# Primecap Management Co

> Primecap Management Co is an SEC-registered investment advisory firm in Pasadena, CA, registered since 1983, reporting over $5 billion in regulatory assets under management in its Form ADV filing dated July 29, 2026.

- CRD: 105516
- Filed as: PRIMECAP MANAGEMENT CO
- Registration: SEC-registered investment adviser (status as filed: Approved)
- Location: Pasadena, CA
- Filing period: October 2026
- Form ADV filing dated: July 29, 2026
- SEC record (IAPD): https://adviserinfo.sec.gov/firm/summary/105516
- AdvisorCensus page: https://advisorcensus.com/firm/primecap-management-co-pasadena-ca-105516

## Quick answers

**How is Primecap Management Co compensated?**
On its Form ADV (Item 5.E, October 2026), Primecap Management Co reports these compensation arrangements: a percentage of assets under its management. The amounts are in Item 5 of its Form ADV Part 2A brochure.

**Where is Primecap Management Co located?**
Primecap Management Co's principal office is in Pasadena, CA, according to its Form ADV.

**Is Primecap Management Co registered with the SEC or a state?**
Primecap Management Co is an SEC-registered investment advisory firm, registered since 1983. Status as filed: Approved. CRD 105516.

**How much does Primecap Management Co manage?**
Primecap Management Co reports $139,344,370,550 in regulatory assets under management in its Form ADV filing dated July 29, 2026 (100% discretionary).

**How have Primecap Management Co's assets and staff changed since 2021?**
In the Form ADV data for Primecap Management Co: Regulatory assets under management: $142,895,246,708 in the October 2021 data and $139,344,370,550 in the October 2026 data, down 2%. Total employees: 43 in October 2021 and 43 in October 2026. Assets under management move with markets as well as with clients coming and going.

**What types of clients does Primecap Management Co serve?**
By number of clients on Form ADV Item 5.D: pension and profit sharing plans (but not the plan participants or government pension plans) (5); charitable organizations (4); investment companies (2).

**Which custodians does Primecap Management Co use?**
Primecap Management Co's most recent Form ADV filing (Schedule D, Section 5.K(3)) lists The Northern Trust Company as a custodian holding 10% or more of its separately managed account assets.

**Does Primecap Management Co report any disciplinary disclosures?**
Reports no disclosure items on Form ADV Item 11. The detail of any item is on the firm's SEC record: https://adviserinfo.sec.gov/firm/summary/105516

**What changed in Primecap Management Co's recent Form ADV filings?**
In the April 2026 filing data: Employees performing advisory functions went from 19 to 22.

## From the Form ADV filing

### Compensation (Item 5.E)
- A percentage of assets under your management

### Custodians (Schedule D, Section 5.K(3))
- The Northern Trust Company

Custodians holding 10% or more of the firm's separately managed account assets, as filed on Form ADV (Schedule D, Section 5.K(3)). A custodian holds client assets; it does not endorse or supervise the firm. AdvisorCensus has no relationship with any custodian.

### Regulatory assets under management (Item 5.F)
- Total: $139,344,370,550
- Discretionary: $139,344,370,550
- Non-discretionary: $0

### Clients (Item 5.D)

| Client type | Clients | Assets |
| --- | --- | --- |
| Individuals (other than high net worth individuals) | 0 | $0 |
| High net worth individuals | 0 | $0 |
| Banking or thrift institutions | 0 | $0 |
| Investment companies | 2 | $133,452,111,991 |
| Business development companies | 0 | $0 |
| Pooled investment vehicles (other than investment companies and business development companies) | 1 | $1,259,083,033 |
| Pension and profit sharing plans (but not the plan participants or government pension plans) | 5 | $1,216,059,921 |
| Charitable organizations | 4 | $611,738,722 |
| State or municipal government entities (including government pension plans) | 0 | $0 |
| Other investment advisers | 0 | $0 |
| Insurance companies | 0 | $0 |
| Sovereign wealth funds and foreign official institutions | 1 | $2,805,376,883 |
| Corporations or other businesses not listed above | 0 | $0 |
| Other | 0 | $0 |

### Advisory services (Item 5.G)
- Portfolio management for investment companies (and business development companies)
- Portfolio management for pooled investment vehicles (other than investment companies)
- Portfolio management for businesses (other than small businesses) or institutional clients

### Firm details
- Registered since: 1983 (43 years)
- Employees: 43 total, 22 performing advisory functions
- Wrap fee program participation: No
- States registered or notice-filed: CA
- Disclosures (Item 11): Reports no disclosure items on Form ADV Item 11.

### Websites listed on Form ADV (Item 1.I)
- primecap.com

## Assets and staff over time

| Data period | Regulatory assets under management | Employees | Filing dated |
| --- | --- | --- | --- |
| October 2021 | $142,895,246,708 | 43 | March 29, 2021 |
| October 2022 | $153,658,443,874 | 44 | March 30, 2022 |
| October 2023 | $117,232,900,412 | 44 | March 29, 2023 |
| October 2024 | $134,476,880,987 | 40 | July 8, 2024 |
| October 2025 | $135,873,993,240 | 40 | April 8, 2025 |
| October 2026 | $139,344,370,550 | 43 | July 29, 2026 |

Regulatory assets under management: $142,895,246,708 in the October 2021 data and $139,344,370,550 in the October 2026 data, down 2%.
Total employees: 43 in October 2021 and 43 in October 2026.

## Changes in the filing (last 12 months)

### April 2026
- Employees performing advisory functions went from 19 to 22.

## Source

Form ADV as filed, October 2026. Values appear as filed. Cite as: AdvisorCensus. Primecap Management Co (CRD 105516): Form ADV filing data as of October 2026.