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 |
Walmart Inc
WMT
|
+$43.6M |
| 2 |
Apple
AAPL
|
+$40.9M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$37.7M |
| 4 |
Citigroup
C
|
+$34.2M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$32.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$189M |
| 2 |
Invesco QQQ Trust
QQQ
|
+$123M |
| 3 |
NVIDIA
NVDA
|
+$115M |
| 4 |
Tesla
TSLA
|
+$52M |
| 5 |
Meta Platforms (Facebook)
META
|
+$49M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.42% |
| 2 | Consumer Discretionary | 0.2% |
| 3 | Healthcare | 0.17% |
| 4 | Industrials | 0.15% |
| 5 | Communication Services | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3876
Medifast
MED
$108M
| $289K | ﹤0.01% |
+2,788
| New | +$309K |
|
3877
PUT
ProQR Therapeutics
PRQR
$248M
| $289K | ﹤0.01% |
136,100
+105,400
| +343% | +$322K |
|
3878
CALL
Telos
TLS
$344M
| $289K | ﹤0.01% |
114,400
+200
| +0.2% | +$816 |
|
3879
PUT
Virtu Financial
VIRT
$5.11B
| $289K | ﹤0.01% |
15,300
-116,000
| -88% | -$2.23M |
|
3880
PUT
Vishay Intertechnology
VSH
$5.02B
| $289K | ﹤0.01% |
12,800
+11,200
| +700% | +$246K |
|
3881
PUT
Capital Southwest
CSWC
$1.48B
| $288K | ﹤0.01% |
16,200
+1,600
| +11% | +$29.4K |
|
3882
CALL
Global Partners
GLP
$1.65B
| $288K | ﹤0.01% |
9,300
+5,800
| +166% | +$196K |
|
3883
Adecoagro
AGRO
$1.45B
| $287K | ﹤0.01% |
35,477
+31,671
| +832% | +$255K |
|
3884
American Resources Corp
AREC
$184M
| $287K | ﹤0.01% |
191,738
-19,326
| -9% | -$28.9K |
|
|
AZEK
3885
CALL
DELISTED
The AZEK Co
AZEK
| $287K | ﹤0.01% |
12,200
+7,000
| +135% | +$166K |
|
3886
Bankunited
BKU
$3.41B
| $287K | ﹤0.01% |
12,737
+12,619
| +10,694% | +$411K |
|
3887
CALL
CoreCivic
CXW
$3.03B
| $287K | ﹤0.01% |
31,200
+13,300
| +74% | +$137K |
|
3888
PUT
Douglas Emmett
DEI
$2.01B
| $287K | ﹤0.01% |
23,300
+19,700
| +547% | +$286K |
|
3889
PUT
Fresenius Medical Care
FMS
$13.3B
| $287K | ﹤0.01% |
13,500
-7,400
| -35% | -$142K |
|
|
GRFS
3890
CALL
Grifois
GRFS
$5.44B
| $287K | ﹤0.01% |
39,000
+38,300
| +5,471% | +$332K |
|
3891
CALL
Owens Corning
OC
$11.5B
| $287K | ﹤0.01% |
3,000
-27,700
| -90% | -$2.62M |
|
3892
PUT
Redwire
RDW
$2.05B
| $287K | ﹤0.01% |
95,000
+87,200
| +1,118% | +$257K |
|
|
BLDP
3893
PUT
Ballard Power Systems
BLDP
$808M
| $286K | ﹤0.01% |
51,500
-38,900
| -43% | -$225K |
|
3894
CleanSpark
CLSK
$3.46B
| $286K | ﹤0.01% |
103,094
-18,235
| -15% | -$50K |
|
3895
PUT
Global E Online
GLBE
$6.53B
| $286K | ﹤0.01% |
8,900
-211,100
| -96% | -$5.79M |
|
|
VSTO
3896
DELISTED
Vista Outdoor Inc.
VSTO
| $286K | ﹤0.01% |
+10,327
| New | +$283K |
|
|
FPI
3897
PUT
Farmland Partners
FPI
$417M
| $285K | ﹤0.01% |
26,700
+23,200
| +663% | +$271K |
|
3898
PUT
Ingersoll Rand
IR
$33.9B
| $285K | ﹤0.01% |
4,900
+4,400
| +880% | +$248K |
|
3899
CALL
Leidos
LDOS
$14.9B
| $285K | ﹤0.01% |
3,100
-5,600
| -64% | -$542K |
|
|
SUP
3900
PUT
DELISTED
Superior Industries International
SUP
| $285K | ﹤0.01% |
57,600
| – | – |
|
Similar funds
Simplex Trading's Q1 2023 Portfolio in Review
As of Q1 2023, Simplex Trading held 10,803 positions worth $114B, up 24% from $91.9B the previous quarter. Its ten largest holdings account for 38% of the portfolio.
Simplex Trading deployed $10.1B of net new capital in Q1 2023, opening 1,536 new positions and adding to 3,665 existing holdings. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M.
By sector, the portfolio is most concentrated in Technology at 0.42% of assets, up from 0.35% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Meta Platforms (Facebook), an estimated $49M trimmed.
- Simplex Trading's largest Q1 2023 buy was Walmart Inc: 918,957 shares worth $45.2M.
- Simplex Trading added most to Apple in Q1 2023, an estimated $40.9M increase.
- Simplex Trading's biggest Q1 2023 reduction was Meta Platforms (Facebook), cutting an estimated $49M.
- Simplex Trading fully exited Amazon in Q1 2023, selling an estimated $189M.
- Simplex Trading's ten largest holdings make up 38% of its $114B portfolio in Q1 2023.
- Simplex Trading opened 1,536 new positions and closed 1,729 in Q1 2023.
- Simplex Trading's portfolio value rose 24% quarter-over-quarter to $114B.
Based on Simplex Trading's 13F filing for Q1 2023, filed 27 Apr 2023.