2026-03-11T06:30:02-07:00 2025-11-30 591951801 Natherson & Company PA 1801 Glengary Street Floor 2 Sarasota FL 34231 990PF 2024-12-01 650764285 The Koski Family Foundation Inc KOSK 9145524560 4995 Ashley Parkway Sarasota FL 34241 Thomas L Koski President 2026-03-09 true true Patrick L Gallagher CPA P00044586 9419231881 2024 2025-03-06 01:10:19Z X 9757482 X X 7238 7238 34274 34274 2127613 3823498 2127613 562 562 2169687 2169687 4500 79005 79005 2694 438 438 86637 79443 0 437062 437062 523699 79443 437062 1645988 2090244 40664 26408 26408 166268 1679870 1679870 2609286 2531598 7551870 485250 709580 499334 3301468 4947456 9757482 0 X 3301468 4947456 3301468 4947456 3301468 4947456 3301468 1645988 4947456 4947456 6062 Shares Wisdomtree Treasury ETF P 2024-03-21 2024-12-13 305333 305884 -551 -551 6400 Shares Unity Software, Inc. P 2023-12-01 2024-12-27 152724 196042 -43318 -43318 491 Shares Intuit, Inc P 2020-03-24 2025-02-05 293189 107943 185246 185246 1764 Shares Centrus energy Corp P 2020-09-03 2025-02-11 200261 18889 181372 181372 490 Shares Intuit, Inc P 2020-03-24 2025-03-04 298481 107723 190758 190758 4450 Shares RX Sight Inc P 2024-02-22 2025-04-15 63915 248131 -184216 -184216 1709 Shares Globant, Inc. P 2019-03-18 2025-05-19 168058 121368 46690 46690 1400 Shares Centrus energy Corp P 2020-09-03 2025-05-29 185359 14991 170368 170368 7945 Shares Samsara, Inc. P 2024-08-01 2025-06-30 318241 303975 14266 14266 3000 shares Centrus energy Corp P 2020-09-03 2025-07-22 712431 32124 680307 680307 711 Shares EPam Systems P 2017-03-31 2025-08-14 113091 25708 87383 87383 2100 Shares Centrus energy Corp P 2020-09-03 2025-10-17 898423 22487 875936 875936 17974 Shares ASP Isotopes, Inc. P 2025-07-28 2025-11-28 110201 190620 -80419 -80419 K-1 LTCG Clearwater Capital Partners III P 2022-06-30 2024-12-31 3791 3791 3791 2127613 -66704 29054 29054 29054 32500 32500 X 161 3285 3285 false false false false false false false true true FL true false false false false true N/A Natherson & Company PA 9419231881 1801 Glengary Street Floor 2 Sarasota FL 34231 false false false false false false false false false false false false false false false false false false false false false false Gregory C Yadley Esq 101 E Kennedy Blvd Ste 2800 Tampa FL 33602 Director 0.00 0 Beverly L Koski 5135 Willow Leaf Drive Sarasota FL 34241 Vice President 0.00 0 Robert C Koski 7305 Crape Myrtle Way Sarasota FL 34241 Treasurer 0.00 0 Christine L Koski 3525 Turtle Creek Blvd 19B Dallas TX 75219 Director 0.00 0 Thomas L Koski 4995 Ashley Parkway Sarasota FL 34241 President 0.00 0 NONE NONE This foundation is not a private operating foundation. Its sole charitable activity is to make contributions to public charitable organizations exempt from Federal income tax under Section 501(c)(3) of the Internal Revenue Code. 0 7388439 937506 0 8325945 0 8325945 124889 8201056 410053 410053 29054 29054 380999 380999 380999 437062 437062 380999 134718 29079 65798 44837 13060 287492 437062 0 380999 56063 343555 0 134718 208837 29079 65798 44837 13060 56063 Beverly L Koski X The Hermitage Artist Retreat 6660 Manasota Key Rd Englewood FL 34223 None PC Support The Hermitage Artist Retreat - underwrite two Kennedy Center residences $20,000Collabrative Initiative $30,000 50000 Sarasota Orchestra 709 N Tamiami Trail Sarasota FL 34236 None PC Support 2025 Sarasota Youth Persons Concerts 25000 WEDU 1888 Brother Geenen Way Sarasota FL 34236 None PC PBS Education Outreach 10000 Selby Botanical Gardens 811 S Palm Ave Sarasota FL 34236 None PC Third year of three year pledge--Education and Outreach 25000 Colgate