=============================================================================
                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549
                                 SCHEDULE 13D
                Under the Securities and Exchange Act of 1934



                                Bioverativ Inc.
               ------------------------------------------------
                               (Name of Issuer)

                                 Common Stock
                ------------------------------------------------
                        (Title of Class of Securities)

                                  09075E100
                ------------------------------------------------
                               (CUSIP Number)

                           Allison Bennington, Esq.
                              ValueAct Capital
                 One Letterman Drive, Building D, Fourth Floor
                          San Francisco, CA  94129
                               (415) 362-3700
                ------------------------------------------------
                 (Name, address and telephone number of Person
                Authorized to Receive Notices and Communications)

                           Allison Bennington, Esq.
                              ValueAct Capital
                 One Letterman Drive, Building D, Fourth Floor
                          San Francisco, CA  94129
                               (415) 362-3700

                               February 6, 2017
                ------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition that is the subject of this Schedule 13D, and is filing this
schedule because of 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the
following box [ ].

Note:  Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Rule 240.13d-7 for other
parties to whom copies are to be sent.

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities,
and for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

This information required on the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).
=============================================================================


                                SCHEDULE 13D
--------------------------                          -------------------------
CUSIP NO. 09075E100                                             Page 2 of 15
-----------------------------------------------------------------------------
1. NAME OF REPORTING PERSON/S.S. OR I.R.S. INDENTIFICATION NO. OF ABOVE
   PERSON (entities only)

   ValueAct Capital Master Fund, L.P.
-----------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                  (a) [X]
                                                                      (b) [ ]
-----------------------------------------------------------------------------
3. SEC USE ONLY

-----------------------------------------------------------------------------
4. SOURCE OF FUNDS (See Instructions)*

   WC*
-----------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
   PURSUANT TO ITEMS 2(d) or 2(e)                                         [ ]
-----------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION

   British Virgin Islands
-----------------------------------------------------------------------------
                    7.  SOLE VOTING POWER
                        0
   NUMBER OF       ----------------------------------------------------------
   SHARES           8.  SHARED VOTING POWER
   BENEFICIALLY         7,700,000**
   OWNED BY EACH   ----------------------------------------------------------
   PERSON WITH      9.  SOLE DISPOSITIVE POWER
                        0
                   ----------------------------------------------------------
                   10.  SHARED DISPOSITIVE POWER
                        7,700,000**
-----------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    7,700,000**
-----------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
    CERTAIN SHARES                                                        [ ]
-----------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    7.1%
-----------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON

    PN
-----------------------------------------------------------------------------
*See Item 3
**See Item 2 and 5




                                SCHEDULE 13D
--------------------------                          -------------------------
CUSIP NO. 09075E100                                             Page 3 of 15
----------------------------------------------------------------------------
1. NAME OF REPORTING PERSON/S.S. OR I.R.S. INDENTIFICATION NO. OF ABOVE
   PERSON (entities only)

   VA Partners I, LLC
-----------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                  (a) [X]
                                                                      (b) [ ]
-----------------------------------------------------------------------------
3. SEC USE ONLY

-----------------------------------------------------------------------------
4. SOURCE OF FUNDS*

   00*
-----------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
   PURSUANT TO ITEMS 2(d) or 2(e)                                         [ ]
-----------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION

   Delaware
-----------------------------------------------------------------------------
                    7.  SOLE VOTING POWER
                        0
   NUMBER OF       ----------------------------------------------------------
   SHARES           8.  SHARED VOTING POWER
   BENEFICIALLY         7,700,000**
   OWNED BY EACH   ----------------------------------------------------------
   PERSON WITH      9.  SOLE DISPOSITIVE POWER
                        0
                   ----------------------------------------------------------
                   10.  SHARED DISPOSITIVE POWER
                        7,700,000**
-----------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    7,700,000**
-----------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
    CERTAIN SHARES                                                        [ ]
-----------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    7.1%
-----------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON

    00 (LLC)
-----------------------------------------------------------------------------
*See Item 3
**See Item 2 and 5


