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 | |
|---|---|---|---|---|---|---|
2176
PUT
Barclays
BCS
$94.1B
| $2.52M | ﹤0.01% |
320,200
-79,800
| -20% | -$575K |
|
2177
Direxion Daily Financial Bull 3x ETF
FAS
$2.4B
| $2.52M | ﹤0.01% |
30,508
-8,610
| -22% | -$565K |
|
2178
CALL
Cooper-Standard Automotive
CPS
$504M
| $2.52M | ﹤0.01% |
129,000
+100,300
| +349% | +$1.6M |
|
|
GES
2179
CALL
DELISTED
Guess Inc
GES
| $2.52M | ﹤0.01% |
109,300
+2,200
| +2% | +$49.2K |
|
2180
CALL
Archer Aviation
ACHR
$3.64B
| $2.5M | ﹤0.01% |
406,700
+134,800
| +50% | +$766K |
|
2181
Novartis
NVS
$295B
| $2.49M | ﹤0.01% |
24,703
+15,728
| +175% | +$1.52M |
|
2182
PUT
Cipher Digital
CIFR
$9.47B
| $2.49M | ﹤0.01% |
603,300
+432,800
| +254% | +$1.32M |
|
2183
CALL
ZTO Express
ZTO
$18.2B
| $2.49M | ﹤0.01% |
116,900
+56,200
| +93% | +$1.28M |
|
2184
Ardelyx
ARDX
$1.24B
| $2.48M | ﹤0.01% |
400,679
+245,708
| +159% | +$1.1M |
|
|
FSR
2185
CALL
DELISTED
Fisker Inc.
FSR
| $2.48M | ﹤0.01% |
1,419,800
-437,300
| -24% | -$1.55M |
|
2186
Zoom
ZM
$25.8B
| $2.48M | ﹤0.01% |
34,533
-93,640
| -73% | -$6.19M |
|
|
2187
ZTO Express
ZTO
$18.2B
| $2.48M | ﹤0.01% |
+116,641
| New | +$2.65M |
|
2188
CALL
Brinker International
EAT
$8.02B
| $2.47M | ﹤0.01% |
57,300
+28,900
| +102% | +$1.04M |
|
2189
Roper Technologies
ROP
$36.3B
| $2.47M | ﹤0.01% |
+4,527
| New | +$2.33M |
|
2190
PUT
Twist Bioscience
TWST
$5.62B
| $2.45M | ﹤0.01% |
66,600
+24,000
| +56% | +$555K |
|
2191
CALL
Evolv Technologies
EVLV
$943M
| $2.45M | ﹤0.01% |
519,800
+374,700
| +258% | +$1.6M |
|
2192
CALL
Bit Digital
BTBT
$484M
| $2.45M | ﹤0.01% |
579,300
+359,500
| +164% | +$939K |
|
2193
CALL
Hamilton Lane
HLNE
$3.63B
| $2.45M | ﹤0.01% |
21,600
+13,900
| +181% | +$1.31M |
|
2194
PUT
TFI International
TFII
$12.4B
| $2.45M | ﹤0.01% |
18,000
+9,000
| +100% | +$1.07M |
|
2195
CALL
Cheesecake Factory
CAKE
$4.21B
| $2.44M | ﹤0.01% |
69,700
+15,800
| +29% | +$505K |
|
2196
Fidelity National Financial
FNF
$13.9B
| $2.44M | ﹤0.01% |
+47,803
| New | +$2.08M |
|
2197
CALL
Merit Medical Systems
MMSI
$4.43B
| $2.44M | ﹤0.01% |
32,100
+31,100
| +3,110% | +$2.17M |
|
2198
CALL
Genco Shipping & Trading
GNK
$1.17B
| $2.43M | ﹤0.01% |
146,500
+134,400
| +1,111% | +$1.95M |
|
2199
CALL
Integer Holdings
ITGR
$3.35B
| $2.43M | ﹤0.01% |
24,500
+14,900
| +155% | +$1.28M |
|
2200
PUT
Kornit Digital
KRNT
$706M
| $2.42M | ﹤0.01% |
126,600
+11,000
| +10% | +$191K |
|
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.