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 | |
|---|---|---|---|---|---|---|
5126
CALL
Wyndham Hotels & Resorts
WH
$5.56B
| $128K | ﹤0.01% |
1,600
-300
| -16% | -$22.6K |
|
5127
PUT
WPP
WPP
$4.36B
| $128K | ﹤0.01% |
2,700
+200
| +8% | +$8.96K |
|
|
ME
5128
CALL
DELISTED
23andMe Holding Co
ME
| $128K | ﹤0.01% |
7,040
-260
| -4% | -$4.5K |
|
5129
CALL
Atmos Energy
ATO
$28.9B
| $127K | ﹤0.01% |
1,100
-10,800
| -91% | -$1.21M |
|
5130
PUT
Fulgent Genetics
FLGT
$472M
| $127K | ﹤0.01% |
4,400
+1,700
| +63% | +$45.5K |
|
|
LX
5131
CALL
LexinFintech Holdings
LX
$241M
| $127K | ﹤0.01% |
69,500
+1,100
| +2% | +$2.11K |
|
|
NFGC
5132
New Found Gold
NFGC
$522M
| $127K | ﹤0.01% |
36,299
+19,529
| +116% | +$74K |
|
5133
PUT
Navitas Semiconductor
NVTS
$2.85B
| $127K | ﹤0.01% |
15,800
-21,600
| -58% | -$145K |
|
|
ACH
5134
CALL
Accendra Health
ACH
$237M
| $127K | ﹤0.01% |
6,600
+4,000
| +154% | +$72.4K |
|
5135
CALL
Return Stacked Bonds & Managed Futures ETF
RSBT
$135M
| $127K | ﹤0.01% |
7,000
+6,600
| +1,650% | +$115K |
|
5136
SoundHound AI
SOUN
$2.68B
| $127K | ﹤0.01% |
59,979
-42,517
| -41% | -$84.2K |
|
|
DOC
5137
CALL
DELISTED
PHYSICIANS REALTY TRUST
DOC
| $127K | ﹤0.01% |
9,600
-1,300
| -12% | -$15.4K |
|
5138
CALL
Alamo Group
ALG
$1.94B
| $126K | ﹤0.01% |
600
-2,300
| -79% | -$421K |
|
|
CMPS
5139
PUT
Compass Pathways
CMPS
$1.54B
| $126K | ﹤0.01% |
14,400
-2,000
| -12% | -$12.9K |
|
5140
Kornit Digital
KRNT
$704M
| $126K | ﹤0.01% |
6,613
-32,285
| -83% | -$560K |
|
5141
CALL
Mercury Insurance
MCY
$5.94B
| $126K | ﹤0.01% |
3,400
-2,500
| -42% | -$86.7K |
|
|
SOL
5142
PUT
DELISTED
Emeren Group
SOL
| $126K | ﹤0.01% |
46,400
-2,900
| -6% | -$7.66K |
|
|
WRK
5143
DELISTED
WestRock Company
WRK
| $126K | ﹤0.01% |
3,045
-34,047
| -92% | -$1.31M |
|
|
NSTG
5144
CALL
DELISTED
NanoString Technologies, Inc.
NSTG
| $126K | ﹤0.01% |
169,300
-8,300
| -5% | -$8.77K |
|
|
EBIX
5145
PUT
DELISTED
Ebix Inc
EBIX
| $126K | ﹤0.01% |
121,600
+67,200
| +124% | +$338K |
|
5146
CALL
Clean Energy Fuels
CLNE
$423M
| $125K | ﹤0.01% |
32,700
-72,600
| -69% | -$265K |
|
5147
Gildan
GIL
$10.3B
| $125K | ﹤0.01% |
3,811
+2,756
| +261% | +$89.3K |
|
5148
PUT
Liberty Energy
LBRT
$3.05B
| $125K | ﹤0.01% |
6,900
+1,200
| +21% | +$22.8K |
|
5149
CALL
Photronics
PLAB
$1.78B
| $125K | ﹤0.01% |
4,000
-26,400
| -87% | -$587K |
|
5150
PUT
UFP Industries
UFPI
$4.9B
| $125K | ﹤0.01% |
+1,000
| New | +$108K |
|
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.