Donations can be made to political candidates in various amounts. The FEC regulates these donations, and individual groups, excluding PACs, must disclose donations over $250 per year.
The following table lists the top 100 contributions donated to Joni K. Ernst's campaign in 2019.
| Rank | Date | Amount | Contributor |
|---|---|---|---|
| 1 | 2019-09-30 | $25,200 | David F. Grohne |
| 1 | 2019-09-30 | $25,200 | James Timmerman |
| 1 | 2019-09-30 | $25,200 | Margaret T. Grohne |
| 1 | 2019-09-30 | $25,200 | Norman Braman |
| 1 | 2019-09-30 | $25,200 | Robert Arnott |
| 1 | 2019-09-30 | $25,200 | William F. Austin |
| 7 | 2019-12-31 | $24,400 | Timothy W. Williams |
| 8 | 2019-09-30 | $21,600 | Elliot Gibber |
| 9 | 2019-06-12 | $20,800 | Douglas Kimmelman |
| 10 | 2019-09-19 | $18,000 | Leona Cox |
| 11 | 2019-07-12 | $16,800 | Jay L. Sedwick |
| 11 | 2019-08-02 | $16,800 | Michael J. Bidwill |
| 11 | 2019-08-09 | $16,800 | Roger K. Brooks |
| 11 | 2019-08-14 | $16,800 | Steve Roodman |
| 11 | 2019-09-11 | $16,800 | Nikki Nichols |
| 11 | 2019-09-13 | $16,800 | Jon Crane |
| 11 | 2019-10-31 | $16,800 | Irma Braman |
| 11 | 2019-10-31 | $16,800 | Itzhak Ezratti |
| 11 | 2019-12-31 | $16,800 | Paul Atkins |
| 20 | 2019-12-31 | $15,600 | Janet Vincze |
| 21 | 2019-07-17 | $15,000 | Ray Croghan |
| 21 | 2019-09-11 | $15,000 | Bobby D. Cox |
| 21 | 2019-09-25 | $15,000 | Stephanie Drescher |
| 21 | 2019-09-27 | $15,000 | Mitchell S. Steir |
| 25 | 2019-10-31 | $13,600 | Gina Bridwell |
| 26 | 2019-06-28 | $12,000 | Samuel Zell |
| 27 | 2019-12-17 | $11,220 | John Pietrusewicz |
| 28 | 2019-05-24 | $11,200 | Michael R. Blaser |
| 28 | 2019-10-04 | $11,200 | Albert Nahmad |
| 28 | 2019-10-04 | $11,200 | Jane Nahmad |
| 28 | 2019-10-07 | $11,200 | Robert J. Shillman |
| 28 | 2019-10-16 | $11,200 | Marti Tomson Rodamaker |
| 28 | 2019-10-16 | $11,200 | Pamela G. De Vos |
| 28 | 2019-10-23 | $11,200 | Edward Hatfield |
| 28 | 2019-11-08 | $11,200 | Ian Schaad |
| 28 | 2019-11-21 | $11,200 | Sam Fox |
| 28 | 2019-11-22 | $11,200 | Jan Duncan |
| 28 | 2019-11-27 | $11,200 | Andrea W. Carlton |
| 28 | 2019-11-27 | $11,200 | Kurt E. Rasmussen |
| 28 | 2019-11-27 | $11,200 | Lynette Skow Rasmussen |
| 28 | 2019-11-27 | $11,200 | Rick Carlton |
| 28 | 2019-12-10 | $11,200 | Richard H. Kimberly |
| 28 | 2019-12-18 | $11,200 | Yossie Hollander |
| 28 | 2019-12-20 | $11,200 | Neal Moszkowski |
| 28 | 2019-12-23 | $11,200 | Janet Duchossois |
| 28 | 2019-12-27 | $11,200 | Lawrence Bernstein |
