Sealed Air Corporation
US ˙ NYSE ˙ US81211K1007
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT

SecuritySEE / Sealed Air Corporation
InstitutionSimplex Trading, Llc
Latest Disclosed Ownership1,079 shares
Latest Disclosed Value $ 45,371
Simplex Trading, Llc ownership in SEE / Sealed Air Corporation

On May 14, 2026 - Simplex Trading, Llc filed a 13F-HR form disclosing ownership of 1,079 shares of Sealed Air Corporation (US:SEE) valued at $45,372 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 7,678 shares of Sealed Air Corporation. This represents a change in shares of -85.95% during the quarter. The current value of the position is $0 USD.

Simplex Trading, Llc has a history of taking positions in derivatives of the underlying security (SEE) in the form of stock options. The firm currently holds call options representing 85,100 of underlying shares valued at $3,578,454 USD and put options representing 1,300 of underlying shares valued at $54,665 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.

SEE / Sealed Air Corporation 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)
2026-05-14 2026-03-31 13F SEALED AIR CORP COM 81211K100 1,079 -6,599 -85.95 45 -85.85 0.0000
2026-02-11 2025-12-31 13F SEALED AIR CORP COM 81211K100 7,678 7,678 318 0.0002
2025-02-11 2024-12-31 13F SEALED AIR CORP COM 81211K100 0 -3,578 -100.00 0 0.0000
2024-11-08 2024-09-30 13F SEALED AIR CORP COM 81211K100 3,578 3,578 0 0.0001
2024-07-25 2024-06-30 13F SEALED AIR CORP COM 81211K100 0 -274 -100.00 0 0.0000
2024-04-25 2024-03-31 13F SEALED AIR CORP COM 81211K100 274 274 0 0.0000
2024-02-02 2023-12-31 13F SEALED AIR CORP COM 81211K100 0 -34,164 -100.00 0 -100.00
2023-11-01 2023-09-30 13F SEALED AIR CORP COM 81211K100 34,164 30,306 785.54 1 0.0009
2023-08-04 2023-06-30 13F SEALED AIR CORP COM 81211K100 3,858 3,858 0 0.0001
2022-11-04 2022-09-30 13F SEALED AIR CORP COM 81211K100 0 -684 -100.00 0 -100.00
2022-08-03 2022-06-30 13F SEALED AIR CORP COM 81211K100 684 684 39 0.0000
2020-07-13 2020-06-30 13F SEALED AIR CORP COM 81211K100 0 -3,262 -100.00 0 -100.00
2020-04-29 2020-03-31 13F SEALED AIR CORP COM 81211K100 3,262 76 2.39 80 -36.51 0.0001
2020-02-05 2019-12-31 13F SEALED AIR CORP COM 81211K100 3,186 3,186 -2.33 126 57.50 0.0003
2019-07-26 2019-06-30 13F SEALED AIR CORP COM 81211K100 0 -17,548 -100.00 0 -100.00
2019-04-18 2019-03-31 13F SEALED AIR CORP COM 81211K100 17,548 6,020 52.22 808 101.50 0.0022
2019-01-16 2018-12-31 13F SEALED AIR CORP COM 81211K100 11,528 11,528 -34.31 401 -50.37 0.0012
2018-10-23 2018-09-30 13F SEALED AIR CORP COM 81211K100 0 -3,044 -100.00 0 -100.00
2018-07-30 2018-06-30 13F SEALED AIR CORP COM 81211K100 3,044 3,044 129 0.0005
2018-04-26 2018-03-31 13F SEALED AIR CORP COM 81211K100 0 -656 -100.00 0 -100.00
2018-01-10 2017-12-31 13F SEALED AIR CORP COM 81211K100 656 656 32 0.0014
