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 | |
|---|---|---|---|---|---|---|
1801
CALL
ArcBest
ARCB
$3.44B
| $3.76M | ﹤0.01% |
31,300
+18,900
| +152% | +$2.09M |
|
1802
Pan American Silver
PAAS
$18.6B
| $3.75M | ﹤0.01% |
229,565
-10,498
| -4% | -$157K |
|
1803
CALL
Northern Oil and Gas
NOG
$2.3B
| $3.75M | ﹤0.01% |
101,100
-7,000
| -6% | -$265K |
|
1804
PUT
Acadia Pharmaceuticals
ACAD
$4.25B
| $3.74M | ﹤0.01% |
119,600
-95,400
| -44% | -$2.28M |
|
1805
PUT
Annaly Capital Management
NLY
$16.9B
| $3.74M | ﹤0.01% |
193,100
-7,400
| -4% | -$132K |
|
1806
CALL
Watsco Inc
WSO
$14.9B
| $3.73M | ﹤0.01% |
8,700
+3,300
| +61% | +$1.28M |
|
1807
CALL
Rockwell Automation
ROK
$51.4B
| $3.73M | ﹤0.01% |
12,000
-2,000
| -14% | -$561K |
|
1808
CALL
United Parks & Resorts
PRKS
$2.11B
| $3.72M | ﹤0.01% |
70,500
+68,600
| +3,611% | +$3.27M |
|
1809
CALL
Brookfield
BN
$102B
| $3.72M | ﹤0.01% |
139,650
+124,200
| +804% | +$2.82M |
|
1810
TG Therapeutics
TGTX
$8.58B
| $3.72M | ﹤0.01% |
217,721
+173,656
| +394% | +$2.02M |
|
1811
CALL
Takeda Pharmaceutical
TAK
$55.1B
| $3.71M | ﹤0.01% |
260,300
+1,300
| +0.5% | +$18.4K |
|
1812
PUT
Lincoln National
LNC
$7.91B
| $3.7M | ﹤0.01% |
137,300
+8,000
| +6% | +$192K |
|
1813
CALL
Novartis
NVS
$295B
| $3.7M | ﹤0.01% |
132,000
-45,200
| -26% | -$4.36M |
|
1814
CleanSpark
CLSK
$3.73B
| $3.7M | ﹤0.01% |
335,214
+128,262
| +62% | +$799K |
|
1815
CALL
Globant
GLOB
$1.35B
| $3.69M | ﹤0.01% |
15,500
+100
| +0.6% | +$20.4K |
|
1816
CALL
Huntington Ingalls Industries
HII
$11.3B
| $3.69M | ﹤0.01% |
14,200
+11,500
| +426% | +$2.68M |
|
1817
CALL
State Street SPDR Portfolio Europe ETF
SPEU
$712M
| $3.68M | ﹤0.01% |
78,600
+10,900
| +16% | +$406K |
|
1818
Scorpio Tankers
STNG
$3.96B
| $3.68M | ﹤0.01% |
60,594
-126,918
| -68% | -$7.15M |
|
1819
PUT
Johnson Controls International
JCI
$87.5B
| $3.68M | ﹤0.01% |
63,900
+14,900
| +30% | +$782K |
|
1820
PUT
H&R Block
HRB
$5.18B
| $3.66M | ﹤0.01% |
75,700
+34,700
| +85% | +$1.55M |
|
|
JNPR
1821
CALL
DELISTED
Juniper Networks
JNPR
| $3.66M | ﹤0.01% |
124,200
+7,200
| +6% | +$198K |
|
1822
PUT
Vulcan Materials
VMC
$36.3B
| $3.65M | ﹤0.01% |
16,100
-13,400
| -45% | -$2.84M |
|
1823
CALL
Patrick Industries
PATK
$2.8B
| $3.65M | ﹤0.01% |
54,600
+53,700
| +5,967% | +$2.95M |
|
1824
CALL
AvalonBay Communities
AVB
$27.1B
| $3.65M | ﹤0.01% |
19,500
-3,900
| -17% | -$680K |
|
1825
PUT
First Trust Consumer Discretionary AlphaDEX Fund
FXD
$263M
| $3.65M | ﹤0.01% |
62,200
+40,300
| +184% | +$2.12M |
|
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.