Pfizer Inc.
CL ˙ SNSE ˙ US7170811035
SecurityCL:PFE / Pfizer Inc.
InstitutionCss Llc/il
Latest Disclosed Ownership37,121 shares
Latest Disclosed Value $ 1,042,358
Css Llc/il ownership in PFE / Pfizer Inc.

On May 15, 2026 - Css Llc/il filed a 13F-HR form disclosing ownership of 37,121 shares of Pfizer Inc. (CL:PFE) valued at $1,042,358 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 42,171 shares of Pfizer Inc.. This represents a change in shares of -11.98% during the quarter.

Css Llc/il 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 and put 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.

CL: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)
2026-05-15 2026-03-31 13F PFIZER COM 717081103 37,121 -5,050 -11.98 1,042 -0.76 0.0499
2026-02-17 2025-12-31 13F PFIZER COM 717081103 42,171 30,921 274.85 1,050 267.13 0.0467
2025-11-13 2025-09-30 13F PFIZER COM 717081103 11,250 -23,530 -67.65 287 -66.07 0.0129
2025-08-14 2025-06-30 13F PFIZER COM 717081103 34,780 -16,780 -32.54 843 -35.45 0.0393
2025-05-15 2025-03-31 13F PFIZER COM 717081103 51,560 20,701 67.08 1,307 59.66 0.0717
2025-02-18 2024-12-31 13F PFIZER COM 717081103 30,859 -2,240 -6.77 819 -14.52 0.0361
2024-11-14 2024-09-30 13F PFIZER COM 717081103 33,099 17,100 106.88 958 114.09 0.0438
2024-08-14 2024-06-30 13F PFIZER COM 717081103 15,999 -4,000 -20.00 448 -19.31 0.0229
2024-05-15 2024-03-31 13F PFIZER COM 717081103 19,999 -9,000 -31.04 555 -33.57 0.0320
2024-02-14 2023-12-31 13F PFIZER COM 717081103 28,999 -14,000 -32.56 835 -41.51 0.0482
2023-11-14 2023-09-30 13F PFIZER COM 717081103 42,999 10,000 30.30 1,426 17.85 0.0936
2023-08-14 2023-06-30 13F PFIZER COM 717081103 32,999 9,100 38.08 1,210 24.10 0.0749
2023-05-15 2023-03-31 13F PFIZER COM 717081103 23,899 8,000 50.32 975 19.78 0.0644
2023-02-14 2022-12-31 13F PFIZER COM 717081103 15,899 0 0.00 815 16.95 0.0461
2022-11-14 2022-09-30 13F PFIZER COM 717081103 15,899 5,399 51.42 696 26.32 0.0327
2022-08-15 2022-06-30 13F PFIZER COM 717081103 10,500 -1,500 -12.50 551 -11.41 0.0225
2022-05-16 2022-03-31 13F PFIZER COM 717081103 12,000 2,000 20.00 622 5.42 0.0225
2022-02-14 2021-12-31 13F PFIZER COM 717081103 10,000 8,000 400.00 590 586.05 0.0210
2021-11-15 2021-09-30 13F PFIZER COM 717081103 2,000 2,000 86 0.0037
2020-11-16 2020-09-30 13F PFIZER COM 717081103 0 -50,918 -100.00 0 -100.00
2020-08-14 2020-06-30 13F PFIZER COM 717081103 50,918 50,918 1,665 0.0943
2016-05-16 2016-03-31 13F PFIZER COM 717081103 0 0 0 0.0000
2016-02-16 2015-12-31 13F PFIZER COM 717081103 0 0 0 0.0000
2015-11-16 2015-09-30 13F PFIZER COM 717081103 0 -15,485 -100.00 0 -100.00
2015-08-14 2015-06-30 13F PFIZER COM 717081103 15,485 0 0.00 519 -3.71 0.0242
2015-05-15 2015-03-31 13F PFIZER COM 717081103 15,485 0 0.00 539 11.83 0.0274
2015-02-17 2014-12-31 13F PFIZER COM 717081103 15,485 0 0.00 482 5.24 0.0239
2014-11-14 2014-09-30 13F PFIZER COM 717081103 15,485 0 0.00 458 -0.43 0.0222
2014-08-14 2014-06-30 13F PFIZER COM 717081103 15,485 0 0.00 460 -7.44 0.0191
2014-05-15 2014-03-31 13F PFIZER COM 717081103 15,485 0 0.00 497 4.85 0.0251
2014-02-14 2013-12-31 13F PFIZER COM 717081103 15,485 15,485 474 0.0227
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
(%)
2026-02-17 2025-12-31 13F PFIZER COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-11-13 2025-09-30 13F PFIZER COM Call 30,000 0.00 764 5.09 n/a n/a n/a
2025-08-14 2025-06-30 13F PFIZER COM Call 30,000 0.00 727 -4.34 n/a n/a n/a
2025-05-15 2025-03-31 13F PFIZER COM Call 30,000 760 n/a n/a n/a
2025-02-18 2024-12-31 13F PFIZER COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2024-11-14 2024-09-30 13F PFIZER COM Call 20,000 -33.33 579 -31.11 n/a n/a n/a
2024-08-14 2024-06-30 13F PFIZER COM Call 30,000 0.00 839 0.84 n/a n/a n/a
2024-05-15 2024-03-31 13F PFIZER COM Call 30,000 832 n/a n/a n/a
2023-11-14 2023-09-30 13F PFIZER COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2023-08-14 2023-06-30 13F PFIZER COM Call 10,100 370 n/a n/a n/a
2022-02-14 2021-12-31 13F PFIZER COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2021-11-15 2021-09-30 13F PFIZER COM Call 25,000 1,075 n/a n/a n/a
2021-02-16 2020-12-31 13F PFIZER COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2020-11-16 2020-09-30 13F PFIZER COM Call 46,300 -56.07 1,699 -50.71 n/a n/a n/a
2020-08-14 2020-06-30 13F PFIZER COM Call 105,400 3,447 n/a n/a n/a
Disclosed Put 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
(%)
2022-11-14 2022-09-30 13F PFIZER COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2022-08-15 2022-06-30 13F PFIZER COM Put 20,000 -50.00 1,049 -49.32 n/a n/a n/a
2022-05-16 2022-03-31 13F PFIZER COM Put 40,000 -27.27 2,070 -36.27 n/a n/a n/a
2022-02-14 2021-12-31 13F PFIZER COM Put 55,000 120.00 3,248 202.14 n/a n/a n/a
2021-11-15 2021-09-30 13F PFIZER COM Put 25,000 1,075 n/a n/a n/a
2021-02-16 2020-12-31 13F PFIZER COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2020-11-16 2020-09-30 13F PFIZER COM Put 46,300 -17.17 1,699 -7.06 n/a n/a n/a
2020-08-14 2020-06-30 13F PFIZER COM Put 55,900 1,828 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.