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 | |
|---|---|---|---|---|---|---|
6151
AptarGroup
ATR
$8.69B
| $33K | ﹤0.01% |
224
+216
| +2,700% | +$32.5K |
|
6152
Eledon Pharmaceuticals
ELDN
$255M
| $33K | ﹤0.01% |
9,991
-446
| -4% | -$1.83K |
|
6153
CALL
Equity Lifestyle Properties
ELS
$13.1B
| $33K | ﹤0.01% |
+500
| New | +$33.4K |
|
|
ESGR
6154
CALL
DELISTED
Enstar Group
ESGR
| $33K | ﹤0.01% |
+100
| New | +$33K |
|
|
ESGR
6155
PUT
DELISTED
Enstar Group
ESGR
| $33K | ﹤0.01% |
+100
| New | +$33K |
|
6156
Future Fuel
FF
$205M
| $33K | ﹤0.01% |
8,570
+4,258
| +99% | +$20.5K |
|
6157
Fulgent Genetics
FLGT
$558M
| $33K | ﹤0.01% |
+1,966
| New | +$33.5K |
|
6158
CALL
First Trust US Equity Opportunities ETF
FPX
$1.43B
| $33K | ﹤0.01% |
+300
| New | +$37.3K |
|
6159
PUT
Grocery Outlet
GO
$904M
| $33K | ﹤0.01% |
2,400
-1,100
| -31% | -$16.3K |
|
6160
Ivanhoe Electric
IE
$1.38B
| $33K | ﹤0.01% |
5,775
-3,724
| -39% | -$23.6K |
|
|
NXDR
6161
CALL
Nextdoor Holdings
NXDR
$885M
| $33K | ﹤0.01% |
21,700
-200
| -0.9% | -$447 |
|
6162
CALL
KLX Energy Services
KLXE
$43.1M
| $33K | ﹤0.01% |
9,500
+9,200
| +3,067% | +$44K |
|
6163
PUT
LGI Homes
LGIH
$1.35B
| $33K | ﹤0.01% |
500
-100
| -17% | -$8.08K |
|
6164
CALL
Malibu Boats
MBUU
$548M
| $33K | ﹤0.01% |
1,100
-1,400
| -56% | -$48.3K |
|
6165
Mueller Water Products
MWA
$3.94B
| $33K | ﹤0.01% |
+1,321
| New | +$33.1K |
|
|
OGI
6166
CALL
Organigram Holdings
OGI
$131M
| $33K | ﹤0.01% |
33,600
+9,200
| +38% | +$12.2K |
|
6167
PUT
Olin
OLN
$2.53B
| $33K | ﹤0.01% |
1,400
-6,900
| -83% | -$194K |
|
6168
PUT
Red Robin
RRGB
$139M
| $33K | ﹤0.01% |
9,300
+6,300
| +210% | +$32.3K |
|
|
SRDX
6169
CALL
DELISTED
Surmodics
SRDX
| $33K | ﹤0.01% |
1,100
-1,100
| -50% | -$37K |
|
6170
PUT
10x Genomics
TXG
$5.88B
| $33K | ﹤0.01% |
3,800
-2,500
| -40% | -$31.5K |
|
6171
CALL
Veru
VERU
$35.5M
| $33K | ﹤0.01% |
6,930
+4,450
| +179% | +$27.6K |
|
|
WPRT
6172
Westport Fuel Systems
WPRT
$31.9M
| $33K | ﹤0.01% |
8,936
-228
| -2% | -$935 |
|
|
SMC
6173
CALL
Summit Midstream
SMC
$420M
| $33K | ﹤0.01% |
+1,000
| New | +$40.2K |
|
|
ARTY
6174
iShares Future AI & Tech ETF
ARTY
$3.21B
| $33K | ﹤0.01% |
+1,078
| New | +$40K |
|
6175
PUT
Allogene Therapeutics
ALLO
$625M
| $32K | ﹤0.01% |
22,500
-7,300
| -24% | -$13.8K |
|
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.