                                SCHEDULE 13D
--------------------------                          -------------------------
CUSIP NO. 09075E100                                             Page 4 of 15
----------------------------------------------------------------------------
1. NAME OF REPORTING PERSON/S.S. OR I.R.S. INDENTIFICATION NO. OF ABOVE
   PERSON (entities only)

   ValueAct Capital Management, L.P.
-----------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                  (a) [X]
                                                                      (b) [ ]
-----------------------------------------------------------------------------
3. SEC USE ONLY

-----------------------------------------------------------------------------
4. SOURCE OF FUNDS*

   00*
-----------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
   PURSUANT TO ITEMS 2(d) or 2(e)                                         [ ]
-----------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION

   Delaware
-----------------------------------------------------------------------------
                    7.  SOLE VOTING POWER
                        0
   NUMBER OF       ----------------------------------------------------------
   SHARES           8.  SHARED VOTING POWER
   BENEFICIALLY         7,700,000**
   OWNED BY EACH   ----------------------------------------------------------
   PERSON WITH      9.  SOLE DISPOSITIVE POWER
                        0
                   ----------------------------------------------------------
                   10.  SHARED DISPOSITIVE POWER
                        7,700,000**
-----------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    7,700,000**
-----------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
    CERTAIN SHARES                                                        [ ]
-----------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    7.1%
-----------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON

    PN
-----------------------------------------------------------------------------
*See Item 3
**See Item 2 and 5


                                SCHEDULE 13D
--------------------------                          -------------------------
CUSIP NO. 09075E100                                             Page 5 of 15
----------------------------------------------------------------------------
1. NAME OF REPORTING PERSON/S.S. OR I.R.S. INDENTIFICATION NO. OF ABOVE
   PERSON (entities only)

   ValueAct Capital Management, LLC
-----------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                  (a) [X]
                                                                      (b) [ ]
-----------------------------------------------------------------------------
3. SEC USE ONLY

-----------------------------------------------------------------------------
4. SOURCE OF FUNDS*

   00*
-----------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
   PURSUANT TO ITEMS 2(d) or 2(e)                                         [ ]
-----------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION

   Delaware
-----------------------------------------------------------------------------
                    7.  SOLE VOTING POWER
                        0
   NUMBER OF       ----------------------------------------------------------
   SHARES           8.  SHARED VOTING POWER
   BENEFICIALLY         7,700,000**
   OWNED BY EACH   ----------------------------------------------------------
   PERSON WITH      9.  SOLE DISPOSITIVE POWER
                        0
                   ----------------------------------------------------------
                   10.  SHARED DISPOSITIVE POWER
                        7,700,000**
-----------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    7,700,000**
-----------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
    CERTAIN SHARES                                                        [ ]
-----------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    7.1%
-----------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON

    00 (LLC)
-----------------------------------------------------------------------------
*See Item 3
**See Item 2 and 5


                                SCHEDULE 13D
--------------------------                          -------------------------
CUSIP NO. 09075E100                                             Page 6 of 15
-----------------------------------------------------------------------------
1. NAME OF REPORTING PERSON/S.S. OR I.R.S. INDENTIFICATION NO. OF ABOVE
   PERSON (entities only)

   ValueAct Holdings, L.P.
---------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                  (a) [X]
                                                                      (b) [ ]
-----------------------------------------------------------------------------
3. SEC USE ONLY

---------------------------------------------------------------------------
4. SOURCE OF FUNDS*

   00*
-----------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
   PURSUANT TO ITEMS 2(d) or 2(e)                                         [ ]
-----------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION

   Delaware
-----------------------------------------------------------------------------
                    7.  SOLE VOTING POWER
                        0
   NUMBER OF       ----------------------------------------------------------
   SHARES           8.  SHARED VOTING POWER
   BENEFICIALLY         7,700,000**
   OWNED BY EACH   ----------------------------------------------------------
   PERSON WITH      9.  SOLE DISPOSITIVE POWER
                        0
                   ----------------------------------------------------------
                   10.  SHARED DISPOSITIVE POWER
                        7,700,000**
-----------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    7,700,000**
-----------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
    CERTAIN SHARES                                                        [ ]
-----------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    7.1%
-----------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON

