Castellum, Inc.: which funds bought and sold
Institutions that bought and sold Castellum shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.
Between March 31, 2026 and June 30, 2026, 18 institutions that filed 13F reports for both quarters added to or opened positions in Castellum, and 8 cut or closed them. Together they added a net 174K shares, +2.3% on what they held at the start of the quarter. 12 opened a new position and 4 sold out entirely.
Bought, Q2 2026 18 institutions, 12 of them new holders Sold, Q2 2026 8 institutions, 4 of them sold out
Net change, all compared +174K shares (+2.3%)
Net change, active managers 0 shares (0.0%), 0 bought, 0 sold
Buyers versus sellers
18 bought 13 8 sold
Active managers and hedge funds 0 bought · 0 sold · 0
Index fund managers 2 bought · 2 sold · −52K
Other institutions 16 bought · 6 sold · +227K
Biggest buyers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Virtu Financial LLC | +168K New position | 168K | $121,000 |
| Meridian Wealth Management, LLC | +77K +9.8% | 863K | $621,418 |
| Vanguard Fiduciary Trust Co Index funds | +74K +17.8% | 493K | $354,756 |
| Hub Investment Partners, LLC | +57K New position | 57K | $41,332 |
| UBS Group AG | +55K +36.1% | 209K | $150,450 |
| Arq Wealth Advisors, LLC | +35K New position | 35K | $22,750 |
| Creative Planning | +30K +146.1% | 50K | $35,995 |
| Two Sigma Securities, LLC | +25K +166.3% | 41K | $29,178 |
| Xtx Topco Ltd | +22K New position | 22K | $15,773 |
| Act Advisors, Llc. | +21K New position | 21K | $15,171 |
| Pks Advisory Services, LLC | +19K New position | 19K | $13,628 |
| Vanguard Capital Management LLC Index funds | +13K +0.4% | 3.1M | $2.2M |
| Tower Research Capital LLC (TRC) | +5,872 New position | 5,872 | $4,227 |
| Cape Investment Advisory, Inc. | +2,000 New position | 2,000 | $1,440 |
| TD Waterhouse Canada Inc. | +500 New position | 500 | $361 |
| Osaic Holdings, Inc. | +215 New position | 215 | $154 |
| Harbour Investments, Inc. | +150 New position | 150 | $108 |
| Clearstead Advisors, LLC | +100 New position | 100 | $72 |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| None of the active managers on our list. | |||
Biggest sellers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Geode Capital Management, LLC Index funds | −129K −13.6% | 816K | $587,637 |
| Sei Investments Co | −122K Sold out | 0 | — |
| Jane Street Group, LLC | −108K −45.5% | 129K | $92,918 |
| HRT Financial LP | −34K Sold out | 0 | — |
| Ground Swell Capital, LLC | −21K Sold out | 0 | — |
| Northern Trust Corp Index funds | −10K −5.8% | 171K | $123,405 |
| Citigroup Inc | −7,040 Sold out | 0 | — |
| Savvy Advisors, Inc. | −1,500 −0.7% | 220K | $158,594 |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| None of the active managers on our list. | |||
New positions
| Institution | Shares | Value June 30, 2026 |
|---|---|---|
| Virtu Financial LLC | 168K | $121,000 |
| Hub Investment Partners, LLC | 57K | $41,332 |
| Arq Wealth Advisors, LLC | 35K | $22,750 |
| Xtx Topco Ltd | 22K | $15,773 |
| Act Advisors, Llc. | 21K | $15,171 |
| Pks Advisory Services, LLC | 19K | $13,628 |
| Tower Research Capital LLC (TRC) | 5,872 | $4,227 |
| Cape Investment Advisory, Inc. | 2,000 | $1,440 |
| TD Waterhouse Canada Inc. | 500 | $361 |
| Osaic Holdings, Inc. | 215 | $154 |
Sold out
| Institution | Shares | Value March 31, 2026 |
|---|---|---|
| Sei Investments Co | 122K | $71,668 |
| HRT Financial LP | 34K | $19,000 |
| Ground Swell Capital, LLC | 21K | $12,433 |
| Citigroup Inc | 7,040 | $4,150 |
Who holds the shares
- Institutions reporting
- 35
- Ten largest holders
- 89.3% of 13F-reported shares
- Index fund managers
- 65.0% of 13F-reported shares
- Active managers and hedge funds
- 1.2% of 13F-reported shares
| Type | Bought | Sold | New | Sold out | Net change in shares | Net % |
|---|---|---|---|---|---|---|
| Active managers and hedge funds | 0 | 0 | 0 | 0 | 0 | 0.0% |
| Index fund managers | 2 | 2 | 0 | 0 | −52K | −1.0% |
| Other institutions | 16 | 6 | 12 | 4 | +227K | +9.3% |