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 | |
|---|---|---|---|---|---|---|
6176
CALL
Atossa Therapeutics
ATOS
$23M
| $32K | ﹤0.01% |
3,267
-846
| -21% | -$10.3K |
|
6177
CALL
Collegium Pharmaceutical
COLL
$1.18B
| $32K | ﹤0.01% |
1,100
-5,800
| -84% | -$177K |
|
|
CRGX
6178
CALL
DELISTED
CARGO Therapeutics
CRGX
| $32K | ﹤0.01% |
+8,100
| New | +$54.2K |
|
6179
Eversource Energy
ES
$28.1B
| $32K | ﹤0.01% |
+523
| New | +$31.2K |
|
6180
Direxion Daily FTSE Europe Bull 3x ETF
EURL
$50.9M
| $32K | ﹤0.01% |
+1,206
| New | +$31K |
|
6181
CALL
CapForce IBD 50 ETF
FFTY
$78.8M
| $32K | ﹤0.01% |
+1,200
| New | +$35.2K |
|
6182
CALL
Funko
FNKO
$346M
| $32K | ﹤0.01% |
4,700
+1,200
| +34% | +$13.9K |
|
6183
Cedar Fair
FUN
$1.88B
| $32K | ﹤0.01% |
911
-1,383
| -60% | -$58.8K |
|
|
JNPR
6184
DELISTED
Juniper Networks
JNPR
| $32K | ﹤0.01% |
901
-31,352
| -97% | -$1.15M |
|
6185
Milestone Pharmaceuticals
MIST
$129M
| $32K | ﹤0.01% |
40,636
+35,994
| +775% | +$71.6K |
|
6186
CALL
Nuvectis Pharma
NVCT
$652M
| $32K | ﹤0.01% |
+3,300
| New | +$23.8K |
|
6187
Blue Owl Capital
OBDC
$5.35B
| $32K | ﹤0.01% |
2,219
-49,933
| -96% | -$750K |
|
|
ORGN
6188
PUT
DELISTED
Origin Materials
ORGN
| $32K | ﹤0.01% |
1,630
-23
| -1% | -$632 |
|
6189
PUT
OneSpan
OSPN
$584M
| $32K | ﹤0.01% |
2,100
-11,800
| -85% | -$210K |
|
6190
Prelude Therapeutics
PRLD
$375M
| $32K | ﹤0.01% |
41,846
+23,032
| +122% | +$21.5K |
|
6191
QuickLogic
QUIK
$211M
| $32K | ﹤0.01% |
6,408
-2,834
| -31% | -$21.3K |
|
6192
PUT
Arcus Biosciences
RCUS
$3.33B
| $32K | ﹤0.01% |
4,200
+3,200
| +320% | +$37.1K |
|
6193
Relay Therapeutics
RLAY
$4B
| $32K | ﹤0.01% |
12,521
-34,941
| -74% | -$137K |
|
|
HTO
6194
PUT
H2O America
HTO
$2.67B
| $32K | ﹤0.01% |
600
+500
| +500% | +$25.6K |
|
6195
CALL
Spok Holdings
SPOK
$229M
| $32K | ﹤0.01% |
2,000
-1,900
| -49% | -$30.9K |
|
6196
Gentherm
THRM
$1.32B
| $32K | ﹤0.01% |
+1,198
| New | +$42K |
|
|
UBX
6197
DELISTED
Unity Biotechnology
UBX
| $32K | ﹤0.01% |
+30,908
| New | +$55.8K |
|
6198
UDR
UDR
$12.8B
| $32K | ﹤0.01% |
710
-227
| -24% | -$9.72K |
|
6199
CALL
Wheels Up
UP
$203M
| $32K | ﹤0.01% |
1,620
-1,430
| -47% | -$39.4K |
|
|
WOW
6200
PUT
DELISTED
WideOpenWest
WOW
| $32K | ﹤0.01% |
6,500
-500
| -7% | -$2.3K |
|
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.