Nierenberg Investment Management Company, LLC holds a concentrated book of 35 stocks worth $201.4M as of Q2 2026 (disclosed Aug 11, 2026, a ~42-day 13F lag). This quarter they opened Haemonetics Corp/mass and trimmed Ishares 0-3 Month Treasury B. Their largest long position is Ishares 0-3 Month Treasury B at 23% of the equity book. Cloning the disclosed picks since 2024 would be +0% (+0.0%/yr). That is a simulation of the disclosed long book, not audited returns.
The reported book (valued from quarter-end) returned +12.6%, a 12.5-point gap that is the cost of the ~42-day 13F disclosure lag a real follower can't avoid.
Growth of $10,000 cloning Nierenberg Investment Management Company, LLC's disclosed long 13F book, rebalanced on each filing date (so it reflects each quarter's actual reporting lag, ~42 days for the latest filing, with no look-ahead), total-return basis (dividends reinvested), derived from end-of-day prices. “Their reported book” values the same picks from quarter-end, before they were public. S&P 500 is SPY total return over the same window. Excludes shorts, cash, options and non-13F holdings. Not investment advice.
Top-heavy: concentrated book
Share of the disclosed book in its largest positions. A higher top-5 share means a more concentrated, higher-conviction portfolio.
77% mapped to company sectors
Direct operating-company sectors from our SIC-based security master. ETF/fund and unclassified holdings stay visible separately; this is not ETF look-through exposure.
Estimated $ traded · quarter-end prices, no cost basis
Other tracked managers holding the same core names as Nierenberg Investment Management Company, LLC
| Manager / fund | Shared names | Their $ in those |
|---|---|---|
| BlackRock, Inc. | 68 / 35 | $37.2B |
| MORGAN STANLEY | 68 / 35 | $8.9B |
| UBS Group AG | 68 / 35 | $4.2B |
| GEODE CAPITAL MANAGEMENT, LLC | 67 / 35 | $10.2B |
| GOLDMAN SACHS GROUP INC | 67 / 35 | $3.8B |
| NORTHERN TRUST CORP | 67 / 35 | $3.5B |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 67 / 35 | $559.1M |
| VANGUARD CAPITAL MANAGEMENT LLC | 66 / 35 | $22.5B |
Ranked by how many of Nierenberg Investment Management Company, LLC's top 35 disclosed names each fund also holds: a cross-fund conviction signal from the latest 13F of every tracked manager.
Bars show each stock's share of the portfolio. Click a row for its position history.
| # | Security | Value | Shares | % Port | Last move | History |
|---|---|---|---|---|---|---|
| 1 | Ishares TR 0-3 MTH TREASURY | $46.4M | 461.0K | 23.0% | ▼−16% Reduced · −90K sh | |
| 2 | Eqt Corp COM | $28.4M | 533.4K | 14.1% | —Held | |
| 3 | Criteo S A SPONS ADS | $19.2M | 1.05M | 9.6% | —Held | |
| 4 | Lyft Inc CL A COM | $18.9M | 1.30M | 9.4% | —Held | |
| 5 | Maplebear Inc COM | $13.8M | 291.9K | 6.9% | —Held | |
| 6 | KBR Inc COM | $13.3M | 386.4K | 6.6% | —Held | |
| 7 | Riverview Bancorp Inc COM | $11.0M | 2.03M | 5.5% | —Held | |
| 8 | Fti Consulting Inc COM | $11.0M | 73.9K | 5.5% | ▲+655% Added · +64K sh | |
| 9 | Rocket Cos Inc COM CL A | $6.8M | 429.6K | 3.4% | —Held | |
| 10 | Green Dot Corp CL A | $4.6M | 339.1K | 2.3% | —Held | |
