CSGP options flow: unusual options activity in CoStar Group, Inc.

Updated 28 September 2026, 09:54 ET

Over the last week the tape recorded 10 unusual options prints in CoStar Group, Inc. (CSGP), $537K of tracked premium, leaning bearish. Bullish premium was $149K against $263K bearish; $371K went into calls and $166K into puts, a put call ratio of 0.45. The largest print was $89K of CSGP 15 Jan 2027 $30 puts on 21 September 2026, swept at ask. The last session with prints, 25 September 2026, added 2 prints and $148K of premium. CSGP closed at $28.09 on 25 September 2026, up 0.8%.

This week's unusual flow

Prints from 21 September 2026 to 25 September 2026, 5 sessions. Delayed tier: every print is shown twenty minutes after it executed, and the page is rebuilt after each session.

Net premium is bullish minus bearish premium. The put call ratio is put premium divided by call premium, weighted by money rather than by contract count. Sweeps is the share of prints executed across several exchanges at once. Read the guide: Reading the Pulse.

Largest prints of the week

Size above open interest means the trade opened a position larger than everything that existed in the contract the night before. Above ask and below bid are the most aggressive executions. Read the guide: Size versus open interest.

Where the money is aimed

The most premium, $273K, is aimed at the 19 Jan 2029 expiry; the nearest expiry with unusual prints is 18 Dec 2026.

A print in a contract expiring this week is a view about the next few days, often about a known event; a print months out is a different kind of statement. Read the guide: 0DTE options flow.

The last session, 25 September 2026

Every print in CSGP with its full detail, the live tape, one tap filters and saved screeners: open CSGP in Options Sentiment Screener.

Price

The live quote and the price chart sit beside the ticker's flow in the app: open CSGP in Options Sentiment Screener.

Analysts

The most recent analyst targets on file, from 15 firms, have a median of $35, 24.6% above the last close. The last 90 days brought 4 downgrades.

Calls bought at a strike above the average target are a bet that the analysts are too cautious; puts far below the price in a name they like are protection or a strong disagreement. Read the guide: Reading one ticker's flow.

About CoStar Group, Inc.

Exchange

Nasdaq

Sector

Real Estate

Industry

Business Services

Headquarters

WASHINGTON, Virginia

Website

costargroup.com

CoStar Group, Inc. provides information, analytics, and online marketplace services to commercial real estate, hospitality, residential, and related professionals industries. It offers CoStar Property that provides inventory of office, industrial, retail, multifamily, and student housing properties and land. The company also provides Lease Comps and Analysis, a tool to capture, manage, and maintain lease data; Lease Analysis; Public Record, a searchable database of commercially-zoned parcels.

In the same sector

Flow pages for other Real Estate names in the S&P 500:

WELL Welltower Inc.PLD Prologis, Inc.EQIX Equinix Inc.AMT American Tower Corp.SPG Simon Property Group Inc.DLR Digital Realty Trust, Inc.PSA Public StorageO Realty Income Corp.

Learn

• What unusual options activity means
• Reading one ticker's flow
• Sweeps, blocks and where a trade printed
• Size versus open interest
• Bullish or bearish, how a print's sentiment is inferred
• The conviction score and whale prints