Pfizer Inc.
CL ˙ SNSE ˙ US7170811035
SecurityCL:PFE / Pfizer Inc.
InstitutionBanco Santander, S.A.
Latest Disclosed Ownership1,469,265 shares
Latest Disclosed Value $ 41,256,961
Banco Santander, S.A. reports 11.60% decrease in ownership of PFE / Pfizer Inc.

On May 8, 2026 - Banco Santander, S.A. filed a 13F-HR form disclosing ownership of 1,469,265 shares of Pfizer Inc. (CL:PFE) valued at $41,256,961 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,661,972 shares of Pfizer Inc.. This represents a change in shares of -11.60% during the quarter.

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)
2026-05-08 2026-03-31 13F PFIZER COM 717081103 1,469,265 -192,707 -11.60 41,257 -0.31 0.1949
2026-02-13 2025-12-31 13F PFIZER COM 717081103 1,661,972 -311,163 -15.77 41,383 -17.69 0.3099
2025-11-12 2025-09-30 13F PFIZER COM 717081103 1,973,135 82,854 4.38 50,275 9.72 0.4464
2025-08-01 2025-06-30 13F PFIZER COM 717081103 1,890,281 789,775 71.76 45,820 64.31 0.4351
2025-05-09 2025-03-31 13F PFIZER COM 717081103 1,100,506 87,714 8.66 27,887 3.79 0.3077
2025-02-07 2024-12-31 13F PFIZER COM 717081103 1,012,792 -229,674 -18.49 26,869 -25.27 0.3233
2024-11-12 2024-09-30 13F PFIZER COM 717081103 1,242,466 -3,834 -0.31 35,957 3.11 0.4238
2024-07-29 2024-06-30 13F PFIZER COM 717081103 1,246,300 -27,351 -2.15 34,871 -1.34 0.4322
2024-05-10 2024-03-31 13F PFIZER COM 717081103 1,273,651 18,094 1.44 35,344 -2.22 0.4261
2024-02-09 2023-12-31 13F PFIZER COM 717081103 1,255,557 332,695 36.05 36,147 18.09 0.4272
2023-11-08 2023-09-30 13F PFIZER COM 717081103 922,862 136,510 17.36 30,611 6.13 0.4339
2023-08-14 2023-06-30 13F PFIZER COM 717081103 786,352 103,671 15.19 28,843 3.55 0.3783
2023-05-10 2023-03-31 13F PFIZER COM 717081103 682,681 223,110 48.55 27,853 18.28 0.4169
2023-02-13 2022-12-31 13F PFIZER COM 717081103 459,571 11,016 2.46 23,548 19.97 0.3536
2022-11-08 2022-09-30 13F PFIZER COM 717081103 448,555 -9,085 -1.99 19,629 -18.19 0.2619
2022-07-28 2022-06-30 13F PFIZER COM 717081103 457,640 128,971 39.24 23,994 41.01 0.3198
2022-05-09 2022-03-31 13F PFIZER COM 717081103 328,669 24,907 8.20 17,016 -5.13 0.1827
2022-02-09 2021-12-31 13F PFIZER COM 717081103 303,762 59,239 24.23 17,937 70.54 0.0967
2021-11-08 2021-09-30 13F PFIZER COM 717081103 244,523 -193,160 -44.13 10,518 -38.63 0.0565
2021-07-29 2021-06-30 13F PFIZER COM 717081103 437,683 25,163 6.10 17,139 14.67 0.0957
2021-05-10 2021-03-31 13F PFIZER COM 717081103 412,520 24,564 6.33 14,946 4.66 0.1053
2021-02-12 2020-12-31 13F PFIZER COM 717081103 387,956 -136,770 -26.07 14,281 -25.84 0.1024
2020-11-09 2020-09-30 13F PFIZER COM 717081103 524,726 -7,331 -1.38 19,257 10.68 0.2532
2020-08-05 2020-06-30 13F PFIZER COM 717081103 532,057 221,463 71.30 17,399 71.64 0.2257
2020-05-11 2020-03-31 13F PFIZER COM 717081103 310,594 -11,523 -3.58 10,137 -19.68 0.1161
2020-02-07 2019-12-31 13F PFIZER COM 717081103 322,117 74,561 30.12 12,620 41.89 0.1166
2019-11-06 2019-09-30 13F PFIZER COM 717081103 247,556 -12,725 -4.89 8,894 -21.12 0.0865
2019-08-07 2019-06-30 13F PFIZER COM 717081103 260,281 -20,495 -7.30 11,276 -5.44 0.1144
2019-05-13 2019-03-31 13F PFIZER COM 717081103 280,776 -20,009 -6.65 11,925 -9.18 0.1346
2019-02-12 2018-12-31 13F PFIZER COM 717081103 300,785 -139,594 -31.70 13,130 -32.35 0.1659
2018-11-13 2018-09-30 13F PFIZER COM 717081103 440,379 127,092 40.57 19,408 70.74 0.2215
2018-08-14 2018-06-30 13F PFIZER COM 717081103 313,287 -66,035 -17.41 11,367 -15.56 0.1324
2018-05-14 2018-03-31 13F PFIZER COM 717081103 379,322 -1,346,539 -78.02 13,462 -78.46 0.1575
2018-02-14 2017-12-31 13F PFIZER COM 717081103 1,725,861 1,614,946 1,456.02 62,511 1,482.16 0.8953
2017-11-13 2017-09-30 13F PFIZER COM 717081103 110,915 -56,360 -33.69 3,951 -29.72 0.0652
2017-08-11 2017-06-30 13F PFIZER COM 717081103 167,275 -42,411 -20.23 5,622 -21.62 0.1103
2017-05-12 2017-03-31 13F PFIZER COM 717081103 209,686 -60,768 -22.47 7,173 -12.45 0.1850
2017-02-17 2016-12-31 13F/A-1 PFIZER COM 717081103 270,454 270,454 8,193 0.2159
2017-02-14 2016-12-31 13F PFIZER COM 717081103 270,454 8,193
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.