| 11 | Diversified Healthcare TR COM SH BEN INT | $4.2M | 456.1K | 2.1% | —Held | |
| 12 | Brookdale SR Living Inc COM | $4.1M | 255.1K | 2.0% | —Held | |
| 13 | Five9 Inc COM | $2.9M | 135.8K | 1.4% | —Held | |
| 14 | Tandem Diabetes Care Inc COM NEW | $2.4M | 158.9K | 1.2% | ▲+100% Added · +79K sh | |
| 15 | Haemonetics Corp Mass COM | $2.0M | 26.3K | 1.0% | ▲New New position | |
| 16 | Greenlight Cap Re Ltd CLASS A | $1.7M | 102.5K | 0.8% | —Held | |
| 17 | Ring Energy Inc COM | $1.5M | 1.40M | 0.8% | ▲New New position | |
| 18 | Concentrix Corp COM | $1.4M | 64.5K | 0.7% | —Held | |
| 19 | Expand Energy Corporation COM | $1.4M | 15.6K | 0.7% | —Held | |
| 20 | Forrester Resh Inc COM | $1.1M | 131.1K | 0.5% | —Held | |
| 21 | Helix Energy Solutions Grp I COM | $1.1M | 124.5K | 0.5% | —Held | |
| 22 | DXC Technology Co COM | $907K | 102.5K | 0.5% | —Held | |
| 23 | Oshkosh Corp COM | $883K | 5.8K | 0.4% | —Held | |
| 24 | Ttec Hldgs Inc COM | $496K | 255.6K | 0.2% | —Held | |
| 25 | Techtarget Inc COM NEW | $493K | 136.9K | 0.2% | ▼−33% Reduced · −66K sh | |
| 26 | Fluor Corp COM | $343K | 6.6K | 0.2% | —Held | |
| 27 | Dhi Group Inc COM | $314K | 84.6K | 0.2% | —Held | |
| 28 | Orasure Technologies Inc COM | $248K | 55.6K | 0.1% | —Held | |
| 29 | Arhaus Inc COM CL A | $104K | 12.3K | 0.1% | —Held | |
| 30 | Oil STS Intl Inc COM | $93K | 11.6K | 0.0% | —Held | |
| 31 | Talkspace Inc COM | $60K | 11.6K | 0.0% | —Held | |
| 32 | NN Inc COM | $49K | 13.6K | 0.0% | —Held | |
| 33 | Cytomx Therapeutics Inc. COM | $47K | 12.6K | 0.0% | —Held | |
| 34 | W & T Offshore Inc COM | $43K | 13.6K | 0.0% | —Held | |
| 35 | Conduent Inc COM | $26K | 17.6K | 0.0% | ▲New New position |
The public view is the crawlable proof. The same sourced dataset is available through REST and MCP for agents, research scripts, and back-office tools.
This fund page is the Follow view. The Build view lets your agent pull holdings, quarter changes, overlap, and source filings through API or MCP.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/funds/1282683/holdings"
Use Arkolith to show Nierenberg Investment Management Company, LLC's latest holdings, largest changes, and filing provenance.
As-of date vs the date the SEC received each filing
| Quarter | As of | Filed | Positions | Value | Form |
|---|---|---|---|---|---|
| Q2 2026 | Jun 30, 2026 | Aug 11, 2026 | 35 | $201.4M | 13F-HR |
| Q1 2026 | Mar 31, 2026 | May 13, 2026 | 46 | $201.5M | 13F-HR |
| Q4 2025 | Dec 31, 2025 | Feb 13, 2026 | 47 | $206.0M | 13F-HR |
| Q3 2025 | Sep 30, 2025 | Nov 12, 2025 | 52 | $234.0M | 13F-HR |
| Q2 2025 | Jun 30, 2025 | Aug 11, 2025 | 49 | $188.2M | 13F-HR |
| Q1 2025 | Mar 31, 2025 | May 13, 2025 | 57 | $183.2M | 13F-HR |
| Q4 2024 | Dec 31, 2024 | Feb 13, 2025 | 51 | $180.2M | 13F-HR |
| Q3 2024 | Sep 30, 2024 | Nov 13, 2024 | 54 | $176.5M | 13F-HR |
Holdings from SEC EDGAR 13F-HR filings, updated quarterly, filed up to 45 days after quarter-end. Public domain. The book and weighting are long equity only; disclosed put/call options are listed separately and excluded from those totals. The performance line is a simulation of the disclosed long book, not an audited return.