FORM 4
[ X ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

TCI Fund Management Ltd 		2. Issuer Name and Ticker or Trading Symbol

ALTABA INC. [ AABA ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      __ X __ 10% Owner
_____ Officer (give title below)      _____ Other (specify below)
(Last)          (First)          (Middle)

7 CLIFFORD STREET,  		3. Date of Earliest Transaction (MM/DD/YYYY)

1/18/2018
(Street)

LONDON, X0 W1S2FT
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

___ Form filed by One Reporting Person
_ X _ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock, par value $0.001 per share ("Shares")   1/18/2018     S    750000   D $74.2795   (2) 85173952   I   See Footnote   (1)
Shares   1/19/2018     S    464000   D $74.0791   (3) 84709952   I   See Footnote   (1)

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Explanation of Responses:
(1)  The securities reported herein are held by The Children's Investment Master Fund, a Cayman Islands exempted company (the "TCI Fund") and Talos Capital DAC, a private limited company incorporated under the laws of Ireland ("Talos"). TCI Fund Management Limited, a United Kingdom private limited company ("TCIF UK") is the investment manager of both TCI Fund and Talos. Christopher Hohn is the Managing Director of TCIF UK. The filing of this statement should not be construed as an admission that any of the Reporting Persons is, for the purposes of Sections 16 of the Securities Exchange Act of 1934 or otherwise, the beneficial owner of the securities reported herein. Each of the Reporting Persons disclaims beneficial ownership of the securities listed herein, except to the extent of its respective pecuniary interest therein.
(2)  The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $73.85 to $74.71 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the range set forth herein.
(3)  The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $73.71 to $74.63 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the range set forth herein.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
TCI Fund Management Ltd
7 CLIFFORD STREET
LONDON, X0 W1S2FT
X

HOHN CHRISTOPHER
C/O TCI FUND MANAGEMENT LIMITED
7 CLIFFORD ST
LONDON, X0 W1S 2FT
X


Signatures
TCI Fund Management Limited, By: /s/ Christopher Hohn, Managing Director 1/22/2018
** Signature of Reporting Person Date

/s/ Christopher Hohn 1/22/2018
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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