YIT - Prospectus/Announcement of Prospectus

YIT Corporation: Supplement to the Merger Prospectus

YIT Corporation Stock Exchange Release September 7, 2017 at 3:30 p.m.
This stock exchange release may not be published or distributed, in whole or in
part, directly or indirectly, in or into Canada, Australia, Hong Kong, South
Africa, Japan or any other country where such publication or distribution would
violate applicable laws or rules or would require additional documents to be
completed or registered or require any measure to be undertaken, in addition to
the requirements under Finnish law. For further information see "Important
notice" below.

YIT Corporation ("YIT") has supplemented the merger prospectus dated 24 August
2017 concerning the proposed merger of Lemminkäinen Corporation ("Lemminkäinen")
into YIT. The Finnish Financial Supervisory Authority has on September 7, 2017
approved the supplement to the Finnish language merger prospectus. The
supplement relates to the Supreme Court’s announcement that it has granted
partial leave to appeal to Lemminkäinen and the city of Vantaa regarding the
legal proceedings concerning the damages related to the asphalt cartel. The
supplement is annexed to this release.

The Finnish language merger prospectus and the English language offering
circular and the related supplements are available at
www.lemminkainen.com/merger and at www.yitgroup.com/en/investors/merger and are
also available as printed copies at the offices of Lemminkäinen at
Salmisaarenaukio 2, FI-00180 Helsinki, Finland, at the offices of YIT at
Panuntie 11, FI-00620 Helsinki, Finland and at the reception of Nasdaq Helsinki
Ltd. at Fabianinkatu 14, FI-00100 Helsinki, Finland.

YIT Corporation

Additional information:

Esa Neuvonen
Chief Financial Officer
tel. +358 40 500 1003
esa.neuvonen@yit.fi

Hanna Jaakkola

Vice President, Investor Relations

tel. +358 5666 070

hanna.jaakkola@yit.fi

Hanna Malmivaara

Vice President, Communications of YIT

tel. +358 40 561 6568

hanna.malmivaara@yit.fi

YIT Press Desk

tel. +358 44 743 7536

press@yit.fi

Distribution: Nasdaq Helsinki Ltd., major media, www.yitgroup.com

YIT creates better living environment by developing and constructing housing,
business premises, infrastructure and entire areas. Our vision is to bring more
life in sustainable cities. We want to focus on caring for customer, visionary
urban development, passionate execution and inspiring leadership. Our growth
engine is urban development involving partners. Our operating area covers
Finland, Russia, the Baltic countries, the Czech Republic, Slovakia and Poland.
In 2016, our revenue amounted to nearly EUR 1.8 billion, and we employ about
5,300 employees. Our share is listed on Nasdaq Helsinki. www.yitgroup.com

IMPORTANT NOTICE

The distribution of this release may be restricted by law and persons into whose
possession any document or other information referred to herein comes should
inform themselves about and observe any such restrictions. The information
contained herein is not for publication or distribution, directly or indirectly,
in or into Canada, Australia, Hong Kong, South Africa or Japan. Any failure to
comply with these restrictions may constitute a violation of the securities laws
of any such jurisdiction. This release is not directed to, and is not intended
for distribution to or use by, any person or entity that is a citizen or
resident or located in any locality, state, country or other jurisdiction where
such distribution, publication, availability or use would be contrary to law or
regulation or which would require any registration or licensing within such
jurisdiction.

This release does not constitute a notice to an EGM or a merger prospectus and
as such, does not constitute or form part of and should not be construed as, an
offer to sell, or the solicitation or invitation of any offer to buy, acquire or
subscribe for, any securities or an inducement to enter into investment
activity. Any decision with respect to the proposed statutory absorption merger
of Lemminkäinen into YIT should be made solely on the basis of information that
will be contained in the actual notices to the EGM of YIT and Lemminkäinen, as
applicable, and the merger prospectus related to the merger as well as on an
independent analysis of the information contained therein. You should consult
the merger Prospectus for more complete information about YIT, Lemminkäinen,
their respective subsidiaries, their respective securities and the merger.

No part of this release, nor the fact of its distribution, should form the basis
of, or be relied on in connection with, any contract or commitment or investment
decision whatsoever. The information contained in this release has not been
independently verified. No representation, warranty or undertaking, expressed or
implied, is made as to, and no reliance should be placed on, the fairness,
accuracy, completeness or correctness of the information or the opinions
contained herein. Neither YIT nor Lemminkäinen, nor any of their respective
affiliates, advisors or representatives or any other person, shall have any
liability whatsoever (in negligence or otherwise) for any loss however arising
from any use of this release or its contents or otherwise arising in connection
with this release. Each person must rely on their own examination and analysis
of YIT, Lemminkäinen, their respective subsidiaries, their respective securities
and the merger, including the merits and risks involved.

Notice to Lemminkäinen Shareholders in the United States

The YIT shares to be issued in connection with the merger have not been
registered under the U.S. Securities Act of 1933, as amended (the "Securities
Act") and are being issued in reliance on the exemption from registration set
forth in Rule 802 under the Securities Act.

