| WOODS HOLE OCEANOGRAPHIC INSTITUTION | $344,338,772 | U21 | published | science: research education | Woods Hole, MA | 2024 |
| MONTEREY BAY AQUARIUM RESEARCH INSTITUTE | $86,286,917 | U21 | inferred 0.70 | science: research education | Moss Landing, CA | 2024 |
| MOTE MARINE LABORATORY | $83,003,369 | U21 | inferred 0.80 | space: outer | Sarasota, FL | 2024 |
| OCEANOGRAPHIC RESEARCH & EXPLORATION FOUNDATION | $33,475,838 | U21 | published | science: research education | Westport, CT | 2024 |
| BIGELOW LABORATORY FOR OCEAN SCIENCES | $29,714,759 | U21 | published | science: research education | East Boothbay, ME | 2024 |
| UNAVCO INC | $18,363,438 | U21 | inferred 0.60 | space: outer | Boulder, CO | 2022 |
| ALTASEA AT THE PORT OF LOS ANGELES | $18,290,896 | U21 | published | girls boys: boys girls clubs | San Pedro, CA | 2024 |
| STROUD WATER RESEARCH CENTER INC | $11,925,322 | U21 | published | | Avondale, PA | 2024 |
| HARBOR BRANCH OCEANOGRAPHIC INSTITUTION FOUNDATION INC | $10,001,591 | U21 | published | science: research education | Vero Beach, FL | 2024 |
| LOGGERHEAD MARINELIFE CENTER INC | $9,435,443 | U21 | published | science: research education | Juno Beach, FL | 2024 |
| SCHMIDT OCEAN INSTITUTE | $9,393,588 | U21 | published | science: research education | Palo Alto, CA | 2024 |
| OCEAN VISIONS INC | $8,313,870 | U21 | published | | Leesburg, VA | 2024 |
| NORTHEASTERN REGIONAL ASSOCIATION OF COASTAL OCEAN OBSERVATION SYSTE | $7,426,193 | U21 | published | science: research education | Portsmouth, NH | 2024 |
| MARINE RESOURCES DEVELOPMENT FOUNDATION | $6,747,764 | U21 | published | space: outer | Key Largo, FL | 2024 |
| MARINE TECHNOLOGY SOCIETY INC | $6,126,460 | U21 | published | launch: religious | Washington, DC | 2024 |
| MARINE SCIENCE FOUNDATION | $5,557,079 | U21 | published | | Stuart, FL | 2025 |
| GREAT LAKES OBSERVING SYSTEM REGIONAL ASSOCIATION | $4,877,735 | U21 | published | science: research education | Ann Arbor, MI | 2024 |
| CARIBBEAN COASTAL OCEAN OBSERVING SYSTEM INC | $4,801,853 | U21 | published | space: outer | Lajas, PR | 2025 |
| PALACIOS MARINE AGRICULTURAL RESEARCH INC | $4,540,495 | U21 | published | | Corp Christi, TX | 2024 |
| OPC FOUNDATION | $4,282,513 | U21 | inferred 0.35 | | Scottsdale, AZ | 2025 |
| GLOUCESTER MARINE GENOMICS INSTITUTE INCORPORATED | $4,255,401 | U21 | published | science: research education | Gloucester, MA | 2025 |
| MOLLUSCAN SCIENCE FOUNDATION INC | $4,141,578 | U21 | published | science: research education | Owings Mills, MD | 2025 |
| FLORIDA OCEANOGRAPHIC SOCIETY INC | $4,017,704 | U21 | published | science: research education | Stuart, FL | 2024 |
| SYLVIA EARLE ALLIANCE MISSION BLUE | $3,865,306 | U21 | published | science: research education | Napa, CA | 2024 |
| THE PERRY INSTITUTE FOR MARINE SCIENCE INC | $3,540,520 | U21 | inferred 0.60 | science: research education | Waitsfield, VT | 2024 |
| THEISS RESEARCH | $3,412,211 | U21 | published | science: research education | La Jolla, CA | 2024 |
| BLACK IN MARINE SCIENCE | $3,222,718 | U21 | published | science: research education | Spokane, WA | 2024 |
| OCEANIC INSTITUTE | $2,976,473 | U21 | inferred 0.60 | | Waimanalo, HI | 2013 |
| MARINE SCIENCE CONSORTIUM INC | $2,795,833 | U21 | inferred 0.70 | science: research education | Wallops Is, VA | 2024 |
| CHARLES F CHAPMAN SCHOOL OF SEAMANSHIP INC | $2,753,275 | U21 | published | | Stuart, FL | 2024 |
| THE GLOBAL FOUNDATION FOR OCEAN EXPLORATION INC | $2,422,237 | U21 | published | science: research education | Old Lyme, CT | 2025 |
