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 | |
|---|---|---|---|---|---|---|
2126
CALL
VinFast Auto
VFS
$6.67B
| $2.65M | ﹤0.01% |
316,700
-415,500
| -57% | -$2.85M |
|
2127
PUT
Teladoc Health
TDOC
$1.58B
| $2.65M | ﹤0.01% |
122,900
-44,100
| -26% | -$814K |
|
2128
CALL
Vail Resorts
MTN
$5.19B
| $2.65M | ﹤0.01% |
12,400
-4,800
| -28% | -$1.05M |
|
2129
PUT
Applied Digital
APLD
$7.77B
| $2.64M | ﹤0.01% |
392,200
+92,600
| +31% | +$498K |
|
2130
PUT
Brunswick
BC
$5.19B
| $2.64M | ﹤0.01% |
27,300
+9,200
| +51% | +$731K |
|
2131
CALL
Editas Medicine
EDIT
$399M
| $2.64M | ﹤0.01% |
260,700
+103,200
| +66% | +$906K |
|
2132
CALL
Kimco Realty
KIM
$17.6B
| $2.64M | ﹤0.01% |
123,800
+98,600
| +391% | +$1.86M |
|
2133
PUT
Domo
DOMO
$166M
| $2.64M | ﹤0.01% |
256,300
+34,400
| +16% | +$318K |
|
2134
PUT
Ionis Pharmaceuticals
IONS
$9.35B
| $2.63M | ﹤0.01% |
52,100
+29,400
| +130% | +$1.41M |
|
2135
CALL
Neurocrine Biosciences
NBIX
$17.7B
| $2.63M | ﹤0.01% |
20,000
+600
| +3% | +$69.1K |
|
2136
PUT
MicroSectors FANG+ ETNs due Jan 8 2038
FNGS
$542M
| $2.63M | ﹤0.01% |
69,700
+28,000
| +67% | +$970K |
|
2137
Texas Roadhouse
TXRH
$12.7B
| $2.63M | ﹤0.01% |
21,521
+7,492
| +53% | +$801K |
|
2138
CALL
Itaú Unibanco
ITUB
$91.3B
| $2.63M | ﹤0.01% |
428,727
-82,143
| -16% | -$435K |
|
|
EMBJ
2139
CALL
Embraer S.A. ADS
EMBJ
$11.6B
| $2.63M | ﹤0.01% |
142,300
+50,200
| +55% | +$805K |
|
2140
CALL
Philips
PHG
$25.4B
| $2.62M | ﹤0.01% |
125,657
+22,136
| +21% | +$402K |
|
2141
CALL
Otis Worldwide
OTIS
$27.4B
| $2.62M | ﹤0.01% |
29,300
-11,500
| -28% | -$956K |
|
|
ACLX
2142
CALL
DELISTED
Arcellx
ACLX
| $2.61M | ﹤0.01% |
+47,100
| New | +$2.12M |
|
2143
PUT
Progress Software
PRGS
$1.55B
| $2.61M | ﹤0.01% |
48,100
+44,600
| +1,274% | +$2.36M |
|
2144
PUT
Conagra Brands
CAG
$7.07B
| $2.61M | ﹤0.01% |
91,000
-15,700
| -15% | -$440K |
|
2145
Annaly Capital Management
NLY
$16.9B
| $2.61M | ﹤0.01% |
134,637
+60,912
| +83% | +$1.09M |
|
2146
CALL
Acadia Healthcare
ACHC
$3.17B
| $2.6M | ﹤0.01% |
33,500
+32,900
| +5,483% | +$2.44M |
|
2147
CALL
Tencent Music
TME
$14.5B
| $2.6M | ﹤0.01% |
289,000
+50,300
| +21% | +$389K |
|
2148
CALL
Caleres
CAL
$396M
| $2.6M | ﹤0.01% |
84,700
-300
| -0.4% | -$8.46K |
|
2149
AbbVie
ABBV
$458B
| $2.6M | ﹤0.01% |
16,776
-107,476
| -86% | -$15.7M |
|
2150
PUT
Jacobs Solutions
J
$15.9B
| $2.6M | ﹤0.01% |
24,179
+18,376
| +317% | +$2M |
|
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.