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 | |
|---|---|---|---|---|---|---|
4176
PUT
CubeSmart
CUBE
$9.62B
| $315K | ﹤0.01% |
6,800
-128,400
| -95% | -$5.05M |
|
4177
Granite Construction
GVA
$5.31B
| $315K | ﹤0.01% |
+6,201
| New | +$270K |
|
4178
CALL
Bioceres Crop Solutions
BIOX
$20.6M
| $314K | ﹤0.01% |
22,900
+22,800
| +22,800% | +$267K |
|
|
PPLI
4179
People Inc
PPLI
$3.13B
| $314K | ﹤0.01% |
+7,319
| New | +$287K |
|
4180
CALL
Vicor
VICR
$8.76B
| $314K | ﹤0.01% |
7,000
-200
| -3% | -$8.81K |
|
4181
Appian
APPN
$2.01B
| $313K | ﹤0.01% |
8,325
+6,233
| +298% | +$244K |
|
4182
PUT
Collegium Pharmaceutical
COLL
$1.16B
| $313K | ﹤0.01% |
10,200
+100
| +1% | +$2.5K |
|
4183
National Vision
EYE
$1.75B
| $313K | ﹤0.01% |
14,958
+14,675
| +5,186% | +$260K |
|
4184
PUT
Sanmina
SANM
$9.24B
| $313K | ﹤0.01% |
6,100
+5,000
| +455% | +$255K |
|
4185
CALL
Tenable Holdings
TENB
$3.46B
| $313K | ﹤0.01% |
6,800
-2,100
| -24% | -$88.3K |
|
4186
Barclays
BCS
$91B
| $312K | ﹤0.01% |
+39,619
| New | +$285K |
|
4187
PUT
Dine Brands
DIN
$458M
| $312K | ﹤0.01% |
6,300
+3,100
| +97% | +$147K |
|
4188
Globalstar
GSAT
$10.2B
| $312K | ﹤0.01% |
10,743
-3,351
| -24% | -$73.7K |
|
4189
Kodak
KODK
$812M
| $312K | ﹤0.01% |
+80,227
| New | +$309K |
|
4190
NextNav
NN
$1.84B
| $312K | ﹤0.01% |
70,316
+59,032
| +523% | +$267K |
|
4191
CALL
Pegasystems
PEGA
$4.85B
| $312K | ﹤0.01% |
12,800
+12,600
| +6,300% | +$295K |
|
4192
CALL
LifeMD
LFMD
$186M
| $311K | ﹤0.01% |
37,600
+25,100
| +201% | +$180K |
|
4193
CALL
Alta Equipment Group
ALTG
$207M
| $310K | ﹤0.01% |
+25,100
| New | +$271K |
|
4194
PUT
MannKind Corp
MNKD
$1.21B
| $310K | ﹤0.01% |
85,200
-25,300
| -23% | -$96.6K |
|
4195
CALL
ABM Industries
ABM
$2.88B
| $309K | ﹤0.01% |
6,900
+5,800
| +527% | +$245K |
|
4196
CALL
Broadstone Net Lease
BNL
$4.3B
| $309K | ﹤0.01% |
18,000
-7,100
| -28% | -$110K |
|
4197
Extreme Networks
EXTR
$3.92B
| $309K | ﹤0.01% |
+17,548
| New | +$332K |
|
4198
Icon
ICLR
$13.9B
| $309K | ﹤0.01% |
1,092
+493
| +82% | +$128K |
|
4199
CALL
Pulmonx
LUNG
$52.8M
| $309K | ﹤0.01% |
24,300
-21,500
| -47% | -$224K |
|
|
TGH
4200
DELISTED
Textainer Group Holdings limited
TGH
| $309K | ﹤0.01% |
+6,283
| New | +$289K |
|
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.