Pfizer Inc.
US ˙ NYSE ˙ US7170811035

SecurityPFE / Pfizer Inc.
InstitutionOppenheimer & Co Inc
Latest Disclosed Ownership831,613 shares
Latest Disclosed Value $ 23,351,693
Oppenheimer & Co Inc reports 19.72% increase in ownership of PFE / Pfizer Inc.

On April 23, 2026 - Oppenheimer & Co Inc filed a 13F-HR form disclosing ownership of 831,613 shares of Pfizer Inc. (US:PFE) valued at $23,351,693 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 694,618 shares of Pfizer Inc.. This represents a change in shares of 19.72% during the quarter. The current value of the position is $21,073,073 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)
2026-04-23 2026-03-31 13F PFIZER COM 717081103 831,613 136,995 19.72 23,352 35.02 0.2844
2026-02-02 2025-12-31 13F PFIZER COM 717081103 694,618 -8,787 -1.25 17,296 -3.50 0.2456
2025-11-06 2025-09-30 13F PFIZER COM 717081103 703,405 61,829 9.64 17,923 15.25 0.2186
2025-07-31 2025-06-30 13F PFIZER COM 717081103 641,576 5,361 0.84 15,552 -3.54 0.2057
2025-04-23 2025-03-31 13F PFIZER COM 717081103 636,215 54,844 9.43 16,122 4.53 0.2434
2025-02-05 2024-12-31 13F PFIZER COM 717081103 581,371 -77,017 -11.70 15,424 -19.05 0.2302
2024-11-05 2024-09-30 13F PFIZER COM 717081103 658,388 53,526 8.85 19,054 12.58 0.2906
2024-08-08 2024-06-30 13F PFIZER COM 717081103 604,862 -2,490 -0.41 16,924 0.42 0.2686
2024-05-07 2024-03-31 13F PFIZER COM 717081103 607,352 96,110 18.80 16,854 14.51 0.2795
2024-02-13 2023-12-31 13F PFIZER COM 717081103 511,242 -138,238 -21.28 14,719 -31.68 0.2705
2023-11-08 2023-09-30 13F PFIZER COM 717081103 649,480 -51,337 -7.33 21,543 -16.19 0.4447
2023-08-03 2023-06-30 13F PFIZER COM 717081103 700,817 16,798 2.46 25,706 -7.89 0.5143
2023-05-10 2023-03-31 13F PFIZER COM 717081103 684,019 30,836 4.72 27,908 -16.62 0.5918
2023-02-08 2022-12-31 13F PFIZER COM 717081103 653,183 -15,586 -2.33 33,469 14.37 0.7619
2022-11-14 2022-09-30 13F PFIZER COM 717081103 668,769 -38,012 -5.38 29,265 -21.03 0.6846
2022-08-08 2022-06-30 13F PFIZER COM 717081103 706,781 -39,917 -5.35 37,057 -4.14 0.7977
2022-05-12 2022-03-31 13F PFIZER COM 717081103 746,698 16,731 2.29 38,657 -10.32 0.6968
2022-02-02 2021-12-31 13F PFIZER COM 717081103 729,967 52,501 7.75 43,104 47.93 0.7536
2021-11-12 2021-09-30 13F PFIZER COM 717081103 677,466 2,647 0.39 29,138 10.26 0.5454
2021-08-03 2021-06-30 13F PFIZER COM 717081103 674,819 20,242 3.09 26,426 11.43 0.4736
2021-05-10 2021-03-31 13F PFIZER COM 717081103 654,577 -9,293 -1.40 23,716 -2.95 0.4733
2021-02-11 2020-12-31 13F PFIZER COM 717081103 663,870 20,758 3.23 24,437 3.54 0.5156
