Investment Performance for INEOS RETIREMENT SAVINGS PLAN

Investment Performance for INEOS RETIREMENT SAVINGS PLAN 6-14398 Investment results shown represent historical performance and do not guarantee future results. Investment returns and principal values fluctuate with changes in interest rates and other market conditions so the value, when redeemed may be worth more or less than original costs. Current performance may be lower or higher than the performance data shown. The gross total investment expense figure does not reflect any waivers or caps on the mutual fund or underlying mutual fund in which a Separate Account invests. Returns displayed are always based on net total investment expense. For more performance information, including most recent month-end performance, visit www.principal.com, contact your representative of the Principal Financial Group (The Principal ), or call our Client Contact Center at 1-800-547-7754. Investment Advisor Investment Option YTD 1 yr. 3 yr. 5 yr. 10 yr. Large U.S. Equity Large Value Average Annual Total Returns through 09/30/2011 Percentile Rankings as of 09/30/2011 Since Inception Inception Date YTD 1 yr. 3 yr. 5 yr. 10 yr. American Beacon American Beacon Large-Cap Value Institutional Fund -12.97-4.14-0.08-3.17 4.49 8.05 07/17/1987-66 37 54 15 0.60 AADEX Dodge & Cox Dodge & Cox Stock Fund -13.72-4.08-0.49-4.91 4.14 10.32 01/04/1965-65 44 80 21 0.52 DODGX Russell 1000 Value Index -11.24-1.89-1.52-3.53 3.36 - - - - - - - Total Inv. Expense Gross Morningstar Category Average - Large Value -11.38-2.41-0.67-2.90 2.98 Total Funds in Category 1257 1238 1114 964 545 - - Large Blend Principal Global Investors LargeCap S&P 500 Index Separate Account-I5 A, 2, 6-8.70 1.08 1.18-1.21 2.76 7.68 01/01/1990-18 28 33 38 0.06 - Thornburg Mutual Funds Thornburg Value R5 Fund 25-17.98-8.70 0.71-2.41 2.80 1.71 02/01/2005-96 42 69 36 1.12 TVRRX Russell 1000 Index -9.25 0.91 1.61-0.91 3.28 - - - - - - - Standard & Poor's 500 Index -8.68 1.14 1.23-1.18 2.82 - - - - - - - Morningstar Category Average - Large Blend -11.24-1.79 0.29-1.81 2.56 Total Funds in Category 1895 1883 1652 1408 832 - - Large Growth Capital Research and Mgmt Co American Funds Growth Fund of America R6 Fund 25-12.12-3.05 0.86-0.81 4.53 10.08 05/01/2009-74 68 66 17 0.34 RGAGX Columbus Circle Investors LargeCap Growth Separate Account-I5 A -11.53-0.74-0.20 0.20 2.87 5.43 06/01/1995-54 81 46 43 0.35 - Russell 1000 Growth Index -7.20 3.78 4.69 1.62 3.01 - - - - - - - Morningstar Category Average - Large Growth -10.80-0.42 2.44 0.15 2.79 Total Funds in Category 1684 1671 1479 1261 788 - - Small/Mid U.S. Equity Mid Cap Value Columbia Management Advisors Columbia MidCap Value Z Fund 1-15.36-3.11-0.12-1.34-6.07 11/20/2001-39 84 61-0.90 NAMAX Goldman Sachs Asset Mgt Goldman Sachs Mid-Cap Value Institutional Fund 1-15.38-4.50 2.39 0.05 7.73 9.78 08/01/1995-53 42 31 17 0.76 GSMCX Russell Midcap Value Index -13.01-2.36 1.98-0.84 7.54 - - - - - - - Morningstar Category Average - Mid Cap Value -14.67-4.14 2.00-1.03 6.15 Total Funds in Category 433 433 354 294 133 - - Mid Cap Blend Principal Global Investors MidCap S&P 400 Index Separate Account-I5 A, 1, 2, 8-13.04-1.35 3.90 2.17 7.39 6.93 08/31/1999-27 21 13 14 0.06 - Standard and Poor's 400 MidCap Stock Index -13.02-1.28 4.05 2.20 7.50 - - - - - - - Morningstar Category Average - Mid Cap Blend -14.63-3.41 1.91-0.41 6.11 Total Funds in Category 421 410 369 305 193 - - Mid Cap Growth Columbia Management Advisors Columbia Acorn Z Fund 1-13.89-1.34 4.30 1.54 9.06 14.33 06/09/1970-54 40 48 1 0.76 ACRNX Munder Mutual Funds Munder Mid-Cap Core Growth Y Fund 1-10.40 1.67 3.72 1.66 7.84 8.56 06/24/1998-28 47 47 9 1.10 MGOYX Russell Midcap Growth Index -11.59 0.80 5.89 1.64 6.70 - - - - - - - Morningstar Category Average - Mid Cap Growth -13.10-1.15 3.59 1.34 5.21 Total Funds in Category 771 760 676 601 404 - - Ticker Symbol Page 1

