BlackLine, Inc.
US ˙ NasdaqGS ˙ US09239B1098

SecurityBL / BlackLine, Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership215,377 shares
Latest Disclosed Value $ 11,908,349
Sei Investments Co reports 26.03% increase in ownership of BL / BlackLine, Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 215,377 shares of BlackLine, Inc. (US:BL) valued at $11,908,194 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 170,900 shares of BlackLine, Inc.. This represents a change in shares of 26.03% during the quarter. The current value of the position is $6,205,011 USD.

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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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 BLACKLINE COM 09239B109 215,377 44,477 26.03 11,908 31.23 0.0118
2025-11-13 2025-09-30 13F BLACKLINE COM 09239B109 170,900 1,696 1.00 9,075 -5.28 0.0098
2025-08-14 2025-06-30 13F BLACKLINE COM 09239B109 169,204 9,824 6.16 9,581 24.16 0.0111
2025-05-14 2025-03-31 13F/A-1 BLACKLINE COM 09239B109 159,380 11,999 8.14 7,717 -13.83 0.0099
2025-05-13 2025-03-31 13F BLACKLINE COM 09239B109 147,454 73 8,840 0.0096
2025-02-11 2024-12-31 13F BLACKLINE COM 09239B109 147,381 8,558 6.16 8,955 16.97 0.0115
2024-11-12 2024-09-30 13F BLACKLINE COM 09239B109 138,823 -46,621 -25.14 7,656 -14.79 0.0099
2024-08-13 2024-06-30 13F BLACKLINE COM 09239B109 185,444 13,692 7.97 8,985 -19.00 0.0127
2024-05-07 2024-03-31 13F BLACKLINE COM 09239B109 171,752 -9,027 -4.99 11,092 -1.74 0.0163
2024-02-14 2023-12-31 13F BLACKLINE COM 09239B109 180,779 -22,628 -11.12 11,288 0.04 0.0181
2023-11-14 2023-09-30 13F BLACKLINE COM 09239B109 203,407 -15,328 -7.01 11,283 -4.16 0.0203
2023-08-11 2023-06-30 13F BLACKLINE COM 09239B109 218,735 59,137 37.05 11,772 9.85 0.0205
2023-05-12 2023-03-31 13F BLACKLINE COM 09239B109 159,598 3,554 2.28 10,717 2.09 0.0199
2023-02-10 2022-12-31 13F BLACKLINE COM 09239B109 156,044 35,495 29.44 10,497 45.35 0.0233
2022-11-14 2022-09-30 13F BLACKLINE COM 09239B109 120,549 7,855 6.97 7,222 -4.09 0.0161
2022-08-15 2022-06-30 13F BLACKLINE COM 09239B109 112,694 13,304 13.39 7,530 3.41 0.0163
2022-05-13 2022-03-31 13F BLACKLINE COM 09239B109 99,390 -19,097 -16.12 7,282 -40.60 0.0146
2022-02-14 2021-12-31 13F BLACKLINE COM 09239B109 118,487 10,991 10.22 12,260 -3.38 0.0230
2021-11-12 2021-09-30 13F BLACKLINE COM 09239B109 107,496 -2,059 -1.88 12,689 4.14 0.0266
2021-08-06 2021-06-30 13F BLACKLINE COM 09239B109 109,555 -3,113 -2.76 12,184 -3.21 0.0270
2021-05-12 2021-03-31 13F BLACKLINE COM 09239B109 112,668 6,546 6.17 12,588 -11.07 0.0317
2021-02-08 2020-12-31 13F BLACKLINE COM 09239B109 106,122 10,344 10.80 14,155 64.92 0.0366
2020-12-04 2020-09-30 13F/A-1 BLACKLINE COM 09239B109 95,778 -15,194 -13.69 8,583 -6.51 0.0249
2020-11-06 2020-09-30 13F BLACKLINE COM 09239B109 95,778 -15,194 8,583 20,665.9557
2020-08-17 2020-06-30 13F/A-1 BLACKLINE COM 09239B109 110,972 14,142 14.60 9,181 79.81 0.0285
2020-08-11 2020-06-30 13F BLACKLINE COM 09239B109 54,305 -42,525 3,196 8,669.3201
2020-05-14 2020-03-31 13F BLACKLINE COM 09239B109 96,830 51,358 112.94 5,106 115.99 0.0188
2020-02-06 2019-12-31 13F BLACKLINE COM 09239B109 45,472 7,820 20.77 2,364 28.97 0.0071
2019-11-12 2019-09-30 13F BLACKLINE COM 09239B109 37,652 -2,010 -5.07 1,833 -14.35 0.0047
2019-08-14 2019-06-30 13F BLACKLINE COM 09239B109 39,662 38,199 2,611.00 2,140 4,015.38 0.0070
2019-05-15 2019-03-31 13F BLACKLINE COM 09239B109 1,463 -385 -20.83 52 -1.89 0.0002
2019-02-13 2018-12-31 13F BLACKLINE COM 09239B109 1,848 891 93.10 53 1.92 0.0002
2018-11-08 2018-09-30 13F BLACKLINE COM 09239B109 957 957 52 0.0002
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.