Granahan Investment Management, LLC

Position in CSGP — Costar Group, Inc.

CIK 1026710 WALTHAM, MA

Position in CSGP

as of Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$6,496,635

+$315,330 QoQ

Shares Held

161,047

+75.2% QoQ

Ownership

0.039%

of shares outstanding

% of Portfolio

0.31%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

25 quarters on record

Voting authority Sole 71% Shared 0% None 29%

Real Estate · as of Mar 31, 2026

Granahan Investment Management, LLC holds $20,278,265 across 2 Real Estate Services names. CSGP ranks #2 (32.0% of the industry book) .

#	Ticker	Company	Shares	Value (USD)	Open
1	COMP	Compass, Inc.	1,885,312	$13,781,630
2	CSGP	Costar Group, Inc. This page	161,047	$6,496,635

25 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$6,496,635	161,047	+75.2%	Shares	Sole	2026-05-15
2025-12-31	$6,181,305	91,929	-66.0%	Shares	Sole	2026-02-17
2025-09-30	$22,793,905	270,166	-10.2%	Shares	Sole	2025-11-14
2025-06-30	$24,194,932	300,932	-13.4%	Shares	Sole	2025-08-14
2025-03-31	$27,547,716	347,693	-2.9%	Shares	Sole	2025-05-15
2024-12-31	$25,643,967	358,206	-1.4%	Shares	Sole	2025-02-14
2024-09-30	$27,409,766	363,332	-14.2%	Shares	Sole	2024-11-14
2024-06-30	$31,392,803	423,426	-30.7%	Shares	Sole	2024-08-14
2024-03-31	$59,022,406	610,998	-14.2%	Shares	Sole	2024-05-15
2023-12-31	$62,229,020	712,084	-6.9%	Shares	Sole	2024-02-14
2023-09-30	$58,831,153	765,134	-3.3%	Shares	Sole	2023-11-14
2023-06-30	$70,440,652	791,468	-0.4%	Shares	Sole	2023-08-14
2023-03-31	$54,731,825	794,943	-41.8%	Shares	Sole	2023-05-15
2022-12-31	$105,631,095	1,366,862	-9.6%	Shares	Sole	2023-02-14
2022-09-30	$105,326,610	1,512,227	-12.0%	Shares	Sole	2022-11-14
2022-06-30	$103,787,460	1,718,051	-9.5%	Shares	Sole	2022-08-15
2022-03-31	$126,463,681	1,898,569	+47.2%	Shares	Sole	2022-05-16
2021-12-31	$101,963,636	1,290,189	-3.8%	Shares	Sole	2022-02-14
2021-09-30	$115,411,021	1,341,053	-1.1%	Shares	Sole	2021-11-15
2021-06-30	$112,339,532	1,356,430	+878.2%	Shares	Sole	2021-08-16
2021-03-31	$11,396,984	138,668	+12.1%	Shares	Sole	2021-05-17
2020-12-31	$11,428,814	123,651	+11.4%	Shares	Sole	2021-02-12
2020-09-30	$9,421,939	111,041	-3.6%	Shares	Sole	2020-11-12
2020-06-30	$8,185,639	115,182	+1.0%	Shares	Sole	2020-08-14
2020-03-31	$6,699,361	114,088	—	Shares	Sole	2020-05-12
No filing history on record for this holder in this stock.