Investment Advisor Investment Option YTD 1 yr. 3 yr. 5 yr. 10 yr. Small Value DFA/Vaughan Nelson/LA Capital SmallCap Value II Separate Account-I2 A, 1, 10, 16, 18, 19-18.43-4.90 0.12-2.97-2.38 06/01/2004-45 52 75-1.20 - Russell 2000 Value Index -18.51-5.99-2.78-3.08 6.47 - - - - - - - Morningstar Category Average - Small Value -17.58-5.21 0.74-1.37 7.24 Total Funds in Category 359 352 308 259 147 - - Small Blend Principal Global Investors SmallCap S&P 600 Index Separate Account-I5 A, 1, 2, 7-13.88 0.08 0.74 0.34 7.37 6.82 08/31/1999-17 46 29 24 0.06 - Standard & Poor's 600 Stock Index -13.79 0.21 0.77 0.27 7.41 - - - - - - - Morningstar Category Average - Small Blend -16.81-3.70 0.61-1.12 6.18 Total Funds in Category 672 659 578 493 289 - - Small Growth Prudential Investments, LLC Prudential Jennison Small Company Z Fund 1, 25-14.02-0.77 2.68 1.52 8.14 7.42 03/01/1996-44 49 33 4 0.89 PSCZX Russell 2000 Growth Index -15.57-1.12 2.07 0.96 5.45 - - - - - - - Morningstar Category Average - Small Growth -15.03-0.92 2.48 0.30 5.16 Total Funds in Category 764 745 661 564 358 - - International Equity Diversified Emerging Markets Principal Global Investors International Emerging Markets Separate Account-I5 A, 4-20.89-14.11 5.13 4.28 16.78 10.39 01/01/1995-20 30 24 19 0.69 - MSCI - Emerging Markets NDTR D Index -21.88-16.15 6.27 4.87 16.07 - - - - - - - Morningstar Category Average - Diversified Emerging Markets Foreign Large Value Average Annual Total Returns through 09/30/2011 Percentile Rankings as of 09/30/2011-23.34-17.72 3.93 2.85 14.71 Total Funds in Category 452 423 314 231 143 - - Dodge & Cox Dodge & Cox International Stock Fund 4-19.38-12.96-0.02-2.16 8.95 6.48 05/01/2001-73 16 17 2 0.65 DODFX MSCI EAFE Value Index -14.52-9.99-1.69-4.82 5.13 - - - - - - - Morningstar Category Average - Foreign Large Value -16.12-10.80-2.48-4.26 5.06 Total Funds in Category 369 362 307 258 151 - - Foreign Large Blend Fidelity / Schroders International I Separate Account-I2 A, 4, 10, 13, 19, 21-18.54-12.36-3.98-4.10 4.64 1.69 07/01/1999-62 81 59 43 1.13 - MSCI - EAFE Index NDTR D -14.98-9.36-1.13-3.46 5.03 - - - - - - - Morningstar Category Average - Foreign Large Blend -17.58-11.64-1.79-3.65 4.42 Total Funds in Category 866 840 735 541 314 - - Balanced/Asset Allocation Retirement Income A, 11, 14, Principal LifeTime Strategic Income Sep Acct-I3 20, -0.09 2.25 5.33 1.43 4.42 4.25 03/30/2001-16 26 75 11 0.63 - Principal LifeTime Strategic Income Blended Index 2.66 4.15 6.84 4.93 5.61 - - - - - - - Morningstar Category Average - Retirement Income -2.24 1.08 4.64 2.70 3.71 Total Funds in Category 261 261 218 83 20 - - Target Date 2000-2010 Principal LifeTime 2010 Separate Account-I3-3.94 1.36 4.60 0.68 4.46 4.19 03/30/2001-33 45 83 8 0.71 - Principal LifeTime 2010 Blended Index -0.27 4.39 5.51 2.71 4.81 - - - - - - - Morningstar Category Average - Target Date 2000-2010 -3.36 0.75 4.25 1.97 3.91 Total Funds in Category 167 167 149 92 16 - - Target Date 2016-2020 Principal LifeTime 2020 Separate Account-I3-7.98-1.51 3.23-0.12 4.54 4.15 03/30/2001-68 55 65 5 0.75 - Principal LifeTime 2020 Blended Index -5.93 0.12 3.38 0.97 4.29 - - - - - - - Morningstar Category Average - Target Date 2016-2020 -5.78-0.40 3.30 0.50 3.54 Total Funds in Category 205 205 176 99 21 - - Target Date 2026-2030 Principal LifeTime 2030 Separate Account-I3-9.59-2.26 2.51-0.62 4.34 3.84 03/30/2001-51 33 39 1 0.77 - Principal LifeTime 2030 Blended Index -7.28-0.25 2.75 0.20 4.06 - - - - - - - Morningstar Category Average - Target Date 2026-2030 -8.80-1.94 2.05-0.84 3.61 Total Funds in Category 205 205 176 99 16 - - Target Date 2036-2040 Principal LifeTime 2040 Separate Account-I3-11.04-2.96 1.63-1.15 4.10 3.69 03/30/2001-39 36 32 1 0.78 - Since Inception Inception Date YTD 1 yr. 3 yr. 5 yr. 10 yr. Principal LifeTime 2040 Blended Index -8.65-0.95 2.11-0.43 3.90 - - - - - - - Total Inv. Expense Gross Morningstar Category Average - Target Date 2036-2040 -10.64-3.02 1.39-1.47 3.41 Total Funds in Category 202 202 170 92 16 - - Ticker Symbol Page 2

Principal LifeTime 2050 Blended Index -9.75-1.62 1.67-0.78 3.88 - - - - - - - Morningstar Category Average - Target Date 2050+ -11.51-3.57 1.21-2.18 3.37 Total Funds in Category 235 218 143 25 6 - - Short-Term Fixed Income Stable Value Morley Financial Services, Inc Principal Stable Value Inst Fund 1.67 2.33 2.52 3.30 3.77 4.49 01/09/1997 - - - - - 0.25 - Barclays Capital 1-3 Yr Government Index 1.35 1.23 2.74 3.96 3.44 - - - - - - - Fixed Income Intermediate-Term Bond American Century Inv. Mgmt. American Century Diversified Bond Inv Fund 9, 12, 14, 25 5.88 4.26 7.80 6.79 5.41 5.43 12/03/2001-40 65 21 38 0.61 ADFIX Principal Global Investors Bond and Mortgage Separate Account-I5 A, 12, 14 5.48 