Institutional holders Insiders (Form 4) Congress
% of shares outstanding held
—
Shares held (13F)
21,242,337
Top holders largest 28 of 28 · Δ vs 2025-Q4 # Holder Shares Value % of shares out Δ QoQ 1 1 Edenbrook Capital, LLC 14,664,380 14.7M $23M — — 2 2 RENAISSANCE TECHNOLOGIES LLC 1,605,904 1.6M $2M — TRIM -3% 3 3 Kanen Wealth Management LLC 1,300,388 1.3M $2M — ADD 4% 4 4 VANGUARD CAPITAL MANAGEMENT LLC 1,081,336 1.1M $2M — NEW 5 5 BlackRock, Inc. 639,995 639,995 $991,992 — — 6 6 GEODE CAPITAL MANAGEMENT, LLC 404,806 404,806 $627,600 — — 7 7 P.A.W. CAPITAL CORP 400,000 400,000 $620,000 — — 8 8 ACADIAN ASSET MANAGEMENT LLC 211,619 211,619 $327,000 — TRIM -17% 9 9 VANGUARD FIDUCIARY TRUST CO 202,178 202,178 $313,376 — NEW 10 10 STATE STREET CORP 140,696 140,696 $218,079 — ADD 5% 11 11 Acuitas Investments, LLC 133,702 133,702 $207,238 — NEW 12 12 NORTHERN TRUST CORP 76,029 76,029 $117,845 — — 13 13 DIMENSIONAL FUND ADVISORS LP 66,276 66,276 $102,742 — — 14 14 MARATHON CAPITAL MANAGEMENT 61,500 61,500 $95,325 — — 15 15 BRIDGEWAY CAPITAL MANAGEMENT, LLC 56,828 56,828 $88,083 — — 16 16 GOLDMAN SACHS GROUP INC 47,428 47,428 $73,513 — ADD 6% 17 17 MORGAN STANLEY 33,136 33,136 $51,361 — — 18 18 LPL Financial LLC 31,190 31,190 $48,345 — — 19 19 CHARLES SCHWAB INVESTMENT MANAGEMENT INC 24,313 24,313 $37,685 — — 20 20 Black Diamond Financial, LLC 20,000 20,000 $31,000 — NEW 21 21 CITADEL ADVISORS LLC 16,629 16,629 $25,775 — NEW 22 22 Vanguard Global Advisers, LLC 11,241 11,241 $17,424 — NEW 23 23 Independent Advisor Alliance 10,000 10,000 $15,500 — — 24 24 Tower Research Capital LLC (TRC) 2,091 2,091 $3,241 — ADD 48% 25 25 UBS Group AG 626 626 $970 — ADD 636% 26 26 JPMORGAN CHASE & CO 43 43 $67 — — 27 27 BNP PARIBAS FINANCIAL MARKETS 2 2 $3 — — 28 28 WELLS FARGO & COMPANY/MN 1 1 $1 — —
Rows rank by the value each filer reported — 13F filers price their own positions, so a holder with fewer shares can rank just above one with more.
Holder trends· top 15 holders · shares held over 6 quarters green added · red trimmed6 12 24 Max
Holder 2024-Q4 2025-Q1 2025-Q2 2025-Q3 2025-Q4 2026-Q1 Latest value Edenbrook Capital, LLC 14.6M 14.7M 14.7M 14.7M 14.7M 14.7M $23M RENAISSANCE TECHNOLOGIES LLC 1.8M 1.7M 1.7M 1.7M 1.7M 1.6M $2M Kanen Wealth Management LLC — 499K 692K 1.1M 1.2M 1.3M $2M VANGUARD CAPITAL MANAGEMENT LLC — — — — — 1.1M $2M BlackRock, Inc. 633K 632K 631K 633K 635K 640K $991,992 GEODE CAPITAL MANAGEMENT, LLC 360K 396K 393K 402K 403K 405K $627,600 P.A.W. CAPITAL CORP 400K 400K 400K 400K 400K 400K $620,000 ACADIAN ASSET MANAGEMENT LLC 308K 308K 290K 273K 254K 212K $327,000 VANGUARD FIDUCIARY TRUST CO — — — — — 202K $313,376 STATE STREET CORP 135K 135K 135K 135K 135K 141K $218,079 Acuitas Investments, LLC — — 64K 49K — 134K $207,238 NORTHERN TRUST CORP 79K 79K 79K 77K 76K 76K $117,845 DIMENSIONAL FUND ADVISORS LP 98K 102K 102K 88K 66K 66K $102,742 MARATHON CAPITAL MANAGEMENT 39K 42K 54K 62K 62K 62K $95,325 BRIDGEWAY CAPITAL MANAGEMENT, LLC 126K 57K 57K 57K 57K 57K $88,083
Shares reported each quarter by the largest current holders. Green = added vs the prior filing, red = trimmed, grey = roughly held; a dash is a quarter with no 13F on file (a gap is skipped, not read as an exit). 13F is filed up to 45 days after quarter-end. Up to 40 quarters (10 years) available — use the selector above.
