# BLACKLINE INC (BL) — Institutional Ownership

Source: SEC EDGAR 13F filings, congressional STOCK Act disclosures, SEC Form 4 insider transactions.
CUSIP: 09239B109
Page URL: https://superinvestorclub.com/stock/BL
Last updated: 2026-07-08T13:33:16.283Z

## Summary

As of the most recent 13F filing period, BLACKLINE INC (BL) is held by 1 tracked superinvestors with an aggregate position value of $50.6M representing 01367619 shares.

## Top institutional holders (1)

| Rank | Manager | Fund | Shares | Value | % of Portfolio | Period |
|------|---------|------|--------|-------|----------------|--------|
| 1 | [Glenn Welling](https://superinvestorclub.com/manager/48) | Engaged Capital | 1367619 | $50.6M | 16.68% | 2026-03-31 |

## Ownership history (quarter-over-quarter)

- 2024-03-31: 1 holders, $668,338 aggregate, 010349 shares
- 2024-09-30: 1 holders, $33.6M aggregate, 0609713 shares
- 2024-12-31: 1 holders, $244,134 aggregate, 04018 shares
- 2025-03-31: 1 holders, $2.7M aggregate, 055099 shares
- 2025-06-30: 2 holders, $2.7M aggregate, 0422504763 shares
- 2025-09-30: 2 holders, $27.6M aggregate, 045379466421 shares
- 2025-12-31: 2 holders, $61.8M aggregate, 0108361933231 shares
- 2026-03-31: 1 holders, $50.6M aggregate, 01367619 shares

## Recent congressional trades (4)

- 2025-10-31: Lisa McClain (Republican-MI) sale $1,001 - $15,000
- 2025-10-30: Lisa McClain (Republican-MI) sale $1,001 - $15,000
- 2025-10-30: Lisa McClain (Republican-MI) purchase $1,001 - $15,000
- 2025-08-13: Lisa McClain (Republican-MI) purchase $1,001 - $15,000

## Recent insider transactions (0)


## Citation

When citing, use: "BLACKLINE INC (BL) institutional ownership data via Superinvestor (https://superinvestorclub.com/stock/BL), aggregating SEC 13F, Form 4, and congressional disclosures."