5.54 10.43 5.87 5.62 8.75 02/01/1983-8 17 52 28 0.30 - Barclays Capital Aggregate Bond Index 6.65 5.26 7.97 6.53 5.66 - - - - - - - Barclays Capital U.S. Government/Credit 5-10 Year Index 9.03 5.82 10.86 7.73 6.66 - - - - - - - Morningstar Category Average - Intermediate-Term Bond 4.45 3.53 8.56 5.63 5.10 Total Funds in Category 1211 1180 1026 862 568 - - Intermediate Government MFS Investment Management MFS Government Securities R3 Fund 12, 14, 25 6.38 4.49 6.88 6.32 4.98 5.56 04/01/2005-66 36 30 37 0.87 MFGHX Barclays Capital U.S. Government Index 8.11 5.58 6.43 6.56 5.44 - - - - - - - Morningstar Category Average - Intermediate Government 5.93 4.92 6.72 5.84 4.70 Total Funds in Category 346 343 311 293 235 - - Owned Real Estate Principal Real Estate Inv U.S. Property Separate Account-I5 A, 23 13.15 18.54-7.02-1.44 4.71-01/01/1982 - - - - - 0.85 - NFI-ODCE Equal-Weight - - - - - - - - - - - - Other Technology Columbia Management Advisors Columbia Technology A Fund 3, 25-15.16-6.82 4.63 0.37 8.55 11.83 11/01/2002-85 84 78 10 1.47 CTCAX Morningstar Technology Sector Index -8.36 2.17 8.00 3.86 5.27 - - - - - - - Morningstar Category Average - Technology -12.96-2.28 8.27 2.76 4.89 Total Funds in Category 209 209 177 169 131 - - Natural Resources Prudential Investments, LLC Prudential Jennison Natural Resources Z Fund 3-28.06-13.72 2.26 4.64 17.94 12.36 09/13/1996-82 18 12 3 0.90 PNRZX Must be accompanied by disclosures on the following page. Standard & Poor's North American Natural Resources Index Average Annual Total Returns through 09/30/2011 Percentile Rankings as of 09/30/2011 Since Inception Investment Advisor Investment Option YTD 1 yr. 3 yr. 5 yr. 10 yr. Inception Date YTD 1 yr. 3 yr. 5 yr. 10 yr. Target Date 2050+ Principal LifeTime 2050 Separate Account-I3-11.96-3.52 1.12-1.49 3.88 3.20 03/30/2001-40 39 13 1 0.80 - -18.90-1.63-0.65 3.18 10.10 - - - - - - - Total Inv. Expense Gross Morningstar Category Average - Natural Resources -22.75-8.42-1.55 1.69 12.50 Total Funds in Category 145 138 118 71 38 - - Ticker Symbol Page 3

Disclosures A Sub-advised Investment Options include Separate Accounts available through a group annuity contract with the Principal Life Insurance Company. Insurance products and plan administrative services are provided by Principal Life Insurance Company a member of the Principal Financial Group, Des Moines, IA 50392. See the group annuity contract for the full name of the Separate Account. Certain investment options may not be available in all states or U.S. commonwealths. A mutual fund's share price and investment return will vary with market conditions, and the principal value of an investment when you sell your shares may be more or less than the original cost. Percentile rankings are based on total returns. Returns shown for periods of less than one year are not annualized. All returns displayed here are after Total Investment Expense of the investment option. Separate Accounts are made available through a group annuity contract with the Principal Life Insurance Company, Des Moines, IA 50392. They may not be available in all states. Ask your representative for more details. Insurance products and plan administrative services are provided by Principal Life Insurance Company. Securities are offered through Princor Financial Services Corporation, 800-547-7754, member SIPC and/or independent broker/dealers. Securities sold by a Princor Registered Representative are offered through Princor. Princor and Principal Life are members of the Principal Financial Group, Des Moines, IA 50392. Certain investment options may not be available in all states or U.S. commonwealths. Investors should carefully consider a mutual fund s investment objectives, risks, charges, and expenses prior to investing. A prospectus, or summary prospectus if available, containing this and other information can be obtained by contacting a financial professional, visiting principal.com, or calling 1-800-547-7754. Read the prospectus carefully before investing. Before directing retirement funds to a separate account, investors should carefully consider the investment objectives, risks, charges and expenses of the separate account as well as their individual risk tolerance, time horizon and goals. For additional information contact us at 1-800-547-7754 or by visiting