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 | |
|---|---|---|---|---|---|---|
4176
iShares International Developed Real Estate ETF
IFGL
$82.8M
| $228K | ﹤0.01% |
11,590
+3,989
| +52% | +$78.7K |
|
4177
Louisiana-Pacific
LPX
$5.14B
| $228K | ﹤0.01% |
2,489
-11,708
| -82% | -$1.22M |
|
4178
Scholar Rock
SRRK
$5.88B
| $228K | ﹤0.01% |
7,112
-25,843
| -78% | -$994K |
|
|
WOW
4179
CALL
DELISTED
WideOpenWest
WOW
| $228K | ﹤0.01% |
46,100
-90,400
| -66% | -$416K |
|
4180
PUT
Omnicell
OMCL
$1.88B
| $227K | ﹤0.01% |
6,500
+6,100
| +1,525% | +$242K |
|
4181
PUT
Vishay Intertechnology
VSH
$4.6B
| $227K | ﹤0.01% |
14,300
+11,800
| +472% | +$202K |
|
4182
Aviat Networks
AVNW
$253M
| $226K | ﹤0.01% |
11,794
+1,426
| +14% | +$28.8K |
|
|
KEEL
4183
Keel Infrastructure Corp
KEEL
$1.92B
| $226K | ﹤0.01% |
+287,616
| New | +$381K |
|
4184
Ezcorp Inc
EZPW
$1.79B
| $226K | ﹤0.01% |
15,408
-8,080
| -34% | -$107K |
|
4185
CALL
Invesco Mortgage Capital
IVR
$759M
| $226K | ﹤0.01% |
28,700
+4,400
| +18% | +$37.1K |
|
4186
PUT
Steven Madden
SHOO
$3.17B
| $226K | ﹤0.01% |
+8,500
| New | +$299K |
|
|
ARR
4187
Armour Residential REIT
ARR
$2.32B
| $224K | ﹤0.01% |
+13,118
| New | +$245K |
|
|
CADE
4188
PUT
DELISTED
Cadence Bank
CADE
| $224K | ﹤0.01% |
+7,400
| New | +$245K |
|
4189
CALL
Cohen & Steers
CNS
$4.2B
| $224K | ﹤0.01% |
2,800
| – | – |
|
4190
PUT
INmune Bio
INMB
$44.9M
| $224K | ﹤0.01% |
28,800
+100
| +0.3% | +$794 |
|
4191
CALL
Phinia Inc
PHIN
$3.04B
| $224K | ﹤0.01% |
5,300
-5,000
| -49% | -$240K |
|
|
TLN
4192
Talen Energy Corp
TLN
$15.1B
| $224K | ﹤0.01% |
+1,122
| New | +$243K |
|
4193
Absci
ABSI
$1.17B
| $223K | ﹤0.01% |
89,128
+83,570
| +1,504% | +$307K |
|
4194
PUT
BellRing Brands
BRBR
$1.55B
| $223K | ﹤0.01% |
3,000
+400
| +15% | +$29.4K |
|
4195
CALL
Element Solutions
ESI
$8.48B
| $223K | ﹤0.01% |
9,900
+7,800
| +371% | +$199K |
|
4196
EVgo
EVGO
$219M
| $223K | ﹤0.01% |
84,110
-106,162
| -56% | -$329K |
|
|
HPP
4197
Hudson Pacific Properties
HPP
$758M
| $223K | ﹤0.01% |
+10,822
| New | +$226K |
|
4198
VanEck Uranium + Nuclear Energy ETF
NLR
$3.67B
| $223K | ﹤0.01% |
3,047
+779
| +34% | +$65.4K |
|
4199
CALL
Primoris Services
PRIM
$4.06B
| $223K | ﹤0.01% |
3,900
-7,800
| -67% | -$564K |
|
4200
PUT
RCI Hospitality Holdings
RICK
$202M
| $223K | ﹤0.01% |
5,200
+4,300
| +478% | +$219K |
|
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.