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 | |
|---|---|---|---|---|---|---|
6976
CALL
Aquestive Therapeutics
AQST
$468M
| $18K | ﹤0.01% |
9,200
-6,800
| -43% | -$12K |
|
6977
CALL
Aterian
ATER
$3.91M
| $18K | ﹤0.01% |
4,467
-83
| -2% | -$320 |
|
|
AUTL
6978
CALL
Autolus Therapeutics
AUTL
$389M
| $18K | ﹤0.01% |
2,800
-7,800
| -74% | -$29.7K |
|
6979
Blackbaud
BLKB
$1.59B
| $18K | ﹤0.01% |
217
-141
| -39% | -$10.7K |
|
6980
PUT
Barnes & Noble Education
BNED
$445M
| $18K | ﹤0.01% |
126
-599
| -83% | -$66.6K |
|
|
BRFS
6981
PUT
DELISTED
BRF SA
BRFS
| $18K | ﹤0.01% |
6,600
-13,100
| -66% | -$32.8K |
|
|
DAO
6982
CALL
Youdao
DAO
$1.91B
| $18K | ﹤0.01% |
4,600
+2,300
| +100% | +$9.4K |
|
6983
Digi International
DGII
$2.55B
| $18K | ﹤0.01% |
+710
| New | +$17.6K |
|
6984
PUT
Dole
DOLE
$1.34B
| $18K | ﹤0.01% |
1,500
-21,000
| -93% | -$243K |
|
6985
CALL
Diana Shipping
DSX
$274M
| $18K | ﹤0.01% |
8,300
-1,102
| -12% | -$3.05K |
|
6986
CALL
EastGroup Properties
EGP
$11.3B
| $18K | ﹤0.01% |
100
| – | – |
|
6987
PUT
Embecta
EMBC
$204M
| $18K | ﹤0.01% |
1,000
-600
| -38% | -$9.84K |
|
6988
PUT
Edgewell Personal Care
EPC
$1.28B
| $18K | ﹤0.01% |
+500
| New | +$17.7K |
|
|
FINV
6989
PUT
FinVolution Group
FINV
$1.15B
| $18K | ﹤0.01% |
3,700
| – | – |
|
6990
US Global Investors
GROW
$36.8M
| $18K | ﹤0.01% |
+6,611
| New | +$18.8K |
|
6991
GSI Technology
GSIT
$222M
| $18K | ﹤0.01% |
7,106
-6,552
| -48% | -$16.5K |
|
6992
CALL
Hyster-Yale Materials Handling
HY
$596M
| $18K | ﹤0.01% |
+300
| New | +$14.3K |
|
6993
iShares US Oil Equipment & Services ETF
IEZ
$363M
| $18K | ﹤0.01% |
836
-1,336
| -62% | -$29.9K |
|
|
JAMF
6994
CALL
DELISTED
Jamf
JAMF
| $18K | ﹤0.01% |
1,000
-600
| -38% | -$10.1K |
|
6995
CALL
JELD-WEN Holding
JELD
$99.9M
| $18K | ﹤0.01% |
1,000
-70,000
| -99% | -$1.04M |
|
|
JHG
6996
CALL
DELISTED
Janus Henderson
JHG
| $18K | ﹤0.01% |
600
+100
| +20% | +$2.58K |
|
6997
CALL
Coca-Cola Femsa
KOF
$22.9B
| $18K | ﹤0.01% |
200
+100
| +100% | +$8.33K |
|
6998
Karyopharm Therapeutics
KPTI
$161M
| $18K | ﹤0.01% |
1,400
-34
| -2% | -$458 |
|
6999
CALL
Kura Oncology
KURA
$901M
| $18K | ﹤0.01% |
1,300
| – | – |
|
|
7000
PUT
Kura Oncology
KURA
$901M
| $18K | ﹤0.01% |
1,300
+900
| +225% | +$8.85K |
|
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.