principal.com. This report includes investment options that contain information from a variety of sources. Morningstar generally provides holdings information, operations data, and rankings or statistics proprietary to Morningstar. Morningstar is also the source of information on certain mutual funds. (C) 2011 Morningstar, Inc. All Rights Reserved. Part of the mutual fund data contained herein: (1) is proprietary to Morningstar and/or its content providers: (2) may not be copied or distributed; and (3) is not warranted to be accurate, complete, or timely. Neither Morningstar nor its content providers are responsible for any damages or losses arising from any use of this information. For a Mutual Fund investment option, Total Investment Expense gross equals the sum of (a) the total fund operating expenses plus (b) if the mutual fund invests in other mutual funds, the weighted-average management fee of those other mutual funds, as listed in the most recent prospectus. The actual Total Investment Expense may change if the mutual fund investment option's allocation of assets to other mutual funds changes. For a Separate Account investment option, Total Investment Expense gross equals the sum of these expenses: (a)the amount of money, expressed as a percentage, deducted for the costs of managing a separate account where applicable, fees for plan administrative services and agent compensation, plus (b) if the separate account invests in an underlying mutual fund, the total fund operating expenses of the underlying mutual fund, plus (c) if an underlying mutual funds invests in other mutual funds, the weighted-average management fee of those other mutual funds, as listed in the most recent prospectus. The actual Total Investment Expense may change if an underlying mutual fund s allocation of assets to other mutual funds changes. Any operating expenses of a mutual fund or underlying mutual fund that are part of net Total Investment Expense are obtained from the mutual fund's most recent prospectus. The operating expenses shown as part of net Total Investment Expense include voluntary expense limits and fee credit. Page 4

1. Small-cap and mid-cap investment options are subject to more fluctuation in value and may have additional risks than other investment options with stocks of larger, more stable companies. 2. Each index based investment option is invested in the stocks or bonds of the index it tracks. Performance of indexes reflects the unmanaged results for the market segment the selected stocks or bonds represent. There is no assurance an index based investment option will match the performance of the index tracked. 3. Specialty investment options may experience greater volatility than funds with a broader investment strategy due to sector focus. These investment options are not intended to serve as a complete investment program by itself. 4. International and global investment options are subject to additional risk due to fluctuating exchange rates, foreign accounting and financial policies, and other economic and political environments. 6. S&P 500 is a trademark of The McGraw-Hill Companies, Inc., and has been licensed for use by Principal Life Insurance Company and Principal Management Corporation. The product is not sponsored, endorsed, sold or promoted by Standard & Poor's and Standard & Poor's makes no representation regarding the advisability of investing in the product. 7. S&P SmallCap 600 is a trademark of The McGraw-Hill Companies, Inc. and has been licensed for use by Principal Life Insurance Company and Principal Management Corporation. The product is not sponsored, endorsed, sold or promoted by Standard & Poor's and Standard & Poor's makes no representation regarding the advisability of investing in the product. 8. S&P MidCap 400 is a trademark of The McGraw-Hill Companies, Inc. and has been licensed for use by Principal Life Insurance Company and Principal Management Corporation. The product is not sponsored, endorsed, sold or promoted by Standard & Poor's and Standard & Poor's makes no representation regarding the advisability of investing in the Product. 9. As of December 3, 2001, Bond, Intermediate-Term Bond, and Premium Bond merged into Diversified Bond. For periods prior to December 3, 2001, Institutional Class has been restated to reflect the expenses of the Investor Class. 