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 | |
|---|---|---|---|---|---|---|
|
MRO
1951
DELISTED
Marathon Oil Corporation
MRO
| $3.16M | ﹤0.01% |
+130,864
| New | +$3.37M |
|
|
WW
1952
PUT
DELISTED
WW International
WW
| $3.16M | ﹤0.01% |
361,200
+203,000
| +128% | +$1.72M |
|
1953
PUT
Sabre
SABR
$656M
| $3.16M | ﹤0.01% |
718,100
+471,300
| +191% | +$1.82M |
|
1954
PUT
QuantumScape Corp
QS
$3B
| $3.15M | ﹤0.01% |
453,500
-707,900
| -61% | -$4.46M |
|
1955
CALL
Snap-on
SNA
$20.9B
| $3.15M | ﹤0.01% |
10,900
+9,600
| +738% | +$2.59M |
|
1956
PUT
WisdomTree US Total Dividend Fund
DTD
$1.65B
| $3.15M | ﹤0.01% |
36,900
-18,200
| -33% | -$1.12M |
|
|
VSTO
1957
CALL
DELISTED
Vista Outdoor Inc.
VSTO
| $3.14M | ﹤0.01% |
106,300
+82,600
| +349% | +$2.27M |
|
1958
PUT
Concentrix
CNXC
$1.36B
| $3.14M | ﹤0.01% |
32,000
+28,300
| +765% | +$2.47M |
|
1959
PUT
Nutanix
NTNX
$14.9B
| $3.14M | ﹤0.01% |
65,900
+19,600
| +42% | +$793K |
|
1960
Boston Properties
BXP
$11B
| $3.14M | ﹤0.01% |
+44,745
| New | +$2.64M |
|
1961
CALL
Casey's General Stores
CASY
$31.9B
| $3.13M | ﹤0.01% |
11,400
+3,400
| +43% | +$930K |
|
1962
PUT
F5
FFIV
$22.1B
| $3.13M | ﹤0.01% |
17,500
-2,600
| -13% | -$424K |
|
|
CFLT
1963
PUT
DELISTED
Confluent
CFLT
| $3.13M | ﹤0.01% |
133,800
+7,000
| +6% | +$169K |
|
|
CNH
1964
PUT
CNH Industrial
CNH
$13.8B
| $3.13M | ﹤0.01% |
256,900
+254,200
| +9,415% | +$2.84M |
|
1965
CALL
Canadian Solar
CSIQ
$906M
| $3.13M | ﹤0.01% |
119,200
-47,400
| -28% | -$1.05M |
|
1966
PUT
Build-A-Bear
BBW
$423M
| $3.12M | ﹤0.01% |
137,800
-78,400
| -36% | -$1.98M |
|
1967
Cigna
CI
$76.6B
| $3.12M | ﹤0.01% |
10,418
+3,522
| +51% | +$1.03M |
|
|
KEEL
1968
CALL
Keel Infrastructure Corp
KEEL
$2.57B
| $3.12M | ﹤0.01% |
1,071,600
+35,500
| +3% | +$57K |
|
1969
CALL
Edison International
EIX
$30.7B
| $3.12M | ﹤0.01% |
43,600
-9,700
| -18% | -$637K |
|
1970
Invesco CurrencyShares Japanese Yen Trust
FXY
$423M
| $3.12M | ﹤0.01% |
47,360
-42,881
| -48% | -$2.69M |
|
1971
PUT
Canadian National Railway
CNI
$78.3B
| $3.12M | ﹤0.01% |
24,800
+8,500
| +52% | +$963K |
|
1972
Sherwin-Williams
SHW
$78.3B
| $3.11M | ﹤0.01% |
+9,987
| New | +$2.69M |
|
1973
Agnico Eagle Mines
AEM
$72.6B
| $3.11M | ﹤0.01% |
56,734
-107,112
| -65% | -$5.35M |
|
1974
CALL
Power Integrations
POWI
$3.54B
| $3.11M | ﹤0.01% |
37,900
+34,500
| +1,015% | +$2.64M |
|
1975
CALL
Syndax Pharmaceuticals
SNDX
$1.84B
| $3.11M | ﹤0.01% |
143,900
-55,000
| -28% | -$845K |
|
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.