Aclaris Therapeutics, Inc.
US ˙ NasdaqGS ˙ US00461U1051

SecurityACRS / Aclaris Therapeutics, Inc.
InstitutionState Street Corp
Latest Disclosed Ownership2,008,746 shares
Latest Disclosed Value $ 7,532,798
State Street Corp reports 33.35% increase in ownership of ACRS / Aclaris Therapeutics, Inc.

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 2,008,746 shares of Aclaris Therapeutics, Inc. (US:ACRS) valued at $7,532,798 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,506,403 shares of Aclaris Therapeutics, Inc.. This represents a change in shares of 33.35% during the quarter. The current value of the position is $9,461,194 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)
2026-05-15 2026-03-31 13F ACLARIS THERAPEUTICS COM 00461U105 2,008,746 502,343 33.35 7,533 66.12 0.0003
2026-02-13 2025-12-31 13F ACLARIS THERAPEUTICS COM 00461U105 1,506,403 393,257 35.33 4,534 114.47 0.0002
2025-11-14 2025-09-30 13F ACLARIS THERAPEUTICS COM 00461U105 1,113,146 106,253 10.55 2,115 47.94 0.0001
2025-08-14 2025-06-30 13F ACLARIS THERAPEUTICS COM 00461U105 1,006,893 599,368 147.08 1,430 129.37 0.0001
2025-05-15 2025-03-31 13F ACLARIS THERAPEUTICS COM 00461U105 407,525 88,250 27.64 624 -21.24 0.0000
2025-02-14 2024-12-31 13F ACLARIS THERAPEUTICS COM 00461U105 319,275 130,554 69.18 792 264.52 0.0000
2024-11-14 2024-09-30 13F ACLARIS THERAPEUTICS COM 00461U105 188,721 -7,900 -4.02 217 0.46 0.0000
2024-08-14 2024-06-30 13F ACLARIS THERAPEUTICS COM 00461U105 196,621 -1,141,818 -85.31 216 -86.98 0.0000
2024-05-15 2024-03-31 13F ACLARIS THERAPEUTICS COM 00461U105 1,338,439 -50,000 -3.60 1,660 13.86 0.0001
2024-02-14 2023-12-31 13F ACLARIS THERAPEUTICS COM 00461U105 1,388,439 -174,069 -11.14 1,458 -86.39 0.0001
2023-11-14 2023-09-30 13F ACLARIS THERAPEUTICS COM 00461U105 1,562,508 110,524 7.61 10,703 -28.92 0.0006
2023-08-14 2023-06-30 13F ACLARIS THERAPEUTICS COM 00461U105 1,451,984 28,630 2.01 15,057 30.77 0.0008
2023-05-15 2023-03-31 13F ACLARIS THERAPEUTICS COM 00461U105 1,423,354 120,024 9.21 11,515 -43.91 0.0006
2023-05-15 2022-12-31 13F/A-99 ACLARIS THERAPEUTICS COM 00461U105 1,303,330 303 0.02 20,527 0.08 0.0012
2023-05-15 2022-12-31 13F ACLARIS THERAPEUTICS COM 00461U105 1,303,330 303 20,527 0.0012
2022-11-15 2022-09-30 13F ACLARIS THERAPEUTICS COM 00461U105 1,303,027 72,786 5.92 20,510 19.42 0.0013
2022-08-15 2022-06-30 13F ACLARIS THERAPEUTICS COM 00461U105 1,230,241 146,851 13.55 17,174 -8.05 0.0010
2022-05-16 2022-03-31 13F ACLARIS THERAPEUTICS COM 00461U105 1,083,390 36,000 3.44 18,678 22.65 0.0009
2022-02-14 2021-12-31 13F ACLARIS THERAPEUTICS COM 00461U105 1,047,390 -10,774 -1.02 15,229 -20.05 0.0007
2021-11-15 2021-09-30 13F ACLARIS THERAPEUTICS COM 00461U105 1,058,164 -12,050 -1.13 19,047 1.35 0.0010
2021-08-16 2021-06-30 13F ACLARIS THERAPEUTICS COM 00461U105 1,070,214 877,272 454.68 18,793 286.53 0.0010
