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 | |
|---|---|---|---|---|---|---|
|
TWOU
7326
CALL
DELISTED
2U Inc
TWOU
| $12K | ﹤0.01% |
330
-233
| -41% | -$11.4K |
|
|
DMTK
7327
PUT
DELISTED
DermTech, Inc. Common Stock
DMTK
| $12K | ﹤0.01% |
6,900
+100
| +1% | +$146 |
|
|
BIOR
7328
CALL
DELISTED
Biora Therapeutics, Inc. Common Stock
BIOR
| $12K | ﹤0.01% |
20,460
+400
| +2% | +$6.48K |
|
7329
PUT
Arbutus Biopharma
ABUS
$865M
| $11K | ﹤0.01% |
4,400
-6,200
| -58% | -$12.1K |
|
7330
PUT
Adtran
ADTN
$798M
| $11K | ﹤0.01% |
1,500
-900
| -38% | -$5.93K |
|
7331
PUT
Akebia Therapeutics
AKBA
$327M
| $11K | ﹤0.01% |
9,300
-6,500
| -41% | -$6.63K |
|
7332
CALL
Alight
ALIT
$497M
| $11K | ﹤0.01% |
65
-950
| -94% | -$140K |
|
7333
PUT
Allison Transmission
ALSN
$10.1B
| $11K | ﹤0.01% |
200
| – | – |
|
7334
PUT
Andersons Inc
ANDE
$2.65B
| $11K | ﹤0.01% |
+200
| New | +$10.4K |
|
7335
American Public Education
APEI
$875M
| $11K | ﹤0.01% |
+1,204
| New | +$7.65K |
|
7336
CALL
Mission Produce
AVO
$1.1B
| $11K | ﹤0.01% |
1,100
+900
| +450% | +$8.36K |
|
7337
PUT
AXIS Capital
AXS
$8.59B
| $11K | ﹤0.01% |
+200
| New | +$11.1K |
|
7338
PUT
BioVie
BIVI
$10.3M
| $11K | ﹤0.01% |
89
-300
| -77% | -$90.1K |
|
7339
CALL
CrossAmerica Partners
CAPL
$830M
| $11K | ﹤0.01% |
500
+100
| +25% | +$2.22K |
|
7340
CALL
CareCloud
CCLD
$94.3M
| $11K | ﹤0.01% |
+7,700
| New | +$8.35K |
|
7341
CALL
CEVA Inc
CEVA
$1.01B
| $11K | ﹤0.01% |
500
-1,500
| -75% | -$30.9K |
|
7342
CALL
Capital Group Growth ETF
CGGR
$23.5B
| $11K | ﹤0.01% |
400
| – | – |
|
7343
PUT
Compass Diversified
CODI
$755M
| $11K | ﹤0.01% |
500
-900
| -64% | -$17.6K |
|
7344
CALL
Civeo
CVEO
$379M
| $11K | ﹤0.01% |
500
+400
| +400% | +$8.65K |
|
7345
CALL
Cushman & Wakefield Ltd
CWK
$2.98B
| $11K | ﹤0.01% |
+1,100
| New | +$9.16K |
|
7346
Donaldson
DCI
$10.8B
| $11K | ﹤0.01% |
+182
| New | +$11.1K |
|
7347
Delek Logistics
DKL
$3.04B
| $11K | ﹤0.01% |
260
+197
| +313% | +$9.06K |
|
|
DRRX
7348
PUT
DELISTED
DURECT Corp
DRRX
| $11K | ﹤0.01% |
19,700
+12,700
| +181% | +$18.1K |
|
7349
CALL
EverQuote
EVER
$886M
| $11K | ﹤0.01% |
+900
| New | +$8.18K |
|
7350
Vertical Aerospace
EVTL
$176M
| $11K | ﹤0.01% |
1,708
+517
| +43% | +$4.57K |
|
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.