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 | |
|---|---|---|---|---|---|---|
6901
PUT
Werner Enterprises
WERN
$2.34B
| $21K | ﹤0.01% |
500
-3,000
| -86% | -$118K |
|
|
ZH
6902
PUT
Zhihu
ZH
$280M
| $21K | ﹤0.01% |
3,767
| – | – |
|
|
INST
6903
PUT
DELISTED
Instructure Holdings, Inc.
INST
| $21K | ﹤0.01% |
800
-3,100
| -79% | -$80.4K |
|
|
TWOU
6904
DELISTED
2U Inc
TWOU
| $21K | ﹤0.01% |
+596
| New | +$29.1K |
|
|
OSG
6905
DELISTED
Overseas Shipholding Group Inc.
OSG
| $21K | ﹤0.01% |
4,029
+3,180
| +375% | +$15.4K |
|
|
HRT
6906
CALL
DELISTED
HireRight Holdings Corporation
HRT
| $21K | ﹤0.01% |
+1,600
| New | +$18.1K |
|
|
ADN
6907
CALL
DELISTED
Advent Technologies
ADN
| $20K | ﹤0.01% |
3,033
+60
| +2% | +$691 |
|
6908
CALL
Aegon
AEG
$13.6B
| $20K | ﹤0.01% |
3,500
+2,000
| +133% | +$10.4K |
|
6909
PUT
Amplitude
AMPL
$1.18B
| $20K | ﹤0.01% |
1,600
+1,200
| +300% | +$13.3K |
|
6910
BlackSky Technology
BKSY
$908M
| $20K | ﹤0.01% |
1,862
+198
| +12% | +$2.01K |
|
6911
Cars.com
CARS
$703M
| $20K | ﹤0.01% |
1,081
-4,515
| -81% | -$81.2K |
|
|
CCRN
6912
CALL
DELISTED
Cross Country Healthcare
CCRN
| $20K | ﹤0.01% |
900
-2,400
| -73% | -$52K |
|
6913
PUT
CareDx
CDNA
$1.85B
| $20K | ﹤0.01% |
1,700
+100
| +6% | +$819 |
|
6914
CALL
Ceco Environmental
CECO
$3.97B
| $20K | ﹤0.01% |
+1,000
| New | +$18.2K |
|
6915
CALL
Celcuity
CELC
$4.02B
| $20K | ﹤0.01% |
+1,400
| New | +$16.9K |
|
6916
CALL
Carriage Services
CSV
$645M
| $20K | ﹤0.01% |
800
-7,800
| -91% | -$184K |
|
6917
PUT
Delcath Systems
DCTH
$404M
| $20K | ﹤0.01% |
4,900
+4,300
| +717% | +$14.1K |
|
6918
Definitive Healthcare
DH
$73.3M
| $20K | ﹤0.01% |
2,098
+2,041
| +3,581% | +$16K |
|
6919
Douglas Elliman
DOUG
$160M
| $20K | ﹤0.01% |
7,048
-6,289
| -47% | -$13.2K |
|
6920
Global X Autonomous & Electric Vehicles ETF
DRIV
$371M
| $20K | ﹤0.01% |
815
-2,356
| -74% | -$54K |
|
|
EFC
6921
PUT
Ellington Financial
EFC
$1.7B
| $20K | ﹤0.01% |
1,600
-3,100
| -66% | -$39.3K |
|
6922
CALL
Eton Pharmaceutcials
ETON
$1.25B
| $20K | ﹤0.01% |
4,700
-6,500
| -58% | -$26.1K |
|
6923
Liberty Media Series A
FWONA
$23.3B
| $20K | ﹤0.01% |
346
-26
| -7% | -$1.53K |
|
6924
PUT
Genesis Energy
GEL
$1.81B
| $20K | ﹤0.01% |
1,800
-25,300
| -93% | -$290K |
|
6925
PUT
Heron Therapeutics
HRTX
$93M
| $20K | ﹤0.01% |
+12,100
| New | +$13.3K |
|
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.