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 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$272M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$99M |
| 3 |
NVIDIA
NVDA
|
+$89.9M |
| 4 |
TSMC
TSM
|
+$87.7M |
| 5 |
Amazon
AMZN
|
+$61M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$518M |
| 2 |
Strategy Inc
MSTR
|
+$81.2M |
| 3 |
Alibaba
BABA
|
+$66.7M |
| 4 |
Advanced Micro Devices
AMD
|
+$44.3M |
| 5 |
Uber
UBER
|
+$41.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Consumer Discretionary | 0.22% |
| 3 | Healthcare | 0.17% |
| 4 | Communication Services | 0.15% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2176
CALL
International Flavors & Fragrances
IFF
$19.4B
| $1.73M | ﹤0.01% |
22,300
-99,300
| -82% | -$8.19M |
|
2177
CALL
Ingersoll Rand
IR
$33B
| $1.73M | ﹤0.01% |
21,600
+2,200
| +11% | +$192K |
|
2178
PUT
American Water Works
AWK
$26.3B
| $1.73M | ﹤0.01% |
11,700
-3,600
| -24% | -$474K |
|
2179
CALL
Quest Diagnostics
DGX
$25.1B
| $1.73M | ﹤0.01% |
10,200
+5,700
| +127% | +$936K |
|
2180
PUT
Ingles Markets
IMKTA
$1.63B
| $1.73M | ﹤0.01% |
26,500
-1,000
| -4% | -$63.8K |
|
2181
Invesco S&P 500 Low Volatility ETF
SPLV
$7.2B
| $1.73M | ﹤0.01% |
23,090
+11,664
| +102% | +$842K |
|
2182
CALL
Corebridge Financial
CRBG
$14.1B
| $1.72M | ﹤0.01% |
54,600
+25,800
| +90% | +$835K |
|
2183
PUT
Carpenter Technology
CRS
$30B
| $1.72M | ﹤0.01% |
9,500
-3,500
| -27% | -$675K |
|
2184
Noble Corp
NE
$6.9B
| $1.72M | ﹤0.01% |
72,561
+53,689
| +284% | +$1.54M |
|
|
DQ
2185
PUT
Daqo New Energy
DQ
$790M
| $1.72M | ﹤0.01% |
94,800
-26,200
| -22% | -$513K |
|
2186
PUT
L3Harris
LHX
$55.9B
| $1.72M | ﹤0.01% |
8,200
-12,700
| -61% | -$2.66M |
|
2187
PUT
Telephone and Data Systems
TDS
$3.91B
| $1.72M | ﹤0.01% |
44,300
-47,200
| -52% | -$1.7M |
|
2188
PUT
Birkenstock
BIRK
$7.47B
| $1.71M | ﹤0.01% |
37,400
+24,400
| +188% | +$1.29M |
|
2189
TE Connectivity
TEL
$58.8B
| $1.71M | ﹤0.01% |
+12,115
| New | +$1.79M |
|
2190
Teladoc Health
TDOC
$1.58B
| $1.71M | ﹤0.01% |
214,939
+56,859
| +36% | +$575K |
|
2191
Martin Marietta Materials
MLM
$33.6B
| $1.71M | ﹤0.01% |
3,575
+354
| +11% | +$180K |
|
2192
CALL
Harmony Gold Mining
HMY
$9.92B
| $1.7M | ﹤0.01% |
115,000
+16,600
| +17% | +$185K |
|
|
DENT
2193
CALL
DELISTED
AdvisorShares Dent Tactical ETF
DENT
| $1.7M | ﹤0.01% |
614,600
-1,327,600
| -68% | -$3.67M |
|
2194
PUT
MakeMyTrip
MMYT
$4.67B
| $1.7M | ﹤0.01% |
17,300
+11,800
| +215% | +$1.22M |
|
2195
CALL
Sibanye-Stillwater
SBSW
$5.92B
| $1.69M | ﹤0.01% |
369,900
+108,300
| +41% | +$411K |
|
2196
CALL
Zions Bancorporation
ZION
$10.1B
| $1.69M | ﹤0.01% |
33,900
-62,800
| -65% | -$3.38M |
|
2197
Ardelyx
ARDX
$1.24B
| $1.69M | ﹤0.01% |
343,374
+173,511
| +102% | +$932K |
|
2198
CBRE Group
CBRE
$40.8B
| $1.69M | ﹤0.01% |
+12,891
| New | +$1.75M |
|
2199
Golar LNG
GLNG
$4.95B
| $1.68M | ﹤0.01% |
44,322
-49,575
| -53% | -$1.94M |
|
|
APLS
2200
CALL
DELISTED
Apellis Pharmaceuticals
APLS
| $1.68M | ﹤0.01% |
76,900
-244,800
| -76% | -$6.76M |
|
Similar funds
Simplex Trading's Q1 2025 Portfolio in Review
As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.
- Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
- Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
- Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
- Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
- Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
- Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
- Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.