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 | |
|---|---|---|---|---|---|---|
|
MAPS
5226
CALL
DELISTED
WM TECHNOLOGY INC A
MAPS
| $117K | ﹤0.01% |
163,400
| – | – |
|
5227
Nkarta
NKTX
$150M
| $117K | ﹤0.01% |
17,877
+6,602
| +59% | +$17.1K |
|
5228
PUT
Qualys
QLYS
$5.1B
| $117K | ﹤0.01% |
+600
| New | +$105K |
|
5229
PUT
Alpha Architect US Quantitative Value ETF
QVAL
$584M
| $117K | ﹤0.01% |
5,600
-100
| -2% | -$3.74K |
|
5230
Rio Tinto
RIO
$158B
| $117K | ﹤0.01% |
1,580
-61,221
| -97% | -$4.11M |
|
5231
CALL
Compass Diversified
CODI
$758M
| $116K | ﹤0.01% |
5,200
-3,500
| -40% | -$68.6K |
|
5232
Douglas Emmett
DEI
$1.98B
| $116K | ﹤0.01% |
8,027
-4,752
| -37% | -$60.3K |
|
|
OTLY
5233
CALL
Oatly Group
OTLY
$465M
| $116K | ﹤0.01% |
4,940
+1,310
| +36% | +$21.6K |
|
5234
PUT
ARS Pharmaceuticals
SPRY
$509M
| $116K | ﹤0.01% |
21,300
-211,100
| -91% | -$925K |
|
5235
Accel Entertainment
ACEL
$978M
| $115K | ﹤0.01% |
11,269
-30,170
| -73% | -$311K |
|
5236
CALL
4D Molecular Therapeutics
FDMT
$532M
| $115K | ﹤0.01% |
5,700
+5,600
| +5,600% | +$73.7K |
|
5237
Renaissance IPO ETF
IPO
$153M
| $115K | ﹤0.01% |
+3,053
| New | +$101K |
|
5238
CALL
National Fuel Gas
NFG
$7.82B
| $115K | ﹤0.01% |
2,300
-1,300
| -36% | -$67.1K |
|
5239
Perimeter Solutions
PRM
$4.99B
| $115K | ﹤0.01% |
+25,040
| New | +$96.2K |
|
5240
CALL
Avita Medical
RCEL
$135M
| $115K | ﹤0.01% |
8,400
+700
| +9% | +$8.02K |
|
5241
Strategic Education
STRA
$1.85B
| $115K | ﹤0.01% |
+1,247
| New | +$108K |
|
5242
CALL
Xenon Pharmaceuticals
XENE
$6.06B
| $115K | ﹤0.01% |
2,500
-28,500
| -92% | -$1.01M |
|
|
LICY
5243
CALL
DELISTED
Li-Cycle Holdings Corp.
LICY
| $115K | ﹤0.01% |
24,625
+7,612
| +45% | +$86.4K |
|
5244
PUT
AllianceBernstein
AB
$3.43B
| $114K | ﹤0.01% |
3,700
-700
| -16% | -$20.6K |
|
5245
PUT
American Resources Corp
AREC
$191M
| $114K | ﹤0.01% |
77,100
-51,400
| -40% | -$78.6K |
|
5246
CALL
Bionano Genomics
BNGO
$12.3M
| $114K | ﹤0.01% |
1,007
+335
| +50% | +$35K |
|
5247
CALL
Global Partners
GLP
$1.68B
| $114K | ﹤0.01% |
2,700
-2,200
| -45% | -$75.5K |
|
5248
CALL
Option Care Health
OPCH
$3.45B
| $114K | ﹤0.01% |
3,400
-13,600
| -80% | -$418K |
|
5249
PUT
RadNet
RDNT
$5.02B
| $114K | ﹤0.01% |
3,300
+2,600
| +371% | +$82.1K |
|
5250
CALL
AirSculpt Technologies
AIRS
$339M
| $113K | ﹤0.01% |
15,100
+2,100
| +16% | +$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.