This page tracks how heavily Pfizer Inc. (NYSE:PFE) is being shorted: ORTEX's daily short interest estimate, the cost to borrow the shares, utilization of the lendable supply and days to cover, next to the official exchange-reported figure.

Short interest: The number of shares that have been sold short and not yet bought back, usually shown as a percentage of free float (the shares available to trade). ORTEX estimates it every day from securities-lending data, instead of waiting for exchange reports that are published only twice a month and about two weeks late.
Cost to borrow: The annualised fee a short seller pays to borrow the shares, as a percentage of the position's value. A rising cost to borrow means lendable shares are getting scarce and holding the short is getting more expensive.
Utilization: The share of the lendable supply of a stock that is currently on loan. Close to 100% means almost no shares are left to borrow.
Days to cover: Short interest divided by average daily trading volume: roughly how many days of normal trading it would take for every short seller to buy back their shares.
Exchange-reported short interest: The official figure published by the exchange or regulator (in the US, FINRA twice a month). It is accurate but delayed, which is the gap the ORTEX daily and intraday estimates fill.

Source: ORTEX. Some figures are limited on the free view; live data and full history are part of ORTEX Advanced.

PFE key data

Pfizer Inc. (NYSE: PFE) has a market capitalization of $170.99B. Last close $30.00 (as of 2026-11-04); 52-week range $23.62 to $31.06. ORTEX data as of 2026-11-03: short interest is 2.38% of free float, 4.2 days to cover and the average cost to borrow is 0.45%.

Latest on PFE

Jul 25, 2026Analysts Trim Targets as Pfizer Approaches Q2 Print

All PFE news on ORTEX News

Pfizer Inc. (PFE) Short Interest

NYSE • PFE • US7170811035

Ex-dividend 06 Nov · 0.43 USD (special)

30.00Last close

Market Closed

Ex-dividend 06 Nov · 0.43 USD (special)

As of Nov 3, 2026, ORTEX estimates 2.4% of free float is sold short, 4.2 days to cover, cost to borrow 0.45%.

About this data: PFE short interest, cost to borrow and days to cover

Short interest: The number of shares that have been sold short and not yet bought back, usually shown as a percentage of free float (the shares available to trade). ORTEX estimates it every day from securities-lending data, instead of waiting for exchange reports that are published only twice a month and about two weeks late.
Cost to borrow: The annualised fee a short seller pays to borrow the shares, as a percentage of the position's value. A rising cost to borrow means lendable shares are getting scarce and holding the short is getting more expensive.
Utilization: The share of the lendable supply of a stock that is currently on loan. Close to 100% means almost no shares are left to borrow.
Days to cover: Short interest divided by average daily trading volume: roughly how many days of normal trading it would take for every short seller to buy back their shares.
Exchange-reported short interest: The official figure published by the exchange or regulator (in the US, FINRA twice a month). It is accurate but delayed, which is the gap the ORTEX daily and intraday estimates fill.

Source: ORTEX. Some figures are limited on the free view; live data and full history are part of ORTEX Advanced.

PFE key data

Latest on PFE

Jul 25, 2026Analysts Trim Targets as Pfizer Approaches Q2 Print

All PFE news on ORTEX News