MillerKnoll, Inc.
US ˙ NasdaqGS ˙ US6005441000

SecurityMLKN / MillerKnoll, Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership75,959 shares
Latest Disclosed Value $ 1,388,533
Sei Investments Co ownership in MLKN / MillerKnoll, Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 75,959 shares of MillerKnoll, Inc. (US:MLKN) valued at $1,388,531 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 17,885 shares of MillerKnoll, Inc.. This represents a change in shares of 324.71% during the quarter. The current value of the position is $1,119,636 USD.

Sei Investments Co has a history of taking positions in derivatives of the underlying security (MLKN) in the form of stock options.

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.

MLKN / MillerKnoll, 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)
2026-02-13 2025-12-31 13F MILLERKNOLL COM 600544100 75,959 58,074 324.71 1,389 337.85 0.0014
2025-11-13 2025-09-30 13F MILLERKNOLL COM 600544100 17,885 -12,286 -40.72 317 -45.81 0.0003
2025-08-14 2025-06-30 13F MILLERKNOLL COM 600544100 30,171 2,795 10.21 586 11.85 0.0007
2025-05-14 2025-03-31 13F/A-1 MILLERKNOLL COM 600544100 27,376 11,374 71.08 524 44.88 0.0007
2025-05-13 2025-03-31 13F MILLERKNOLL COM 600544100 16,002 0 361 0.0004
2025-02-11 2024-12-31 13F MILLERKNOLL COM 600544100 16,002 1,800 12.67 361 2.85 0.0005
2024-11-12 2024-09-30 13F MILLERKNOLL COM 600544100 14,202 14,202 352 0.0005
2024-08-13 2024-06-30 13F MILLERKNOLL COM 600544100 0 -11,006 -100.00 0 -100.00
2024-05-07 2024-03-31 13F MILLERKNOLL COM 600544100 11,006 -8,300 -42.99 273 -47.18 0.0004
2024-02-14 2023-12-31 13F MILLERKNOLL COM 600544100 19,306 -4,056 -17.36 515 -9.81 0.0008
2023-11-14 2023-09-30 13F MILLERKNOLL COM 600544100 23,362 -10,106 -30.20 571 15.59 0.0010
2023-08-11 2023-06-30 13F MILLERKNOLL COM 600544100 33,468 9,651 40.52 495 1.44 0.0009
2023-05-12 2023-03-31 13F MILLERKNOLL COM 600544100 23,817 -67,217 -73.84 487 -74.53 0.0009
2023-02-10 2022-12-31 13F MILLERKNOLL COM 600544100 91,034 11,151 13.96 1,913 53.45 0.0043
2022-11-14 2022-09-30 13F MILLERKNOLL COM 600544100 79,883 7,403 10.21 1,246 -34.56 0.0028
2022-08-15 2022-06-30 13F MILLERKNOLL COM 600544100 72,480 -43,570 -37.54 1,904 -52.53 0.0041
2022-05-13 2022-03-31 13F MILLERKNOLL COM 600544100 116,050 4,298 3.85 4,011 -8.45 0.0081
2022-02-14 2021-12-31 13F MILLERKNOLL COM 600544100 111,752 101,832 1,026.53 4,381 1,074.53 0.0082
2021-11-12 2021-09-30 13F MILLER HERMAN COM 600544100 9,920 -21,502 -68.43 373 -74.83 0.0008
2021-08-06 2021-06-30 13F MILLER HERMAN COM 600544100 31,422 -16,925 -35.01 1,482 -24.19 0.0033
2021-05-12 2021-03-31 13F MILLER HERMAN COM 600544100 48,347 1,040 2.20 1,955 23.19 0.0049
2021-02-08 2020-12-31 13F MILLER HERMAN COM 600544100 47,307 -10,073 -17.55 1,587 -8.37 0.0041
