SemGroup Announces Plan to Pay a Cash Dividend

SemGroup Announces Plan to Pay a Cash Dividend

TULSA, Okla., Jan. 9, 2013 (GLOBE NEWSWIRE) -- SemGroup Corporation
(NYSE:SEMG) (SemGroup) today announced that it expects to pay a quarterly cash
dividend to common shareholders beginning in the second quarter of 2013. The
dividend is targeted to represent a pass-through of the majority of the cash
distributions received by SemGroup from its interests in Rose Rock Midstream,
L.P. (NYSE:RRMS) and NGL Energy Partners LP (NYSE:NGL).

The dividend is expected to be based on the previous quarter's distributions
received from SemGroup's interests in these master limited partnerships
(MLPs). Accordingly, the initial dividend, to be declared and paid in the
second quarter of 2013, is anticipated to be based on the distributions
received by SemGroup from Rose Rock Midstream and NGL Energy Partners in the
first quarter of the year.

"In the past three years, since becoming a public company, we undertook a
number of initiatives to improve the stability of our cash flows and to
position the company to benefit from the significant growth potential in the
midstream oil and gas sector. Our intention to initiate a cash dividend
reflects our confidence in our future cash flows. It is another important step
in our commitment to deliver value to shareholders," said Norm Szydlowski,
president and chief executive officer of SemGroup. "As we receive additional
cash distributions from our MLP investments, we anticipate increasing the
SemGroup dividend," Szydlowski added.

About SemGroup

Based in Tulsa, OK, SemGroup® Corporation (NYSE:SEMG) is a publicly traded
midstream service company providing the energy industry the means to move
products from the wellhead to the wholesale marketplace. SemGroup provides
diversified services for end-users and consumers of crude oil, natural gas,
natural gas liquids, refined products and asphalt. Services include
purchasing, selling, processing, transporting, terminalling and storing
energy.

The SemGroup Corporation logo is available at
http://www.globenewswire.com/newsroom/prs/?pkgid=14815

Forward-Looking Statements

Certain matters contained in this Press Release include "forward-looking
statements" within the meaning of Section 27A of the Securities Act of 1933,
as amended, and Section 21E of the Securities Exchange Act of 1934, as
amended. We make these forward-looking statements in reliance on the safe
harbor protections provided under the Private Securities Litigation Reform Act
of 1995.

All statements, other than statements of historical fact, included in this
Press Release including our intention to initiate a cash dividend, possible
increases in such a dividend, the prospects of our industry, our anticipated
financial performance, NGL Energy Partners LP and Rose Rock Midstream, L.P.
anticipated financial performance, management's plans and objectives for
future operations, business prospects, market conditions and other matters,
may constitute forward-looking statements. Although we believe that the
expectations reflected in these forward-looking statements are reasonable, we
cannot assure you that these expectations will prove to be correct. These
forward-looking statements are subject to certain known and unknown risks and
uncertainties, as well as assumptions that could cause actual results to
differ materially from those reflected in these forward-looking statements.
Factors that might cause actual results to differ include, but are not limited
to, our ability to comply with the covenants contained in and maintain certain
financial ratios required by our credit facilities; NGL's operations, which we
do not control; the ability of our subsidiary, Rose Rock Midstream L.P., to
make minimum quarterly distributions; the possibility that our hedging
activities may result in losses or may have a negative impact on our financial
results; any sustained reduction in demand for the petroleum products we
gather, transport, process and store; our ability to obtain new sources of
supply of petroleum products; our failure to comply with new or existing
environmental laws or regulations or cross border laws or regulations; the
possibility that the construction or acquisition of new assets may not result
in the corresponding anticipated revenue increases; any future impairment to
goodwill resulting from the loss of customers or business; changes in currency
exchange rates; and the risks and uncertainties of doing business outside of
the U.S., including political and economic instability and changes in local
governmental laws, regulations and policies, as well as other risk factors
discussed from time to time in each of our documents and reports filed with
the SEC.

Readers are cautioned not to place undue reliance on any forward-looking
statements contained in this Press Release, which reflect management's
opinions only as of the date hereof. Except as required by law, we undertake
no obligation to revise or publicly release the results of any revision to any
forward-looking statements.

CONTACT: Investor Relations:
         Alisa Perkins, 918-524-8081
         investor.relations@semgroupcorp.com
        
         Media:
         Liz Barclay, 918-524-8158
         lbarclay@semgroupcorp.com

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