2021-07-09 2021-03-31 13F/A-1 ACLARIS THERAPEUTICS COM 00461U105 192,942 114,902 147.23 4,862 862.77 0.0003
2021-05-17 2021-03-31 13F ACLARIS THERAPEUTICS COM 00461U105 192,942 114,902 4,862 0.0003
2021-02-16 2020-12-31 13F ACLARIS THERAPEUTICS COM 00461U105 78,040 0 0.00 505 151.24 0.0000
2020-11-10 2020-09-30 13F ACLARIS THERAPEUTICS COM 00461U105 78,040 0 0.00 201 59.52 0.0000
2020-08-14 2020-06-30 13F ACLARIS THERAPEUTICS COM 00461U105 78,040 -589,148 -88.30 126 -81.84 0.0000
2020-06-19 2020-03-31 13F/A-1 ACLARIS THERAPEUTICS COM 00461U105 667,188 -70,210 -9.52 694 -50.22 0.0001
2020-05-11 2020-03-31 13F ACLARIS THERAPEUTICS COM 00461U105 667,188 -70,210 694 60.9472
2020-02-06 2019-12-31 13F ACLARIS THERAPEUTICS COM 00461U105 737,398 -5,932 -0.80 1,394 73.60 0.0001
2019-11-14 2019-09-30 13F ACLARIS THERAPEUTICS COM 00461U105 743,330 136,751 22.54 803 -39.53 0.0001
2019-08-14 2019-06-30 13F ACLARIS THERAPEUTICS COM 00461U105 606,579 -48,763 -7.44 1,328 -66.17 0.0001
2019-05-15 2019-03-31 13F ACLARIS THERAPEUTICS COM 00461U105 655,342 -79,341 -10.80 3,925 -27.70 0.0003
2019-02-12 2018-12-31 13F ACLARIS THERAPEUTICS COM 00461U105 734,683 126,584 20.82 5,429 -38.53 0.0005
2018-11-09 2018-09-30 13F ACLARIS THERAPEUTICS Common equity shares 00461U105 608,099 51,454 9.24 8,832 -20.58 0.0007
2018-08-14 2018-06-30 13F ACLARIS THERAPEUTICS Common equity shares 00461U105 556,645 -6,517 -1.16 11,120 12.70 0.0009
2018-05-15 2018-03-31 13F ACLARIS THERAPEUTICS Common equity shares 00461U105 563,162 73,738 15.07 9,867 -18.25 0.0008
2018-02-14 2017-12-31 13F ACLARIS THERAPEUTICS Common equity shares 00461U105 489,424 -12,817 -2.55 12,070 -6.88 0.0010
2017-11-14 2017-09-30 13F ACLARIS THERAPEUTICS Common equity shares 00461U105 502,241 171,486 51.85 12,962 44.49 0.0011
2017-08-14 2017-06-30 13F ACLARIS THERAPEUTICS Common equity shares 00461U105 330,755 132,866 67.14 8,971 52.00 0.0008
2017-05-15 2017-03-31 13F ACLARIS THERAPEUTICS Common equity shares 00461U105 197,889 27,259 15.98 5,902 27.45 0.0005
2017-02-09 2016-12-31 13F ACLARIS THERAPEUTICS Common equity shares 00461U105 170,630 38,570 29.21 4,631 36.89 0.0004
2017-01-13 2016-09-30 13F/A-1 ACLARIS THERAPEUTICS Common equity shares 00461U105 132,060 12,050 10.04 3,383 52.59 0.0003
2016-11-14 2016-09-30 13F ACLARIS THERAPEUTICS Common equity shares 00461U105 132,060 3,383
2016-08-12 2016-06-30 13F ACLARIS THERAPEUTICS Common equity shares 00461U105 120,010 47,179 64.78 2,217 60.77 0.0002
2016-05-20 2016-03-31 13F/A-1 ACLARIS THERAPEUTICS Common equity shares 00461U105 72,831 28,178 63.10 1,379 14.73 0.0001
2016-05-12 2016-03-31 13F ACLARIS THERAPEUTICS Common equity shares 00461U105 72,831 1,379
2016-02-16 2015-12-31 13F ACLARIS THERAPEUTICS Common equity shares 00461U105 44,653 44,653 1,202 0.0001
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.