YIT and Lemminkäinen are Finnish companies and the issuance of YIT shares will
be subject to procedural and disclosure requirements in Finland that may be
different from those of the United States. Any financial statements or other
financial information included in this release may have been prepared in
accordance with non-U.S. accounting standards that may not be comparable to the
financial statements of U.S. companies or companies whose financial statements
are prepared in accordance with generally accepted accounting principles in the
United States.

It may be difficult for U.S. shareholders of Lemminkäinen to enforce their
rights and any claims they may have arising under U.S. federal securities laws
in connection with the merger, since YIT and Lemminkäinen are located in non
-U.S. jurisdictions, and some or all of YIT's and Lemminkäinen's officers and
directors may be residents of countries other than the United States. As a
result, U.S. shareholders of Lemminkäinen may not be able to sue YIT or
Lemminkäinen or their respective officers and directors in a court in Finland
for violations of U.S. federal securities laws. Further, it may be difficult to
compel YIT or Lemminkäinen to subject themselves to the jurisdiction or judgment
of a U.S. court.

Lemminkäinen’s shareholders should be aware that YIT may purchase Lemminkäinen’s
shares otherwise than under the merger, such as in open market or privately
negotiated purchases, at any time during the pendency of the proposed merger.

Notice to Shareholders in the United Kingdom

This release, the merger prospectus and the English language offering circular
are for distribution only to persons who (i) have professional experience in
matters relating to investments falling within Article 19(5) of the Financial
Services and Markets Act 2000 (Financial Promotion) Order 2005 (as amended, the
"Financial Promotion Order"), (ii) are persons falling within Article 43 of the
Financial Promotion Order (for example as shareholders in Lemminkäinen entitled
to receive the merger consideration shares pursuant to the Finnish Companies Act
(21.7.2006/624, as amended)), (iii) are persons falling within Article 49(2)(a)
to (d) ("high net worth companies, unincorporated associations etc.") of the
Financial Promotion Order, (iv) are outside the United Kingdom, or (v) are
persons to whom an invitation or inducement to engage in investment activity
(within the meaning of section 21 of the Financial Services and Markets Act
2000) in connection with the issue or sale of the merger consideration shares
may otherwise lawfully be communicated or caused to be communicated (all such
persons together being referred to as "relevant persons"). The release, the
merger prospectus and the English language offering circular are directed only
at relevant persons and must not be acted on or relied on by persons who are not
relevant persons. Any investment or investment activity to which these documents
relate, are available only to relevant persons and will be engaged in only with
relevant persons.

Notice to Shareholders in the European Economic Area

The English language offering circular has been prepared on the basis that any
offer of the merger consideration shares in any Member State of the European
Economic Area ("EEA") other than offers (the "Permitted Public Offers") which
are made prior to the Effective Date (as defined in the English language
offering circular), and which are contemplated in the English language offering
circular in Finland once the Finnish language merger prospectus has been
approved by the competent authority in Finland and published in accordance with
the Prospectus Directive, and in respect of which YIT has consented in writing
to the use of the English language offering circular, will be made pursuant to
an exemption under the Prospectus Directive from the requirement to publish a
prospectus for offers of the merger consideration shares. Accordingly any person
making or intending to make an offer in that Member State of the merger
consideration shares which are the subject of the offer contemplated in the
English language offering circular, other than the Permitted Public Offers, may
only do so in circumstances in which no obligation arises for YIT to publish a
prospectus pursuant to Article 3 of the Prospectus Directive or supplement a
prospectus pursuant to Article 16 of the Prospectus Directive, in each case, in
relation to such offer. YIT has not authorised, nor does it authorise, the
making of any offer (other than Permitted Public Offers) of the merger
consideration shares in circumstances in which an obligation arises for YIT to
publish or supplement a prospectus for such offer.

In relation to each Member State of the EEA, with effect from and including the
date on which the Prospectus Directive was implemented in that Member State (the
"Relevant Implementation Date") no offer has been made and will not be made
(other than a Permitted Public Offer) of the merger consideration shares which
are the subject of the offering contemplated by the English language offering
circular to the public in that Member State, except that, with effect from and
including the Relevant Implementation Date, an offer of such merger
consideration shares is made to the public in that Member State:

a) to any legal entity which is a qualified investor as defined in the
Prospectus Directive;

b) to fewer than 150 natural or legal persons (other than qualified investors as
defined in the Prospectus Directive), as permitted under the Prospectus
Directive, subject to obtaining the prior consent of YIT for any such offer; or

c) in any other circumstances falling within Article 3(2) of the Prospectus
Directive,

provided that no offer of the merger consideration shares is made which would
require YIT to publish a prospectus pursuant to Article 3 of the Prospectus
Directive or supplement a prospectus pursuant to Article 16 of the Prospectus
Directive.

The expression an offer of the merger consideration shares to the public in
relation to any merger consideration shares in any Member State means the
communication in any form and by any means of sufficient information on the
terms of the offer and the merger consideration shares to be offered so as to
enable an investor to decide to purchase or subscribe to the merger
consideration shares, as the same may be varied in that Member State by any
measure implementing the Prospectus Directive in that Member State.

The expression "Prospectus Directive" means Directive 2003/71/EC (as amended),
and includes any relevant implementing measure in the EEA Member State
concerned.

Annex: Supplement to the Offering Circular

Attachments:

Supplement to the Offering Circular ENG.PDF