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 | |
|---|---|---|---|---|---|---|
3926
PUT
RUM Group Inc
RUM
$1.66B
| $403K | ﹤0.01% |
89,900
-42,600
| -32% | -$208K |
|
3927
PUT
Dycom Industries
DY
$12.1B
| $402K | ﹤0.01% |
3,500
-2,900
| -45% | -$275K |
|
3928
PUT
Extreme Networks
EXTR
$3.92B
| $402K | ﹤0.01% |
22,800
-19,500
| -46% | -$369K |
|
3929
PUT
Halozyme
HALO
$9.9B
| $402K | ﹤0.01% |
10,900
-7,400
| -40% | -$279K |
|
3930
PUT
Ryder
R
$9.98B
| $402K | ﹤0.01% |
3,500
-1,300
| -27% | -$137K |
|
3931
CALL
EXL Service
EXLS
$4.66B
| $401K | ﹤0.01% |
+13,000
| New | +$368K |
|
3932
ITT
ITT
$17.8B
| $401K | ﹤0.01% |
+3,365
| New | +$354K |
|
3933
Manhattan Associates
MANH
$9.95B
| $401K | ﹤0.01% |
1,866
+250
| +15% | +$52.9K |
|
3934
Wolverine World Wide
WWW
$1.71B
| $401K | ﹤0.01% |
45,149
+21,565
| +91% | +$183K |
|
3935
DocGo
DCGO
$62.4M
| $400K | ﹤0.01% |
+71,671
| New | +$412K |
|
3936
CALL
Pliant Therapeutics
PLRX
$66.3M
| $400K | ﹤0.01% |
22,100
-10,800
| -33% | -$164K |
|
3937
WisdomTree India Earnings Fund ETF
EPI
$2.05B
| $399K | ﹤0.01% |
9,753
+8,161
| +513% | +$309K |
|
3938
CALL
Revolve Group
RVLV
$1.92B
| $399K | ﹤0.01% |
24,100
+13,600
| +130% | +$201K |
|
3939
SandRidge Energy
SD
$485M
| $399K | ﹤0.01% |
29,198
+11,175
| +62% | +$165K |
|
3940
PUT
Visteon
VC
$2.85B
| $399K | ﹤0.01% |
3,200
+2,800
| +700% | +$346K |
|
3941
CenterPoint Energy
CNP
$28.8B
| $398K | ﹤0.01% |
13,960
+8,442
| +153% | +$235K |
|
|
SNBR
3942
CALL
DELISTED
Sleep Number
SNBR
| $398K | ﹤0.01% |
26,900
+10,700
| +66% | +$166K |
|
3943
Albertsons Companies
ACI
$5.67B
| $397K | ﹤0.01% |
+17,272
| New | +$381K |
|
|
3944
CALL
DocGo
DCGO
$62.4M
| $396K | ﹤0.01% |
71,000
-5,700
| -7% | -$32.7K |
|
|
LAZR
3945
PUT
DELISTED
Luminar Technologies
LAZR
| $396K | ﹤0.01% |
7,853
-16,407
| -68% | -$816K |
|
3946
PUT
Accel Entertainment
ACEL
$1.01B
| $395K | ﹤0.01% |
38,500
-17,000
| -31% | -$175K |
|
3947
CALL
Amkor Technology
AMKR
$11.3B
| $395K | ﹤0.01% |
11,900
+200
| +2% | +$5.26K |
|
3948
PUT
Black Stone Minerals
BSM
$3.14B
| $395K | ﹤0.01% |
24,800
+3,900
| +19% | +$67.1K |
|
3949
PUT
Eos Energy Enterprises
EOSE
$1.22B
| $394K | ﹤0.01% |
362,000
+90,000
| +33% | +$131K |
|
3950
YieldMax TSLA Option Income Strategy ETF
TSLY
$624M
| $393K | ﹤0.01% |
+3,295
| New | +$398K |
|
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.