Donaldson Company, Inc.
US ˙ NYSE ˙ US2576511099

SecurityDCI / Donaldson Company, Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership180,409 shares
Latest Disclosed Value $ 15,995,099
Sei Investments Co ownership in DCI / Donaldson Company, Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 180,409 shares of Donaldson Company, Inc. (US:DCI) valued at $15,995,062 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 157,785 shares of Donaldson Company, Inc.. This represents a change in shares of 14.34% during the quarter. The current value of the position is $15,163,376 USD.

Sei Investments Co has a history of taking positions in derivatives of the underlying security (DCI) 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.

DCI / Donaldson Company, 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 DONALDSON COM 257651109 180,409 22,624 14.34 15,995 23.86 0.0158
2025-11-13 2025-09-30 13F DONALDSON COM 257651109 157,785 -3,895 -2.41 12,915 15.18 0.0139
2025-08-14 2025-06-30 13F DONALDSON COM 257651109 161,680 3,824 2.42 11,212 5.92 0.0130
2025-05-14 2025-03-31 13F/A-1 DONALDSON COM 257651109 157,856 21,891 16.10 10,586 15.59 0.0136
2025-05-13 2025-03-31 13F DONALDSON COM 257651109 133,022 -2,943 8,955 0.0097
2025-02-11 2024-12-31 13F DONALDSON COM 257651109 135,965 -13,437 -8.99 9,157 -16.83 0.0118
2024-11-12 2024-09-30 13F DONALDSON COM 257651109 149,402 -23,790 -13.74 11,011 -11.16 0.0143
2024-08-13 2024-06-30 13F DONALDSON COM 257651109 173,192 14,665 9.25 12,393 4.68 0.0176
2024-05-07 2024-03-31 13F DONALDSON COM 257651109 158,527 6,236 4.09 11,839 18.97 0.0173
2024-02-14 2023-12-31 13F DONALDSON COM 257651109 152,291 -5,178 -3.29 9,952 5.95 0.0160
2023-11-14 2023-09-30 13F DONALDSON COM 257651109 157,469 -17,016 -9.75 9,392 -13.90 0.0169
2023-08-11 2023-06-30 13F DONALDSON COM 257651109 174,485 -10,956 -5.91 10,908 -9.97 0.0190
2023-05-12 2023-03-31 13F DONALDSON COM 257651109 185,441 133,040 253.89 12,117 292.74 0.0225
2023-02-10 2022-12-31 13F DONALDSON COM 257651109 52,401 -176,100 -77.07 3,085 -72.45 0.0069
2022-11-14 2022-09-30 13F DONALDSON COM 257651109 228,501 32,725 16.72 11,199 18.80 0.0250
2022-08-15 2022-06-30 13F DONALDSON COM 257651109 195,776 -145,609 -42.65 9,427 -46.88 0.0204
2022-05-13 2022-03-31 13F DONALDSON COM 257651109 341,385 5,899 1.76 17,748 -10.87 0.0357
2022-02-14 2021-12-31 13F DONALDSON COM 257651109 335,486 -7,361 -2.15 19,912 0.92 0.0374
2021-11-12 2021-09-30 13F DONALDSON COM 257651109 342,847 309,826 938.27 19,731 822.87 0.0414
2021-08-06 2021-06-30 13F DONALDSON COM 257651109 33,021 -6,867 -17.22 2,138 -7.96 0.0047
2021-05-12 2021-03-31 13F DONALDSON COM 257651109 39,888 6,092 18.03 2,323 21.94 0.0059
2021-02-08 2020-12-31 13F DONALDSON COM 257651109 33,796 -1,601 -4.52 1,905 12.19 0.0049
2020-12-04 2020-09-30 13F/A-1 DONALDSON COM 257651109 35,397 3,100 9.60 1,698 10.33 0.0049
2020-11-06 2020-09-30 13F DONALDSON COM 257651109 35,891 3,594 1,721 4,143.7854
2020-08-17 2020-06-30 13F/A-1 DONALDSON COM 257651109 32,297 -13,711 -29.80 1,539 -14.83 0.0048
2020-08-11 2020-06-30 13F DONALDSON COM 257651109 29,031 -16,977 1,658 4,497.4133
2020-05-14 2020-03-31 13F DONALDSON COM 257651109 46,008 15,872 52.67 1,807 4.75 0.0066
2020-02-06 2019-12-31 13F DONALDSON COM 257651109 30,136 -5,716 -15.94 1,725 -7.36 0.0051
2019-11-12 2019-09-30 13F DONALDSON COM 257651109 35,852 4,984 16.15 1,862 18.83 0.0048
2019-08-14 2019-06-30 13F DONALDSON COM 257651109 30,868 1,649 5.64 1,567 7.04 0.0051
2019-05-15 2019-03-31 13F DONALDSON COM 257651109 29,219 2,328 8.66 1,464 -4.19 0.0049
2019-02-13 2018-12-31 13F DONALDSON COM 257651109 26,891 1,477 5.81 1,528 3.52 0.0054
2018-11-08 2018-09-30 13F DONALDSON COM 257651109 25,414 3,230 14.56 1,476 47.45 0.0053
2018-08-03 2018-06-30 13F DONALDSON COM 257651109 22,184 -20,874 -48.48 1,001 -48.40 0.0034
2018-05-11 2018-03-31 13F DONALDSON COM 257651109 43,058 171 0.40 1,940 -7.58 0.0074
2018-02-08 2017-12-31 13F DONALDSON COM 257651109 42,887 21,045 96.35 2,099 109.27 0.0073
2017-11-06 2017-09-30 13F DONALDSON COM 257651109 21,842 18,890 639.91 1,003 648.51 0.0036
2017-07-31 2017-06-30 13F DONALDSON COM 257651109 2,952 -46,392 -94.02 134 -94.03 0.0005
2017-05-05 2017-03-31 13F DONALDSON COM 257651109 49,344 1,969 4.16 2,246 12.69 0.0098
2017-02-02 2016-12-31 13F DONALDSON COM 257651109 47,375 -14,695 -23.67 1,993 -13.98 0.0097
2016-11-04 2016-09-30 13F DONALDSON COM 257651109 62,070 2,118 3.53 2,317 12.48 0.0118
2016-08-11 2016-06-30 13F DONALDSON COM 257651109 59,952 5,269 9.64 2,060 18.05 0.0124
2016-05-10 2016-03-31 13F/A-1 DONALDSON COM 257651109 54,683 24,759 82.74 1,745 103.62 0.0109
2016-02-03 2015-12-31 13F DONALDSON COM 257651109 29,924 2,781 10.25 857 12.47 0.0052
2015-11-02 2015-09-30 13F/A-1 DONALDSON COM 257651109 27,143 13,583 100.17 762 56.79 0.0070
2015-10-30 2015-09-30 13F DONALDSON COM 257651109 27,143 763
2015-08-07 2015-06-30 13F/A-1 DONALDSON COM 257651109 13,560 7,165 112.04 486 101.66 0.0044
2015-08-04 2015-06-30 13F DONALDSON COM 257651109 13,560 7,165 486 0.0044
2015-05-14 2015-03-31 13F/A-1 DONALDSON COM 257651109 6,395 6,373 28,968.18 241 24,000.00 0.0021
2015-05-01 2015-03-31 13F DOMINOS PIZZA PUT 257651109 6,395 6,395 241 0.0021
2015-02-10 2014-12-31 13F DONALDSON COM 257651109 22 22 1 0.0000
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 DOMINOS PIZZA PUT 6,395 241 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.