2026-05-13T13:44:20-05:00 2025-06-30 946214841 ARMANINO ADVISORY LLC 2700 CAMINO RAMON STE 350 SAN RAMON CA 945835004 990 2024-07-01 942427732 MARIN HORIZON SCHOOL INC MARI 4153888408 305 MONTFORD AVENUE MILL VALLEY CA 94941 DEREK DETTORRE DIR OF FINANCE AND OPERATIONS 4153888408 2026-05-12 1 1 KATY BROWN P00650274 9257902600 2026-05-12 2024 2025-03-06 01:10:19Z DEREK DETTORRE 305 MONTFORD AVENUE MILL VALLEY CA 94941 18621721 0 X WWW.MARINHORIZON.ORG X 1977 CA THE ORGANIZATION IS A MONTESSORI-INSPIRED, NON-PROFIT INDEPENDENT, CO-EDUCATIONAL SCHOOL SERVING CLOSE TO 300 CHILDREN FROM PRESCHOOL THROUGH 8TH GRADE FOUNDED IN 1977 BY A VISIONARY GROUP OF PARENTS AND TEACHERS, THE SCHOOL'S MISSION IS TO CHALLENGE STUDENTS TO BE SELF-RELIANT THINKERS AND LIFELONG LEARNERS, INSPIRE ACADEMIC EXCELLENCE, NURTURE STUDENTS' NATURAL LOVE OF LEARNING, AND ENCOURAGE THEM TO BE CONFIDENT INDIVIDUALS WHO ARE RESPONSIBLE TO EACH OTHER, THE COMMUNITY AND THE WORLD. THE SCHOOL IS GOVERNED BY A VOLUNTEER BOARD OF TRUSTEES COMPRISED OF PARENTS, FACULTY, ALUMNI, AND COMMUNITY MEMBERS. 20 17 142 156 0 0 3882955 3717245 11831230 12280239 333634 721719 181790 122959 16229609 16842162 2639920 2575275 0 0 7639301 8292581 10511 19661 417977 3580745 3645127 13870477 14532644 2359132 2309518 46353722 49507150 26460471 26810511 19893251 22696639 WE GROUND STUDENTS IN A DEEP SENSE OF BELONGING SO THEY BECOME ENTHUSIASTIC LEARNERS, DEVELOP CONFIDENT VOICES, AND EMERGE AS BEACONS OF KINDNESS IN THEIR COMMUNITIES. 0 0 12260038 2575275 12308707 MARIN HORIZON SCHOOL IS AN INDEPENDENT, COED DAY SCHOOL FOR STUDENTS IN TODDLER THROUGH GRADE 8. LOCATED IN MILL VALLEY, CALIFORNIA, OUR CURRICULUM IS DESIGNED TO INSPIRE STUDENTS TO EMBRACE CHALLENGES, THINK CRITICALLY, AND BECOME COMPASSIONATE ADVOCATES. WE PRIORITIZE CLASS SIZES TO ALLOW THE DEVELOPMENT OF EXCEPTIONAL TEACHER-STUDENT RELATIONSHIPS AND INDIVIDUALIZED ATTENTION. WITHIN OUR INCLUSIVE COMMUNITY, EVERY STUDENT IS SEEN, HEARD, AND VALUED, FOSTERING A SENSE OF OWNERSHIP OVER THEIR EDUCATION AND AN EXPLORATION OF THEIR UNIQUE INTERESTS. 12260038 1 1 0 0 0 0 0 0 0 1 1 1 0 1 1 1 1 0 1 0 0 0 0 1 1 0 0 0 1 1 1 0 0 0 0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 0 1 49 0 1 142 1 0 0 0 0 0 1 1 0 0 0 0 0 0 X 20 17 0 0 0 0 0 0 0 1 1 0 0 1 1 1 1 1 1 1 0 0 CA X X DEREK DETTORRE 4153888408 305 MONTFORD AVENUE MILL VALLEY CA 94941 BILL PERRINE HEAD OF SCHOOL 40.00 X X 301946 0 128001 JESSE PEARSON 7/8TH LANG TEACHER, TRUSTEE 40.00 X 102804 0 24934 KELLEY GALLARDO