    PN
-----------------------------------------------------------------------------
*See Item 3
**See Items 2 and 5


                                SCHEDULE 13D
--------------------------                          -------------------------
CUSIP NO. 09075E100                                             Page 7 of 15
-----------------------------------------------------------------------------
1. NAME OF REPORTING PERSON/S.S. OR I.R.S. INDENTIFICATION NO. OF ABOVE
   PERSON (entities only)

   ValueAct Holdings GP, LLC
---------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                  (a) [X]
                                                                      (b) [ ]
-----------------------------------------------------------------------------
3. SEC USE ONLY

-----------------------------------------------------------------------------
4. SOURCE OF FUNDS*

   00*
-----------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
   PURSUANT TO ITEMS 2(d) or 2(e)                                        [ ]
-----------------------------------------------------------------------------
6. CITIZENSHIP OR PLACE OF ORGANIZATION

   Delaware
-----------------------------------------------------------------------------
                   7.  SOLE VOTING POWER
                        0
   NUMBER OF       ----------------------------------------------------------
   SHARES          8.  SHARED VOTING POWER
   BENEFICIALLY        7,700,000**
   OWNED BY EACH   ----------------------------------------------------------
   PERSON WITH     9.  SOLE DISPOSITIVE POWER
                        0
                   ----------------------------------------------------------
                   10.  SHARED DISPOSITIVE POWER
                        7,700,000**
-----------------------------------------------------------------------------
11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    7,700,000**
-----------------------------------------------------------------------------
12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
    CERTAIN SHARES                                                        [ ]
-----------------------------------------------------------------------------
13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    7.1%
-----------------------------------------------------------------------------
14. TYPE OF REPORTING PERSON

    00 (LLC)
-----------------------------------------------------------------------------
*See Item 3
**See Items 2 and 5





--------------------------                          -------------------------
CUSIP NO. 09075E100                                             Page 8 of 15
-----------------------------------------------------------------------------

Item 1.     Security and Issuer

     This Schedule 13D relates to the Common Stock (the "Common Stock") of
Bioverativ Inc., a Delaware Corporation (the "Issuer"). The address
of the principal executive offices of the Issuer is 225 2nd Avenue, Waltham,
MA 02451.

Item 2.     Identity and Background

     This statement is filed jointly by (a) ValueAct Capital Master Fund,
L.P. ("ValueAct Master Fund"), (b) VA Partners I, LLC ("VA Partners I"), (c)
ValueAct Capital Management, L.P. ("ValueAct Management L.P."), (d) ValueAct
Capital Management, LLC ("ValueAct Management LLC"), (e) ValueAct Holdings,
L.P. ("ValueAct Holdings") and (f) ValueAct Holdings GP, LLC ("ValueAct
Holdings GP") (collectively, the "Reporting Persons").

     ValueAct Master Fund is a limited partnership organized under the laws
of the British Virgin Islands. It has a principal business address of One
Letterman Drive, Building D, Fourth Floor, San Francisco, CA 94129.

     VA Partners I is a Delaware limited liability company, the principal
business of which is to serve as the General Partner to ValueAct Master Fund.
It has a principal business address of One Letterman Drive, Building D,
Fourth Floor, San Francisco, CA 94129.

     ValueAct Management L.P. is a Delaware limited partnership which
renders management services to ValueAct Master Fund. ValueAct Management LLC
is a Delaware limited liability company, the principal business of which is
to serve as the General Partner to ValueAct Management L.P. Each has a
principal business address of One Letterman Drive, Building D, Fourth Floor,
San Francisco, CA 94129.

     ValueAct Holdings is a Delaware limited partnership and is the sole
Owner of the limited partnership interests of ValueAct Management L.P. and
the membership interests of ValueAct Management LLC and is the majority owner
of the membership interests of VA Partners I. ValueAct Holdings GP is a
Delaware limited liability company, the principal business of which is to
serve as the General Partner to ValueAct Holdings. Each has a principal
business address of One Letterman Drive, Building D, Fourth Floor, San
Francisco, CA 94129.

