| HUDSON HIGHLANDS FJORD TRAIL INC | $60,054,466 | C11 | published | | Poughkeepsie, NY | 2024 |
| GOLDEN GATE NATIONAL PARKS CONSERVANCY | $54,673,377 | C11 | published | space: outer | San Francisco, CA | 2024 |
| NATIONAL MARINE SANCTUARY FOUNDATION | $35,981,845 | C11 | published | space: outer | Silver Spring, MD | 2024 |
| BUFFALO BAYOU PARTNERSHIP | $31,042,524 | C11 | published | | Houston, TX | 2024 |
| MEMORIAL PARK CONSERVANCY INC | $22,029,272 | C11 | published | space: outer | Houston, TX | 2024 |
| OMAHA BOTANICAL CENTER INC | $20,686,815 | C11 | published | | Omaha, NE | 2025 |
| PARKS AND WILDLIFE FOUNDATION OF TEXAS INC | $19,863,309 | C11 | published | women: issues | Dallas, TX | 2024 |
| WETLANDS AMERICA TRUST INC | $19,476,047 | C11 | published | | Memphis, TN | 2024 |
| TALL TIMBERS FOUNDATION INC | $13,444,894 | C11 | published | | Tallahassee, FL | 2025 |
| CONSERVATION CORPS | $12,250,281 | C11 | published | science: research education | Saint Paul, MN | 2025 |
| GREATER DES MOINES BOTANICAL GARDEN | $11,844,203 | C11 | published | science: research education | Des Moines, IA | 2024 |
| RIVERSIDE PARK CONSERVANCY INC | $10,916,117 | C11 | published | | New York, NY | 2024 |
| SAVE OSWIT CANYON INC | $8,858,133 | C11 | published | | Palm Springs, CA | 2024 |
| MONTANA LAND RELIANCE FOUNDATION | $8,591,284 | C11 | published | | Helena, MT | 2025 |
| URBAN ECOLOGY CENTER INC | $8,370,353 | C11 | published | science: research education | Milwaukee, WI | 2024 |
| ARBORETUM FOUNDATION | $7,864,410 | C11 | published | | Seattle, WA | 2024 |
| KOHLER TR FOR CLEAN WATER | $7,518,647 | C11 | published | | Kohler, WI | 2025 |
| DENVER BOTANIC GARDENS ENDOWMENT INC | $7,517,439 | C11 | published | | Denver, CO | 2024 |
| DIAMOND BAR CONSERVATION | $6,560,188 | C11 | published | | San Antonio, TX | 2024 |
| FREDERIK MEIJER GARDENS AND SCULPTURE FOUNDATION | $5,673,899 | C11 | published | | Grand Rapids, MI | 2024 |
| BLUE RIDGE PARKWAY FOUNDATION | $5,473,623 | C11 | published | | Winston Salem, NC | 2025 |
| POPULACE INC | $5,084,899 | C11 | published | science: research education | Cambridge, MA | 2024 |
| AFRICAN COMMUNITY AND CONSERVATION FOUNDATION INC | $4,908,394 | C11 | published | | Palm Beach, FL | 2025 |
| FRIENDS OF THE CONSERVATORY | $4,894,914 | C11 | published | | Columbus, OH | 2024 |
| MEMPHIS BOTANIC GARDEN FOUNDATION INC | $4,766,975 | C11 | published | | Memphis, TN | 2024 |
| FRIENDS OF THE PUBLIC GARDEN INC | $4,740,745 | C11 | published | | Boston, MA | 2025 |
| FRIENDS OF SCHLITZ-AUDUBON CENTER INC | $4,631,339 | C11 | published | survivor: cancer | Milwaukee, WI | 2024 |
| WALNUT CREEK PRESERVE INC | $4,622,060 | C11 | published | | Rutherfordton, NC | 2024 |
| FRIENDS OF THE BOUNDARY WATERS WILDERNESS | $4,376,374 | C11 | published | | Saint Paul, MN | 2024 |
| DALLAS ARBORETUM FOUNDATION | $4,355,142 | C11 | published | | Dallas, TX | 2024 |
| BIRMINGHAM BOTANICAL SOCIETY INC | $3,960,637 | C11 | published | science: research education | Mountain Brk, AL | 2025 |
| GARDEN OF THE GODS FOUNDATION | $3,923,670 | C11 | published | | Colorado Spgs, CO | 2025 |
| AUDUBON NATURE INSTITUTE FOUNDATION | $3,921,234 | C11 | published | | New Orleans, LA | 2024 |
| SOUTH DAKOTA HIGH SCHOOL ACTIVITIES ASSOCIATION | $3,766,006 | C11 | published | | Pierre, SD | 2024 |