2017-01-11 2016-12-31 13F SEALED AIR CORP COM 81211K100 0 -1,654 -100.00 0 -100.00
2016-10-07 2016-09-30 13F SEALED AIR CORP COM 81211K100 1,654 811 96.20 75 97.37 0.0051
2016-07-18 2016-06-30 13F SEALED AIR CORP COM 81211K100 843 843 -49.03 38 -49.33 0.0025
2016-04-14 2016-03-31 13F SEALED AIR CORP COM 81211K100 0 -2,036 -100.00 0 -100.00
2016-01-20 2015-12-31 13F SEALED AIR CORP COM 81211K100 2,036 -3,675 -64.35 90 -66.29 0.0070
2015-10-08 2015-09-30 13F SEALED AIR CORP COM 81211K100 5,711 -4,463 -43.87 267 -48.85 0.0196
2015-07-08 2015-06-30 13F SEALED AIR CORP COM 81211K100 10,174 4,895 92.73 522 117.50 0.0437
2015-04-21 2015-03-31 13F SEALED AIR CORP COM 81211K100 5,279 5,279 240 0.0279
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
(%)
2026-05-14 2026-03-31 13F SEALED AIR CORP CALL Call 85,100 -8.40 3,578 -7.02 n/a n/a n/a
2026-02-11 2025-12-31 13F SEALED AIR CORP CALL Call 92,900 255.94 3,849 n/a n/a n/a
2025-11-12 2025-09-30 13F SEALED AIR CORP CALL Call 26,100 335.00 1 n/a n/a n/a
2025-08-05 2025-06-30 13F SEALED AIR CORP CALL Call 6,000 -88.83 0 -100.00 n/a n/a n/a
2025-05-12 2025-03-31 13F SEALED AIR CORP CALL Call 53,700 74.92 2 0.00 n/a n/a n/a
2025-02-11 2024-12-31 13F SEALED AIR CORP CALL Call 30,700 -16.58 1 0.00 n/a n/a n/a
2024-11-08 2024-09-30 13F SEALED AIR CORP CALL Call 36,800 -9.36 1 0.00 n/a n/a n/a
2024-07-25 2024-06-30 13F SEALED AIR CORP CALL Call 40,600 -54.84 1 -66.67 n/a n/a n/a
2024-04-25 2024-03-31 13F SEALED AIR CORP CALL Call 89,900 -21.21 3 -25.00 n/a n/a n/a
2024-02-02 2023-12-31 13F SEALED AIR CORP CALL Call 114,100 -17.50 4 0.00 n/a n/a n/a
2023-11-01 2023-09-30 13F SEALED AIR CORP CALL Call 138,300 147.41 5 100.00 n/a n/a n/a
2023-08-04 2023-06-30 13F SEALED AIR CORP CALL Call 55,900 1,703.23 2 n/a n/a n/a
2023-04-27 2023-03-31 13F SEALED AIR CORP CALL Call 3,100 -63.10 0 n/a n/a n/a
2023-02-02 2022-12-31 13F SEALED AIR CORP CALL Call 8,400 -54.10 0 -100.00 n/a n/a n/a
2022-11-04 2022-09-30 13F SEALED AIR CORP CALL Call 18,300 103.33 814 56.84 n/a n/a n/a
2022-08-03 2022-06-30 13F SEALED AIR CORP CALL Call 9,000 -36.17 519 -45.02 n/a n/a n/a
2022-05-02 2022-03-31 13F SEALED AIR CORP CALL Call 14,100 53.26 944 52.26 n/a n/a n/a
2022-02-23 2021-12-31 13F/A SEALED AIR CORP CALL Call 9,200 -73.49 620 -69.79 n/a n/a n/a
2022-02-04 2021-12-31 13F SEALED AIR CORP CALL Call 34,700 2,052 n/a n/a n/a
2021-10-28 2021-09-30 13F SEALED AIR CORP CALL Call 34,700 0.87 2,052 0.69 n/a n/a n/a
2021-08-12 2021-06-30 13F SEALED AIR CORP CALL Call 34,400 8,720.51 2,038 14.11 n/a n/a n/a
2021-04-26 2021-03-31 13F SEALED AIR CORP CALL Call 390 30.87 1,786 30.94 n/a n/a n/a
2021-02-02 2020-12-31 13F SEALED AIR CORP CALL Call 298 -39.31 1,364 -28.40 n/a n/a n/a
2020-10-14 2020-09-30 13F SEALED AIR CORP CALL Call 491 107.17 1,905 144.86 n/a n/a n/a
2020-07-13 2020-06-30 13F SEALED AIR CORP CALL Call 237 415.22 778 588.50 n/a n/a n/a