     (d) and (e). None of the entities or persons identified in this Item 2
has during the past five years been convicted of any criminal proceeding
(excluding traffic violations or similar misdemeanors), nor been a party to a
civil proceeding of a judicial or administrative body of competent judgment,
decree or final order enjoining future violations of, or prohibiting or
mandating activities subject to, federal or state securities laws or finding
any violation with respect to such laws.

Item 3.     Source and Amount of Funds or Other Consideration

     The source of funds used for the purchase of the Issuer?s securities and
the Number of Forward Shares was the working capital of ValueAct Master Fund.
The aggregate funds used by these Reporting Persons to make such purchases
were $336,094,994.93.

--------------------------                          -------------------------
CUSIP NO. 09075E100                                             Page 9 of 15
-----------------------------------------------------------------------------

Item 4.     Purpose of Transaction

???? The Reporting Persons acquired the securities of the Issuer reported
herein based on their belief that the securities were undervalued and
represented an attractive investment opportunity.

???? The Reporting Persons have had and anticipate having further discussions
with officers and directors of the Issuer in connection with the Reporting
Persons? investment in the Issuer. The topics of these conversations will
cover a range of issues, including those relating to the business of the
Issuer, management, board composition (which may include whether it makes
sense for a ValueAct Capital employee to be on the Issuer's board of
directors), operations, capital allocation, asset allocation, capitalization,
dividend policy, financial condition, mergers and acquisitions strategy,
overall business strategy, executive compensation, and corporate governance.
The Reporting Persons may also have similar conversations with other
stockholders or other interested parties, such as industry analysts, existing
or potential strategic partners or competitors, investment professionals, and
other investors. The Reporting Persons may at any time reconsider and change
their intentions relating to the foregoing.

???? The Reporting Persons may also take one or more of the actions
described in subsections (a) through (j) of Item 4 of Schedule 13D and may
discuss such actions with the Issuer's management and the board of directors,
other stockholders of the Issuer, and other interested parties, such as those
set out above.

???? The Reporting Persons intend to review their investments in the Issuer
on a continuing basis. Depending on various factors, including, without
limitation, the Issuer's financial position and strategic direction, the
outcome of the discussions and actions referenced above, actions taken by the
Issuer's board of directors, price levels of the Common Stock, other
investment opportunities available to the Reporting Persons, conditions in
the securities market and general economic and industry conditions, the
Reporting Persons may in the future take actions with respect to its
investment position in the Issuer as it deems appropriate, including, without
limitation, purchasing additional Common Stock or other instruments that are
based upon or relate to the value of the Common Stock or the Issuer in the
open market or otherwise, selling some of all of its securities of interests
held by the Reporting Persons, and/or engaging in hedging or similar
transactions with respect to the Common Stock.

Item 5.    Interest in Securities of the Issuer

     (a) and (b).  Set forth below is the beneficial ownership of shares of
Common Stock of the Issuer for each person named in Item 2.  Shares reported
as beneficially owned by ValueAct Master Fund are also reported as
beneficially owned by (i) ValueAct Management L.P. as the manager of each
such investment partnership, (ii) ValueAct Management LLC, as General Partner
of ValueAct Management L.P., (iii) ValueAct Holdings, as the sole owner of
the limited partnership interests of ValueAct Management L.P. and the
membership interests of ValueAct Management LLC and as the majority owner of
the membership interests of VA Partners I and (iv) ValueAct Holdings GP, as
General Partner of ValueAct Holdings.  Shares reported as beneficially owned
by ValueAct Master Fund are also reported as beneficially owned by VA

--------------------------                          -------------------------
CUSIP NO. 09075E100                                             Page 10 of 15
-----------------------------------------------------------------------------

Partners I, as General Partner of ValueAct Master Fund.  VA Partners I,
ValueAct Management L.P., ValueAct Management LLC, ValueAct Holdings and
ValueAct Holdings GP also, directly or indirectly, may own interests in one
or more than one of the partnerships from time to time.  Unless otherwise
indicated below, by reason of such relationship ValueAct Master Fund is
reported as having shared power to vote or to direct the vote, and shared
power to dispose or direct the disposition of, such shares of Common Stock,
with VA Partners I (only with respect to ValueAct Master Fund), ValueAct
Management L.P., ValueAct Management LLC, ValueAct Holdings and ValueAct
Holdings GP.

