republic-os/legislation/us/states/co/2025b/sb-4.md

---
type: "Bill"
title: "Increase Transparency for Algorithmic Systems"
description: "In 2024, the general assembly enacted Senate Bill 24-205, which created consumer protections in interactions with artificial intelligence systems. The act extends the effective date of the requirements of Senate Bill 24-205 to June 30, 2026.APPROVED by Governor August 28, 2025EFFECTIVE November 25, 2025(Note: This summary applies to this bill as enacted.)"
jurisdiction: "us/states/co"
legislature: "Colorado General Assembly"
session: "2025B"
identifier: "SB 4"
citation: "Colorado SB 4 (2025B)"
classification: ["bill"]
subjects: ["Business & Economic Development", "Labor & Employment", "Telecommunications & Information Technology"]
status: "enacted"
primary_sponsors: ["J. Bacon", "R. Rodriguez"]
version_count: 7
action_count: 15
vote_count: 14
first_action: "2025-08-21"
last_action: "2025-08-28"
source: "openstates"
source_identifier: "ocd-bill/f0d0ff0b-fa16-4f61-aebb-4c30d63d073b"
source_url: "https://leg.colorado.gov/bills/SB25B-004"
source_hash: "c98496a74a6fcb6a2d57e2274a7596c5179f4b9cf66759da2785de012fd1d957"
vintage: "2026-07-01"
source_snapshot: "https://data.openstates.org/daily/2026-07-01/public.pgdump"
retrieved_at: "2026-07-06"
confidence: "reported"
tags: ["legislation", "bill", "us-co"]
---

# Colorado SB 4 (2025B) — Increase Transparency for Algorithmic Systems

In 2024, the general assembly enacted Senate Bill 24-205, which created consumer protections in interactions with artificial intelligence systems. The act extends the effective date of the requirements of Senate Bill 24-205 to June 30, 2026.APPROVED by Governor August 28, 2025EFFECTIVE November 25, 2025(Note: This summary applies to this bill as enacted.)

## Version chain

The bill's text revisions, in order — the diff chain from filing to enrollment.

1. **Introduced** (filed) — [source](https://s3.us-west-2.amazonaws.com/beta.leg.colorado.gov/51e7c090e3f68934519a55909435f065)
2. **Engrossed** (committee substitute) — [source](https://s3.us-west-2.amazonaws.com/beta.leg.colorado.gov/56f4f0b00096922a9ef7a162e76f9081)
3. **Final Act** (committee substitute) — [source](https://s3.us-west-2.amazonaws.com/beta.leg.colorado.gov/45c57718d6fb4dd5df0729e1b316ba0a)
4. **Reengrossed** (committee substitute) — [source](https://s3.us-west-2.amazonaws.com/beta.leg.colorado.gov/04147396d15eee60b290a7c2b4e39e2d)
5. **Rerevised** (committee substitute) — [source](https://s3.us-west-2.amazonaws.com/beta.leg.colorado.gov/0aa95321e70a868c66e10ad6c884cfb9)
6. **Revised** (committee substitute) — [source](https://s3.us-west-2.amazonaws.com/beta.leg.colorado.gov/34ab9e99423e1cb9c04d1df0e2ec4798)
7. **Signed Act** (committee substitute) — [source](https://s3.us-west-2.amazonaws.com/beta.leg.colorado.gov/7f9f16ac78b35ebefefda426135ad19d)

## Votes

- Adopt amendment L.018 — **pass** (pass) · upper
- Adopt amendment L.020 — **pass** (pass) · upper
- Adopt amendment J.006 — **pass** (pass) · upper
- BILL — **pass** (pass) · lower
- Adopt amendment L.005 — **pass** (pass) · upper
- Refer Senate Bill 25B-004, as amended, to the Committee of the Whole. — **pass** (pass) · upper
- Adopt amendment L.003 — **pass** (pass) · upper
- PERM — **fail** (fail) · lower
- Adopt amendment L.002 — **pass** (pass) · upper
- Refer Senate Bill 25B-004, as amended, to the Committee on Appropriations. — **pass** (pass) · upper
- Refer Senate Bill 25B-004, as amended, to the Committee of the Whole. — **pass** (pass) · upper
- Adopt amendment L.011 — **pass** (pass) · upper
- Adopt amendment L.040 — **pass** (pass) · upper
- Adopt amendment L.001 — **pass** (pass) · upper

## Sponsors

- J. Bacon — primary (person)
- R. Rodriguez — primary (person)
- B. Kirkmeyer — cosponsor (person)
- B. Pelton — cosponsor (person)
- C. Espenoza — cosponsor (person)
- C. Simpson — cosponsor (person)
- J. Amabile — cosponsor (person)
- J. Coleman — cosponsor (person)
- J. Gonzales — cosponsor (person)
- J. Marchman — cosponsor (person)
- J. McCluskie — cosponsor (person)
- L. Frizell — cosponsor (person)
- M. Baisley — cosponsor (person)
- M. Ball — cosponsor (person)
- M. Carter — cosponsor (person)
- M. Duran — cosponsor (person)
- M. Snyder — cosponsor (person)
- R. Gonzalez — cosponsor (person)
- R. Pugliese — cosponsor (person)
- R. Taggart — cosponsor (person)
- S. Bird — cosponsor (person)
- T. Exum — cosponsor (person)
- W. Lindstedt — cosponsor (person)

## Timeline

The legislative action history — every referral, reading, and vote.

- **2025-08-28** Governor Signed `executive-signature`
- **2025-08-26** Sent to the Governor `executive-receipt`
- **2025-08-26** Signed by the Speaker of the House `passage`
- **2025-08-26** Signed by the President of the Senate `passage`
- **2025-08-26** Senate Considered House Amendments - Result was to Concur - Repass
- **2025-08-26** House Third Reading Passed - No Amendments `passage, reading-3`
- **2025-08-25** House Second Reading Special Order - Passed with Amendments - Committee
- **2025-08-25** House Committee on Appropriations Refer Amended to House Committee of the Whole `committee-passage, referral-committee`
- **2025-08-25** Introduced In House - Assigned to Appropriations `introduction`
- **2025-08-25** Senate Third Reading Passed with Amendments - Floor `passage, reading-3`
- **2025-08-24** Senate Second Reading Special Order - Passed with Amendments - Committee, Floor
- **2025-08-24** Senate Committee of the Whole Amendment - Change from Passed to Lost
- **2025-08-24** Senate Committee on Appropriations Refer Amended to Senate Committee of the Whole `committee-passage, referral-committee`
- **2025-08-21** Senate Committee on Business, Labor, & Technology Refer Amended to Appropriations `referral-committee`
- **2025-08-21** Introduced In Senate - Assigned to Business, Labor, & Technology `introduction`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/f0d0ff0b-fa16-4f61-aebb-4c30d63d073b`. Confidence: reported (aggregated from official Colorado legislature records).