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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4151
CALL
Xeris Biopharma Holdings
XERS
$1.45B
| $321K | ﹤0.01% |
136,600
-10,200
| -7% | -$18.8K |
|
|
SOVO
4152
CALL
DELISTED
Sovos Brands, Inc. Common Stock
SOVO
| $321K | ﹤0.01% |
14,600
+2,100
| +17% | +$46.2K |
|
4153
CALL
Gevo
GEVO
$348M
| $320K | ﹤0.01% |
276,100
-6,000
| -2% | -$6.85K |
|
4154
CALL
HighPeak Energy
HPK
$836M
| $320K | ﹤0.01% |
22,500
+12,900
| +134% | +$204K |
|
4155
PUT
Mine Safety
MSA
$6.76B
| $320K | ﹤0.01% |
+1,900
| New | +$309K |
|
4156
CALL
uniQure
QURE
$2.75B
| $320K | ﹤0.01% |
47,400
+3,200
| +7% | +$21.1K |
|
4157
CALL
Brunswick
BC
$5.19B
| $319K | ﹤0.01% |
3,300
-1,900
| -37% | -$151K |
|
4158
CALL
Genius Sports
GENI
$1.93B
| $319K | ﹤0.01% |
51,700
-118,700
| -70% | -$639K |
|
4159
OSI Systems
OSIS
$3.57B
| $319K | ﹤0.01% |
2,477
+278
| +13% | +$33.1K |
|
4160
PUT
SFL Corp
SFL
$1.61B
| $319K | ﹤0.01% |
28,300
-7,500
| -21% | -$83.5K |
|
4161
Sixth Street Specialty
TSLX
$1.69B
| $319K | ﹤0.01% |
+14,790
| New | +$304K |
|
4162
CALL
Aurora
AUR
$11.9B
| $318K | ﹤0.01% |
72,900
-71,900
| -50% | -$179K |
|
4163
FirstCash
FCFS
$8.82B
| $318K | ﹤0.01% |
2,942
+1,534
| +109% | +$166K |
|
4164
Rush Street Interactive
RSI
$3.13B
| $318K | ﹤0.01% |
70,825
-128,633
| -64% | -$532K |
|
4165
Sempra
SRE
$58.8B
| $318K | ﹤0.01% |
4,257
-21,191
| -83% | -$1.52M |
|
|
BAND
4166
Bandwidth Inc
BAND
$1.19B
| $317K | ﹤0.01% |
+21,915
| New | +$256K |
|
4167
CALL
Matsons
MATX
$6.04B
| $317K | ﹤0.01% |
2,900
-4,200
| -59% | -$399K |
|
4168
United Therapeutics
UTHR
$25.9B
| $317K | ﹤0.01% |
+1,442
| New | +$332K |
|
4169
PUT
Cactus
WHD
$3.63B
| $317K | ﹤0.01% |
7,000
+6,200
| +775% | +$282K |
|
4170
Asure Software
ASUR
$240M
| $316K | ﹤0.01% |
+33,298
| New | +$278K |
|
4171
PUT
Insmed
INSM
$22.5B
| $316K | ﹤0.01% |
10,200
-33,900
| -77% | -$879K |
|
4172
CALL
Bank of N.T. Butterfield & Son
NTB
$2.42B
| $316K | ﹤0.01% |
9,900
+7,800
| +371% | +$221K |
|
|
PDCO
4173
DELISTED
Patterson Companies, Inc.
PDCO
| $316K | ﹤0.01% |
+11,121
| New | +$327K |
|
|
HIBB
4174
PUT
DELISTED
Hibbett, Inc. Common Stock
HIBB
| $316K | ﹤0.01% |
4,400
-200
| -4% | -$11.2K |
|
4175
CALL
InfraCap MLP ETF
AMZA
$474M
| $315K | ﹤0.01% |
10,900
+2,300
| +27% | +$81.1K |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.