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 | |
|---|---|---|---|---|---|---|
5951
PUT
Community Trust Bancorp
CTBI
$1.42B
| $57K | ﹤0.01% |
+1,300
| New | +$51.3K |
|
5952
Delcath Systems
DCTH
$416M
| $57K | ﹤0.01% |
13,814
+12,403
| +879% | +$40.6K |
|
5953
CALL
Eagle Bancorp
EGBN
$838M
| $57K | ﹤0.01% |
1,900
-6,500
| -77% | -$153K |
|
|
ETNB
5954
DELISTED
89bio
ETNB
| $57K | ﹤0.01% |
5,133
-97,542
| -95% | -$897K |
|
5955
Fox Factory Holding Corp
FOXF
$747M
| $57K | ﹤0.01% |
+855
| New | +$62.4K |
|
5956
PUT
Glacier Bancorp
GBCI
$6.38B
| $57K | ﹤0.01% |
1,400
+1,100
| +367% | +$37.4K |
|
5957
PUT
Ituran Location and Control
ITRN
$1.1B
| $57K | ﹤0.01% |
2,100
+2,000
| +2,000% | +$52.9K |
|
|
MODV
5958
PUT
DELISTED
ModivCare
MODV
| $57K | ﹤0.01% |
1,300
+200
| +18% | +$7.89K |
|
5959
Douglas Dynamics
PLOW
$991M
| $57K | ﹤0.01% |
+1,953
| New | +$56.1K |
|
5960
CALL
Rockwell Medical
RMTI
$28M
| $57K | ﹤0.01% |
3,030
+2,290
| +309% | +$43K |
|
5961
PUT
Sinclair Inc
SBGI
$994M
| $57K | ﹤0.01% |
4,400
-276,800
| -98% | -$3.4M |
|
5962
CALL
Sportsman's Warehouse
SPWH
$45.3M
| $57K | ﹤0.01% |
13,600
+10,600
| +353% | +$50.3K |
|
5963
PUT
W&T Offshore
WTI
$515M
| $57K | ﹤0.01% |
17,600
-300
| -2% | -$1.11K |
|
5964
PUT
York Water
YORW
$501M
| $57K | ﹤0.01% |
+1,500
| New | +$56.5K |
|
|
CHS
5965
CALL
DELISTED
Chicos FAS, Inc.
CHS
| $57K | ﹤0.01% |
79,800
-33,900
| -30% | -$255K |
|
|
RAD
5966
CALL
DELISTED
Rite Aid Corporation
RAD
| $57K | ﹤0.01% |
261,600
-129,800
| -33% | -$81K |
|
5967
Artivion
AORT
$1.34B
| $56K | ﹤0.01% |
+3,182
| New | +$49.5K |
|
5968
Archrock
AROC
$6.21B
| $56K | ﹤0.01% |
3,638
-4,606
| -56% | -$64K |
|
|
DCH
5969
PUT
Dauch Corp
DCH
$1.39B
| $56K | ﹤0.01% |
6,400
+5,000
| +357% | +$37K |
|
|
BPT
5970
CALL
DELISTED
BP Prudhoe Bay Royalty Trust
BPT
| $56K | ﹤0.01% |
22,800
+6,800
| +43% | +$27.6K |
|
5971
CALL
Expensify
EXFY
$178M
| $56K | ﹤0.01% |
23,000
-27,100
| -54% | -$70.2K |
|
5972
Monte Rosa Therapeutics
GLUE
$1.92B
| $56K | ﹤0.01% |
10,043
-16,202
| -62% | -$63.6K |
|
5973
Humacyte
HUMA
$181M
| $56K | ﹤0.01% |
19,993
+9,752
| +95% | +$25K |
|
5974
NovaGold Resources
NG
$2.66B
| $56K | ﹤0.01% |
15,238
+11,920
| +359% | +$44.7K |
|
5975
Nano X Imaging
NNOX
$67.2M
| $56K | ﹤0.01% |
8,873
-6,188
| -41% | -$38.6K |
|
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.