Exhibit 99.1

Contact:

Brett Perryman

ir@omam.com

(617) 369-7300

OMAM Reports Financial and Operating Results for the

Third Quarter Ended September 30, 2014

·                  Economic net income of $37.6 million ($0.31 per share) for the quarter, up 19% from the comparative quarter in 2013

·                  Nine month economic net income of $104.3 million ($0.87 per share), up 16% from the comparative period in 2013

·                  U.S. GAAP earnings of ($1.7) million for the quarter and $17.4 million for the nine months ended September 30, 2014

·                  AUM of $214 billion at September 30, 2014, up 16% from September 30, 2013

·                  Net client cash flows of $3.1 billion for the quarter and $5.7 billion for the year-to-date

·                  Partial exercise of IPO Green Shoe for 2,231,375 shares

London — November 5, 2014 — OM Asset Management plc (NYSE: OMAM) today reports its results for the third quarter and nine months ended September 30, 2014.

“Our Affiliates — and our business more broadly — generated strong results in a volatile equity market during the third quarter,” said Peter L. Bain, President and Chief Executive Officer of OMAM.  “Led by a 21% increase in average assets under management, ENI Revenue increased 23%, to $159 million, and pre-tax economic net income grew 23%, to $49.5 million, in the third quarter of 2014 compared to the third quarter of 2013.  Likewise, our ENI operating margin before Affiliate key employee distributions increased from 36% to 38% during this period.

“Our investment products continue to outperform their benchmarks across a range of asset classes and investment styles.  On a revenue-weighted basis, approximately 66%, 70%, and 81% of our products are outperforming their benchmarks over a 1-, 3- and 5-year period, respectively.  During the quarter, our emerging markets and global equities products performed particularly well, and also continue to attract significant net client cash flows. Our third quarter net client cash flows of $3.1 billion generated annualized revenue impact of $19.1 million, the highest level in the last eleven quarters.”

Mr. Bain continued, “With interests aligned through equity ownership and profit sharing with our Affiliates, we are true partners in identifying and executing upon opportunities to accelerate the growth of our Affiliates’ businesses.  We continue to make excellent progress in our collaborative growth initiatives, with approximately $1.0 billion in gross client cash flows in the quarter into products supported by our seed or growth capital initiatives.  In addition, our Global Distribution platform continues to generate strong flows, with $1.8 billion of new fundings during the quarter, and a total of $4.9 billion raised thus far in 2014.  We will also seek growth opportunities through partnerships with at-scale asset management boutiques with strong investment and executive talent and a vision to enhance and expand their businesses in partnership with OMAM.”

Mr. Bain concluded, “We are very pleased to have undertaken our initial public offering on October 8, and the subsequent partial exercise of the Green Shoe.  We remain focused on generating long-term value for our shareholders through the consistent execution of our growth strategy.”

Table 1: Key Performance Metrics (unaudited)

($ in millions, unless otherwise noted)

Please see definitions and additional notes.  Please see Table 12 for a reconciliation of net income attributable to controlling interests to economic net income.

Assets Under Management and Flows

At September 30, 2014, OMAM’s total assets under management (“AUM”) were $213.8 billion, down $1.1 billion or 1% compared to $214.9 billion at June 30, 2014, and up $15.0 billion or 8% compared to $198.8 billion at December 31, 2013.

The decrease in AUM during the three months ended September 30, 2014 reflects net market depreciation of $4.2 billion partially offset by net inflows of $3.1 billion.  The increase in assets during the nine months ended September 30, 2014 reflects net market appreciation of $9.7 billion combined with net inflows of $5.7 billion.

For the three months ended September 30, 2014, OMAM’s net flows were $3.1 billion compared to $3.6 billion for the three months ended June 30, 2014 and $1.0 billion for the three months ended September 30, 2013.  For the three months ended September 30, 2014, the annualized revenue impact of the net flows increased to $19.1 million compared to $18.4 million for the three months ended June 30, 2014 and $5.8 million for the three months ended September 30, 2013, as gross inflows of $8.9 billion in the latest three months were into higher fee asset classes yielding 46 bps.

For the nine months ended September 30, 2014, OMAM’s net flows were $5.7 billion compared to $7.2 billion for the nine months ended September 30, 2013.  However, for the nine months ended September 30, 2014, the annualized revenue impact of the net flows increased to $34.5 million compared to $26.0 million for the nine months ended September 30, 2013, as gross inflows of $22.8 billion in the nine months ended September 30, 2013 yielded 43 bps compared to 38 bps in the year-ago period.

