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 | |
|---|---|---|---|---|---|---|
1901
Vanguard FTSE Europe ETF
VGK
$30B
| $3.33M | ﹤0.01% |
51,722
+47,121
| +1,024% | +$2.82M |
|
1902
PUT
Equity Residential
EQR
$25.4B
| $3.33M | ﹤0.01% |
54,500
+7,500
| +16% | +$434K |
|
1903
CALL
Travelers Companies
TRV
$80.8B
| $3.33M | ﹤0.01% |
17,500
-7,600
| -30% | -$1.32M |
|
1904
CALL
Everest Group
EG
$15.2B
| $3.32M | ﹤0.01% |
9,400
-11,300
| -55% | -$4.38M |
|
|
CTLT
1905
PUT
DELISTED
CATALENT, INC.
CTLT
| $3.32M | ﹤0.01% |
73,900
-210,900
| -74% | -$8.53M |
|
1906
Interactive Brokers
IBKR
$40.9B
| $3.32M | ﹤0.01% |
+160,116
| New | +$3.28M |
|
|
FLG
1907
CALL
Flagstar Bank National Association
FLG
$5.77B
| $3.31M | ﹤0.01% |
108,033
-43,134
| -29% | -$1.29M |
|
1908
CALL
Atkore
ATKR
$2.59B
| $3.31M | ﹤0.01% |
20,700
-600
| -3% | -$82.8K |
|
1909
CALL
Fomento Económico Mexicano
FMX
$43.3B
| $3.31M | ﹤0.01% |
25,400
+9,900
| +64% | +$1.18M |
|
1910
CALL
Hawaiian Electric Industries
HE
$2.33B
| $3.31M | ﹤0.01% |
233,000
-246,000
| -51% | -$3.2M |
|
1911
PPG Industries
PPG
$25.9B
| $3.31M | ﹤0.01% |
22,100
+10,860
| +97% | +$1.47M |
|
1912
PUT
BellRing Brands
BRBR
$1.51B
| $3.3M | ﹤0.01% |
59,600
+57,400
| +2,609% | +$2.77M |
|
1913
CALL
LegalZoom.com
LZ
$1.23B
| $3.3M | ﹤0.01% |
292,200
+15,400
| +6% | +$168K |
|
1914
CALL
Hyatt Hotels
H
$17.6B
| $3.3M | ﹤0.01% |
25,300
-11,900
| -32% | -$1.35M |
|
|
HA
1915
PUT
DELISTED
Hawaiian Holdings, Inc.
HA
| $3.3M | ﹤0.01% |
232,200
+166,100
| +251% | +$1.23M |
|
1916
KeyCorp
KEY
$24.3B
| $3.28M | ﹤0.01% |
+228,022
| New | +$2.71M |
|
|
BPMC
1917
PUT
DELISTED
Blueprint Medicines
BPMC
| $3.27M | ﹤0.01% |
35,500
-3,100
| -8% | -$201K |
|
1918
CALL
SiriusXM
SIRI
$10B
| $3.27M | ﹤0.01% |
59,770
-38,430
| -39% | -$1.85M |
|
1919
Direxion Daily Junior Gold Miners Index Bull 2X ETF
JNUG
$351M
| $3.27M | ﹤0.01% |
+96,446
| New | +$2.89M |
|
|
MAXN
1920
CALL
DELISTED
Maxeon Solar Technologies
MAXN
| $3.27M | ﹤0.01% |
4,559
+3,415
| +299% | +$2.23M |
|
1921
CALL
Plexus
PLXS
$6.81B
| $3.27M | ﹤0.01% |
+30,200
| New | +$3.03M |
|
1922
Immunovant
IMVT
$8.09B
| $3.26M | ﹤0.01% |
77,482
-47,730
| -38% | -$1.76M |
|
1923
CALL
Digital Turbine
APPS
$1.02B
| $3.26M | ﹤0.01% |
475,500
+357,200
| +302% | +$1.99M |
|
1924
CALL
Magna International
MGA
$17.9B
| $3.26M | ﹤0.01% |
55,200
-31,200
| -36% | -$1.68M |
|
1925
PUT
Keurig Dr Pepper
KDP
$40.4B
| $3.26M | ﹤0.01% |
97,800
-322,700
| -77% | -$10.1M |
|
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.