2020-12-04 2020-09-30 13F/A-1 MILLER HERMAN COM 600544100 57,380 5,709 11.05 1,732 41.97 0.0050
2020-11-06 2020-09-30 13F MILLER HERMAN COM 600544100 57,380 5,709 1,732 4,170.2709
2020-08-17 2020-06-30 13F/A-1 MILLER HERMAN COM 600544100 51,671 -7,278 -12.35 1,220 -6.73 0.0038
2020-08-11 2020-06-30 13F MILLER HERMAN COM 600544100 50,671 -8,278 1,524 4,133.9311
2020-05-14 2020-03-31 13F MILLER HERMAN COM 600544100 58,949 -3,541 -5.67 1,308 -49.83 0.0048
2020-02-06 2019-12-31 13F MILLER HERMAN COM 600544100 62,490 -7,668 -10.93 2,607 -19.44 0.0078
2019-11-12 2019-09-30 13F MILLER HERMAN COM 600544100 70,158 7,288 11.59 3,236 15.16 0.0083
2019-08-14 2019-06-30 13F MILLER HERMAN COM 600544100 62,870 -1,746 -2.70 2,810 23.63 0.0092
2019-05-15 2019-03-31 13F MILLER HERMAN COM 600544100 64,616 43,382 204.30 2,273 254.05 0.0076
2019-02-13 2018-12-31 13F MILLER HERMAN COM 600544100 21,234 12,433 141.27 642 89.94 0.0023
2018-11-08 2018-09-30 13F MILLER HERMAN COM 600544100 8,801 -57 -0.64 338 12.29 0.0012
2018-08-03 2018-06-30 13F MILLER HERMAN COM 600544100 8,858 -68 -0.76 301 5.61 0.0010
2018-05-11 2018-03-31 13F MILLER HERMAN COM 600544100 8,926 8,893 26,948.48 285 28,400.00 0.0011
2018-02-08 2017-12-31 13F MILLER HERMAN COM 600544100 33 -4,400 -99.26 1 -99.37 0.0000
2017-11-06 2017-09-30 13F MILLER HERMAN COM 600544100 4,433 7 0.16 159 17.78 0.0006
2017-07-31 2017-06-30 13F MILLER HERMAN COM 600544100 4,426 26 0.59 135 -2.88 0.0005
2017-05-05 2017-03-31 13F MILLER HERMAN COM 600544100 4,400 0 0.00 139 -7.33 0.0006
2017-02-02 2016-12-31 13F MILLER HERMAN COM 600544100 4,400 0 0.00 150 19.05 0.0007
2016-11-04 2016-09-30 13F MILLER HERMAN COM 600544100 4,400 0 0.00 126 -4.55 0.0006
2016-08-11 2016-06-30 13F MILLER HERMAN COM 600544100 4,400 0 0.00 132 -2.94 0.0008
2016-05-10 2016-03-31 13F/A-1 MILLER HERMAN COM 600544100 4,400 -157,000 -97.27 136 -97.06 0.0008
2016-02-03 2015-12-31 13F MILLER HERMAN COM 600544100 161,400 -20,900 -11.46 4,632 -11.91 0.0282
2015-11-02 2015-09-30 13F/A-1 MILLER HERMAN COM 600544100 182,300 11,200 6.55 5,258 6.22 0.0483
2015-10-30 2015-09-30 13F MILLER HERMAN COM 600544100 182,300 5,258
2015-08-07 2015-06-30 13F/A-1 MILLER HERMAN COM 600544100 171,100 27,661 19.28 4,950 24.31 0.0448
2015-08-04 2015-06-30 13F MILLER HERMAN COM 600544100 171,100 27,661 4,950 0.0448
2015-05-14 2015-03-31 13F/A-1 MILLER HERMAN COM 600544100 143,439 65,569 84.20 3,982 73.73 0.0346
2015-05-01 2015-03-31 13F MILLENNIAL MEDIA PUT 600544100 143,439 143,439 3,982 0.0346
2015-02-10 2014-12-31 13F MILLER HERMAN COM 600544100 77,870 77,870 2,292 0.0203
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
(%)
2015-05-01 2015-03-31 13F MILLENNIAL MEDIA PUT 143,439 3,982 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.