Pfizer Inc.
US ˙ NYSE ˙ US7170811035

SecurityPFE / Pfizer Inc.
InstitutionClaro Advisors LLC
Latest Disclosed Ownership46,859 shares
Latest Disclosed Value $ 1,315,811
Claro Advisors LLC ownership in PFE / Pfizer Inc.

On April 21, 2026 - Claro Advisors LLC filed a 13F-HR form disclosing ownership of 46,859 shares of Pfizer Inc. (US:PFE) valued at $1,315,801 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 47,111 shares of Pfizer Inc.. This represents a change in shares of -0.53% during the quarter. The current value of the position is $1,187,407 USD.

Claro Advisors LLC has a history of taking positions in derivatives of the underlying security (PFE) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

PFE / Pfizer Inc. Historical Put/Call Ratio
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)
2026-04-21 2026-03-31 13F PFIZER COM 717081103 46,859 -252 -0.53 1,316 12.11 0.1585
2026-02-17 2025-12-31 13F PFIZER COM 717081103 47,111 -848 -1.77 1,173 -3.93 0.1598
2025-11-12 2025-09-30 13F PFIZER COM 717081103 47,959 -2,148 -4.29 1,222 0.58 0.1782
2025-08-05 2025-06-30 13F PFIZER COM 717081103 50,107 -7,957 -13.70 1,215 -17.47 0.2005
2025-05-12 2025-03-31 13F PFIZER COM 717081103 58,064 6,651 12.94 1,471 7.92 0.1969
2025-01-13 2024-12-31 13F PFIZER COM 717081103 51,413 9,651 23.11 1,364 12.83 0.1843
2024-11-07 2024-09-30 13F/A-1 PFIZER COM 717081103 41,762 879 2.15 1,209 5.69 0.1562
2024-10-17 2024-09-30 13F PFIZER COM 717081103 2,546 -38,337 249 0.0322
2024-07-31 2024-06-30 13F PFIZER COM 717081103 40,883 1,355 3.43 1,144 4.29 0.1786
2024-04-18 2024-03-31 13F PFIZER COM 717081103 39,528 456 1.17 1,097 -2.49 0.1905
2024-01-22 2023-12-31 13F PFIZER COM 717081103 39,072 -14,704 -27.34 1,125 -36.96 0.2436
2023-10-10 2023-09-30 13F PFIZER COM 717081103 53,776 -4,982 -8.48 1,784 -17.26 0.4459
2023-08-08 2023-06-30 13F PFIZER COM 717081103 58,758 -976 -1.63 2,155 -11.57 0.5354
2023-04-17 2023-03-31 13F PFIZER COM 717081103 59,734 1,713 2.95 2,437 -18.00 0.7156
2023-03-13 2022-12-31 13F/A-1 PFIZER COM 717081103 58,021 3,806 7.02 2,973 4.57 0.9726
2023-02-14 2022-12-31 13F PFIZER COM 717081103 58,021 3,806 2,973 0.9707
2022-11-18 2022-09-30 13F/A-1 PFIZER COM 717081103 54,215 0 0.00 2,842 0.00 1.1297
2022-11-14 2022-09-30 13F PFIZER COM 717081103 54,215 0 2,842 1.1297
2022-08-12 2022-06-30 13F PFIZER COM 717081103 54,215 97 0.18 2,842 -11.08 1.1297
2022-05-16 2022-03-31 13F PFIZER COM 717081103 54,118 0 0.00 3,196 0.00 1.1497
2022-02-14 2021-12-31 13F PFIZER COM 717081103 54,118 382 0.71 3,196 38.30 1.1498
2021-11-15 2021-09-30 13F PFIZER COM 717081103 53,736 594 1.12 2,311 11.05 0.9719
2021-08-13 2021-06-30 13F PFIZER COM 717081103 53,142 -568 -1.06 2,081 6.94 0.9366
2021-05-17 2021-03-31 13F PFIZER COM 717081103 53,710 677 1.28 1,946 -0.31 0.9858
2021-02-12 2020-12-31 13F PFIZER COM 717081103 53,033 -6,278 -10.58 1,952 -10.34 1.0375
2020-11-16 2020-09-30 13F PFIZER COM 717081103 59,311 808 1.38 2,177 13.80 1.3796
2020-08-14 2020-06-30 13F PFIZER COM 717081103 58,503 626 1.08 1,913 1.27 1.3166
2020-05-15 2020-03-31 13F PFIZER COM 717081103 57,877 1,004 1.77 1,889 -15.22 1.7609
2020-02-14 2019-12-31 13F PFIZER COM 717081103 56,873 -18 -0.03 2,228 9.00 1.7151
2019-10-29 2019-09-30 13F PFIZER COM 717081103 56,891 -113 -0.20 2,044 -17.21 1.8133
2019-07-24 2019-06-30 13F PFIZER COM 717081103 57,004 784 1.39 2,469 3.39 2.2790
2019-05-10 2019-03-31 13F PFIZER COM 717081103 56,220 6,696 13.52 2,388 9.39 2.3631
2019-02-14 2018-12-31 13F PFIZER COM 717081103 49,524 49,524 2,183 1.7475
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2019-05-09 2019-03-31 13F PFIZER COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2019-02-14 2018-12-31 13F PFIZER COM Call 1,000 1 n/a n/a n/a
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.