2020-04-29 2020-03-31 13F SEALED AIR CORP CALL Call 46 -69.93 113 -81.44 n/a n/a n/a
2020-02-05 2019-12-31 13F SEALED AIR CORP CALL Call 153 -74.58 609 -75.62 n/a n/a n/a
2019-10-15 2019-09-30 13F SEALED AIR CORP CALL Call 602 35.59 2,498 31.54 n/a n/a n/a
2019-07-26 2019-06-30 13F SEALED AIR CORP CALL Call 444 6.73 1,899 -0.89 n/a n/a n/a
2019-04-18 2019-03-31 13F SEALED AIR CORP CALL Call 416 261.74 1,916 379.00 n/a n/a n/a
2019-01-16 2018-12-31 13F SEALED AIR CORP CALL Call 115 -19.58 400 -30.31 n/a n/a n/a
2018-10-23 2018-09-30 13F SEALED AIR CORP CALL Call 143 -49.65 574 -52.37 n/a n/a n/a
2018-07-30 2018-06-30 13F SEALED AIR CORP CALL Call 284 -4.05 1,205 5,139.13 n/a n/a n/a
2018-04-26 2018-03-31 13F SEALED AIR CORP CALL Call 296 -51.71 23 -83.92 n/a n/a n/a
2018-01-10 2017-12-31 13F SEALED AIR CORP CALL Call 613 41.24 143 1,200.00 n/a n/a n/a
2017-10-25 2017-09-30 13F SEALED AIR CORP CALL Call 434 -67.34 11 -87.36 n/a n/a n/a
2017-07-12 2017-06-30 13F SEALED AIR CORP CALL Call 1,329 197.98 87 314.29 n/a n/a n/a
2017-04-21 2017-03-31 13F SEALED AIR CORP CALL Call 446 374.47 21 -27.59 n/a n/a n/a
2017-01-11 2016-12-31 13F SEALED AIR CORP CALL Call 94 370.00 29 1,350.00 n/a n/a n/a
2016-10-07 2016-09-30 13F SEALED AIR CORP CALL Call 20 -28.57 2 -50.00 n/a n/a n/a
2016-07-18 2016-06-30 13F SEALED AIR CORP CALL Call 28 -77.78 4 -88.57 n/a n/a n/a
2016-04-14 2016-03-31 13F SEALED AIR CORP CALL Call 126 137.74 35 3,400.00 n/a n/a n/a
2016-01-20 2015-12-31 13F SEALED AIR CORP CALL Call 53 -24.29 1 -87.50 n/a n/a n/a
2015-10-08 2015-09-30 13F SEALED AIR CORP CALL Call 70 438.46 8 700.00 n/a n/a n/a
2015-07-08 2015-06-30 13F SEALED AIR CORP CALL Call 13 -27.78 1 -75.00 n/a n/a n/a
2015-04-21 2015-03-31 13F SEALED AIR CORP CALL Call 18 -95.41 4 -98.21 n/a n/a n/a
2015-03-04 2014-12-31 13F SEALED AIR CALL Call 392 223 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
(%)
2026-05-14 2026-03-31 13F SEALED AIR CORP PUT Put 1,300 -35.00 55 -34.15 n/a n/a n/a
2026-02-11 2025-12-31 13F SEALED AIR CORP PUT Put 2,000 42.86 83 n/a n/a n/a
2025-11-12 2025-09-30 13F SEALED AIR CORP PUT Put 1,400 -12.50 0 n/a n/a n/a
2025-08-05 2025-06-30 13F SEALED AIR CORP PUT Put 1,600 -77.78 0 n/a n/a n/a
2025-05-12 2025-03-31 13F SEALED AIR CORP PUT Put 7,200 71.43 0 n/a n/a n/a
2025-02-11 2024-12-31 13F SEALED AIR CORP PUT Put 4,200 -62.16 0 n/a n/a n/a
2024-11-08 2024-09-30 13F SEALED AIR CORP PUT Put 11,100 -94.00 0 -100.00 n/a n/a n/a
2024-07-25 2024-06-30 13F SEALED AIR CORP PUT Put 185,000 -31.07 6 -33.33 n/a n/a n/a
2024-04-25 2024-03-31 13F SEALED AIR CORP PUT Put 268,400 47.88 10 50.00 n/a n/a n/a
2024-02-02 2023-12-31 13F SEALED AIR CORP PUT Put 181,500 115.56 7 200.00 n/a n/a n/a
2023-11-01 2023-09-30 13F SEALED AIR CORP PUT Put 84,200 117.01 3 100.00 n/a n/a n/a
