Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$272M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$99M |
| 3 |
NVIDIA
NVDA
|
+$89.9M |
| 4 |
TSMC
TSM
|
+$87.7M |
| 5 |
Amazon
AMZN
|
+$61M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$518M |
| 2 |
Strategy Inc
MSTR
|
+$81.2M |
| 3 |
Alibaba
BABA
|
+$66.7M |
| 4 |
Advanced Micro Devices
AMD
|
+$44.3M |
| 5 |
Uber
UBER
|
+$41.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Consumer Discretionary | 0.22% |
| 3 | Healthcare | 0.17% |
| 4 | Communication Services | 0.15% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4851
CALL
Kayne Anderson Energy Infrastructure Fund
KYN
$2.45B
| $123K | ﹤0.01% |
9,600
+2,700
| +39% | +$34.8K |
|
4852
CALL
Bio-Techne
TECH
$11.2B
| $123K | ﹤0.01% |
2,100
-5,700
| -73% | -$386K |
|
4853
Bit Digital
BTBT
$502M
| $122K | ﹤0.01% |
60,460
-40,626
| -40% | -$117K |
|
4854
CALL
EVgo
EVGO
$236M
| $122K | ﹤0.01% |
46,100
-446,500
| -91% | -$1.38M |
|
|
EXK
4855
PUT
Endeavour Silver
EXK
$2.3B
| $122K | ﹤0.01% |
28,700
-50,200
| -64% | -$202K |
|
4856
LPL Financial
LPLA
$27.1B
| $122K | ﹤0.01% |
+375
| New | +$131K |
|
|
MAXN
4857
CALL
DELISTED
Maxeon Solar Technologies
MAXN
| $122K | ﹤0.01% |
41,600
-682,000
| -94% | -$3.46M |
|
4858
CALL
Sagimet Biosciences
SGMT
$451M
| $122K | ﹤0.01% |
37,600
+31,500
| +516% | +$132K |
|
|
SRDX
4859
PUT
DELISTED
Surmodics
SRDX
| $122K | ﹤0.01% |
4,000
| – | – |
|
4860
Archrock
AROC
$6.21B
| $121K | ﹤0.01% |
+4,624
| New | +$125K |
|
4861
Gerdau
GGB
$9.74B
| $121K | ﹤0.01% |
42,668
+42,471
| +21,559% | +$124K |
|
4862
PUT
Highwoods Properties
HIW
$3.73B
| $121K | ﹤0.01% |
4,100
+1,500
| +58% | +$43.8K |
|
|
HUYA
4863
CALL
Huya Inc
HUYA
$570M
| $121K | ﹤0.01% |
37,700
+27,400
| +266% | +$98.8K |
|
|
LNW
4864
CALL
DELISTED
Light & Wonder
LNW
| $121K | ﹤0.01% |
1,400
+1,300
| +1,300% | +$125K |
|
4865
CALL
Organogenesis Holdings
ORGO
$315M
| $121K | ﹤0.01% |
28,100
+23,600
| +524% | +$95.3K |
|
|
SKE
4866
Skeena Resources
SKE
$3.39B
| $121K | ﹤0.01% |
+12,049
| New | +$121K |
|
4867
CALL
SLR Investment Corp
SLRC
$696M
| $121K | ﹤0.01% |
7,200
+2,500
| +53% | +$42.6K |
|
4868
PUT
Ametek
AME
$55B
| $120K | ﹤0.01% |
700
+500
| +250% | +$90.9K |
|
4869
PUT
Arqit Quantum
ARQQ
$308M
| $120K | ﹤0.01% |
+8,700
| New | +$171K |
|
4870
CALL
AXIS Capital
AXS
$7.67B
| $120K | ﹤0.01% |
1,200
-3,400
| -74% | -$314K |
|
4871
Global X Blockchain & Bitcoin Strategy ETF
BITS
$24M
| $120K | ﹤0.01% |
2,373
-48,450
| -95% | -$3.12M |
|
4872
CALL
Deluxe
DLX
$1.19B
| $120K | ﹤0.01% |
7,600
+700
| +10% | +$13.3K |
|
4873
Euronet Worldwide
EEFT
$2.92B
| $120K | ﹤0.01% |
1,129
-514
| -31% | -$52.1K |
|
4874
PUT
iRadimed
IRMD
$1.22B
| $120K | ﹤0.01% |
2,300
| – | – |
|
4875
MannKind Corp
MNKD
$1.27B
| $120K | ﹤0.01% |
23,920
-1,196
| -5% | -$6.7K |
|
Similar funds
Simplex Trading's Q1 2025 Portfolio in Review
As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.
- Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
- Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
- Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
- Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
- Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
- Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
- Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.