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 | |
|---|---|---|---|---|---|---|
5176
SkyWater Technology
SKYT
$1.6B
| $122K | ﹤0.01% |
+12,748
| New | +$85.2K |
|
|
SVM
5177
PUT
Silvercorp Metals
SVM
$2.07B
| $122K | ﹤0.01% |
46,400
-300
| -0.6% | -$735 |
|
|
FUSN
5178
CALL
DELISTED
Fusion Pharmaceuticals Inc. Common Shares
FUSN
| $122K | ﹤0.01% |
+12,700
| New | +$61.7K |
|
|
TIO
5179
CALL
DELISTED
Tingo Group, Inc. Common Stock
TIO
| $122K | ﹤0.01% |
177,100
-46,800
| -21% | -$37.7K |
|
5180
American Resources Corp
AREC
$191M
| $121K | ﹤0.01% |
81,300
-57,090
| -41% | -$87.3K |
|
5181
CALL
Ethan Allen Interiors
ETD
$570M
| $121K | ﹤0.01% |
3,800
+3,600
| +1,800% | +$103K |
|
5182
PUT
GDS Holdings
GDS
$6.56B
| $121K | ﹤0.01% |
13,300
-78,100
| -85% | -$789K |
|
5183
CALL
Nkarta
NKTX
$150M
| $121K | ﹤0.01% |
+18,400
| New | +$47.7K |
|
5184
Omnicell
OMCL
$1.61B
| $121K | ﹤0.01% |
+3,241
| New | +$119K |
|
5185
PUT
Qiagen
QGEN
$8.54B
| $121K | ﹤0.01% |
2,641
-2,357
| -47% | -$100K |
|
5186
PUT
Ryman Hospitality Properties
RHP
$8.43B
| $121K | ﹤0.01% |
1,100
+300
| +38% | +$28.6K |
|
5187
Semtech
SMTC
$11B
| $121K | ﹤0.01% |
+5,536
| New | +$103K |
|
5188
Westrock Coffee
WEST
$792M
| $121K | ﹤0.01% |
11,907
-18,955
| -61% | -$170K |
|
5189
PUT
United Parks & Resorts
PRKS
$2.1B
| $121K | ﹤0.01% |
2,300
-100
| -4% | -$4.76K |
|
|
AIRC
5190
PUT
DELISTED
Apartment Income REIT Corp.
AIRC
| $121K | ﹤0.01% |
3,500
+1,200
| +52% | +$37.6K |
|
5191
CALL
Addus HomeCare
ADUS
$2.16B
| $120K | ﹤0.01% |
1,300
-1,300
| -50% | -$113K |
|
|
ATXS
5192
DELISTED
Astria Therapeutics
ATXS
| $120K | ﹤0.01% |
15,680
+14,615
| +1,372% | +$80.8K |
|
5193
Barrett Business Services
BBSI
$959M
| $120K | ﹤0.01% |
+4,156
| New | +$107K |
|
5194
PUT
Bakkt Inc
BKKT
$321M
| $120K | ﹤0.01% |
2,164
+872
| +67% | +$30.2K |
|
|
DRD
5195
DRDGold
DRD
$1.77B
| $120K | ﹤0.01% |
15,144
+6,953
| +85% | +$59.7K |
|
5196
Inspired Entertainment
INSE
$184M
| $120K | ﹤0.01% |
12,229
+9,952
| +437% | +$94K |
|
5197
PUT
Malibu Boats
MBUU
$541M
| $120K | ﹤0.01% |
2,200
+1,100
| +100% | +$52.7K |
|
5198
PUT
OraSure Technologies
OSUR
$279M
| $120K | ﹤0.01% |
14,700
+11,500
| +359% | +$75.4K |
|
|
OLK
5199
CALL
DELISTED
Olink Holding AB (publ) American Depositary Shares
OLK
| $120K | ﹤0.01% |
4,800
+1,800
| +60% | +$42.3K |
|
|
FUSN
5200
DELISTED
Fusion Pharmaceuticals Inc. Common Shares
FUSN
| $120K | ﹤0.01% |
12,501
+12,422
| +15,724% | +$60.4K |
|
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.