| OLBRICH BOTANICAL SOCIETY INC | $3,667,076 | C11 | published | science: research education | Madison, WI | 2024 |
| PERCIVAL LOWELL TRUST UW | $3,644,267 | C11 | published | space: outer | Flagstaff, AZ | 2025 |
| FRIENDS OF THE NATIONAL ARBORETUM INC | $3,080,993 | C11 | published | science: research education | Washington, DC | 2024 |
| HOLLIDAY PARK FOUNDATION INC | $2,740,772 | C11 | published | | Indianapolis, IN | 2024 |
| VALLEY WATER COLLABORATIVE | $2,663,632 | C11 | published | | Modesto, CA | 2025 |
| FOUNDATION FOR PENNSYLVANIAWATERSHEDS | $2,662,310 | C11 | published | science: research education | Johnstown, PA | 2024 |
| ISAAC W BERNHEIM TRUST | $2,620,731 | C11 | published | | Pittsburgh, PA | 2025 |
| FRIENDS OF RYE NATURE CENTER INC | $2,556,673 | C11 | published | science: research education | Rye, NY | 2024 |
| WILDLIFE CONSERVATION INTERNATIONAL | $2,534,990 | C11 | published | | Austin, TX | 2025 |
| SHENANDOAH NATIONAL PARK TRUST | $2,483,944 | C11 | published | science: research education | Charlottesvle, VA | 2024 |
| REGIONAL WATER MANAGEMENT FOUNDATION A SUBSIDIARY OF THE | $2,360,284 | C11 | published | | Aptos, CA | 2024 |
| FRIENDS OF THE COLUMBIA GORGE LAND TRUST | $2,316,627 | C11 | published | | Portland, OR | 2024 |
| ELECTRIC VEHICLE INFRASTRUCTURE TRAINING PROGRAM | $2,286,731 | C11 | published | | Royal Oak, MI | 2023 |
| FRIENDS OF THE MOUNTS BOTANICAL GARDEN INC | $2,266,452 | C11 | published | science: research education | West Palm Bch, FL | 2024 |
| NORTH BRANCH NATURE CENTER INC | $2,146,958 | C11 | published | science: research education | Montpelier, VT | 2024 |
| PATCH OF HEAVEN SANCTUARY INC | $2,132,466 | C11 | published | | Miami, FL | 2024 |
| DSC FOUNDATION INC | $1,866,686 | C11 | published | science: research education | Dallas, TX | 2024 |
| ARBOR DAY IMPACT FUND | $1,709,668 | C11 | published | | Lincoln, NE | 2024 |
| PLANTING FIELDS FOUNDATION | $1,700,881 | C11 | published | | Oyster Bay, NY | 2024 |
| BELLEVUE BOTANICAL GARDEN SOCIETY | $1,689,532 | C11 | published | science: research education | Bellevue, WA | 2024 |
| INTERNATIONAL PHILANTHROPIC INNOVATORS FOUNDATION | $1,681,743 | C11 | published | | New York, NY | 2021 |
| BAYARD CUTTING ARBORETUM ENDOWMENT FUND | $1,623,021 | C11 | published | | Pittsburgh, PA | 2025 |
| BELWIN SUPPORTING FUND | $1,469,679 | C11 | published | | Afton, MN | 2024 |
| KATMAI CONSERVANCY | $1,455,887 | C11 | published | | Anchorage, AK | 2025 |
| EASTERN SIERRA INTERPRETIVE ASSOCIATION | $1,448,747 | C11 | published | | Bishop, CA | 2024 |
| MOLOKAI LAND TRUST | $1,429,563 | C11 | published | | Kaunakakai, HI | 2024 |
| BAYOU BEND GARDENS ENDOWMENT | $1,402,912 | C11 | published | | Houston, TX | 2024 |
| JENKINS ARBORETUM & GARDENS | $1,392,679 | C11 | published | science: research education | Devon, PA | 2025 |
| INSTITUTE FOR ENERGY INNOVATION | $1,353,422 | C11 | published | | Lansing, MI | 2025 |
| SUSTAINING OUR URBAN LANDSCAPE SOUL | $1,335,293 | C11 | published | | New Orleans, LA | 2025 |
| ROUND THE BEND FARM INC | $1,333,257 | C11 | published | | S Dartmouth, MA | 2024 |
| OLBRICH BOTANICAL SOCIETY FOUNDATION INC | $1,244,163 | C11 | published | | Madison, WI | 2024 |
| FRIENDS OF HUNTSVILLE PARKS AND RECREATION | $1,174,020 | C11 | published | space: outer | Huntsville, AL | 2023 |