10. This Separate Account invests solely in the Institutional class shares of the Principal Funds. All voting rights associated with ownership of shares in the mutual fund are the rights of the Separate Account, not of contract holders investing in the Separate Account. For further information on the underlying mutual fund, see the prospectus of the fund. 11. Equity investment options involve greater risk, including heightened volatility, than fixed-income investment options. Fixed-income investment options are subject to interest rate risk, and their value will decline as interest rates rise. 12. Fixed-income investment options are subject to interest rate risk, and their value will decline as interest rates rise. Neither the principal of bond investment options nor their yields are guaranteed by the U.S. government. 13. Effective March 31, 2007, references to Fidelity Management & Research as investment advisor were replaced with Fidelity (Pyramis Global Adv). This is a name change only and does not affect the management, objective, or strategy of this investment option. 14. Fixed-income and asset allocation investment options that invest in mortgage securities are subject to increased risk due to real estate exposure. 16. This investment option maintains a voluntary waiver which is reflected in the value displayed for Total Investment Expense - Net. This waiver may be discontinued at any time. 18. Effective May 1, 2009, LA Capital was added as an additional sub-advisor. Performance results displayed reflect all sub-advisors managing this portfolio during the time periods displayed. 19. This Separate Account invests solely in the Institutional class share of a mutual fund (Fund) from Principal Funds, Inc. The manager of the Fund, Principal Management Corporation, invests between 10% and 40% of the Fund's assets in common stocks in an attempt to match or exceed the performance of the Fund's benchmark index for performance. Page 5

20. Asset allocation does not guarantee a profit or protect against a loss. Investing in real estate, small-cap, international, and high-yield investment options involves additional risks. Additionally there is no guarantee this investment option will provide adequate income at or through retirement. 21. Effective January 11, 2010, Schroders was added as an additional sub-advisor. Performance results displayed reflect all sub-advisors managing this portfolio during the time periods displayed. 22. The Investment Advisor will display "" for certain target-date, target-risk and specialty investment options where the assets are directed by the Investment Manager to multiple underlying investment options. These underlying investment options may use multiple sub-advisors who are responsible for the day-to-day management responsibilities. 23. This investment option is subject to investment and liquidity risk and other risks inherent in real estate such as those associated with general and local economic conditions. If you elect to contribute funds into the U.S. Property Separate Account, you may not be able to immediately withdraw them. 24. This Separate Account invests directly in the Institutional class shares of a Principal LifeTime Fund. The mutual fund operating expenses for each Principal LifeTime Fund are reflected in the Total Investment Expense of the Separate Accounts well as the operating expenses of the underlying funds in which the Principal LifeTime Fund invests. Based on the asset allocation of the Principal LifeTime Funds as in the prospectus dated March 1, 2011, the weighted average operating expenses of the underlying funds are: Principal LifeTime Strategic Income, 0.59%; Principal LifeTime 2010, 0.67%; Principal LifeTime 2015, 0.69%; Principal LifeTime 2020, 0.71%; Principal LifeTime 2025, 0.72%; Principal LifeTime 2030, 0.73%; Principal LifeTime 2035, 0.74%; Principal LifeTime 2040, 0.74%; Principal LifeTime 2045, 0.75%; Principal LifeTime 2050, 0.76%; Principal LifeTime 2055, 0.75%. For further information on all mutual fund expenses, see the prospectus of the underlying Principal LifeTime Fund. All voting rights associated with ownership of shares in the mutual fund are the rights of the Separate Account, not of contract holders investing in the Separate Account. 