13D Filing: Silver Lake Partners and Tintri Inc (TNTR)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 1)*

TINTRI, INC.

(Name of Issuer)

Common Stock, $0.00005 par value per share

(Title of Class of Securities)

88770Q105

(CUSIP Number)

Karen M. King, Esq.

Silver Lake

2775 Sand
Hill Road, Suite 100

Menlo Park, CA 94025

(650) 233-8120

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

With copies to:

Daniel N. Webb, Esq.

Simpson Thacher & Bartlett LLP

2475 Hanover Street

Palo
Alto, California 94304

(650) 251-5000

February 27, 2018

(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 §240.13d-7 for other parties to whom copies are to be sent.

The 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, as amended (the Exchange 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).

2

3

4

5

6

Explanatory Note

This Amendment No. 1 (the Amendment) amends the statement on Schedule 13D originally filed by Silver Lake Kraftwerk Fund,
L.P. (SLK), Silver Lake Technology Investors Kraftwerk, L.P. (SLTIK, and together with SLK, the Silver Lake Investors), Silver Lake Technology Associates Kraftwerk, L.P. (SLTA Kraftwerk), SLTA
Kraftwerk (GP), L.L.C. (SLTA GP Kraftwerk), and Silver Lake Group, L.L.C. (SLG, and collectively with the Silver Lake Investors, SLTA Kraftwerk and SLTA GP Kraftwerk, the Reporting Persons) on July 17, 2017
(as amended, the Schedule 13D). The Item below amends the information disclosed under the corresponding Item of the Schedule 13D as described below. Except as specifically provided herein, this Amendment does not modify any of the
information previously reported in the Schedule 13D. Capitalized terms used but not defined herein shall have the meanings attributed to them in the Schedule 13D.

The information set forth in Annex A of the Schedule 13D is hereby amended and
restated as set forth in the Annex A attached to this Amendment.

Item 4 is hereby amended and supplemented by adding the following paragraph
at the end thereof:

The information set forth in Item 6 of this Schedule 13D is incorporated by reference in its entirety into this Item 4.

The information contained in rows 7, 8, 9, 10, 11 and 13 on each
of the cover pages of this Schedule 13D and the information set forth or incorporated in Items 2, 3 and 6 of this Schedule 13D is incorporated by reference in its entirety into this Item 5.

Items 5 (a), (b) and (c) are hereby amended and restated as follows:

(a) (b) By virtue of the relationships and agreements among the Reporting Persons described herein, the Reporting Persons may be deemed to
constitute a group within the meaning of Section 13(d)(3) of the rules and regulations promulgated by the Securities and Exchange Commission (the Commission) pursuant to the Securities Exchange Act of 1934 (the Exchange
Act). As such, the Reporting Persons may be deemed to beneficially own an aggregate of 5,408,450 shares of Common Stock of the Issuer, which includes 5,245,658 shares of Common Stock held by SLK and 162,792 shares of Common Stock held by
SLTIK, representing in the aggregate approximately 17.3% of the issued and outstanding shares of Common Stock of the Issuer.

The percentages of
beneficial ownership in this Schedule 13D are based on 31,324,097 shares of Common Stock outstanding as of December 5, 2017, as reflected in the Issuers Quarterly Report on Form 10-Q which was filed
with the Securities and Exchange Commission on December 14, 2017.

Information with respect to the beneficial ownership of Common Stock by the
individuals listed in Annex A is set forth in Annex A attached hereto and incorporated herein by reference in response to this Item 5.

(c) Except as
set forth in this Amendment, none of the Reporting Persons have effected any transaction in Common Stock in the past 60 days.

Item
6 is hereby amended and supplemented by adding the following paragraphs at the end thereof:

Note Purchase Agreement

As previously disclosed, the Silver Lake Investors are parties to a Note Purchase Agreement dated as of May 4, 2017, as amended by Amendment No. 1 to
the Note Purchase Agreement dated as of July 6, 2017 (the Note Purchase Agreement), with the Issuer and certain other investors of the Issuer.

Pursuant to the Note Purchase Agreement, the Silver Lake Investors agreed to purchase from the Issuer, at the Issuers election, one or more notes having
an aggregate maximum principal amount of $6,231,607.50, in the case of SLK, and $193,392.50, in the case of SLTIK, which, under certain circumstances, would be convertible, at the option of the Issuer, into shares of Common Stock. On
February 27, 2018, the Silver Lake Investors funded $6,231,607.50, in the case of SLK, and $193,392.50, in the case of SLTIK, under the Note Purchase Agreement and were issued notes of the Issuer (the Notes).

The Notes have an interest rate of 8.0% per annum and will mature 540 days from the date of issuance, with accrued interest payable at maturity. Pursuant
to the terms of the Note Purchase Agreement, as the maturity date of such Notes will occur prior to the date at which the Issuer would have been permitted to convert such amounts into Common Stock, such Notes will not be convertible by the Issuer
into Common Stock.

The foregoing description of the Note Purchase Agreement is qualified in its entirety by reference to the Note Purchase Agreement and
Amendment No. 1 to the Note Purchase Agreement which are filed as Exhibits D and E, respectively, to this Schedule 13D and incorporated by reference herein.

Signatures

After reasonable inquiry and to the best of its knowledge and belief, the undersigned certify that the information set forth in this statement is true,
complete and correct.

Dated: March 2, 2018

Annex A

Annex A is hereby amended and restated as follows:

The
following sets forth the name and principal occupation of each of the managing members of Silver Lake Group, L.L.C. Each of such persons is a citizen of the United States.

Silver Lake Group, L.L.C.

None of the persons listed above beneficially owns any Common Stock of the Issuer or has engaged in any transactions in Common
Stock in the previous 60 days.