     As of the date hereof, ValueAct Master Fund is the beneficial owner of
7,700,000 shares of Common Stock, representing approximately 7.1% of the
Issuer's outstanding Common Stock (which shares may also be deemed to be
beneficially owned by VA Partners I).

     ValueAct Management L.P., ValueAct Management LLC, ValueAct Holdings
and ValueAct Holdings GP may each be deemed the beneficial owner of an
aggregate of 7,700,000 shares of Common Stock, representing approximately
7.1% of the Issuer's outstanding Common Stock.  All percentages set forth in
this Schedule 13D are based upon a total of 107,975,968 outstanding shares of
Common Stock (based on disclosure in Biogen Inc.?s Form 4 Statement of
Changes in Beneficial Ownership in the Issuer filed with the SEC on February
1, 2017).

     (c) The following table sets forth all transactions with respect to
shares of Common Stock effected in the previous sixty days by the Reporting
Persons, inclusive of any transactions effected through 4:00 p.m., New York
City time, on February 16, 2017. The Reporting Persons undertake to provide
to the Staff of the Commission, upon request, full information regarding the
number of shares transacted at each price for each such dated. Except as
otherwise noted below, all such transactions were purchases (or sales) of
shares of Common Stock effected in the open market.

Reporting Person        Trade Date    Buy/Sell    Bought(Sold)   Price/Share
----------------        ----------    --------   ------------     -----------
ValueAct Master Fund    01/12/2017      Buy            10,000       $40.00
                        01/17/2017      Buy           484,300       $44.90(1)
                        01/18/2017      Buy         1,150,000       $44.25

(1)   Weighted-average price at which shares were purchased (sold) on the
      listed date between the range of $44.46 and $45.00 per share.


     Additionally, ValueAct Master Fund, one of the Reporting Persons, has
entered into a Master Confirmation in respect of Equity Forward Transactions
(the "Master Confirmation") with unaffiliated third party financial
institution counterparties (the "Counterparty") relating to shares of the
Common Stock of the Issuer and entered into forward transactions thereunder
(the "Forward Transactions") on the dates and in the notional share amounts
(the "Number of Forward Shares") as set forth in the table below, all as more
fully described in Item 6 below. The Master Confirmation is subject to the
terms of an ISDA Master Agreement, Schedule and Credit Support Annex already
in place between ValueAct Master Fund and the Counterparty.


--------------------------                          -------------------------
CUSIP NO. 09075E100                                             Page 11 of 15
-----------------------------------------------------------------------------
                                              Number of
                                              Forward             Forward
Reporting Person        Trade Date            Shares              Price
----------------        ----------            ---------           -------
ValueAct Master Fund    01/19/2017             181,859             $43.94
                        01/20/2017             690,000             $43.75
                        01/23/2017             420,000             $42.24
                        01/25/2017              27,994             $42.10
                        01/26/2017               7,100             $43.42
                        01/30/2017              88,538             $44.00
                        01/31/2017              22,501             $44.00
                        02/01/2017             250,000             $44.90
                        02/02/2017           1,528,000             $44.41
                        02/06/2017             739,708             $43.06
                        02/07/2017             161,827             $43.81
                        02/08/2017             813,173             $42.85
                        02/09/2017             850,000             $42.27
                        02/10/2017             275,000             $42.88


       (d) and (e)  Not applicable.

Item 6.     Contracts, Arrangements, Understandings or Relationships with
              Respect to Securities of the Issuer

     ValueAct Master Fund entered into the Master Confirmation and the
Forward Transactions in accordance with the trade details set forth in Item 5
(c) hereto.

