Harbor Advisors LLC

Position in CSGP — Costar Group, Inc.

CIK 1687156 West Palm Beach, FL

Position in CSGP

as of Jun 30, 2026 · filed Jul 28, 2026 Compact

Position Value

$752,179

-$319,251 QoQ

Shares Held

26,560

0.0% QoQ

Ownership

0.007%

of shares outstanding

% of Portfolio

0.10%

of 13F equity value

Holder Rank

#339

of 747 holders

Holding Since

Mar 2020

26 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Real Estate · as of Jun 30, 2026

Harbor Advisors LLC holds $1,870,269 across 3 Real Estate Services names. CSGP ranks #2 (40.2% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	CBRE	Cbre Group, Inc.	6,000	$808,140
2	CSGP	Costar Group, Inc. This page	26,560	$752,179
3	JLL	Jones Lang Lasalle Inc	1,000	$309,950

26 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$752,179	26,560	0.0%	Shares	Sole	2026-07-28
2026-03-31	$1,071,430	26,560	0.0%	Shares	Sole	2026-05-07
2025-12-31	$1,785,894	26,560	+17.7%	Shares	Sole	2026-01-30
2025-09-30	$1,903,387	22,560	0.0%	Shares	Sole	2025-11-12
2025-06-30	$1,813,824	22,560	0.0%	Shares	Sole	2025-08-13
2025-03-31	$1,787,428	22,560	0.0%	Shares	Sole	2025-05-15
2024-12-31	$1,615,070	22,560	+12.5%	Shares	Sole	2025-02-11
2024-09-30	$1,513,326	20,060	+17.6%	Shares	Sole	2024-11-14
2024-06-30	$1,264,828	17,060	0.0%	Shares	Sole	2024-07-30
2024-03-31	$1,647,996	17,060	0.0%	Shares	Sole	2024-05-01
2023-12-31	$1,490,873	17,060	+69.6%	Shares	Sole	2024-02-01
2023-09-30	$773,513	10,060	0.0%	Shares	Sole	2023-11-07
2023-06-30	$895,340	10,060	0.0%	Shares	Sole	2023-08-15
2023-03-31	$692,631	10,060	0.0%	Shares	Sole	2023-05-11
2022-12-31	$777,436	10,060	0.0%	Shares	Sole	2023-02-13
2022-09-30	$700,679	10,060	0.0%	Shares	Sole	2022-11-07
2022-06-30	$607,724	10,060	0.0%	Shares	Sole	2022-08-05
2022-03-31	$670,096	10,060	0.0%	Shares	Sole	2022-05-16
2021-12-31	$795,041	10,060	0.0%	Shares	Sole	2022-02-14
2021-09-30	$865,763	10,060	0.0%	Shares	Sole	2021-10-29
2021-06-30	$833,169	10,060	+900.0%	Shares	Sole	2021-08-03
2021-03-31	$826,821	1,006	0.0%	Shares	Sole	2021-05-04
2020-12-31	$929,825	1,006	0.0%	Shares	Sole	2021-02-11
2020-09-30	$853,601	1,006	0.0%	Shares	Sole	2020-11-09
2020-06-30	$714,934	1,006	0.0%	Shares	Sole	2020-08-03
2020-03-31	$590,733	1,006	—	Shares	Sole	2020-05-21
No filing history on record for this holder in this stock.