Institutional footprint by quarter reporting 13F holders 114 3 2013-Q1 2026-Q1 2013-Q1 · 3 holders · % suppressed/unavailable 2013-Q2 · 62 holders · % suppressed/unavailable 2013-Q3 · 66 holders · % suppressed/unavailable 2013-Q4 · 79 holders · % suppressed/unavailable 2014-Q1 · 111 holders · % suppressed/unavailable 2014-Q2 · 114 holders · % suppressed/unavailable 2014-Q3 · 97 holders · % suppressed/unavailable 2014-Q4 · 94 holders · % suppressed/unavailable 2015-Q1 · 92 holders · % suppressed/unavailable 2015-Q2 · 102 holders · % suppressed/unavailable 2015-Q3 · 91 holders · % suppressed/unavailable 2015-Q4 · 96 holders · % suppressed/unavailable 2016-Q1 · 97 holders · % suppressed/unavailable 2016-Q2 · 90 holders · % suppressed/unavailable 2016-Q3 · 78 holders · % suppressed/unavailable 2016-Q4 · 80 holders · % suppressed/unavailable 2017-Q1 · 78 holders · % suppressed/unavailable 2017-Q2 · 70 holders · % suppressed/unavailable 2017-Q3 · 64 holders · % suppressed/unavailable 2017-Q4 · 69 holders · % suppressed/unavailable 2018-Q1 · 69 holders · % suppressed/unavailable 2018-Q2 · 63 holders · % suppressed/unavailable 2018-Q3 · 60 holders · % suppressed/unavailable 2018-Q4 · 66 holders · % suppressed/unavailable 2019-Q1 · 81 holders · % suppressed/unavailable 2019-Q2 · 100 holders · % suppressed/unavailable 2019-Q3 · 104 holders · % suppressed/unavailable 2019-Q4 · 97 holders · % suppressed/unavailable 2020-Q1 · 76 holders · % suppressed/unavailable 2020-Q2 · 63 holders · % suppressed/unavailable 2020-Q3 · 52 holders · % suppressed/unavailable 2020-Q4 · 42 holders · % suppressed/unavailable 2021-Q1 · 42 holders · % suppressed/unavailable 2021-Q2 · 44 holders · % suppressed/unavailable 2021-Q3 · 36 holders · % suppressed/unavailable 2021-Q4 · 34 holders · % suppressed/unavailable 2022-Q1 · 31 holders · % suppressed/unavailable 2022-Q2 · 30 holders · % suppressed/unavailable 2022-Q3 · 31 holders · % suppressed/unavailable 2022-Q4 · 29 holders · % suppressed/unavailable 2023-Q1 · 27 holders · % suppressed/unavailable 2023-Q2 · 30 holders · % suppressed/unavailable 2023-Q3 · 29 holders · % suppressed/unavailable 2023-Q4 · 29 holders · % suppressed/unavailable 2024-Q1 · 29 holders · % suppressed/unavailable 2024-Q2 · 29 holders · % suppressed/unavailable 2024-Q3 · 28 holders · % suppressed/unavailable 2024-Q4 · 32 holders · % suppressed/unavailable 2025-Q1 · 33 holders · % suppressed/unavailable 2025-Q2 · 29 holders · % suppressed/unavailable 2025-Q3 · 31 holders · % suppressed/unavailable 2025-Q4 · 26 holders · % suppressed/unavailable 2026-Q1 · 28 holders · % suppressed/unavailable Holder count only — too few computable %-of-shares-outstanding quarters for a % pane. Line breaks are quarters with no 13F record, never interpolated.
Quarter Holders Shares held % shares out Value held 2026-Q1 28 21,242,337 — $33M 2025-Q4 26 21,143,762 — $35M 2025-Q3 31 21,205,671 — $38M 2025-Q2 29 21,186,259 — $46M 2025-Q1 33 20,749,036 — $34M 2024-Q4 32 20,383,578
Short interest has its own tab now — open SI →
Source: SEC Form 13F — every institution manager (≥ $100M in 13F securities) reporting a long US-listed position, across ~10,250 filers over 10 years of history. 13F is long-only, US-listed, filed up to 45 days after quarter-end.
Activists & large holders· Schedule 13D/G beneficial owners · MCHX Activists — 13D, active intent
HOROWITZ RUSSELL C 18.5% NEW SCHEDULE 13D · event 2026-07-01 SEC → 8,813,485 shares
“The information set forth or incorporated in Item 3 and Item 6 is hereby incorporated by reference in its entirety into this Item 4. The Reporting Person acquired beneficial ownership of the Shares as part of the transactions described in Item 3 above. The Reporting Person may in the future take actions with respect to his investment in Marchex as it deems appropriate, including changing his current intentions, with respect to any or all matters required to be disclosed in this Schedule 13D. Fro”
Source: SEC Schedule 13D/13G structured XML. 13D = active intent; 13G filers report passively (Rule 13d-1(b) QII / 13d-1(c) Passive / 13d-1(d) Exempt) and are not activists. Percent and delta are the group aggregate the filing reports. Structured 13D/G coverage begins December 2024 (SEC XML mandate).