25. For Mutual Fund Network investment options, returns for all time periods, except the Since Inception time frame, may include the historical performance of the oldest share class of the fund, adjusted to reflect a portion of the fees and expenses of this share class. Since Inception returns display the actual return of this share class and do not reflect the adjusted returns of the oldest share class. Please see the fund's prospectus for more information on specific expenses, and the fund's most recent shareholder report for actual date of first sale. Expenses are deducted from income earned by the fund. As a result, dividends and investment results will differ for each share class. Benchmark Descriptions Barclays Capital 1-3 Yr Government Index is comprised of both the Treasury Bond Index and the Agency Bond Index. Barclays Capital Aggregate Bond Index represents securities that are domestic, taxable, and dollar denominated. The index covers the U. S. investment grade fixed rate bond market, with index components for government and corporate securities, mortgage pass-through securities, and asset-backed securities. These major sectors are subdivided into more specific indices that are calculated and reported on a regular basis. Barclays Capital U.S. Government Index is the U.S. Government component of the U.S. Government/Credit Index. Barclays Capital U.S. Government/Credit 5-10 Year Index tracks the return of the U.S. Government/Credit with a maturity window of 5-10 years. Morningstar Technology Sector Index tracks the performance of companies engaged in the design, development, and support of computer operating systems and applications. MSCI - EAFE Index NDTR D is listed for foreign stock funds (EAFE refers to Europe, Australia, and Far East). Widely accepted as a benchmark for international stock performance, the EAFE Index is an aggregate of 21 individual country indexes. MSCI - Emerging Markets NDTR D Index measures equity market performance in the global emerging markets. It consists of 26 emerging market countries in Europe, Latin America and the Pacific Basin. MSCI EAFE Value Index is a subset of the MSCI EAFE Index, which is an unmanaged index that measures the stock returns of companies in developed economies outside of North America. The MSCI EAFE Value Index consists of securities classified by MSCI as most representing the value style. Page 6

NFI-ODCE Equal-Weight is the NCREIF Fund Index - Open End Diversified Core Equity. It is a fund-level equal-weighted, time-weighted return index and includes property investments at ownership share, cash balances and leverage. The return series is net of the average fee charged by accounts that make up the index. Principal LifeTime 2010 Blended Index is composed of underlying indexes that represent the target asset allocation weights of the Principal LifeTime 2010 30.90% Russell 3000 Index, 10.10% MSCI EAFE Index, and 59.00% Barclays Capital Aggregate Index. Principal LifeTime 2020 Blended Index is composed of underlying indexes that represent the target asset allocation weights of the Principal LifeTime 2020 49.00% Russell 3000 Index, 19.85% MSCI EAFE Index, and 31.15% Barclays Capital Aggregate Index. Principal LifeTime 2030 Blended Index is composed of underlying indexes that represent the target asset allocation weights of the Principal LifeTime 2030 54.10% Russell 3000 Index, 22.75% MSCI EAFE Index, and 23.15% Barclays Capital Aggregate Index. Principal LifeTime 2040 Blended Index is composed of underlying indexes that represent the target asset allocation weights of the Principal LifeTime 2040 58.60% Russell 3000 Index, 25.80% MSCI EAFE Index, and 15.60% Barclays Capital Aggregate Index. Principal LifeTime 2050 Blended Index is composed of underlying indexes that represent the target asset allocation weights of the Principal LifeTime 2050 60.70% Russell 3000 Index, 29.50% MSCI EAFE Index, and 9.80% Barclays Capital Aggregate Index. Principal LifeTime Strategic Income Blended Index is composed of underlying indexes that represent the target asset allocation weights of the Principal LifeTime Strategic Income portfolio. The weightings as of March 31, 2011 are 18.00% Russell 3000 Index, 4.40% MSCI EAFE Index, and 77.60% Barclays Capital Aggregate Index. Russell 1000 Growth Index is a market-capitalization weighted index of those firms