| 6.33 Data as of May 20 |  +0.05 / +0.80%Today’s Change | 5.52 Today|||52-Week Range 7.87 | -2.76% Year-to-Date |
| Individual stakeholders | 7.71% |
| Mutual fund holders | 40.17% |
| Other institutional | 34.05% |
| 3/31/2013 | RICE, HALL, JAMES & ASSOCIATES L... Bought 1.5 Million shares of Ion Geophysical Corp |
| 3/31/2013 | PRINCIPAL GLOBAL INVESTORS LLC Bought 1.4 Million shares of Ion Geophysical Corp |
| 3/31/2013 | ST. DENIS J. VILLERE & CO. LLC Bought 1.1 Million shares of Ion Geophysical Corp |
| Stockholder | Stake | Shares owned | Total value ($) | Shares bought / sold | Total change |
|---|---|---|---|---|---|
| Invesco Advisers, Inc. | 8.29% | 13,053,788 | 81,455,637 | +8,733 | +0.07% |
| BlackRock Fund Advisors | 6.36% | 10,020,978 | 62,530,903 | +886,930 | +9.71% |
| St. Denis J. Villere & Co. LLC | 6.32% | 9,953,674 | 62,110,926 | +1,052,424 | +11.82% |
| Wellington Management Co. LLP | 6.23% | 9,813,544 | 61,236,515 | +837,409 | +9.33% |
| Wells Capital Management, Inc. | 5.41% | 8,520,296 | 53,166,647 | -107,143 | -1.24% |
| The Vanguard Group, Inc. | 4.81% | 7,582,584 | 47,315,324 | -208,043 | -2.67% |
| Daruma Capital Management LLC | 3.72% | 5,856,613 | 36,545,265 | -912,383 | -13.48% |
| GW Capital, Inc. | 2.90% | 4,574,340 | 28,543,882 | -31,306 | -0.68% |
| Dimensional Fund Advisors, Inc. | 2.32% | 3,656,245 | 22,814,969 | +10,063 | +0.28% |
| SSgA Funds Management, Inc. | 2.01% | 3,168,188 | 19,769,493 | +59,159 | +1.90% |
| Mutual fund | Stake | Shares owned | Total value ($) | Shares bought / sold | Total change |
|---|---|---|---|---|---|
| Invesco Select Companies Fund | 4.72% | 7,427,900 | 46,350,096 | 0 | 0.00% |
| Wells Fargo Advantage Small Cap V... | 4.10% | 6,464,900 | 40,340,976 | +8,200 | +0.13% |
| Invesco Small Cap Value Fund | 3.43% | 5,395,043 | 33,665,068 | 0 | 0.00% |
| Vanguard Explorer Fund | 2.44% | 3,851,597 | 24,033,965 | +271,459 | +7.58% |
| iShares Core S&P Small Cap ETF | 1.33% | 2,101,081 | 13,110,745 | +46,100 | +2.24% |
| iShares Russell 2000 Index Fund | 1.32% | 2,077,120 | 12,961,229 | -39,990 | -1.89% |
| Vanguard Small Cap Index Fund | 1.32% | 2,071,617 | 12,926,890 | +45,040 | +2.22% |
| T Rowe Price Small Cap Stock Fund | 1.31% | 2,062,700 | 12,871,248 | -3,000 | -0.15% |
| Vanguard Total Stock Market Index... | 1.04% | 1,645,213 | 10,266,129 | +71,611 | +4.55% |
| Government Pension Fund - Global ... | 1.01% | 1,596,500 | 9,962,160 | +137,616 | +9.43% |
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