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 | |
|---|---|---|---|---|---|---|
5201
CALL
AMN Healthcare
AMN
$1.3B
| $119K | ﹤0.01% |
1,600
-2,200
| -58% | -$157K |
|
5202
American Outdoor Brands
AOUT
$155M
| $119K | ﹤0.01% |
14,251
+14,194
| +24,902% | +$122K |
|
5203
CALL
Biohaven
BHVN
$2.03B
| $119K | ﹤0.01% |
2,800
-4,000
| -59% | -$124K |
|
5204
Direxion Daily Gold Miners Index Bear 2X ETF
DUST
$70.6M
| $119K | ﹤0.01% |
117
-437
| -79% | -$535K |
|
5205
PUT
FTI Consulting
FCN
$4.4B
| $119K | ﹤0.01% |
+600
| New | +$124K |
|
5206
CALL
GoPro
GPRO
$130M
| $119K | ﹤0.01% |
34,300
-100
| -0.3% | -$317 |
|
5207
Goosehead Insurance
GSHD
$2.2B
| $119K | ﹤0.01% |
+1,583
| New | +$114K |
|
5208
PUT
Garrett Motion
GTX
$5.81B
| $119K | ﹤0.01% |
12,400
-28,200
| -69% | -$218K |
|
5209
Knife River
KNF
$4.15B
| $119K | ﹤0.01% |
1,800
+244
| +16% | +$13.9K |
|
5210
CALL
Quad
QUAD
$536M
| $119K | ﹤0.01% |
22,100
-12,700
| -36% | -$62K |
|
5211
State Street SPDR Portfolio S&P 500 Value ETF
SPYV
$36.1B
| $119K | ﹤0.01% |
+2,565
| New | +$111K |
|
|
SWTX
5212
DELISTED
SpringWorks Therapeutics
SWTX
| $119K | ﹤0.01% |
3,261
+2,794
| +598% | +$72.9K |
|
5213
PUT
Trinity Industries
TRN
$2.48B
| $119K | ﹤0.01% |
+4,500
| New | +$108K |
|
5214
Ameresco
AMRC
$1.12B
| $118K | ﹤0.01% |
3,733
-473
| -11% | -$14.3K |
|
|
CMPS
5215
CALL
Compass Pathways
CMPS
$1.53B
| $118K | ﹤0.01% |
13,500
+7,300
| +118% | +$47.2K |
|
5216
PUT
Americold
COLD
$4.02B
| $118K | ﹤0.01% |
+3,900
| New | +$109K |
|
5217
PUT
8x8 Inc
EGHT
$269M
| $118K | ﹤0.01% |
31,400
+21,200
| +208% | +$62.9K |
|
|
PDS
5218
Precision Drilling
PDS
$999M
| $118K | ﹤0.01% |
+2,187
| New | +$126K |
|
5219
CALL
Phathom Pharmaceuticals
PHAT
$708M
| $118K | ﹤0.01% |
13,000
-33,100
| -72% | -$285K |
|
5220
CALL
Tactile Systems Technology
TCMD
$635M
| $118K | ﹤0.01% |
8,300
-42,500
| -84% | -$534K |
|
|
FFAI
5221
CALL
Faraday Future Intelligent Electric
FFAI
$15.2M
| $118K | ﹤0.01% |
29
-13
| -31% | -$174K |
|
5222
PUT
Assurant
AIZ
$13.8B
| $117K | ﹤0.01% |
700
-1,000
| -59% | -$159K |
|
5223
ALX Oncology
ALXO
$261M
| $117K | ﹤0.01% |
7,880
-1,580
| -17% | -$15K |
|
5224
Arista Networks
ANET
$227B
| $117K | ﹤0.01% |
+1,992
| New | +$105K |
|
5225
CALL
Clarus
CLAR
$123M
| $117K | ﹤0.01% |
17,000
+6,400
| +60% | +$37.6K |
|
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.