PRIMARY TEACHER, TRUSTEE 40.00 X 79346 0 24730 PETER BRYAN CHAIR 4.00 X X 0 0 0 JEN COYNE VICE-CHAIR 4.00 X X 0 0 0 ROHIT AGARWAL SECRETARY 1.00 X X 0 0 0 RYAN STEVER TREASURER 1.00 X X 0 0 0 ANDY DAVIES TRUSTEE 1.00 X 0 0 0 BRETT FOLEY TRUSTEE 1.00 X 0 0 0 ASHLEY GOLDSMITH BUTTNER TRUSTEE 1.00 X 0 0 0 CHARMAINE HO TRUSTEE 1.00 X 0 0 0 MIRA KIM TRUSTEE 1.00 X 0 0 0 KRISTIN LUNNY TRUSTEE 1.00 X 0 0 0 LEXY LURIE TRUSTEE 1.00 X 0 0 0 ASHLEY MACDONALD TRUSTEE 1.00 X 0 0 0 TRIGG MCLEOD TRUSTEE 1.00 X 0 0 0 TATEM READ TRUSTEE 1.00 X 0 0 0 ELISABETH THURSTON FRASER TRUSTEE 1.00 X 0 0 0 ROSAMOND POPE-MEYER TRUSTEE 1.00 X 0 0 0 KATHRYN THOMPSON TRUSTEE 1.00 X 0 0 0 DIANA GREENSTONE DIRECTOR OF FINANCE 40.00 X 177000 0 27531 BEN FUSSINER DIRECTOR OF UPPER SCHOOL 40.00 X 113761 0 41472 KATHLEEN HAZELTON-LEECH PRIMARY TEACHER 40.00 X 130300 0 24457 MARY BISHOP DIRECTOR OF DEVELOPMENT 40.00 X 128986 0 21838 VICTORIA HUERTA-MILLER DIRECTOR OF LOWER SCHOOL 40.00 X 117847 0 15794 ELIZABETH KEY DIRECTOR OF ADMISSIONS 40.00 X 109692 0 13670 1261682 0 322427 15 0 1 0 BIC CONSTRUCTION INC 110 TIBURON BLVD STE 5 MILL VALLEY CA 94941 HORIZON COMMUNITY SCHOOL CONSTRUCTION 612590 CITY WIDE FACILITY SOLUTIONS NORTH BAY 1400 N DUTTON AVE STE 9 SANTA ROSA CA 95401 JANITORIAL SERVICES 126512 2 108727 1274923 2333595 243259 3717245 TUITION AND ENROLLMENT 611110 11575149 11575149 DAYCARE SERVICES 611110 373138 373138 ENRICHMENT CLASSES 611110 179982 179982 SUMMER SCHOOL 611110 151970 151970 12280239 513008 513008 75381 21398 53983 53983 53983 1913252 1157 1705698 0 207554 1157 208711 208711 92971 108727 52463 40508 40508 BUS RIDER INCOME 611110 21580 21580 MISCELLANEOUS 611110 6888 6888 28468 16842162 12308707 0 816210 2575275 2575275 946487 578155 294003 74329 5779804 4870501 728208 181095 233801 195341 30772 7688 779253 667538 89412 22303 553236 446894 85085 21257 1517 1517 97200 97200 19661 19661 54623 54623 53813 45496 7586 731 83848 83848 148395 6136 142011 248 90573 72718 14427 3428 984767 943708 37888 3171 168811 168577 187 47 277328 264487 11759 1082 729441 698630 28216 2595 128348 8237 120111 EDUCATION 589724 589718 5 1 DEVELOPMENT 150219 42107 27771 80341 SUMMER CAMP 56609 56609 SPECIAL EVENTS 17060 17060 12851 12851 14532644 12260038 1854629 417977 3072735 3200728 500274 2386996 1069812 748615 4517624 4714870 74221 242436 29415077 9782261 19053585 19632816 12909226 13641167 5156245 4939522 46353722 49507150 1073752 1346251 8680636 9557910 9120635 8706724 1234463 1182528 6350985 6017098 26460471 