401k Record

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Acelyrin 401(k)

Administrative expenses excluding investment management, per participant · Acelyrin, Inc. 401(k) Profit Sharing Plan · plan year 2024

$150.93

Higher than 61% of the 24,371 plans $10 to 50M that report it.

Source

= $18,112 / 120
derived, admin_expenses (2i(12)) minus invst_mgmt_fees (2i(5)), floored at 0; filing 20251125152226NAL0005260320001, received 2025-11-25
participants_with_balance: Form 5500, line 6g(2); PARTCP_ACCOUNT_BAL_CNT pos 78; filing 20251125152226NAL0005260320001, received 2025-11-25

10th: $15.36median $118.8890th: $340.63

Percentiles compare this plan with the Schedule H plans $10 to 50M in assets of the same plan year, excluding final filings; shown only where at least 50 comparable plans report the figure. Plan year 2024-01-01 to 2024-12-31, filing received 2025-11-25.

Cost and contributions

Recordkeeping fees per participant

not reported

Not reported on this filing.

Administrative expenses per participant

$150.93

10th: $26.86median $197.2590th: $456.10

Higher than 39% of the 25,098 plans $10 to 50M that report it.

Source

= $18,112 / 120
Schedule H, line 2i(12) total administrative expenses; TOT_ADMIN_EXPENSES_AMT pos 109; filing 20251125152226NAL0005260320001, received 2025-11-25
participants_with_balance: Form 5500, line 6g(2); PARTCP_ACCOUNT_BAL_CNT pos 78; filing 20251125152226NAL0005260320001, received 2025-11-25

Administrative expenses as a share of assets

0.174%

10th: 0.035%median 0.289%90th: 0.599%

Higher than 31% of the 25,132 plans $10 to 50M that report it.

Source

= $18,112 / $10,398,507
Schedule H, line 2i(12) total administrative expenses; TOT_ADMIN_EXPENSES_AMT pos 109; filing 20251125152226NAL0005260320001, received 2025-11-25
assets_eoy: Schedule H, Part I line 1f col (b); TOT_ASSETS_EOY_AMT pos 61; filing 20251125152226NAL0005260320001, received 2025-11-25

Employer contributions per participant

$6,273

10th: $664median $2,07490th: $4,751

Higher than 95% of the 24,050 plans $10 to 50M that report it.

Source

= $752,710 / 120
Schedule H, Part II line 2a(1)(A); EMPLR_CONTRIB_INCOME_AMT pos 68; filing 20251125152226NAL0005260320001, received 2025-11-25
participants_with_balance: Form 5500, line 6g(2); PARTCP_ACCOUNT_BAL_CNT pos 78; filing 20251125152226NAL0005260320001, received 2025-11-25

Employer share of total contributions

11.3%

10th: 13.1%median 27.9%90th: 45.2%

Higher than 7% of the 24,084 plans $10 to 50M that report it.

Source

= $752,710 / $6,643,989
Schedule H, Part II line 2a(1)(A); EMPLR_CONTRIB_INCOME_AMT pos 68; filing 20251125152226NAL0005260320001, received 2025-11-25
total_contrib: Schedule H, line 2a(3); TOT_CONTRIB_AMT pos 72; filing 20251125152226NAL0005260320001, received 2025-11-25

Plan terms, as stated in Acelyrin, Inc.'s SEC filings

Employer match

“Eligible employees may elect to defer up to 100% of their eligible compensation into the plan on a pretax or after tax basis, up to annual limits prescribed by the Code, with an annual Company match of up to 3% of the amount deferred, subject to the limitations of the Code.”

Form 10-K filed 2025-03-19, for the year ended 2024-12-31 · benefits note, 10-K benefits note · source document

Terms quoted from the filing for the year ended 2024-12-31. Figures cover plan year 2024. The plan document governs.

Plan features

2F ERISA 404(c) plan · 2G fully participant-directed · 2J 401(k) feature · 2K 401(m) arrangement · 2T default investment (QDIA) · 3D IRS pre-approved plan · Form 5500, line 8a; TYPE_PENSION_BNFT_CODE pos 81; filing 20251125152226NAL0005260320001, received 2025-11-25

