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 | |
|---|---|---|---|---|---|---|
126
PUT
Oracle
ORCL
$366B
| $135M | 0.09% |
1,280,100
-158,200
| -11% | -$17.3M |
|
127
CALL
Nike
NKE
$63.7B
| $135M | 0.09% |
1,239,800
-359,300
| -22% | -$38.6M |
|
128
CALL
Visa
V
$677B
| $135M | 0.09% |
516,900
-49,800
| -9% | -$12.3M |
|
129
PUT
Procter & Gamble
PG
$345B
| $132M | 0.08% |
899,900
+271,000
| +43% | +$40.1M |
|
130
PUT
Applied Materials
AMAT
$448B
| $131M | 0.08% |
809,200
-29,400
| -4% | -$4.32M |
|
131
PUT
CrowdStrike
CRWD
$195B
| $131M | 0.08% |
2,048,000
+107,200
| +6% | +$5.61M |
|
132
PUT
Mastercard
MA
$476B
| $130M | 0.08% |
305,200
+43,000
| +16% | +$17.3M |
|
133
CALL
Caterpillar
CAT
$410B
| $130M | 0.08% |
439,500
+62,200
| +16% | +$16.1M |
|
134
PUT
McDonald's
MCD
$188B
| $130M | 0.08% |
487,300
+146,200
| +43% | +$39.8M |
|
135
CALL
General Motors
GM
$71.7B
| $127M | 0.08% |
3,544,800
+855,800
| +32% | +$26.5M |
|
136
PUT
Walmart Inc
WMT
$878B
| $127M | 0.08% |
2,415,300
+198,300
| +9% | +$10.5M |
|
137
CALL
Roblox
RBLX
$37.6B
| $127M | 0.08% |
2,771,100
+1,232,300
| +80% | +$45.5M |
|
|
XYZ
138
PUT
Block Inc
XYZ
$47.8B
| $126M | 0.08% |
1,736,900
+362,100
| +26% | +$20.5M |
|
139
CALL
Cisco
CSCO
$442B
| $125M | 0.08% |
2,480,800
+515,100
| +26% | +$26.3M |
|
|
140
CALL
Walmart Inc
WMT
$878B
| $125M | 0.08% |
2,378,700
-256,800
| -10% | -$13.6M |
|
141
PUT
Humana
HUM
$47.8B
| $125M | 0.08% |
273,000
+114,000
| +72% | +$56.2M |
|
142
CALL
United Parcel Service
UPS
$98.9B
| $123M | 0.08% |
783,100
+145,700
| +23% | +$22M |
|
143
CALL
ASML
ASML
$692B
| $123M | 0.08% |
162,100
-22,400
| -12% | -$14.8M |
|
|
KFYP
144
PUT
DELISTED
KraneShares CICC China Leaders 100 Index ETF
KFYP
| $122M | 0.08% |
4,506,800
+2,436,800
| +118% | +$54.5M |
|
145
CALL
FedEx
FDX
$73.1B
| $121M | 0.08% |
476,800
-39,700
| -8% | -$10.1M |
|
146
CALL
IBM
IBM
$198B
| $121M | 0.08% |
740,300
+139,300
| +23% | +$21M |
|
147
CALL
lululemon athletica
LULU
$13.2B
| $120M | 0.08% |
234,700
+148,100
| +171% | +$64M |
|
148
CALL
Booking.com
BKNG
$139B
| $120M | 0.08% |
845,000
+465,000
| +122% | +$58M |
|
149
PUT
Lam Research
LRCX
$403B
| $119M | 0.08% |
1,926,000
+249,000
| +15% | +$17M |
|
150
PUT
Berkshire Hathaway Class B
BRK.B
$1.06T
| $119M | 0.08% |
333,800
-27,100
| -8% | -$9.51M |
|
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.