| 47 | 2019-10-07 | $10,800 | Elizabeth M. Stern |
| 47 | 2019-12-04 | $10,800 | Donald Bollinger |
| 49 | 2019-10-16 | $10,000 | Tucker Bridwell |
| 49 | 2019-11-15 | $10,000 | Walter Lauridsen |
| 51 | 2019-03-11 | $8,400 | Phil Gramm |
| 51 | 2019-03-11 | $8,400 | Wendy Gramm |
| 51 | 2019-03-13 | $8,400 | Thomas Klingenstein |
| 51 | 2019-03-18 | $8,400 | Linda K. Juckette |
| 51 | 2019-03-19 | $8,400 | Douglas J. Reichardt |
| 51 | 2019-03-22 | $8,400 | William Bernau |
| 51 | 2019-03-23 | $8,400 | Carl Thoma |
| 51 | 2019-03-23 | $8,400 | Marilyn Thoma |
| 51 | 2019-03-24 | $8,400 | Jeffrey Lamberti |
| 51 | 2019-03-26 | $8,400 | Mary Weiss |
| 51 | 2019-03-26 | $8,400 | Richard Weiss |
| 51 | 2019-03-27 | $8,400 | Ross H. Perot Jr. |
| 51 | 2019-03-31 | $8,400 | Ben Heller |
| 51 | 2019-03-31 | $8,400 | Tim Bianco |
| 51 | 2019-05-30 | $8,400 | Julie Blaser |
| 51 | 2019-06-30 | $8,400 | Margaret Bernau |
| 51 | 2019-06-30 | $8,400 | Thomas R. Bernau |
| 51 | 2019-07-02 | $8,400 | Donald Summers |
| 51 | 2019-07-15 | $8,400 | Pamela Gilardi |
| 51 | 2019-07-23 | $8,400 | Jay L. Sedwick |
| 51 | 2019-07-25 | $8,400 | Jan Duncan |
| 51 | 2019-07-31 | $8,400 | Ron Erickson |
| 51 | 2019-08-01 | $8,400 | Jane Fahr |
| 51 | 2019-08-01 | $8,400 | Robert E. Fahr |
| 51 | 2019-08-09 | $8,400 | Michael J. Bidwill |
| 51 | 2019-08-09 | $8,400 | Reagan Stone |
| 51 | 2019-08-13 | $8,400 | Roger K. Brooks |
| 51 | 2019-08-15 | $8,400 | Dawn Champion |
| 51 | 2019-08-15 | $8,400 | Jon Champion |
| 51 | 2019-08-16 | $8,400 | Frederick W. Smith |
| 51 | 2019-08-26 | $8,400 | Samuel Zell |
| 51 | 2019-08-26 | $8,400 | Steven Martin |
| 51 | 2019-09-04 | $8,400 | Robert G. Pulver |
| 51 | 2019-09-09 | $8,400 | Reagan Stone |
| 51 | 2019-09-12 | $8,400 | James Gregory |
| 51 | 2019-09-14 | $8,400 | Michael Malcolm |
| 51 | 2019-09-18 | $8,400 | William Laverack |
| 51 | 2019-09-19 | $8,400 | Jon Crane |
| 51 | 2019-09-19 | $8,400 | Nikki Nichols |
| 51 | 2019-09-23 | $8,400 | Lacy Williams II |
| 51 | 2019-09-27 | $8,400 | Kannon Kumar Shanmugam |
| 51 | 2019-09-27 | $8,400 | Robert Zochowski |
| 51 | 2019-09-30 | $8,400 | Gerald Timmerman |
| 51 | 2019-09-30 | $8,400 | Lynn Timmerman |
| 51 | 2019-09-30 | $8,400 | Reagan Stone |
| 96 | 2019-01-25 | $8,100 | David H. Edwards |
| 96 | 2019-01-25 | $8,100 | Jody R. Edwards |
| 96 | 2019-02-01 | $8,100 | Frank C. Sullivan |
| 96 | 2019-07-22 | $8,100 | Yvonne J. Bitter |
| 100 | 2019-03-31 | $8,000 | Karen Hubbard |
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