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 John M. Katko's campaign in 2019.
| Rank | Date | Amount | Contributor |
|---|---|---|---|
| 1 | 2019-05-09 | $5,600 | Evan Dreyfuss |
| 1 | 2019-05-20 | $5,600 | Charles Johnson |
| 1 | 2019-05-24 | $5,600 | Marc Benioff |
| 1 | 2019-09-11 | $5,600 | John Kleinheinz |
| 1 | 2019-09-24 | $5,600 | Linda H. Kenan |
| 1 | 2019-10-31 | $5,600 | Albert C. Crawford |
| 1 | 2019-11-07 | $5,600 | Jed Manocherian |
| 1 | 2019-11-22 | $5,600 | Kathryn Taishoff |
| 1 | 2019-11-22 | $5,600 | Robert Taishoff |
| 10 | 2019-05-09 | $5,400 | Martin A. Schaeffer |
| 10 | 2019-06-25 | $5,400 | David Rich |
| 10 | 2019-06-30 | $5,400 | Scott Smith |
| 13 | 2019-03-14 | $5,350 | Bruce A. Kenan |
| 13 | 2019-05-09 | $5,350 | Phillip Rubenstein |
| 15 | 2019-05-06 | $5,200 | Steven Wells |
| 16 | 2019-10-31 | $5,100 | Michelle C. Crawford |
| 17 | 2019-08-23 | $5,000 | Michael J. Falcone |
| 18 | 2019-05-06 | $3,800 | Brian Raphael |
| 19 | 2019-05-06 | $3,200 | Irving G. Raphael |
| 20 | 2019-04-29 | $2,800 | Warren Stephens |
| 20 | 2019-06-17 | $2,800 | Barbara Karplus |
| 20 | 2019-06-17 | $2,800 | Rod Womer |
| 20 | 2019-06-30 | $2,800 | Elizabeth Dreyfuss |
| 20 | 2019-07-25 | $2,800 | Mark Fallon |
| 20 | 2019-07-29 | $2,800 | Mike Terry |
| 20 | 2019-08-23 | $2,800 | Chacea L. Sundman |
| 20 | 2019-08-23 | $2,800 | Donald J. Sundman |
| 20 | 2019-08-23 | $2,800 | Jay Bernhardt |
| 20 | 2019-08-23 | $2,800 | Laura O'Brien |
| 20 | 2019-09-11 | $2,800 | Anne Marion |
| 20 | 2019-09-11 | $2,800 | Paul Andrews Jr. |
| 20 | 2019-09-16 | $2,800 | Richard Campo |
| 20 | 2019-09-16 | $2,800 | Richard Weekley |
| 20 | 2019-10-10 | $2,800 | Todd Caputo |
| 20 | 2019-10-16 | $2,800 | Chris Crane |
| 20 | 2019-11-12 | $2,800 | Oswaldo Palomo |
| 20 | 2019-11-23 | $2,800 | Mark Fallon |
| 20 | 2019-11-25 | $2,800 | Franklin Antonio |
| 20 | 2019-12-21 | $2,800 | Ralph Hellmann |
| 20 | 2019-12-31 | $2,800 | Harlan Crow |
| 20 | 2019-12-31 | $2,800 | Katherine Crow |
| 42 | 2019-02-22 | $2,700 | Elizabeth Dreyfuss |
| 42 | 2019-03-25 | $2,700 | Oswaldo Palomo |
| 42 | 2019-04-30 | $2,700 | Lindsey Ledwin |
| 42 | 2019-09-11 | $2,700 | Harlan Crow |
| 46 | 2019-08-02 | $2,500 | William H. Mocarski |
| 46 | 2019-08-23 | $2,500 | Arthur F. Grant |
| 46 | 2019-08-23 | $2,500 | Deborah F. Tracey |
| 46 | 2019-08-23 | $2,500 | James Ranalli |
| 46 | 2019-09-04 | $2,500 | Ravi Raman |
| 51 | 2019-09-04 | $2,350 | Stephen J. Congel |
| 52 | 2019-08-23 | $2,200 | Kathleen Bernhardt |
| 53 | 2019-10-15 | $2,100 | Ann Barker Griffith |
| 54 | 2019-02-22 | $2,000 | William Griffith |
| 54 | 2019-05-09 | $2,000 | Arnold J. Rubenstein |
| 54 | 2019-06-20 | $2,000 | Ann Barker Griffith |
| 54 | 2019-06-20 | $2,000 | Neil Goldberg |
| 54 | 2019-08-19 | $2,000 | Edward F. Levine |
| 54 | 2019-08-20 | $2,000 | Nancy Byrne |
| 54 | 2019-09-27 | $2,000 | Caryn Seidman-Becker |
| 54 | 2019-09-27 | $2,000 | Melissa Bartlett |
| 62 | 2019-04-29 | $1,500 | David Grenader |
| 62 | 2019-04-29 | $1,500 | Stuart Shaw |
| 62 | 2019-08-23 | $1,500 | Kemper J. Matt |
| 62 | 2019-09-16 | $1,500 | Patrick Moran |
| 62 | 2019-12-26 | $1,500 | Jordan Savitsky |
| 67 | 2019-02-14 | $1,000 | Dennis Potter |
| 67 | 2019-02-14 | $1,000 | James Walsh |
| 67 | 2019-03-01 | $1,000 | Arthur F. Grant |
| 67 | 2019-03-28 | $1,000 | Sean Joyce |
| 67 | 2019-03-29 | $1,000 | Jeffery More |
| 67 | 2019-03-29 | $1,000 | Julie Chlopecki |
| 67 | 2019-03-29 | $1,000 | Tyson Redpath |
| 67 | 2019-03-31 | $1,000 | James Ranalli |
| 67 | 2019-04-08 | $1,000 | David Barish |
| 67 | 2019-04-29 | $1,000 | Jay Novik |
| 67 | 2019-04-29 | $1,000 | Paul Bury III |
| 67 | 2019-04-29 | $1,000 | Tim Von Dohlen |
| 67 | 2019-05-06 | $1,000 | Gary Lavine |
| 67 | 2019-05-09 | $1,000 | Martin Wells |
| 67 | 2019-05-09 | $1,000 | Robert H. Linn |
| 67 | 2019-05-22 | $1,000 | Mark Haun |
| 67 | 2019-05-23 | $1,000 | Richard Wells |
| 67 | 2019-05-23 | $1,000 | Robert Constable |
| 67 | 2019-05-24 | $1,000 | Jeffery More |
| 67 | 2019-05-24 | $1,000 | Jeffrey MacKinnon |
| 67 | 2019-05-31 | $1,000 | James C. Burns |
| 67 | 2019-06-10 | $1,000 | Craig Buckhout |
| 67 | 2019-06-10 | $1,000 | Dave Weiler |
| 67 | 2019-06-10 | $1,000 | Doug Shepard |
| 67 | 2019-06-17 | $1,000 | Richard H. Kimberly |
| 67 | 2019-06-20 | $1,000 | Andrew Frisbie |
| 67 | 2019-06-20 | $1,000 | Kemper J. Matt |
| 67 | 2019-06-20 | $1,000 | Richard Huftalen |
| 67 | 2019-06-20 | $1,000 | Tucker Lounsbury |
| 67 | 2019-06-20 | $1,000 | William Brod |
| 67 | 2019-06-27 | $1,000 | Bradford Card |
| 67 | 2019-06-27 | $1,000 | Jeffrey Shapiro |
| 67 | 2019-06-27 | $1,000 | Thomas Potter |
| 67 | 2019-06-28 | $1,000 | Kevin Eldred |
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