Full record, Acelyrin, Inc. 401(k) Profit Sharing Plan

FieldValueSource
Plan sponsorACELYRIN, INC.Form 5500, Part II line 2a; SPONSOR_DFE_NAME pos 19; filing 20251125152226NAL0005260320001, received 2025-11-25
Plan nameACELYRIN, INC. 401(K) PROFIT SHARING PLANForm 5500, line 1a; PLAN_NAME pos 16; filing 20251125152226NAL0005260320001, received 2025-11-25
Sponsor EIN / plan number85-2406735 / 001Form 5500, line 2b; SPONS_DFE_EIN pos 44; filing 20251125152226NAL0005260320001, received 2025-11-25
Plan typesingle-employerForm 5500, Part I line A; TYPE_PLAN_ENTITY_CD pos 4; filing 20251125152226NAL0005260320001, received 2025-11-25
Sponsor locationAGOURA HILLS, CAForm 5500, line 2a; SPONS_DFE_MAIL_US_STATE pos 25; filing 20251125152226NAL0005260320001, received 2025-11-25
Industry (business code)541990, Professional, scientific, and technical servicesForm 5500, line 2d; BUSINESS_CODE pos 46; filing 20251125152226NAL0005260320001, received 2025-11-25
Plan year2024-01-01 to 2024-12-31Form 5500, Part I plan year; FORM_PLAN_YEAR_BEGIN_DATE pos 2; filing 20251125152226NAL0005260320001, received 2025-11-25
Filing received2025-11-25Form 5500, EFAST2 receipt date; DATE_RECEIVED pos 102; filing 20251125152226NAL0005260320001, received 2025-11-25
Final filingnoForm 5500, Part I line B; FINAL_FILING_IND pos 8; filing 20251125152226NAL0005260320001, received 2025-11-25
Amended filingyesForm 5500, Part I line B; AMENDED_IND pos 7; filing 20251125152226NAL0005260320001, received 2025-11-25
Participants, beginning of year127Form 5500, line 5; TOT_PARTCP_BOY_CNT pos 71; filing 20251125152226NAL0005260320001, received 2025-11-25
Active participants89Form 5500, line 6a(2); TOT_ACTIVE_PARTCP_CNT pos 72; filing 20251125152226NAL0005260320001, received 2025-11-25
Participants, end of year130Form 5500, line 6f; TOT_ACT_RTD_SEP_BENEF_CNT pos 77; filing 20251125152226NAL0005260320001, received 2025-11-25
Participants with an account balance120Form 5500, line 6g(2); PARTCP_ACCOUNT_BAL_CNT pos 78; filing 20251125152226NAL0005260320001, received 2025-11-25
Total assets, beginning of year$0Schedule H, Part I line 1f col (a); TOT_ASSETS_BOY_AMT pos 30; filing 20251125152226NAL0005260320001, received 2025-11-25
Total assets, end of year$10,398,507Schedule H, Part I line 1f col (b); TOT_ASSETS_EOY_AMT pos 61; filing 20251125152226NAL0005260320001, received 2025-11-25
Net assets, end of year$10,398,507Schedule H, line 1l col (b); NET_ASSETS_EOY_AMT pos 67; filing 20251125152226NAL0005260320001, received 2025-11-25
Total income$7,572,990Schedule H, Part II line 2d; TOT_INCOME_AMT pos 97; filing 20251125152226NAL0005260320001, received 2025-11-25
Net income$6,341,015Schedule H, line 2k; NET_INCOME_AMT pos 111; filing 20251125152226NAL0005260320001, received 2025-11-25
Employer contributions$752,710Schedule H, Part II line 2a(1)(A); EMPLR_CONTRIB_INCOME_AMT pos 68; filing 20251125152226NAL0005260320001, received 2025-11-25
Participant contributions$2,087,024Schedule H, line 2a(1)(B); PARTICIPANT_CONTRIB_AMT pos 69; filing 20251125152226NAL0005260320001, received 2025-11-25
Other contributions (incl. rollovers)$3,804,255Schedule H, line 2a(1)(C); OTH_CONTRIB_RCVD_AMT pos 70; filing 20251125152226NAL0005260320001, received 2025-11-25
Total contributions$6,643,989Schedule H, line 2a(3); TOT_CONTRIB_AMT pos 72; filing 20251125152226NAL0005260320001, received 2025-11-25
Benefit payments$1,213,863Schedule H, line 2e(4); TOT_DISTRIB_BNFT_AMT pos 101; filing 20251125152226NAL0005260320001, received 2025-11-25
Total expenses (incl. benefit payments)$1,231,975Schedule H, line 2j; TOT_EXPENSES_AMT pos 110; filing 20251125152226NAL0005260320001, received 2025-11-25
Total administrative expenses$18,112Schedule H, line 2i(12) total administrative expenses; TOT_ADMIN_EXPENSES_AMT pos 109; filing 20251125152226NAL0005260320001, received 2025-11-25
Contract administrator fees$18,112Schedule H, line 2i(2); CONTRACT_ADMIN_FEES_AMT pos 106; filing 20251125152226NAL0005260320001, received 2025-11-25
Administrative expenses excluding investment management$18,112derived, admin_expenses (2i(12)) minus invst_mgmt_fees (2i(5)), floored at 0; filing 20251125152226NAL0005260320001, received 2025-11-25
Held in mutual funds$10,349,403Schedule H, line 1c(13) col (b); INT_REG_INVST_CO_EOY_AMT pos 55; filing 20251125152226NAL0005260320001, received 2025-11-25
Independent auditorPENSION ASSURANCE LLPSchedule H, Part III line 3a; ACCOUNTANT_FIRM_NAME pos 116; filing 20251125152226NAL0005260320001, received 2025-11-25

Position = column in the DOL layout for form year 2024. Filing 20251125152226NAL0005260320001, received 2025-11-25.

Service providers paid directly by the plan

ProviderRelationshipService codesDirect compensationIndirect
EMPOWER ANNUITY INSURANCE COMPANYrecordkeeperRECORDKEEPER 64 Recordkeeping fees $18,112yes
NOVA 401(K) ASSOCIATESCONTRACT ADMIN 13 Contract administrator $0yes

Schedule C Part I line 2: name (a), service codes (b), relationship (c), direct compensation paid by the plan (d), indirect compensation received (e). Filing 20251125152226NAL0005260320001, received 2025-11-25.

No filing for the previous plan year is in the data, so there is no year-over-year comparison.

Alerts, claims and corrections

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Sponsor name as filed: ACELYRIN, INC.; SEC registrant: ACELYRIN, Inc. (CIK 1962918, matched by EIN; display name from the Form 10-K cover).