26810511 X 14719321 16020614 5173930 6676025 19893251 22696639 46353722 49507150 2309518 493870 0 X 0 1 X 1 0 X RESTRICTED RESTRICTED RESTRICTED RESTRICTED RESTRICTED RESTRICTED RESTRICTED RESTRICTED 6521505 31100 658433 7211038 5745342 38207 737956 6521505 4111597 1119111 514634 5745342 4192345 3180 300714 384642 4111597 4185845 6500 872205 755650 116555 4192345 0.77090 0.13420 0.09490 0 0 25008136 8326277 16681859 1411970 466493 945477 2152803 711252 1441551 842168 278239 563929 19632816 MARKETABLE SECURITIES 13641167 F 13641167 RIGHT-OF-USE ASSETS 4939522 4939522 CAPITAL DEPOSITS 745377 LEASE LIABILITIES 5271721 6017098 X 14738809 493870 32675 526545 14212264 54623 2575275 2629898 16842162 11935421 32675 32675 11902746 54623 2575275 2629898 14532644 PART X, LINE 2: THE SCHOOL IS A QUALIFIED ORGANIZATION EXEMPT FROM FEDERAL INCOME AND CALIFORNIA FRANCHISE TAXES UNDER THE PROVISIONS OF SECTIONS 501(C)(3) OF THE INTERNAL REVENUE CODE ("IRC") AND 23701(D) OF THE CALIFORNIA REVENUE AND TAXATION CODE, RESPECTIVELY. THE SCHOOL HAS EVALUATED ITS CURRENT TAX POSITIONS AND HAS CONCLUDED THAT AS OF JUNE 30, 2025, THE SCHOOL DOES NOT HAVE ANY SIGNIFICANT UNCERTAIN TAX POSITIONS FOR WHICH A RESERVE WOULD BE NECESSARY. PART XI, LINE 2D - OTHER ADJUSTMENTS: RENTAL EXPENSES 21,398. TUITION ASSISTANCE EXPENSES MOVED TO REVENUE 11,277. PART XI, LINE 4B - OTHER ADJUSTMENTS: TUITION ASSISTANCE 2,575,275. PART XII, LINE 2D - OTHER ADJUSTMENTS: RENTAL EXPENSES 21,398. TUITION ASSISTANCE EXPENSES MOVED TO REVENUE 11,277. PART XII, LINE 4B - OTHER ADJUSTMENTS: TUITION ASSISTANCE 2,575,275. 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 0 1 SCHEDULE E, PART I, LINE 3 THE SCHOOL'S POLICY IS TO INCLUDE THE RACIALLY NONDISCRIMINATORY STATEMENT IN AN AD AT LEAST ONCE PER YEAR, INCLUDING ENROLLMENT AND ADMISSIONS FORMS. THE STATEMENT IS AS FOLLOWS: "IN ITS ADMISSIONS POLICIES, MARIN HORIZON SCHOOL DOES NOT DISCRIMINATE ON THE BASIS OF RACE, RELIGION, NATIONALITY, ETHNIC ORIGIN OR PHYSICAL HANDICAP". THE SCHOOL'S POLICY IS ALSO LISTED ON THE HOMEPAGE OF THEIR WEBSITE AT ALL TIMES. SCHEDULE E, PART I, LINE 6 THE ORGANIZATION RECEIVED PASS-THROUGH GRANTS FROM SAUSALITO MARIN CITY SCHOOL DISTRICT. X X X X X X 1 SK WALLIS CONSULTING LLC 29 HILLCREST CT SAN ANSELMO CA 94960 FOUNDATION GRANTS AND REPORTING CONSULTANT 0 100000 12191 87809 FRANCO FINN PRODUCTIONS LLC 1483 FUNSTON AVENUE SAN FRANCISCO CA 94122 AUCTIONEER 0 34100 6000 28100 134100 18191 115909 SPRING AUCTION 201698 108727 92971 17000 