| WILDLIFE HEALTH CENTER FOUNDATION | $1,136,353 | C11 | published | | Davis, CA | 2024 |
| CYLBURN ARBORETUM FRIENDS INC | $1,105,227 | C11 | published | science: research education | Baltimore, MD | 2025 |
| A M HUNTINGTON TRUST FBO BROOKGREEN GARDENS PV 3584 | $1,073,992 | C11 | published | | Chicago, IL | 2024 |
| ASPEN CENTER FOR ENVIRONMENTAL STUDIES ENDOWMENT FUND INC | $1,039,934 | C11 | published | science: research education | Aspen, CO | 2024 |
| WEYLIN AND ROSELYN ENG FAMILY FOUND ATION | $1,033,964 | C11 | published | | Honolulu, HI | 2025 |
| NATIONAL BONSAI FOUNDATION INCORPORATED | $1,016,266 | C11 | published | | Washington, DC | 2025 |
| FRIENDS OF LAKEWOOD | $1,016,087 | C11 | published | science: research education | Lakewood, WA | 2024 |
| COLORES UNITED | $995,330 | C11 | published | shelter: homeless | Deming, NM | 2023 |
| FRIENDS OF RITTENHOUSE SQUARE | $989,281 | C11 | published | | Philadelphia, PA | 2024 |
| WATERSHED AGRICULTURAL CONSERVATION EASEMENT STEWARDSHIP ENDOWMENT FU | $932,582 | C11 | published | | Walton, NY | 2024 |
| CCC FOUNDATION | $927,329 | C11 | published | women: issues | Sacramento, CA | 2025 |
| SONORAN DESERT CONFERENCE CENTER | $885,612 | C11 | published | | Ajo, AZ | 2024 |
| BENT OF THE RIVER SANCTUARY TR P13210003 | $878,552 | C11 | published | | Chicago, IL | 2025 |
| FALLS OF THE OHIO FOUNDATION INC | $869,761 | C11 | published | | Clarksville, IN | 2025 |
| THE PIEDMONT FOUNDATION | $866,688 | C11 | published | | Warrenton, VA | 2025 |
| PRESERVATION PARKS FOUNDATION | $817,139 | C11 | published | | Sunbury, OH | 2025 |
| WOMENS COUNCIL OF THE DALLAS ARBORETUM & BOTANICAL GARDEN | $796,568 | C11 | published | | Dallas, TX | 2024 |
| DIANE AND TRAM SESSIONS FOUNDATION | $787,075 | C11 | published | | Birmingham, AL | 2024 |
| FRIENDS OF ROBINSON GARDENS INC | $759,856 | C11 | published | science: research education | Beverly Hills, CA | 2024 |
| FLORIDA BOTANICAL GARDENS FOUNDATION INC | $729,397 | C11 | published | | Largo, FL | 2024 |
| FRIENDS OF QUARRY HILL NATURE CENTER INC | $723,384 | C11 | published | science: research education | Rochester, MN | 2024 |
| FRIENDS OF SANDOWAY HOUSE NATURE CENTER INC | $721,905 | C11 | published | science: research education | Delray Beach, FL | 2025 |
| FRIENDS OF AULLWOOD INC | $721,575 | C11 | published | | Dayton, OH | 2024 |
| FRIENDS OF AMY B H GREENWELL ETHNOBOTANICAL GARDEN | $707,537 | C11 | published | girls boys: girl scouts | Captain Cook, HI | 2024 |
| SUSAN ELAINE FOUNDATION INC | $700,667 | C11 | published | | Old Saybrook, CT | 2025 |
| SUSTAINABLE PITTSBURGH | $682,371 | C11 | published | | Pittsburgh, PA | 2025 |
| FRIENDS OF WEHR NATURE CENTER INC | $674,833 | C11 | published | | Franklin, WI | 2024 |
| ALLIANCE FOR FLUSHING MEADOWS CORONA PARK CORPORATION | $643,264 | C11 | published | | Corona, NY | 2024 |
| RICHARD WAINWRIGHT BARBER FARM PRESERVATION TRUST INC | $626,492 | C11 | published | | Salisbury, NC | 2025 |
| MAY ARBORETUM SOCIETY | $625,756 | C11 | published | | Reno, NV | 2025 |
| FRIENDS OF SAN LUIS OBISPO BOTANICAL GARDEN | $615,396 | C11 | published | | Sn Luis Obisp, CA | 2024 |
| METRO NASHVILLE PARKS FOUNDATION | $595,781 | C11 | published | | Nashville, TN | 2025 |
| DAUPHIN ISLAND SEA LAB FOUNDATION INC | $584,206 | C11 | published | science: research education | Mobile, AL | 2024 |