2020-11-13 2020-09-30 13F PFIZER COM 717081103 643,112 -42,762 -6.23 23,602 5.23 0.5905
2020-08-11 2020-06-30 13F PFIZER COM 717081103 685,874 -119,546 -14.84 22,429 -14.68 0.5803
2020-05-08 2020-03-31 13F PFIZER COM 717081103 805,420 35,167 4.57 26,289 -12.89 0.7981
2020-02-07 2019-12-31 13F PFIZER COM 717081103 770,253 14,861 1.97 30,179 11.19 0.7473
2019-10-31 2019-09-30 13F PFIZER COM 717081103 755,392 -6,376 -0.84 27,142 -17.75 0.7395
2019-08-09 2019-06-30 13F PFIZER COM 717081103 761,768 -28,456 -3.60 33,000 -1.67 0.8968
2019-04-24 2019-03-31 13F PFIZER COM 717081103 790,224 22,335 2.91 33,560 0.12 0.8965
2019-01-29 2018-12-31 13F PFIZER COM 717081103 767,889 -15,445 -1.97 33,519 -2.91 1.0479
2018-10-26 2018-09-30 13F PFIZER COM 717081103 783,334 12,229 1.59 34,522 23.40 0.8787
2018-08-10 2018-06-30 13F PFIZER COM 717081103 771,105 49,206 6.82 27,976 9.19 0.7593
2018-05-01 2018-03-31 13F PFIZER COM 717081103 721,899 12,732 1.80 25,621 -0.25 0.6582
2018-02-07 2017-12-31 13F PFIZER COM 717081103 709,167 21,785 3.17 25,686 4.67 0.6612
2017-11-09 2017-09-30 13F PFIZER COM 717081103 687,382 -31,711 -4.41 24,540 1.59 0.6568
2017-08-09 2017-06-30 13F PFIZER COM 717081103 719,093 -31,469 -4.19 24,155 -5.92 0.6659
2017-05-15 2017-03-31 13F PFIZER COM 717081103 750,562 -1,315 -0.17 25,676 5.14 0.7267
2017-02-01 2016-12-31 13F PFIZER COM 717081103 751,877 19,118 2.61 24,421 -1.60 0.7109
2016-11-07 2016-09-30 13F PFIZER COM 717081103 732,759 -30,558 -4.00 24,819 -7.65 0.7236
2016-08-08 2016-06-30 13F PFIZER COM 717081103 763,317 -42,599 -5.29 26,876 12.51 0.8012
2016-04-26 2016-03-31 13F PFIZER COM 717081103 805,916 11,992 1.51 23,888 -6.79 0.7254
2016-02-03 2015-12-31 13F PFIZER COM 717081103 793,924 10,544 1.35 25,628 4.15 0.7625
2015-11-13 2015-09-30 13F PFIZER COM 717081103 783,380 36,596 4.90 24,606 -1.73 0.7475
2015-08-12 2015-06-30 13F PFIZER COM 717081103 746,784 -5,794 -0.77 25,040 -4.36 0.6966
2015-05-08 2015-03-31 13F PFIZER COM 717081103 752,578 -16,807 -2.18 26,182 9.24 0.7128
2015-02-10 2014-12-31 13F PFIZER COM 717081103 769,385 35,724 4.87 23,967 10.47 0.6881
2014-11-12 2014-09-30 13F PFIZER COM 717081103 733,661 -33,721 -4.39 21,695 -4.75 0.6453
2014-08-14 2014-06-30 13F PFIZER COM 717081103 767,382 -43,090 -5.32 22,776 -12.51 0.6853
2014-05-09 2014-03-31 13F PFIZER COM 717081103 810,472 53,027 7.00 26,032 12.20 0.7805
2014-02-12 2013-12-31 13F PFIZER COM 717081103 757,445 -51,080 -6.32 23,201 -0.10 0.7421
2013-11-01 2013-09-30 13F PFIZER COM 717081103 808,525 240 0.03 23,225 2.58 0.8164
2013-08-14 2013-06-30 13F PFIZER COM 717081103 808,285 808,285 22,640 0.8753
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.