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 | |
|---|---|---|---|---|---|---|
3151
PUT
Aurinia Pharmaceuticals
AUPH
$2B
| $625K | ﹤0.01% |
77,800
-107,000
| -58% | -$867K |
|
3152
CALL
Verisk Analytics
VRSK
$27.2B
| $625K | ﹤0.01% |
2,100
+1,000
| +91% | +$288K |
|
3153
CALL
CACI
CACI
$11B
| $623K | ﹤0.01% |
1,700
-500
| -23% | -$191K |
|
3154
PUT
BioCryst Pharmaceuticals
BCRX
$2.49B
| $622K | ﹤0.01% |
83,000
-3,800
| -4% | -$30.7K |
|
|
HES
3155
PUT
DELISTED
Hess
HES
| $622K | ﹤0.01% |
3,900
-26,400
| -87% | -$3.88M |
|
3156
CALL
Harrow
HROW
$1.42B
| $622K | ﹤0.01% |
23,400
-6,000
| -20% | -$180K |
|
3157
Sphere Entertainment
SPHR
$4.92B
| $622K | ﹤0.01% |
19,029
+17,602
| +1,233% | +$715K |
|
3158
Alcoa
AA
$11.7B
| $620K | ﹤0.01% |
20,350
-78,866
| -79% | -$2.76M |
|
3159
PUT
LifeMD
LFMD
$180M
| $620K | ﹤0.01% |
114,100
+113,800
| +37,933% | +$646K |
|
3160
CALL
FormFactor
FORM
$7.54B
| $619K | ﹤0.01% |
21,900
-52,500
| -71% | -$1.93M |
|
3161
CALL
SS&C Technologies
SSNC
$18.3B
| $618K | ﹤0.01% |
7,400
-27,300
| -79% | -$2.26M |
|
3162
Allot
ALLT
$377M
| $617K | ﹤0.01% |
108,147
+18,936
| +21% | +$133K |
|
3163
Lightspeed Commerce
LSPD
$1.35B
| $617K | ﹤0.01% |
70,520
-37,073
| -34% | -$478K |
|
3164
CALL
Telesat
TSAT
$563M
| $617K | ﹤0.01% |
32,800
+23,100
| +238% | +$441K |
|
3165
Blue Bird Corp
BLBD
$2.35B
| $616K | ﹤0.01% |
19,045
+17,795
| +1,424% | +$651K |
|
3166
CALL
Eastern Bankshares
EBC
$5.28B
| $616K | ﹤0.01% |
37,600
+27,600
| +276% | +$481K |
|
3167
PUT
Lennox International
LII
$19B
| $616K | ﹤0.01% |
+1,100
| New | +$666K |
|
|
SUPV
3168
CALL
Grupo Supervielle
SUPV
$849M
| $615K | ﹤0.01% |
47,100
+400
| +0.9% | +$6.09K |
|
3169
Agilon Health
AGL
$1.56B
| $614K | ﹤0.01% |
5,681
+2,712
| +91% | +$236K |
|
3170
PUT
Delek US
DK
$3.93B
| $614K | ﹤0.01% |
40,800
-15,900
| -28% | -$275K |
|
3171
PUT
Perrigo
PRGO
$1.43B
| $614K | ﹤0.01% |
21,900
-55,200
| -72% | -$1.43M |
|
|
PENG
3172
CALL
Penguin Solutions Inc
PENG
$2.64B
| $613K | ﹤0.01% |
35,300
+26,200
| +288% | +$515K |
|
3173
PUT
Green Brick Partners
GRBK
$3.11B
| $612K | ﹤0.01% |
10,500
+7,900
| +304% | +$467K |
|
3174
PUT
Motorola Solutions
MSI
$70.8B
| $612K | ﹤0.01% |
1,400
-24,500
| -95% | -$10.9M |
|
3175
PUT
Citizens
CIA
$245M
| $611K | ﹤0.01% |
134,500
-19,900
| -13% | -$95.9K |
|
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.