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 |
Amazon
AMZN
|
+$168M |
| 2 |
NVIDIA
NVDA
|
+$141M |
| 3 |
TSMC
TSM
|
+$121M |
| 4 |
Meta Platforms (Facebook)
META
|
+$107M |
| 5 |
SPDR Gold Trust
GLD
|
+$103M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$174M |
| 2 |
Western Digital
WDC
|
+$87.7M |
| 3 |
Broadcom
AVGO
|
+$62.2M |
| 4 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$52M |
| 5 |
Netflix
NFLX
|
+$44.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.62% |
| 2 | Communication Services | 0.22% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Healthcare | 0.2% |
| 5 | Industrials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4776
PUT
Global X MSCI Norway ETF
NORW
$86.5M
| $131K | ﹤0.01% |
1,400
-7,500
| -84% | -$255K |
|
4777
NETGEAR
NTGR
$669M
| $131K | ﹤0.01% |
+5,976
| New | +$129K |
|
4778
UL Solutions
ULS
$17.2B
| $130K | ﹤0.01% |
+1,522
| New | +$120K |
|
4779
PUT
Commerce Bancshares
CBSH
$8.5B
| $130K | ﹤0.01% |
2,650
+1,395
| +111% | +$72.4K |
|
4780
Mistras Group
MG
$492M
| $130K | ﹤0.01% |
8,798
-10,997
| -56% | -$159K |
|
4781
Allogene Therapeutics
ALLO
$601M
| $130K | ﹤0.01% |
53,282
+47,149
| +769% | +$94.5K |
|
4782
PUT
Kiniksa Pharmaceuticals
KNSA
$4.83B
| $130K | ﹤0.01% |
+2,700
| New | +$120K |
|
4783
PUT
Monte Rosa Therapeutics
GLUE
$1.92B
| $130K | ﹤0.01% |
7,900
-65,600
| -89% | -$1.25M |
|
4784
PUT
Novanta
NOVT
$5.04B
| $130K | ﹤0.01% |
1,100
+1,000
| +1,000% | +$131K |
|
4785
Jefferies Financial Group
JEF
$12.9B
| $130K | ﹤0.01% |
+3,142
| New | +$163K |
|
4786
CALL
Allegiant Air
ALGT
$2.64B
| $130K | ﹤0.01% |
1,600
-8,400
| -84% | -$773K |
|
4787
CALL
Sanmina
SANM
$11.2B
| $130K | ﹤0.01% |
1,000
-6,100
| -86% | -$896K |
|
4788
PUT
Hexcel
HXL
$8.32B
| $129K | ﹤0.01% |
1,600
+900
| +129% | +$75.8K |
|
4789
iShares US Telecommunications ETF
IYZ
$1.19B
| $129K | ﹤0.01% |
+3,285
| New | +$123K |
|
4790
PUT
CEVA Inc
CEVA
$1.01B
| $129K | ﹤0.01% |
6,900
+6,800
| +6,800% | +$143K |
|
4791
CALL
SLR Investment Corp
SLRC
$706M
| $129K | ﹤0.01% |
9,000
+3,100
| +53% | +$46K |
|
4792
McEwen Inc
MUX
$1.03B
| $129K | ﹤0.01% |
6,306
-89,383
| -93% | -$2.12M |
|
4793
CALL
Surgery Partners
SGRY
$2.06B
| $129K | ﹤0.01% |
10,800
+8,500
| +370% | +$122K |
|
4794
Direxion Daily Technology Bear 3x ETF
TECS
$78.2M
| $129K | ﹤0.01% |
+623
| New | +$113K |
|
4795
Hubbell
HUBB
$25.7B
| $129K | ﹤0.01% |
262
-541
| -67% | -$266K |
|
4796
CALL
Diebold Nixdorf
DBD
$3.09B
| $128K | ﹤0.01% |
+1,700
| New | +$125K |
|
4797
PUT
Better Home & Finance Holding
BETR
$412M
| $128K | ﹤0.01% |
+3,600
| New | +$115K |
|
|
VELO
4798
Velo3D Inc
VELO
$288M
| $128K | ﹤0.01% |
+13,647
| New | +$187K |
|
|
NEWP
4799
CALL
New Pacific Metals
NEWP
$833M
| $128K | ﹤0.01% |
30,900
-30,100
| -49% | -$122K |
|
4800
CALL
American Financial Group
AFG
$11.9B
| $128K | ﹤0.01% |
+1,000
| New | +$130K |
|
Similar funds
Simplex Trading's Q1 2026 Portfolio in Review
As of Q1 2026, Simplex Trading held 10,500 positions worth $149B, down 16% from $177B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading withdrew a net $18.1B in Q1 2026, closing 1,574 positions and reducing 3,926 holdings. Its most notable exit was Direxion Daily Semiconductor Bull 3X ETF, an estimated $52M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.62% of assets, up from 0.59% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in Amazon worth $159M.
- Simplex Trading's largest Q1 2026 buy was Amazon: 764,884 shares worth $159M.
- Simplex Trading added most to NVIDIA in Q1 2026, an estimated $141M increase.
- Simplex Trading's biggest Q1 2026 reduction was Apple, cutting an estimated $174M.
- Simplex Trading fully exited Direxion Daily Semiconductor Bull 3X ETF in Q1 2026, selling an estimated $52M.
- Simplex Trading's ten largest holdings make up 51% of its $149B portfolio in Q1 2026.
- Simplex Trading opened 2,156 new positions and closed 1,574 in Q1 2026.
- Simplex Trading's portfolio value fell 16% quarter-over-quarter to $149B.
Based on Simplex Trading's 13F filing for Q1 2026, filed 14 May 2026.