| BLUE WORLD RESEARCH INSTITUTE INC | $2,408,496 | U21 | published | | Cocoa, FL | 2024 |
| WORLD AQUACULTURE SOCIETY INC | $2,352,623 | U21 | published | science: research education | Sorrento, LA | 2024 |
| BRISTOL BAY SCIENCE & RESEARCH INSTITUTE | $2,229,399 | U21 | published | science: research education | Dillingham, AK | 2023 |
| PEGGY AND STEVE FOSSETT FOUNDATION | $2,183,269 | U21 | published | | Chicago, IL | 2025 |
| CENTER FOR WHALE RESEARCH | $2,131,035 | U21 | published | | Friday Harbor, WA | 2024 |
| NORTHWEST STRAITS MARINE CONSERVATION FOUNDATION | $2,005,517 | U21 | published | | Bellingham, WA | 2024 |
| MAINE CENTER FOR COASTAL FISHERIES | $1,984,270 | U21 | published | science: research education | Stonington, ME | 2024 |
| GULF OF MAINE LOBSTER FOUNDATION INC | $1,959,108 | U21 | published | science: research education | Kennebunk, ME | 2025 |
| FOUNDATION FOR MARINE ECOLOGY AND TELEMETRY RESEARCH | $1,954,597 | U21 | published | science: research education | Seabeck, WA | 2025 |
| CENTRAL CARIBBEAN MARINE INSTITUTE INC | $1,871,686 | U21 | published | science: research education | Princeton, NJ | 2024 |
| NEPTUNES NAVY INC | $1,828,542 | U21 | published | violence: prevention | New York, NY | 2024 |
| PROJECT CETI INC | $1,804,666 | U21 | published | | New York, NY | 2025 |
| CLIMATE FOUNDATION | $1,748,294 | U21 | published | | Beaverton, OR | 2024 |
| THE WATER COUNCIL INC | $1,686,757 | U21 | published | science: research education | Milwaukee, WI | 2025 |
| MARINE APPLIED RESEARCH AND EXPLORATION | $1,657,451 | U21 | published | science: research education | Blue Lake, CA | 2024 |
| CAPTAIN PAUL WATSON FOUNDATION | $1,652,146 | U21 | published | violence: prevention | Lewes, DE | 2024 |
| SOCIETY FOR MARINE MAMALOGY | $1,627,711 | U21 | published | | Mt Royal, NJ | 2024 |
| ATLANTIC WHITE SHARK CONSERVANCY INC | $1,621,119 | U21 | published | science: research education | Chatham, MA | 2025 |
| INTER DISTRICT COMMITTEE FOR PROJECT OCEANOLOGY | $1,496,245 | U21 | published | science: research education | Groton, CT | 2024 |
| SCIENTIFIC COMMITTEE ON OCEANIC RESEARCH | $1,418,560 | U21 | published | space: outer | Newark, DE | 2024 |
| PACIFIC SHELLFISH INSTITUTE | $1,291,767 | U21 | published | | Olympia, WA | 2024 |
| RESPONSIBLE OFFSHORE SCIENCE ALLIANCE | $1,283,365 | U21 | published | | Washington, DC | 2025 |
| PORT TOWNSEND MARINE SCIENCE CENTER | $909,740 | U21 | published | science: research education | Port Townsend, WA | 2024 |
| OCEANS FOR YOUTH FOUNDATION | $907,048 | U21 | published | | Augusta, GA | 2025 |
| OCEANS INITIATIVE | $864,560 | U21 | published | women: issues | Seattle, WA | 2024 |
| OCEAN DISCOVERY LEAGUE INC | $815,470 | U21 | published | science: research education | Saunderstown, RI | 2025 |
| AMERICAN SALTWATER GUIDES ASSOCIATION INC | $802,482 | U21 | published | | Washington, DC | 2024 |
| WORLD OCEAN COUNCIL | $721,867 | U21 | published | | Vienna, VA | 2024 |
| BIMINI BIOLOGICAL FIELD STATION FOUNDATION INC | $686,535 | U21 | published | science: research education | Hollywood, FL | 2025 |
| OCEAN RESCUE ALLIANCE INC | $664,417 | U21 | published | | Apollo Beach, FL | 2024 |
| ALGALITA MARINE RESEARCH AND EDUCATION | $622,663 | U21 | published | science: research education | Long Beach, CA | 2025 |
| OCEANOGRAPHY SOCIETY | $582,517 | U21 | inferred 0.60 | science: research education | Rockville, MD | 2024 |
| SAVING THE BLUE INC | $524,718 | U21 | published | science: research education | Davie, FL | 2025 |
| SHARK RESEARCH FOUNDATION INC | $515,316 | U21 | published | | Canada | 2025 |