7284 7280 20899 201698 108727 92971 17000 7284 7280 20899 52463 40508 1 TUITION ASSISTANCE TO ATTEND MARIN HORIZON SCHOOL 87 2575275 FMV TUITION ASSISTANCE TO ATTEND MARIN HORIZON SCHOOL PART I, LINE 2: THE SCHOOL REQUIRES THAT EACH YEAR PARENTS APPLYING FOR FINANCIAL AID COMPLETE AN APPLICATION THROUGH CLARITY FINANCIAL AID AND GIVE CLARITY PERMISSION TO PULL SUPPORTING TAX DOCUMENTS FROM THE IRS TO DEMONSTRATE FINANCIAL NEED. BASED ON THE APPLICATION AND SUPPORTING TAX DOCUMENTS, CLARITY PROVIDES AN OBJECTIVE ANALYSIS OF EACH FAMILY'S FINANCIAL INFORMATION TO GUIDE THE SCHOOL'S INDEXED TUITION COMMITTEE IN DETERMINING HOW MUCH A FAMILY CAN AFFORD TO PAY TOWARDS SCHOOL COSTS. X X 1 1 X X X X 0 0 0 0 0 0 0 0 0 BILL PERRINE HEAD OF SCHOOL 301946 0 0 0 0 0 16393 0 111608 0 429947 0 0 0 DIANA GREENSTONE DIRECTOR OF FINANCE 177000 0 0 0 0 0 8845 0 18686 0 204531 0 0 0 BEN FUSSINER DIRECTOR OF UPPER SCHOOL 113761 0 0 0 0 0 7049 0 34423 0 155233 0 0 0 KATHLEEN HAZELTON-LEECH PRIMARY TEACHER 130300 0 0 0 0 0 6555 0 17902 0 154757 0 0 0 MARY BISHOP DIRECTOR OF DEVELOPMENT 128986 0 0 0 0 0 6729 0 15109 0 150824 0 0 0 PART I, LINE 1A THE SCHOOL PROVIDES HOUSEKEEPING AND HOUSING AS IT IS A CONDITION OF EMPLOYMENT FOR THE HEAD OF SCHOOL. A CALIFORNIA ENTERPRISE DEVELOPMENT AUTHORITY 2020-09-25 4553823 REFINANCE OF PRIOR TAX-EXEMPT BOND 0 0 0 B CALIFORNIA MUNICIPAL FINANCE AUTHORITY 2020-09-25 7489642 REFINANCE OF PRIOR TAX-EXEMPT BOND 0 0 0 A 1880182 4553823 4553823 2045 0 0 0 0 B 1418170 7489642 7489642 2040 0 0 0 0 A 0 0 0 0 0 0 0 B 0 0 0 0 0 0 0 A 0 0 1 0 0 0 0 0 0 B 0 0 1 0 0 0 0 0 0 A 0 B 0 30072 TUITION ASSIS 45910 TUITION ASSIS 27562 TUITION ASSIS 27208 TUITION ASSIS 31073 TUITION ASSIS X 10 241299 FMV X SPECIAL EVENT GIFT & TICKETS 1 1960 0 0 1 0 PART I, COLUMN (B): THIS NUMBER REPRESENTS THE NUMBER OF CONTRIBUTIONS, NOT THE NUMBER OF ITEMS CONTRIBUTED. FORM 990, PART VI, SECTION B, LINE 11B A COPY OF FORM 990 WAS SENT TO CFO AND HEAD OF SCHOOL FOR REVIEWING AND PRESENTING TO THE FULL BOARD BEFORE IT WAS FILED WITH THE IRS. DONOR INFORMATION WAS NOT PRESENTED TO FULL BOARD. FORM 990, PART VI, SECTION B, LINE 12C ALL BOARD MEMBERS ARE REQUIRED TO DISCLOSE ANY POTENTIAL CONFLICT OF INTEREST AND ANNUALLY SIGN A WRITTEN STATEMENT. FORM 990, PART VI, SECTION B, LINE 15A THE BOARD OF TRUSTEES HIRED AN INDEPENDENT SEARCH CONSULTANT TO HIRE A PERMANENT HEAD OF SCHOOL. SALARY COMPENSATION IS BASED ON LOCAL COMPENSATION STUDIES. FORM 990, PART VI, SECTION C, LINE 19 PROVIDED UPON REQUEST.