     Pursuant to each Forward Transaction, ValueAct Master Fund will be
obligated either to (i) purchase from the Counterparty, on the Settlement
Date of June 30, 2017 (or earlier if such Forward Transaction is terminated
early in accordance with its terms), the Number of Forward Shares with
respect to such Forward Transaction (or the applicable portion thereof to
which any such early termination applies) at a price equal to the Forward
Price, as set forth in Item 5 (c) hereto ("Physical Settlement"), or (ii) pay
to the Counterparty the product of (x) the Number of Forward Shares
multiplied by (y) the Forward Price minus the arithmetic mean of the volume-
weighted average price per share for each trading day during a period (the
length of which period shall be the number of trading days over which one-
fifth of the average daily trading volume for the 60 consecutive calendar
days immediately preceding the Valuation Date would aggregate to the Number
of Forward Shares) following the Valuation Date of June 30, 2017 (or earlier
if such Forward Transaction is terminated early in accordance with its
terms), if such amount is positive, or receive from the Counterparty the
absolute value of such amount if such amount is negative ("Cash Settlement").

     A financing charge based on a spread over LIBOR will be added to the
amount, if any, owing by ValueAct Master Fund to the Counterparty pursuant to
Cash Settlement or Physical Settlement or subtracted from the amount, if any,
owing by the Counterparty to ValueAct Master Fund pursuant to Cash
Settlement, and an amount equal to the value of any dividends paid in respect
of the Number of Forward Shares for which the record date occurs during the
term of the applicable Forward Transaction will be subtracted from the
amount, if any, owing by ValueAct Master Fund to the Counterparty pursuant to


--------------------------                          -------------------------
CUSIP NO. 09075E100                                             Page 12 of 15
-----------------------------------------------------------------------------

Cash Settlement or Physical Settlement or added to the amount, if any, owing
by the Counterparty to ValueAct Master Fund pursuant to Cash Settlement.

     Under the terms of the Master Confirmation, ValueAct Master Fund shall
have the option to elect Physical Settlement or Cash Settlement for the
Forward Transactions, but Physical Settlement, which is the default
settlement method, shall only be available if the receipt of such shares by
ValueAct Master Fund would not violate the Hart-Scott-Rodino Antitrust
Improvements Act of 1976, as amended (the "HSR Condition").  If, on the
Settlement Date, the HSR Condition is not satisfied and ValueAct Master Fund
has not elected Cash Settlement, the Settlement Date automatically will be
postponed until the HSR Condition is satisfied.

     ValueAct Master Fund has the right to elect early termination of the
Forward Transactions, in whole or in part, at any time in accordance with the
Master Confirmation, and the Counterparty has the right to elect early
termination of the Forward Transactions, in whole or in part, upon 90
calendar days' prior written notice to ValueAct Master Fund.

     The Forward Transactions do not give the Reporting Persons direct or
indirect voting, investment or dispositive control over any securities of the
Issuer and do not require the Counterparty to acquire, hold, vote or dispose
of any securities of the Issuer. Accordingly, the Reporting Persons disclaim
any beneficial ownership of any shares of Common Stock that may be referenced
in such contracts and of any shares of Common Stock or other securities or
financial instruments that may be held from time to time by the Counterparty.

     The Reporting Persons may, from time to time, enter into and dispose of
swaps, options or other derivative transactions with one or more
counterparties that are based upon the value of shares of the Common Stock,
which transactions may be significant in amount. The profit, loss and/or
return on such contracts may be wholly or partially dependent on the market
value of the shares of the Common Stock.

     Other than as described in this Report and as previously reported, the
Reporting Persons have no understandings, arrangements, relationships or
contracts relating to the Issuer's Common Stock which are required to be
described hereunder.

Item 7.     Material to Be Filed as Exhibits

(1)	Joint Filing Agreement.














--------------------------                          -------------------------
CUSIP NO. 09075E100                                             Page 13 of 15
-----------------------------------------------------------------------------
                                  SIGNATURE
     After reasonable inquiry and to the best of his knowledge and belief,
the undersigned certifies that the information set forth in this statement is
true, complete and correct.