| REEFS UNKNOWN INC | $507,852 | U21 | published | science: research education | Charlotte Amalie, VI | 2024 |
| FINS ATTACHED MARINE RESEARCH AND CONSERVATION | $495,722 | U21 | published | | Colorado Spgs, CO | 2024 |
| LAHAINA YACHT CLUB | $366,646 | U21 | inferred 0.55 | | Lahaina, HI | 2025 |
| COASTAL EDUCATION AND RESEARCH FOUNDATION INC | $353,018 | U21 | inferred 0.60 | science: research education | Charlotte, NC | 2024 |
| CLEAN OCEANS PROJECT | $341,442 | U21 | published | | Santa Cruz, CA | 2024 |
| FOMARES INC | $306,272 | U21 | published | | Houston, TX | 2025 |
| ROCKY MOUNTAIN ASSOCIATION OF GEOLOGISTS FOUNDATION | $301,492 | U21 | inferred 0.50 | | Denver, CO | 2025 |
| OCEAN CONSERVATION INTERNATIONAL INC | $296,637 | U21 | published | | Dover, DE | 2025 |
| OCEAN ALLIANCE PROJECT | $292,064 | U21 | published | | Honolulu, HI | 2025 |
| FRIENDS OF TURNEFFE ATOLL INC | $291,908 | U21 | published | science: research education | Bozeman, MT | 2024 |
| THE WASHINGTON DC AREA MARINE AQUARIST SOCIETY | $281,664 | U21 | published | science: research education | Reston, VA | 2015 |
| PACIFICO PLATFORM INC | $280,440 | U21 | published | | Miami, FL | 2025 |
| MARINE LIFE STUDIES | $277,116 | U21 | published | girls boys: girl scouts | Moss Landing, CA | 2025 |
| CALIFORNIA OCEAN ALLIANCE | $267,850 | U21 | published | | Aptos, CA | 2024 |
| SOUTH RIVER WATERSHED ALLIANCE | $243,751 | U21 | published | | Decatur, GA | 2024 |
| SEA RESEARCH SOCIETY | $242,750 | U21 | inferred 0.50 | science: research education | Irmo, SC | 2019 |
| OCTO | $215,773 | U21 | published | | Woodinville, WA | 2024 |
| TEXAS MARINE MAMMAL STRANDING NETWORK | $207,480 | U21 | published | | Galveston, TX | 2024 |
| NATIONAL ASSOCIATION OF MARINE LABORATORIES INC | $205,584 | U21 | published | science: research education | Herndon, VA | 2024 |
| DIVING WITH A PURPOSE AND DEVELOPMENT GROUP INC | $199,932 | U21 | published | | Nashville, TN | 2024 |
| ATLANTIC SHARK INSTITUTE | $164,394 | U21 | published | | Wakefield, RI | 2024 |
| RECLAM THE BAY INC | $160,105 | U21 | published | | Toms River, NJ | 2025 |
| FLORIDA OCEAN ALLIANCE INC | $156,534 | U21 | published | | Ft Lauderdale, FL | 2025 |
| RV PILAR INC | $152,317 | U21 | published | | San Diego, CA | 2025 |
| MEDICAL FOUNDATION FOR THE STDY OF THE ENVIR & HUM BDY CHAR TR 060789 | $151,865 | U21 | published | | Kaneohe, HI | 2024 |
| ASCC EDUCATION RESEARCH & DEVELOPMENT FOUNDATION | $133,902 | U21 | inferred 0.55 | science: research education | Sappington, MO | 2024 |
| EXPLORING OUR DEEP WORLD INC | $119,882 | U21 | published | science: research education | Miami, FL | 2024 |
| ENDICOTT-REARDON FAMILY MUSEUM A NJ NONPROFIT CORPORATION | $117,538 | U21 | published | | Ocean View, NJ | 2025 |
| CRUSTACEAN SOCIETY | $113,483 | U21 | published | | Herndon, VA | 2024 |
| ASSOCIATION FOR MARINE EXPLORATION | $103,286 | U21 | published | science: research education | Honolulu, HI | 2022 |
| NELSON R BEIDEMAN CENTER FOR RESILIENT FISHERIES INC | $86,260 | U21 | published | science: research education | Forked River, NJ | 2019 |
| EASTERN PACIFIC OCEAN CONFERENCE | $85,350 | U21 | published | science: research education | Seattle, WA | 2025 |
| AMERICAN ELASMOBRANCH SOCIETY | $81,490 | U21 | published | science: research education | Bradenton, FL | 2025 |
| FLORIDA MANTA PROJECT INC | $78,586 | U21 | published | science: research education | Lk Worth Bch, FL | 2025 |
| BAHAMAS SPORTFISHING & CONSERVATION CORPORATION | $78,493 | U21 | published | | Grapevine, TX | 2015 |