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 | |
|---|---|---|---|---|---|---|
2201
PUT
Braze
BRZE
$2.45B
| $1.68M | ﹤0.01% |
46,600
+27,000
| +138% | +$1.09M |
|
2202
PUT
NOV
NOV
$7.45B
| $1.68M | ﹤0.01% |
110,400
+61,000
| +123% | +$913K |
|
|
CNR
2203
CALL
Core Natural Resources Inc
CNR
$4.19B
| $1.68M | ﹤0.01% |
21,800
-12,000
| -36% | -$1.01M |
|
2204
Frontline
FRO
$8.75B
| $1.68M | ﹤0.01% |
112,934
-11,682
| -9% | -$193K |
|
2205
PUT
Labcorp
LH
$24.3B
| $1.68M | ﹤0.01% |
7,200
+5,400
| +300% | +$1.31M |
|
2206
CALL
Plains GP Holdings
PAGP
$5.23B
| $1.67M | ﹤0.01% |
78,400
-99,100
| -56% | -$2.09M |
|
2207
CALL
Ultragenyx Pharmaceutical
RARE
$2.65B
| $1.67M | ﹤0.01% |
46,200
+38,100
| +470% | +$1.59M |
|
2208
PUT
Sarepta Therapeutics
SRPT
$1.66B
| $1.67M | ﹤0.01% |
26,200
-12,800
| -33% | -$1.35M |
|
2209
PUT
Western Midstream Partners
WES
$19.6B
| $1.67M | ﹤0.01% |
40,800
+23,100
| +131% | +$941K |
|
2210
CALL
Xcel Energy
XEL
$51B
| $1.67M | ﹤0.01% |
23,600
+18,900
| +402% | +$1.29M |
|
2211
PUT
B2Gold
BTG
$5.16B
| $1.67M | ﹤0.01% |
585,800
+319,400
| +120% | +$858K |
|
|
KC
2212
CALL
Kingsoft Cloud Holdings
KC
$2.84B
| $1.67M | ﹤0.01% |
116,200
+50,100
| +76% | +$750K |
|
2213
PUT
Royal Gold
RGLD
$17.1B
| $1.67M | ﹤0.01% |
10,200
-35,900
| -78% | -$5.27M |
|
2214
CALL
Zebra Technologies
ZBRA
$12.4B
| $1.67M | ﹤0.01% |
5,900
+4,000
| +211% | +$1.37M |
|
2215
CALL
Eastman Chemical
EMN
$7.8B
| $1.67M | ﹤0.01% |
18,900
+8,900
| +89% | +$840K |
|
2216
CALL
Jack Henry & Associates
JKHY
$10.7B
| $1.66M | ﹤0.01% |
9,100
+8,600
| +1,720% | +$1.5M |
|
2217
PUT
Cytokinetics
CYTK
$11B
| $1.66M | ﹤0.01% |
41,300
-103,600
| -71% | -$4.76M |
|
2218
PUT
First Horizon
FHN
$12.1B
| $1.66M | ﹤0.01% |
85,400
-104,900
| -55% | -$2.16M |
|
|
2219
CALL
B2Gold
BTG
$5.16B
| $1.66M | ﹤0.01% |
581,400
+376,000
| +183% | +$1.01M |
|
|
AKRO
2220
DELISTED
Akero Therapeutics
AKRO
| $1.65M | ﹤0.01% |
40,853
+17,998
| +79% | +$763K |
|
2221
CALL
Silicon Motion
SIMO
$9.19B
| $1.65M | ﹤0.01% |
32,600
-16,300
| -33% | -$882K |
|
|
HES
2222
CALL
DELISTED
Hess
HES
| $1.65M | ﹤0.01% |
10,300
-8,100
| -44% | -$1.19M |
|
2223
Pitney Bowes
PBI
$2.42B
| $1.65M | ﹤0.01% |
+181,818
| New | +$1.65M |
|
2224
CALL
Tetra Tech
TTEK
$8.23B
| $1.64M | ﹤0.01% |
56,200
+50,700
| +922% | +$1.7M |
|
2225
CALL
CubeSmart
CUBE
$9.53B
| $1.64M | ﹤0.01% |
38,400
+38,100
| +12,700% | +$1.59M |
|
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.