Table 2: Assets Under Management Rollforward Summary

($ in billions, unless otherwise noted)

Please see definitions and additional notes

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Balance Sheet and Capital Management

Selected Balance Sheet information as of September 30, 2014 and December 31, 2013 is provided in Table 3 below, both on a U.S. GAAP basis, which includes Consolidated Funds, and on a non-GAAP basis which excludes those elements of Consolidated Funds which are not economically attributable to OMAM shareholders. In connection with the Company’s initial public offering, a Reorganization of the Company occurred, described more fully in the Company’s Prospectus dated October 8, 2014. While certain steps in this Reorganization had been completed by September 30, 2014 and are reflected in the information, some steps in the Reorganization had not occurred. Pro forma non-GAAP Balance Sheet information has been provided which reflects these additional steps in the Reorganization, completed at the closing of the IPO, as if they had been completed as of September 30, 2014. The primary changes which have been reflected are i) the drawdown of $177 million on the Company’s $350 million revolving credit facility, primarily to fund a $175 million IPO-related dividend to the Parent and ii) completion of the $60 million purchase of additional ownership interests in an Affiliate.

On a pro forma basis, as of September 30, 2014, the Company had long term debt of $177 million and shareholders’ equity of ($9.1) million. The Company’s pro-forma ratio of third party borrowings to trailing twelve months Adjusted EBITDA was 1.0x, well below the maximum 3.0x leverage covenant under OMAM’s revolving credit facility.

As of September 30, 2014, the Company was using (or had committed to use) approximately $147 million of seed capital, provided by the Parent, to invest in products managed by OMAM’s Affiliates. This seed capital is not on the balance sheet of OMAM, as it is directly owned by a subsidiary of the Parent. In addition, at September 30, 2014, the Company had $48.5 million of co-investments in funds managed by its Affiliates on its balance sheet, with an off-setting liability to reflect the economic ownership of these investments by the Parent. The Prospectus describes in more detail the arrangements with Old Mutual plc with respect to seed capital and co-investments.

The Company expects to declare and pay its first quarterly dividend as a public company, with respect to earnings for the fourth quarter of 2014, in the first quarter of 2015.

Table 3: Selected Balance Sheet Information

($ in millions)

Please see definitions and additional notes

Financial Results: Non-GAAP Economic Net Income

For the three months and nine months ended September 30, 2014, pro forma basic and fully diluted economic net income per share was $0.31 and $0.87, respectively. For the three months ended September 30, 2014 and 2013, economic net income was $37.6 million and $31.7 million, respectively, an increase of $5.9 million, or 19%.  For the nine months ended September 30, 2014 and 2013, economic net income was $104.3 million and $90.1 million, respectively, an increase of $14.2 million, or 16%.  See Table 4 for a summary of economic net income and Table 12 for a reconciliation of economic net income to U.S. GAAP.

For the three months ended September 30, 2014, compared to the three months ended September 30, 2013, ENI Revenue increased 23%, from $129.4 million to $159.0 million, driven primarily by increases in management fees as average assets under management excluding equity accounted Affiliates increased 22%. Operating expenses before commissions increased 14% quarter-over-quarter (including commissions, total operating expenses grew 17% to $54.7 million). In addition to operating expenses, scale benefits were realized in variable compensation. While total variable compensation grew 21% quarter-over-quarter to $43.7 million, the ratio of variable compensation to earnings before variable compensation fell from 44% to 42%. The lower growth rate of expenses relative to revenue resulted in an increase in OMAM’s ENI operating margin before Affiliate key employee distributions from 36% to 38%. Affiliate key employee distributions increased 68% quarter-over-quarter to $11.1 million as a result of higher levels of Affiliate

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earnings combined with additional Affiliate ownership of their businesses and the leverage impact of OMAM’s earnings preference on the level of employee distributions.

For the three months ended September 30, 2014, Adjusted EBITDA was $51.1 million, compared to $41.3 million for the same period of 2013. See Table 13 for a reconciliation of economic net income to Adjusted EBITDA.

