BlackLine, Inc.
US ˙ NasdaqGS ˙ US09239B1098

SecurityBL / BlackLine, Inc.
InstitutionNorthern Trust Corp
Latest Disclosed Ownership591,514 shares
Latest Disclosed Value $ 21,886,018
Northern Trust Corp reports 7.20% decrease in ownership of BL / BlackLine, Inc.

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 591,514 shares of BlackLine, Inc. (US:BL) valued at $21,886,018 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 637,392 shares of BlackLine, Inc.. This represents a change in shares of -7.20% during the quarter. The current value of the position is $17,041,518 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)
2026-05-14 2026-03-31 13F BLACKLINE COM 09239B109 591,514 -45,878 -7.20 21,886 -37.90 0.0006
2026-02-17 2025-12-31 13F BLACKLINE COM 09239B109 637,392 -62,102 -8.88 35,241 -5.12 0.0009
2025-11-14 2025-09-30 13F BLACKLINE COM 09239B109 699,494 -19,483 -2.71 37,143 -8.76 0.0048
2025-08-13 2025-06-30 13F BLACKLINE COM 09239B109 718,977 -51,788 -6.72 40,708 9.08 0.0056
2025-05-13 2025-03-31 13F BLACKLINE COM 09239B109 770,765 25,368 3.40 37,320 -17.60 0.0055
2025-02-14 2024-12-31 13F BLACKLINE COM 09239B109 745,397 96,523 14.88 45,290 26.59 0.0064
2024-11-13 2024-09-30 13F BLACKLINE COM 09239B109 648,874 -9,902 -1.50 35,779 12.10 0.0059
2024-08-14 2024-06-30 13F BLACKLINE COM 09239B109 658,776 -175,801 -21.06 31,918 -40.78 0.0054
2024-05-14 2024-03-31 13F BLACKLINE COM 09239B109 834,577 24,399 3.01 53,897 6.54 0.0093
2024-02-13 2023-12-31 13F BLACKLINE COM 09239B109 810,178 22,889 2.91 50,588 15.84 0.0092
2023-11-13 2023-09-30 13F BLACKLINE COM 09239B109 787,289 112,684 16.70 43,671 20.28 0.0085
2023-08-11 2023-06-30 13F BLACKLINE COM 09239B109 674,605 27,618 4.27 36,307 -16.43 0.0070
2023-05-15 2023-03-31 13F BLACKLINE COM 09239B109 646,987 2,949 0.46 43,445 0.28 0.0086
2023-02-13 2022-12-31 13F BLACKLINE COM 09239B109 644,038 -4,550 -0.70 43,324 11.51 0.0091
2022-11-14 2022-09-30 13F BLACKLINE COM 09239B109 648,588 -6,581 -1.00 38,851 -10.96 0.0089
2022-08-12 2022-06-30 13F BLACKLINE COM 09239B109 655,169 -24,876 -3.66 43,635 -12.37 0.0093
2022-05-13 2022-03-31 13F BLACKLINE COM 09239B109 680,045 -26,028 -3.69 49,793 -31.89 0.0088
2022-02-08 2021-12-31 13F BLACKLINE COM 09239B109 706,073 -14,998 -2.08 73,108 -14.12 0.0120
2021-11-15 2021-09-30 13F BLACKLINE COM 09239B109 721,071 -13,417 -1.83 85,130 4.16 0.0151
2021-08-13 2021-06-30 13F BLACKLINE COM 09239B109 734,488 -5,330 -0.72 81,727 1.91 0.0144
2021-05-12 2021-03-31 13F BLACKLINE COM 09239B109 739,818 -20,561 -2.70 80,196 -20.93 0.0149
2021-02-11 2020-12-31 13F BLACKLINE COM 09239B109 760,379 3,878 0.51 101,419 49.57 0.0198
2020-11-16 2020-09-30 13F BLACKLINE COM 09239B109 756,501 -17,106 -2.21 67,806 5.72 0.0149
2020-08-14 2020-06-30 13F BLACKLINE COM 09239B109 773,607 121,706 18.67 64,139 87.01 0.0152
2020-05-14 2020-03-31 13F BLACKLINE COM 09239B109 651,901 7,496 1.16 34,297 3.23 0.0098
2020-02-14 2019-12-31 13F BLACKLINE COM 09239B109 644,405 -11,670 -1.78 33,225 5.92 0.0074
2019-11-13 2019-09-30 13F BLACKLINE COM 09239B109 656,075 58,166 9.73 31,367 -1.96 0.0075
2019-08-13 2019-06-30 13F BLACKLINE COM 09239B109 597,909 -8,420 -1.39 31,995 13.92 0.0076
2019-05-13 2019-03-31 13F BLACKLINE COM 09239B109 606,329 34,559 6.04 28,085 19.95 0.0069
2019-02-12 2018-12-31 13F BLACKLINE COM 09239B109 571,770 4,734 0.83 23,414 -26.88 0.0066
2018-11-14 2018-09-30 13F BLACKLINE COM 09239B109 567,036 59,519 11.73 32,021 45.28 0.0078
2018-09-18 2018-06-30 13F/A-1 BLACKLINE COM 09239B109 507,517 88,471 21.11 22,041 34.14 0.0056
2018-08-14 2018-06-30 13F BLACKLINE COM 09239B109 510,785 91,739 22,183
2018-05-09 2018-03-31 13F BLACKLINE COM 09239B109 419,046 200,490 91.73 16,431 129.23 0.0043
2018-02-14 2017-12-31 13F BLACKLINE COM 09239B109 218,556 21,879 11.12 7,168 6.81 0.0018
2017-11-13 2017-09-30 13F BLACKLINE COM 09239B109 196,677 42,114 27.25 6,711 21.49 0.0017
2017-08-11 2017-06-30 13F BLACKLINE COM 09239B109 154,563 47,658 44.58 5,524 73.60 0.0015
2017-05-12 2017-03-31 13F BLACKLINE COM 09239B109 106,905 -13,211 -11.00 3,182 -4.13 0.0009
2017-02-13 2016-12-31 13F BLACKLINE COM 09239B109 120,116 120,116 3,319 0.0010
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.