2023-08-04 2023-06-30 13F SEALED AIR CORP PUT Put 38,800 2 n/a n/a n/a
2023-04-27 2023-03-31 13F SEALED AIR CORP PUT Put 0 -100.00 0 n/a n/a n/a
2023-02-02 2022-12-31 13F SEALED AIR CORP PUT Put 900 -87.84 0 -100.00 n/a n/a n/a
2022-11-04 2022-09-30 13F SEALED AIR CORP PUT Put 7,400 393.33 329 282.56 n/a n/a n/a
2022-08-03 2022-06-30 13F SEALED AIR CORP PUT Put 1,500 400.00 86 330.00 n/a n/a n/a
2022-05-02 2022-03-31 13F SEALED AIR CORP PUT Put 300 -89.66 20 -88.30 n/a n/a n/a
2022-02-04 2021-12-31 13F SEALED AIR CORP PUT Put 2,900 0.00 171 0.00 n/a n/a n/a
2021-10-28 2021-09-30 13F SEALED AIR CORP PUT Put 2,900 0.00 171 0.00 n/a n/a n/a
2021-08-12 2021-06-30 13F SEALED AIR CORP PUT Put 2,900 28,900.00 171 280.00 n/a n/a n/a
2021-04-26 2021-03-31 13F SEALED AIR CORP PUT Put 10 -33.33 45 -33.82 n/a n/a n/a
2021-02-02 2020-12-31 13F SEALED AIR CORP PUT Put 15 -25.00 68 -11.69 n/a n/a n/a
2020-10-14 2020-09-30 13F SEALED AIR CORP PUT Put 20 -51.22 77 -42.54 n/a n/a n/a
2020-07-13 2020-06-30 13F SEALED AIR CORP PUT Put 41 -39.71 134 -20.24 n/a n/a n/a
2020-04-29 2020-03-31 13F SEALED AIR CORP PUT Put 68 -50.72 168 -69.40 n/a n/a n/a
2020-02-05 2019-12-31 13F SEALED AIR CORP PUT Put 138 133.90 549 125.00 n/a n/a n/a
2019-10-15 2019-09-30 13F SEALED AIR CORP PUT Put 59 37.21 244 33.33 n/a n/a n/a
2019-07-26 2019-06-30 13F SEALED AIR CORP PUT Put 43 -90.21 183 -90.95 n/a n/a n/a
2019-04-18 2019-03-31 13F SEALED AIR CORP PUT Put 439 6.55 2,022 40.91 n/a n/a n/a
2019-01-16 2018-12-31 13F SEALED AIR CORP PUT Put 412 415.00 1,435 347.04 n/a n/a n/a
2018-10-23 2018-09-30 13F SEALED AIR CORP PUT Put 80 -45.58 321 -48.56 n/a n/a n/a
2018-07-30 2018-06-30 13F SEALED AIR CORP PUT Put 147 75.00 624 7,700.00 n/a n/a n/a
2018-04-26 2018-03-31 13F SEALED AIR CORP PUT Put 84 -8.70 8 700.00 n/a n/a n/a
2018-01-10 2017-12-31 13F SEALED AIR CORP PUT Put 92 -27.56 1 -96.43 n/a n/a n/a
2017-10-25 2017-09-30 13F SEALED AIR CORP PUT Put 127 3.25 28 27.27 n/a n/a n/a
2017-07-12 2017-06-30 13F SEALED AIR CORP PUT Put 123 92.19 22 4.76 n/a n/a n/a
2017-04-21 2017-03-31 13F SEALED AIR CORP PUT Put 64 156.00 21 133.33 n/a n/a n/a
2017-01-11 2016-12-31 13F SEALED AIR CORP PUT Put 25 47.06 9 -10.00 n/a n/a n/a
2016-10-07 2016-09-30 13F SEALED AIR CORP PUT Put 17 -41.38 10 -41.18 n/a n/a n/a
2016-07-18 2016-06-30 13F SEALED AIR CORP PUT Put 29 45.00 17 54.55 n/a n/a n/a
2016-04-14 2016-03-31 13F SEALED AIR CORP PUT Put 20 -23.08 11 0.00 n/a n/a n/a
2016-01-20 2015-12-31 13F SEALED AIR CORP PUT Put 26 -50.00 11 -56.00 n/a n/a n/a
2015-10-08 2015-09-30 13F SEALED AIR CORP PUT Put 52 271.43 25 127.27 n/a n/a n/a
2015-07-08 2015-06-30 13F SEALED AIR CORP PUT Put 14 -26.32 0 -100.00 n/a n/a n/a
2015-04-21 2015-03-31 13F SEALED AIR CORP PUT Put 19 -69.35 1 -75.00 n/a n/a n/a
2015-03-04 2014-12-31 13F SEALED AIR PUT Put 62 4 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.