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 | |
|---|---|---|---|---|---|---|
|
CGC
3801
Canopy Growth
CGC
$377M
| $339K | ﹤0.01% |
+372,779
| New | +$655K |
|
|
ETWO
3802
CALL
DELISTED
E2open Parent Holdings
ETWO
| $339K | ﹤0.01% |
169,700
-100
| -0.1% | -$248 |
|
3803
PUT
Gen Digital
GEN
$16.6B
| $339K | ﹤0.01% |
12,800
+8,100
| +172% | +$222K |
|
3804
Hormel Foods
HRL
$14.1B
| $339K | ﹤0.01% |
10,980
-17,847
| -62% | -$530K |
|
3805
Medtronic
MDT
$111B
| $339K | ﹤0.01% |
+3,774
| New | +$338K |
|
3806
CALL
Pinnacle Financial Partners Inc
PNFP
$15.9B
| $339K | ﹤0.01% |
3,200
-2,700
| -46% | -$309K |
|
3807
PUT
Virtu Financial
VIRT
$5.11B
| $339K | ﹤0.01% |
8,900
-70,200
| -89% | -$2.61M |
|
3808
Globalstar
GSAT
$10.2B
| $338K | ﹤0.01% |
16,214
-2,576
| -14% | -$62.4K |
|
3809
PUT
St. Joe Company
JOE
$3.57B
| $338K | ﹤0.01% |
7,200
+7,100
| +7,100% | +$332K |
|
|
NOTV
3810
CALL
DELISTED
Inotiv
NOTV
| $338K | ﹤0.01% |
153,100
+38,000
| +33% | +$139K |
|
3811
Amplify Cybersecurity ETF
HACK
$2.65B
| $337K | ﹤0.01% |
4,707
+2,156
| +85% | +$166K |
|
3812
Huazhu Hotels Group
HTHT
$13.2B
| $337K | ﹤0.01% |
9,116
+2,697
| +42% | +$93.4K |
|
3813
CALL
Radian Group
RDN
$5.22B
| $337K | ﹤0.01% |
10,200
+2,800
| +38% | +$91.2K |
|
3814
CALL
Adtran
ADTN
$730M
| $336K | ﹤0.01% |
38,600
+38,300
| +12,767% | +$385K |
|
3815
PUT
Alkermes
ALKS
$8.42B
| $336K | ﹤0.01% |
10,200
+4,700
| +85% | +$153K |
|
3816
CALL
Global Partners
GLP
$1.65B
| $336K | ﹤0.01% |
6,300
+5,100
| +425% | +$276K |
|
3817
CALL
UWM Holdings
UWMC
$631M
| $336K | ﹤0.01% |
61,600
-362,700
| -85% | -$2.2M |
|
3818
Direxion Daily AMZN Bull 2X ETF
AMZU
$268M
| $335K | ﹤0.01% |
11,203
-13,624
| -55% | -$551K |
|
3819
PUT
Donaldson
DCI
$11.1B
| $335K | ﹤0.01% |
+5,000
| New | +$346K |
|
3820
Freshpet
FRPT
$3.01B
| $335K | ﹤0.01% |
4,035
-3,017
| -43% | -$369K |
|
3821
PUT
Medpace
MEDP
$15.9B
| $335K | ﹤0.01% |
1,100
+100
| +10% | +$33.6K |
|
|
MESO
3822
CALL
Mesoblast
MESO
$1.87B
| $335K | ﹤0.01% |
26,900
-68,400
| -72% | -$1.13M |
|
3823
PUT
Mueller Industries
MLI
$14.7B
| $335K | ﹤0.01% |
8,800
-5,800
| -40% | -$232K |
|
3824
CALL
Trupanion
TRUP
$1.11B
| $335K | ﹤0.01% |
9,000
-64,500
| -88% | -$2.68M |
|
3825
PUT
Wave Life Sciences
WVE
$1.13B
| $335K | ﹤0.01% |
41,500
+5,200
| +14% | +$56.9K |
|
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.