University 13 Oak Dr Hamilton NY 13346 None PC Support Colgate University scholarships 5000 Dartmouth College 6016 McNutt Hall Hanover NH 03755 None PC Support Dartmouth scholarships 10000 St Lawrence University 23 Romoda Dr Canton NY 13617 None PC Support St. Lawrence University scholarships 15000 Educational Foundation of Sarasota 1960 Landings Blvd Sarasota FL 34231 None PC Third year of three year Pledge--Student Success Program 40000 University of South Florida Foundat 4202 E Fowler Ave Tampa FL 33620 None PC Third Year of Five year pledge--Engineering 2+2 Program 20000 Pines of Sarasota 1501 N Orange Avenue Sarasota FL 34236 None PC Second of three year pledge PCA & CAN Educational Program 15000 Mote Marine 1600 Ken Thompson Pkwy Sarasota FL 34236 None PC Second of two year pledge--Mote Marine Creation of Teacher Development 21000 Ohio Weslyan University 61 S Sandusky St Delaware OH 43015 None PC Support Ohio Wesleyan University Department of Education, Middle Childhood Licensure Program 5000 Ringling College of Art Design 2700 N Tamiami Trail Sarasota FL 34234 None PC For the support of Youth Experiencing Art and the education and Koski Scholarship Fund 50000 Suncoast Science Center Inc 4452 S Beneva Road Sarasota FL 34233 None PC Second year of two year pledge--Student Proposals and Education Committee 20000 Project 180 PO Box 25684 Sarasota FL 34277 None PC Strong voices Lecture Series $5,000;First Week Out $5,000; Residential $10,000 20000 Boys Girls Club of Sarasota 3130 Fruitville Road Sarasota FL 34237 None PC Great Futures Summer Academy 25000 Library Foundation of Sarasota Coun PO Box 2526 Sarasota FL 34230 None PC Purchaase of one year subscription to ABC Mouse Home Access for Libraries 15762 Take Stock In Children PO Box 48186 Sarasota FL 34231 None PC Support Mentoring and Purchase of One STARS Prepaid College scholarship 10000 The Florida Orchestra 244 2nd Ave N 420 St Petersburg FL 33701 None PC Second year of two year pledge--Community Outreach 5000 Easter Seals Southwest Florida 350 Braden Ave Sarasota FL 34243 None PC Support Easter Seals Academy 10000 Big Waters Land Trust 400 Palmetto Ave Osprey FL 34229 None PC Support of Youth Education Program 15000 American Society of Mechanical Engi Two Park Avenue Suite 1600 New York NY 10016 None PC Wine Sponsorship for Koski Medal Diner 300 All Faiths Food Bank 8171 Blaikie Court Sarasota FL 34240 None PC Support Mission during Government Shutdown 10000 University of South Florida WSMR 4202 E Fowler Ave Tampa FL 33620 First year of 5 year pledge of $75,000 for classical Music for Everyone 15000 437062 14 7238 14 34274 18 2127613 Other portfolio income 14 562 2169687 2169687 false false false false false false false false false false Natherson & Company 4500 0 0 0 Epam Systems Inc. Air Industries 90000 3130 Meta Platforms, Inc fka Facebook 94663 633695 JP Morgan Chase 334625 1030972 NVDIA 168956 2240820 Globant SA Centrus Energy Corp 53622 1298574 IMPAC Mortgage 42820 4994 Intuit, Inc. Pure Storage 298520 857485 Amazon 476719 539438 RX Sight, Inc. Samsara, Inc Unity Software, Inc ASP Isotopes, Inc. 180290 105740 Blackrock, Inc 381875 378075 Cisco Systems 409508 458947 Clearwater Capital Partners L.P. AT COST 57100 21520 Clearwater ICPL CoInvestment Fund AT COST Bioventrix Series B Preferred AT COST 128500 100 Wisdom Tree ETF AT COST I shares Bitcoin ETF AT COST 523980 477714 Clearwater Capital III, LP K-1 378 378 Clearwater ICPL, LP K-1 60 60 Other portfolio income 562 Sara-Bay Financial Advisors 79005 79005 0 0 Federal 990PF Payments 2633 Florida corp Annual Report Fee 61