For the nine months ended September 30, 2014, compared to the nine months ended September 30, 2013, ENI Revenue increased 18%, from $381.5 million to $451.0 million, driven primarily by increases in management fees, as average assets under management excluding equity accounted Affiliates increased 22%.  Performance fees fell from $10.8 million for the nine months ended September 30, 2013, to $5.3 million for the nine months ended September 30, 2014.  Operating expenses before commissions increased 12% period-over-period (including commissions, total operating expenses grew 14% to $157.7 million).  Total variable compensation grew 11% period-over-period to $123.9 million, while the ratio of variable compensation to earnings before variable compensation fell from 46% to 42%.  OMAM’s ENI operating margin before Affiliate key employee distributions increased from 35% to 38% as a result of margin increases at the Affiliates and scale benefits at the holding company.  Affiliate key employee distributions increased 56% period-over-period to $28.7 million as a result of higher levels of Affiliate earnings combined with additional Affiliate ownership of their businesses and the leverage impact of OMAM’s earnings preference on the level of employee distributions.

For the nine months ended September 30, 2014, Adjusted EBITDA was $145.2 million, compared to $117.5 million for the same period of 2013.  See Table 13 for a reconciliation of economic net income to Adjusted EBITDA.

Table 4: Economic Net Income (Non-GAAP measure)

($ in millions, except per share data)

Please see definitions and additional notes

Financial Results: U.S. GAAP

For the three months and nine months ended September 30, 2014, pro forma basic and fully diluted earnings per share was ($0.01) and $0.15, respectively. For the three months ended September 30, 2014 and 2013, net income (loss) attributable to controlling interests was ($1.7) million and $6.9 million, respectively.  For the nine months ended September 30, 2014 and 2013, net income attributable to controlling interests was $17.4 million and $18.6 million, respectively, a decrease of 6%.  See Table 5 for the Company’s U.S. GAAP Statement of Operations.

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Table 5: U.S. GAAP Statement of Operations

($ in millions)

Please see definitions and additional notes

Recent Events

The underwriters in the initial public offering of OMAM have exercised a portion of their overallotment option and purchased an additional 2,231,375 shares of OMAM at the IPO price of $14.00 per share.  The exercise of the option has no financial impact on OMAM.  The net proceeds from the exercise go to the Parent and will increase the public and employee ownership of OMAM to 21.2%.  The transfer and sale of the shares pursuant to the exercise of the overallotment closed on October 24.

About OMAM

OMAM is a global, multi-boutique asset management company with approximately $214 billion of assets under management as of September 30, 2014 which operates through a diverse portfolio of asset management firms that serve institutional investors around the world.  OMAM’s partnership approach, which includes equity ownership at the Affiliate level and a profit sharing relationship between OMAM and its Affiliates, aligns the interests of the Company and its Affiliates to work collaboratively in accelerating their growth.  OMAM’s business model combines the investment talent, entrepreneurialism, focus and creativity of leading asset management boutiques with the resources and capabilities of a larger firm.  For more information about OMAM, please visit the Company’s website at www.omam.com.

Forward Looking Statements

This press release includes forward-looking statements, as that term is used in the Private Securities Litigation Reform Act of 1995, including information relating to anticipated growth in revenues, margins or earnings, anticipated changes in the Company’s business, anticipated future performance of the Company’s business, anticipated future investment performance of the Company’s Affiliates, expected future net cash flows, anticipated expense levels, changes in expense, the expected effects of acquisitions and expectations regarding market conditions.  The words or phrases ‘‘will likely result,’’ ‘‘are expected to,’’ ‘‘will continue,’’ ‘‘is anticipated,’’ ‘‘can be,’’ ‘‘may be,’’ ‘‘aim to,’’ ‘‘may affect,’’ ‘‘may depend,’’ ‘‘intends,’’ ‘‘expects,’’ ‘‘believes,’’ ‘‘estimate,’’ ‘‘project,’’ and other similar expressions are intended to identify such forward-looking statements. Such statements are subject to various known and

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unknown risks and uncertainties and readers should be cautioned that any forward-looking information provided by or on behalf of the Company is not a guarantee of future performance.

Actual results may differ materially from those in forward-looking information as a result of various factors, some of which are beyond the Company’s control, including but not limited to those discussed above and elsewhere in this press release and in the Prospectus filed with the Securities and Exchange Commission on October 9, 2014. Due to such risks and uncertainties and other factors, the Company cautions each person receiving such forward-looking information not to place undue reliance on such statements. Further, such forward-looking statements speak only as of the date of this press release and the Company undertakes no obligations to update any forward looking statement to reflect events or circumstances after the date of this press release or to reflect the occurrence of unanticipated events.

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Financial Tables

Table 6: Condensed and Consolidated Balance Sheets

($ in millions)

Please see definitions and additional notes

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Table 7: Assets Under Management Rollforward by Asset Class

($ in billions)