APM
Aptorum Group LtdCompany with tickers: APM
CIK
1734005
CUSIP
G6096M122
Shares Outstanding
6,346,823
Website
https://www.aptorumgroup.com
13F Activity (30d)
6 filings
6 filers
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Holders: 8
Total Value: $124,566
Total Shares: 156,494
Institutional Ownership Trend
13 quarters
Holder Concentration
Across 8 13F filers · Δ vs Dec 31, 2025Top Holder
59.1%
−9.0 pts
Top 5
95.4%
−4.6 pts
Top 10
100.0%
0.0 pts
HHI
3,838
Highly concentrated−1,343
Quarterly Activity
vs Dec 31, 2025
New
5
Increased
0
Decreased
2
Sold Out
2
Unchanged
1
Holder count:
+3
Institutional value:
+359.7%
Shares held:
+512.1%
Top Buyers
vs Dec 31, 2025No qualifying movers this quarter.
Top Sellers
vs Dec 31, 2025| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Mega UBS Group AG | −618 | 1,629 | |
| Large OSAIC HOLDINGS, INC. | −1 | 5,500 |
Top New Positions
vs Dec 31, 2025| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Mega CITADEL ADVISORS LLC | 92,420 | $73,566 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | 16,777 | $13,354 | |
| Mid XTX Topco Ltd | 15,061 | $11,988 | |
| Mega MORGAN STANLEY | 13,262 | $10,556 | |
| Large RENAISSANCE TECHNOLOGIES LLC | 11,838 | $9,423 |
Top Sold-Out Positions
vs Dec 31, 2025| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Mega TWO SIGMA INVESTMENTS, LP | 17,411 | $18,455 | |
| Mega BNP PARIBAS ARBITRAGE, SA | 400 | $424 |
| Holder | Value (USD) | % of 13F | Shares | Type | Discretion | Filed | Open | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Mega CITADEL ADVISORS LLC | $73,566 | 59.06% | 92,420 | Shares | Defined | 2026-05-15 | ||||
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $13,354 | 10.72% | 16,777 | Shares | Other | 2026-05-15 | ||||
| Mid XTX Topco Ltd | $11,988 | 9.62% | 15,061 | Shares | Defined | 2026-05-15 | ||||
| Mega MORGAN STANLEY | $10,556 | 8.47% | 13,262 | Shares | Defined | 2026-05-15 | ||||
| Large RENAISSANCE TECHNOLOGIES LLC | $9,423 | 7.56% | 11,838 | Shares | Sole | 2026-05-14 | ||||
| Large OSAIC HOLDINGS, INC. | $4,378 | 3.51% | 5,500 | Shares | Defined | 2026-05-15 | ||||
| Mega UBS Group AG | $1,296 | 1.04% | 1,629 | Shares | Defined | 2026-05-05 | ||||
| Mid SBI Securities Co., Ltd. Broker-Dealer | $5 | 0.00% | 7 | Shares | Defined | 2026-04-28 | ||||
| No holders match your search. | ||||||||||