3 - BRASIL, BOLSA, BALCÃO ("B3")

Praça Antônio Prado, 48, 2º andar CEP 01010-010, São Paulo - SP

COMPANY OVERSIGHT DEPARTMENT

Attn.: Mr. Nelson Ortega Barroso - Company Oversight Superintendent

CC.: BRAZILIAN SECURITIES AND EXCHANGE COMMISSION (CVM)

Attn.: Mr. Fernando Soares Vieira - Company Relations Superintendent

Mr. Francisco José Bastos Santos - Market Relations and Intermediaries Superintendent

REF: OFFICIAL LETTERS NO. 1689/2017-SAE AND 1690/2017-SAE

Dear Sirs,

With regard to Official Letters 1689/2017-SAE and 1690/2017-SAE ("Letters") received today, through which you requested clarifications from Braskem S.A. ("Braskem" or "Company"), as transcribed below:

Official Letter 1689/2017-SAE

"Ref.: Unusual trading movements

Dear Sirs,

Considering the recent oscillations in the number of trades and trading volume of shares issued by your company, we request you to inform us, by 9:00 a.m. on 10/31/2017, if there is any fact you are of aware of that could justify them.

Common Shares

Prices (R$ per share)

Date

Opening

Minimum

Maximum

Average

Closing

Var.

%

No. Trades

Number

Volume

10/17/2017

47.00

46.02

47.00

46.76

46.02

-2.09

3

400

18,702.00

10/18/2017

46.30

46.01

46.35

46.19

46.01

-0.02

12

3,400

157,038.00

10/19/2017

46.00

45.99

46.99

46.47

46.89

1.91

16

3,000

139,412.00

10/20/2017

46.89

46.89

47.88

47.25

47.86

2.07

11

3,500

165,377.00

10/23/2017

47.85

47.85

47.85

47.85

47.85

-0.02

1

200

9,570.00

10/24/2017

47.21

45.63

47.21

46.67

47.00

-1.80

7

700

32,666.00

10/25/2017

47.99

47.00

47.99

47.62

47.79

1.68

3

700

33,335.00

10/26/2017

46.61

46.13

47.78

46.26

46.13

-3.47

16

20,400

943,724.00

10/27/2017

46.50

46.50

46.75

46.69

46.50

0.80

14

9,700

452,888.00

10/30/2017*

47.47

47.47

51.45

49.57

51.45

10.64

21

4,900

242,913.00

Preferred Shares

Prices (R$ per share)

Date

Opening

Minimum

Maximum

Average

Closing

Var.

%

No. Trades

Number

Volume

10/17/2017

46.79

46.29

47.51

46.67

46.31

-1.05

9,295

2,105,400

98,256,067.00

10/18/2017

46.51

46.41

47.18

46.66

46.54

0.50

9,712

1,461,000

68,177,064.00

10/19/2017

46.54

45.61

47.26

46.52

46.48

-0.13

8,770

1,571,700

73,112,381.00

10/20/2017

46.71

46.71

47.89

47.46

47.37

1.91

6,570

1,239,400

58,827,690.00

Preferred Shares

Prices (R$ per share)

Date

Opening

Minimum

Maximum

Average

Closing

Var.

%

No. Trades

Number

Volume

10/23/2017

47.64

45.73

47.74

46.33

46.22

-2.43

9,195

1,473,700

68,278,648.00

10/24/2017

46.22

45.78

47.53

46.87

47.47

0.21

10,046

1,808,500

84,756,346.00

10/25/2017

47.56

46.59

48.07

47.32

47.64

0.36

6,403

1,484,700

70,254,474.00

10/26/2017

47.87

47.24

48.10

47.65

47.52

-0.25

6,390

1,064,000

50,694,703.00

10/27/2017

47.52

47.11

48.34

47.67

47.56

0.08

10,050

1,458,700

69,533,639.00

10/30/2017*

47.50

46.57

54.12

49.78

53.20

11.85

9,254

1,968,100

97,989,598.00

  • Updated till 3:51 p.m."

    Official Letter 1690/2017-SAE

    "Ref.: Request for clarification on news report

    Dear Sirs,

    Complementing our official letter 1689/2017-SAE below, in light of the news item published in InfoMoney on 10/30/2017, entitled "Braskem escapes Ibovespa "sell off" and jumps 12% with rumor about acquisition; steel companies sink 5%", mentioning, among others, that:

  • The shares of Braskem skyrocket during this session after rumors about the company's acquisition by LyondellBasell;

  • The movement occurs after LyondellBasell approached Braskem for a possible acquisition, which could value the company at over US$ 10 billion."

In this regard, Braskem clarifies that:

  1. it was not approached by LyondellBasell with any proposal for acquisition of its shares and is unaware of any other fact that could have justified the unusual trading on the Company's shares between October 17, 2017 and October 30, 2017;

  2. the suitability and timeliness of disposing of Braskem's shares is a decision that rests solely with its shareholders; and

  3. in this regard, the management of Braskem requested clarifications to Odebrecht, its controlling shareholder, which informed that it keeps working on alternatives to add value to Braskem and for all shareholders, and reaffirmed its intention of keeping Braskem as part of the group investments.

For more information, contact Braskem's Investor Relations Department by calling +55 (11) 3576-9531 or sending an e-mail to braskem-ri@braskem.com.br

Sincerely,

Pedro Van Langendonck Teixeira de Freitas Chief Financial and Investor Relations Officer Braskem S.A.

Braskem SA published this content on 31 October 2017 and is solely responsible for the information contained herein.
Distributed by Public, unedited and unaltered, on 31 October 2017 11:12:01 UTC.

Original documenthttp://www.braskem-ri.com.br/download/RI/21649

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