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 | |
|---|---|---|---|---|---|---|
4251
CALL
Vaxcyte
PCVX
$7.71B
| $295K | ﹤0.01% |
4,700
+4,300
| +1,075% | +$223K |
|
4252
Alcon
ALC
$34B
| $294K | ﹤0.01% |
+3,774
| New | +$279K |
|
4253
Trump Media & Technology Group
DJT
$2.69B
| $294K | ﹤0.01% |
16,838
-7,821
| -32% | -$128K |
|
4254
iShares MSCI Global Min Vol Factor ETF
ACWV
$3.34B
| $293K | ﹤0.01% |
+2,928
| New | +$284K |
|
4255
CALL
Liberty Energy
LBRT
$2.82B
| $293K | ﹤0.01% |
16,200
-6,200
| -28% | -$118K |
|
4256
CALL
ReNew
RNW
$2.21B
| $292K | ﹤0.01% |
38,200
+32,900
| +621% | +$203K |
|
|
IDEX
4257
CALL
DELISTED
Ideanomics, Inc. Common Stock
IDEX
| $292K | ﹤0.01% |
146,800
-16,100
| -10% | -$33.2K |
|
4258
PUT
Healthpeak Properties
DOC
$15.7B
| $291K | ﹤0.01% |
14,700
-277,900
| -95% | -$4.89M |
|
4259
CALL
Element Solutions
ESI
$8.4B
| $291K | ﹤0.01% |
12,600
-4,300
| -25% | -$86.8K |
|
|
MRUS
4260
PUT
DELISTED
Merus
MRUS
| $291K | ﹤0.01% |
10,600
+10,500
| +10,500% | +$245K |
|
4261
M&T Bank
MTB
$36.5B
| $291K | ﹤0.01% |
+2,126
| New | +$267K |
|
4262
CALL
NGL Energy Partners
NGL
$1.89B
| $291K | ﹤0.01% |
52,300
+46,100
| +744% | +$200K |
|
4263
PUT
Polestar Automotive Holding UK
PSNY
$1.9B
| $291K | ﹤0.01% |
4,293
+823
| +24% | +$57.3K |
|
4264
PUT
Carpenter Technology
CRS
$26.4B
| $290K | ﹤0.01% |
4,100
-7,300
| -64% | -$491K |
|
4265
PUT
Onto Innovation
ONTO
$10.9B
| $290K | ﹤0.01% |
1,900
-200
| -10% | -$26.9K |
|
4266
PUT
PDS Biotechnology
PDSB
$36.9M
| $290K | ﹤0.01% |
58,400
+22,000
| +60% | +$109K |
|
4267
PUT
PRA Group
PRAA
$681M
| $290K | ﹤0.01% |
11,100
+4,400
| +66% | +$82.3K |
|
4268
CALL
Heritage Insurance Holdings
HRTG
$902M
| $289K | ﹤0.01% |
44,400
+29,400
| +196% | +$203K |
|
4269
Silicon Laboratories
SLAB
$7.17B
| $289K | ﹤0.01% |
2,188
-60
| -3% | -$6.56K |
|
4270
SunCoke Energy
SXC
$748M
| $289K | ﹤0.01% |
+26,972
| New | +$257K |
|
4271
PUT
Tandem Diabetes Care
TNDM
$1.24B
| $289K | ﹤0.01% |
9,800
-700
| -7% | -$14.5K |
|
4272
PUT
Kimbell Royalty Partners
KRP
$1.46B
| $288K | ﹤0.01% |
19,200
-62,900
| -77% | -$985K |
|
4273
CALL
Runway Growth Finance
RWAY
$236M
| $287K | ﹤0.01% |
22,800
-4,700
| -17% | -$58.8K |
|
4274
A.O. Smith
AOS
$8.55B
| $286K | ﹤0.01% |
+3,473
| New | +$256K |
|
|
INFA
4275
CALL
DELISTED
Informatica
INFA
| $286K | ﹤0.01% |
10,100
-30,400
| -75% | -$731K |
|
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.