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 | |
|---|---|---|---|---|---|---|
|
NSLR
3626
PUT
Neostellar Capital Corp
NSLR
$269M
| $403K | ﹤0.01% |
81,100
-221,700
| -73% | -$1.29M |
|
3627
First Trust Dow Jones Internet Index Fund ETF
FDN
$5B
| $402K | ﹤0.01% |
+1,810
| New | +$446K |
|
3628
Gentex
GNTX
$5.12B
| $402K | ﹤0.01% |
+17,292
| New | +$442K |
|
3629
CALL
Rhythm Pharmaceuticals
RYTM
$7.41B
| $402K | ﹤0.01% |
7,600
+4,400
| +138% | +$244K |
|
3630
PUT
Bausch + Lomb
BLCO
$5.92B
| $401K | ﹤0.01% |
27,700
-39,600
| -59% | -$651K |
|
3631
CALL
Main Street Capital
MAIN
$5.14B
| $401K | ﹤0.01% |
7,100
-4,700
| -40% | -$279K |
|
3632
CALL
Banco Macro
BMA
$5.81B
| $400K | ﹤0.01% |
5,300
-400
| -7% | -$37.4K |
|
3633
Gaotu Techedu
GOTU
$384M
| $400K | ﹤0.01% |
123,139
+90,512
| +277% | +$250K |
|
3634
CALL
Tecnoglass
TGLS
$2.09B
| $400K | ﹤0.01% |
5,600
+100
| +2% | +$7.43K |
|
3635
PUT
Trex
TREX
$4.57B
| $400K | ﹤0.01% |
6,900
+5,900
| +590% | +$383K |
|
3636
Sunrun
RUN
$2.3B
| $398K | ﹤0.01% |
68,059
-208,392
| -75% | -$1.72M |
|
3637
Burford Capital
BUR
$955M
| $397K | ﹤0.01% |
30,061
+14,523
| +93% | +$204K |
|
3638
CALL
Dycom Industries
DY
$12.1B
| $396K | ﹤0.01% |
2,600
-5,100
| -66% | -$879K |
|
3639
CALL
Liberty Media Series A
FWONA
$23.3B
| $396K | ﹤0.01% |
4,400
-400
| -8% | -$34K |
|
3640
Jefferies Financial Group
JEF
$13.2B
| $396K | ﹤0.01% |
7,395
+998
| +16% | +$67.7K |
|
3641
CALL
Medpace
MEDP
$15.9B
| $396K | ﹤0.01% |
1,300
-2,900
| -69% | -$975K |
|
3642
CALL
SoundThinking
SSTI
$110M
| $396K | ﹤0.01% |
23,400
+23,300
| +23,300% | +$345K |
|
3643
TORM
TRMD
$3.05B
| $396K | ﹤0.01% |
24,075
+11,408
| +90% | +$221K |
|
3644
CALL
Community Health Systems
CYH
$393M
| $395K | ﹤0.01% |
146,300
+52,000
| +55% | +$162K |
|
3645
FS KKR Capital
FSK
$3.08B
| $395K | ﹤0.01% |
18,884
+331
| +2% | +$7.4K |
|
3646
PUT
Synaptics
SYNA
$4.33B
| $395K | ﹤0.01% |
6,200
+5,800
| +1,450% | +$420K |
|
3647
CALL
Visteon
VC
$2.85B
| $395K | ﹤0.01% |
5,100
+4,400
| +629% | +$370K |
|
3648
PUT
Allegro MicroSystems
ALGM
$8.29B
| $394K | ﹤0.01% |
15,700
+10,200
| +185% | +$255K |
|
3649
PUT
Cerence
CRNC
$368M
| $394K | ﹤0.01% |
49,900
-128,200
| -72% | -$1.58M |
|
3650
PUT
Evolv Technologies
EVLV
$1.01B
| $394K | ﹤0.01% |
126,600
-330,300
| -72% | -$1.16M |
|
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.