Who holds ticker verified against the SEC company list on 2026-09-10 — a reviewed name-and-class mapping row, never an inferred symbol. how tickers are mapped ↗

COSTAR GROUP INC · common stock (filed as COM) · Q1 2026 · 12 members disclosed CSGP ↗
13F filers reporting this class for the quarter ended 2026-03-31; 1–500 of 650 holders are listed, largest first
650
sum of the reported values across every holder; undisclosed values are left out, never counted as zero
$15.3B
holders whose share count rose or who opened the position (new + add), by shares
356
holders absent this quarter after holding last quarter — inferred from absence, not a sale record
138
FILING WINDOW OPEN
Q3 2026 filings are due by 2026-11-16 — figures for that quarter will change; missing filers are not zeros.

Holders — quarter ended 2026-03-31

by reported value · Δ shares vs 2025-12-31Holders rank by reported value. The change kind — new, add, trim or exit — is read from the share count against the prior quarter, never from the reported value.
13F holders of CSGP ranked by reported value, 1–25 of 650 holders
#FilerReported valueSharesΔ sharesChange
1VANGUARD PORTFOLIO MANAGEMENT LLC$1.5B38,234,133—NO PRIOR
2BlackRock, Inc.$1.4B33,808,184−162,442TRIM
3VANGUARD CAPITAL MANAGEMENT LLC$1.1B27,423,903—NO PRIOR
4STATE STREET CORP$752M18,650,975+18,623ADD
5PRINCIPAL FINANCIAL GROUP INC$714M17,696,192+130,118ADD
6BAMCO INC /NY/$658M16,314,175−3,183,924TRIM
7Capital International Investors$626M15,513,753+4,671,743ADD
8BAILLIE GIFFORD & CO$549M13,610,922+677,737ADD
9POLEN CAPITAL MANAGEMENT LLC$507M12,570,368+7,679,432ADD
10GEODE CAPITAL MANAGEMENT, LLC$500M12,448,652+266,485ADD
11AKRE CAPITAL MANAGEMENT LLC$417M10,348,273+730,468ADD
12Janus Henderson Group Ltd.$312M7,724,152+250,772ADD
13Invesco Ltd.$288M7,137,002+1,749,946ADD
14D. E. Shaw & Co., Inc.$238M5,909,623+5,004,135ADD
15MORGAN STANLEY$218M5,412,615+121,479ADD
16Capital Research Global Investors$176M4,373,706−1,193,256TRIM
17BANK OF AMERICA CORP /DE/$144M3,568,107+63,295ADD
18NORTHERN TRUST CORP$138M3,432,231−33,831TRIM
19Meritage Group LP$134M3,329,006+3,329,006NEW
20Amundi$132M3,280,724−833,792TRIM
21Legal & General Group Plc$122M3,025,508+164,208ADD
22BECK MACK & OLIVER LLC$118M2,926,975+702,086ADD
23CHARLES SCHWAB INVESTMENT MANAGEMENT INC$116M2,874,262+211,163ADD
24FMR LLC$114M2,831,524+1,629,371ADD
25Ensign Peak Advisors, Inc$110M2,734,289+2,155,933ADD
Show the top 500 of 650 holders
Truncated by Public Filings. Top 500 of 650 holders shown; the rest are on EDGAR. Method ↗
Newest filing in this build: 2026-07-31. Per-row filing dates are on each receipt.

Congress ↔ notable managers · CSGP

Congress · last 90 days

Buyers
1 Gilbert Ray Cisneros, Jr. D–CA-31 $1K–$15K
Sellers
0 — —

filed 2026-07-31 → 2026-10-29 · statutory ranges

Use of congressional disclosure reports for commercial purposes, credit decisions or solicitation is restricted by 5 U.S.C. §13107(c).

Notable managers · quarter ended 2026-03-31

by shares · $ = value heldNEW + ADD vs TRIM + EXIT, by share count. $ = reported value now, not the change. · COSTAR GROUP INC

Merged timeline of congressional filings and notable-manager moves on CSGP
DateWhoChangeSize
2026-09-10Gilbert Ray Cisneros, Jr. CongressBUY$1K–$15K
2026-05-15Corvex Management 13FNEW+851,734 sh
2026-05-15Gotham Asset Management 13FADD+316,669 sh
2026-05-15Tiger Global Management 13FTRIM−759,109 sh
2026-05-15Third Point 13FEXIT−3,165,000 sh
2026-05-15Viking Global Investors 13FEXIT−1,442,582 sh
2026-05-15Bridgewater Associates 13FEXIT−9,020 sh
2026-05-14Caxton Associates 13FNEW+83,948 sh

8 newest, by filing date · 13F rows are quarter-end snapshots, not trades

A 13F is a quarterly, long-only snapshot filed up to 45 days late — not current holdings. what a 13F covers ↗

13F reports cover LONG positions in Section 13(f) securities (US exchange-traded equities plus reportable options, warrants, certain convertibles) held by managers with at least $100M in such securities — so managers below that threshold are absent entirely. No short positions, no cash, no non-13(f) assets — not a full portfolio, and not a census of institutional ownership.

Positions are quarter-end snapshots filed up to 45 days late — not current holdings: a position may have changed or closed since the quarter ended.

Values are the manager's stated market value at quarter-end in era-dependent units (whole dollars for form versions effective 2023-01-03 onward, thousands before), normalized here to whole dollars; each record notes its original unit.

Affiliated managers may report the same position, so one position can appear under more than one filer.

Positions under confidential treatment may be omitted until a later amendment discloses them.

These are disclosures, not investment advice.