in the Russell 1000 with higher price-to-book ratios and higher forecasted growth values. Russell 1000 Index consists of the 1000 largest companies within the Russell 3000 index. Also known as the Market-Oriented Index, because it represents the group of stocks from which most active money managers choose. Russell 1000 Value Index is a market-capitalization weighted index of those firms in the Russell 1000 with lower price-to-book ratios and lower forecasted growth values. Russell 2000 Growth Index is a market-weighted total return index that measures the performance of companies within the Russell 2000 Index having higher price-to-book ratio and higher forecasted growth values. Russell 2000 Value Index is a market-weighted total return index that measures the performance of companies within the Russell 2000 Index having lower price-to-book ratios and lower forecasted growth values. Russell Midcap Growth Index is a market-weighted total return index that measures the performance of companies within the Russell Midcap Index having higher price-to-book ratios and higher forecasted growth values. Russell Midcap Value Index is a market-weighted total return index that measures the performance of companies within the Russell Midcap index having lower price-to-book ratios and lower forecasted growth values. Standard & Poor's 500 Index is a market capitalization-weighted index of 500 widely held stocks often used as a proxy for the stock market. Standard & Poor's 600 Stock Index is a small cap index that consists of 600 domestic stocks chosen for market size, liquidity, and industry group representation. Page 7

Standard & Poor's North American Natural Resources Index measures the performance of U.S. traded stocks of natural resource related companies in the U.S. and Canada. Page 8

Glossary of Terms 7 Day Yield - The 7-Day Simple Yield % more closely reflects the current earnings of this money market investment option than the total return displayed. Category Average Return - Morningstar takes the average return of the funds that exist in a category for the time period and divide by the number of funds that exist for that time period. For calendar year category average returns Morningstar includes funds that have merged, liquidated, or changed categories when calculating category averages. Total Investment Expense Gross - The maximum expense ratio that can be applied to an investment option. This includes expenses and management fees, including 12b-1 fees, administrative fees, and all other asset-based costs incurred by the investment option, except brokerage costs. Inception Date - Date on which the investment option began its operations. Morningstar Category - The Morningstar Category identifies investment options based on their actual investment styles as measured by their underlying portfolio holdings (portfolio statistics and compositions over the past three years). Percentile Rankings - Each investment s total returns are compared to other investments in the same Morningstar category for various time periods. Total returns are ranked on a scale from 1 to 100 where 1 represents the highest-returning 1% of investments and 100 represents the lowest returning investments. Investment Advisor - May include Registered Investment Advisers as defined in the Advisers Act of 1940, Investment Advisers as defined in the Investment Company Act of 1940, as well as a company employed by the investment option's advisor to handle the investment option's day-to-day management. In these instances, the portfolio manager generally works for the fund's subadvisor, and not the advisor. See definition of Multiple Sub-Advisor appearing else where in this presentation for greater detail about Sub-Advisors. Ticker Symbol - This is a symbol assigned to a mutual fund by NASDAQ and is commonly used to locate funds on electronic price-quoting systems. To receive a ticker symbol, mutual funds must meet minimum requirements. Mutual funds may qualify for a regular ticker if the fund has more than $25 million in assets, or more than 1,000 shareholders. Supplemental tickers must have at least $10 million in assets, or have completed a minimum of two business years. Supplemental NASDAQ funds do not appear in newspaper listings, even though they report performance to and are tracked by NASDAQ. Page 9