                              POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears
below on this Schedule 13D hereby constitutes and appoints Jeffrey W. Ubben,
Bradley E. Singer, G. Mason Morfit and Allison Bennington, and each of
them, with full power to act without the other, his or its true and lawful
attorney-in-fact and agent, with full power of substitution and
resubstitution, for him or it and in his or its name, place and stead, in any
and all capacities (until revoked in writing) to sign any and all amendments
to this Schedule 13D, and to file the same, with all exhibits thereto and
other documents in connection therewith, with the Securities and Exchange
Commission, granting unto said attorneys-in-fact and agents, and each of
them, full power and authority to do and perform each and every act and thing
requisite and necessary fully to all intents and purposes as he or it might
or could do in person, thereby ratifying and confirming all that said
attorneys-in-fact and agents or any of them, or their or his substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.

                              ValueAct Capital Master Fund L.P., by
                              VA Partners I, LLC, its General Partner

                              By:     /s/  Bradley E. Singer
                                --------------------------------------
Dated: February 16, 2017      Bradley E. Singer, Chief Operating Officer

                              VA Partners I, LLC

                              By:    /s/  Bradley E. Singer
                                --------------------------------------
Dated: February 16, 2017      Bradley E. Singer, Chief Operating Officer

                              ValueAct Capital Management, L.P., by
                              ValueAct Capital Management, LLC its
                              General Partner


                              By:    /s/  Bradley E. Singer
                                --------------------------------------
Dated: February 16, 2017      Bradley E. Singer, Chief Operating Officer


                              ValueAct Capital Management, LLC

                              By:    /s/  Bradley E. Singer
                                --------------------------------------
Dated: February 16, 2017      Bradley E. Singer, Chief Operating Officer




--------------------------                          -------------------------
CUSIP NO. 09075E100                                             Page 14 of 15
-----------------------------------------------------------------------------

                              ValueAct Holdings, L.P., by
                              ValueAct Holdings GP, LLC, its
                              General Partner

                              By:    /s/  Bradley E. Singer
                                --------------------------------------
Dated: February 16, 2017      Bradley E. Singer, Chief Operating Officer


                              ValueAct Holdings GP, LLC

                              By:    /s/  Bradley E. Singer
                                --------------------------------------
Dated: February 16, 2017      Bradley E. Singer, Chief Operating Officer






--------------------------                          -------------------------
CUSIP NO. 09075E100                                             Page 15 of 15
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                                 Exhibit 1

                           JOINT FILING UNDERTAKING

The undersigned parties hereby agree that the Schedule 13D filed herewith
(and any amendments thereto) relating to the Common Stock of Bioverativ Inc.,
is being filed jointly on behalf of each of them with the Securities and
Exchange Commission pursuant to Section 13(d) of the Securities Exchange Act
of 1934, as amended.

                              ValueAct Capital Master Fund L.P., by
                              VA Partners I, LLC, its General Partner

                              By:     /s/  Bradley E. Singer
                                --------------------------------------
Dated: February 16, 2017      Bradley E. Singer, Chief Operating Officer

                              VA Partners I, LLC

                              By:    /s/  Bradley E. Singer
                                --------------------------------------
Dated: February 16, 2017      Bradley E. Singer, Chief Operating Officer


                              ValueAct Capital Management, L.P., by
                              ValueAct Capital Management, LLC its
                              General Partner

                              By:    /s/  Bradley E. Singer
                                --------------------------------------
Dated: February 16, 2017      Bradley E. Singer, Chief Operating Officer


                              ValueAct Capital Management, LLC

                              By:    /s/  Bradley E. Singer
                                --------------------------------------
Dated: February 16, 2017      Bradley E. Singer, Chief Operating Officer


                              ValueAct Holdings, L.P., by
                              ValueAct Holdings GP, LLC, its
                              General Partner

                              By:    /s/  Bradley E. Singer
                                --------------------------------------
Dated: February 16, 2017      Bradley E. Singer, Chief Operating Officer


                              ValueAct Holdings GP, LLC

                              By:    /s/  Bradley E. Singer
                                --------------------------------------
Dated: February 16, 2017      Bradley E. Singer, Chief Operating Officer