Pfizer Inc.
US ˙ NYSE ˙ US7170811035

SecurityPFE / Pfizer Inc.
InstitutionDeerfield Management Company, L.p. (series C)
Latest Disclosed Ownership3,040,000 shares
Latest Disclosed Value $ 85,363,200
Deerfield Management Company, L.p. (series C) ownership in PFE / Pfizer Inc.

On May 15, 2026 - Deerfield Management Company, L.p. (series C) filed a 13F-HR form disclosing ownership of 3,040,000 shares of Pfizer Inc. (US:PFE) valued at $85,363,200 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 0 shares of Pfizer Inc.. The current value of the position is $77,033,600 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F PFIZER COM 717081103 3,040,000 3,040,000 85,363 1.0071
2026-02-17 2025-12-31 13F PFIZER COM 717081103 0 -3,303,790 -100.00 0 -100.00
2025-11-14 2025-09-30 13F PFIZER COM 717081103 3,303,790 -1,002,474 -23.28 84,181 -19.35 1.2851
2025-08-14 2025-06-30 13F PFIZER COM 717081103 4,306,264 958,968 28.65 104,384 23.06 1.8945
2025-05-15 2025-03-31 13F PFIZER COM 717081103 3,347,296 3,347,296 84,820 1.6747
2016-08-15 2016-06-30 13F PFIZER COM 717081103 0 -25,000 -100.00 0 -100.00
2016-05-16 2016-03-31 13F PFIZER COM 717081103 25,000 25,000 -98.61 741 -98.57 0.0315
2014-02-14 2013-12-31 13F PFIZER COM 717081103 0 -1,805,000 -100.00 0 -100.00
2013-11-14 2013-09-30 13F PFIZER COM 717081103 1,805,000 -50,000 -2.70 51,849 -0.21 2.4116
2013-08-14 2013-06-30 13F PFIZER COM 717081103 1,855,000 1,855,000 51,959 2.4490
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.