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 |
NVIDIA
NVDA
|
+$172M |
| 2 |
Apple
AAPL
|
+$156M |
| 3 |
Broadcom
AVGO
|
+$101M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$57.2M |
| 5 |
UnitedHealth
UNH
|
+$55.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$140M |
| 2 |
Amazon
AMZN
|
+$47.9M |
| 3 |
Netflix
NFLX
|
+$38.3M |
| 4 |
TSMC
TSM
|
+$37.3M |
| 5 |
Pfizer
PFE
|
+$36.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.74% |
| 2 | Communication Services | 0.19% |
| 3 | Consumer Discretionary | 0.18% |
| 4 | Healthcare | 0.17% |
| 5 | Financials | 0.14% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3726
PUT
Dream Finders Homes
DFH
$1.49B
| $409K | ﹤0.01% |
16,300
+10,200
| +167% | +$229K |
|
|
MESO
3727
PUT
Mesoblast
MESO
$1.87B
| $409K | ﹤0.01% |
37,600
+14,600
| +63% | +$164K |
|
3728
CALL
Teledyne Technologies
TDY
$30.1B
| $409K | ﹤0.01% |
800
+200
| +33% | +$96.5K |
|
|
ETHW
3729
CALL
Bitwise Ethereum ETF
ETHW
$201M
| $409K | ﹤0.01% |
+22,700
| New | +$358K |
|
3730
CAE Inc. Common Shares
CAE
$8.48B
| $408K | ﹤0.01% |
+13,945
| New | +$352K |
|
|
PRMB
3731
PUT
Primo Brands
PRMB
$8.54B
| $408K | ﹤0.01% |
13,800
+5,000
| +57% | +$160K |
|
3732
CALL
Popular Inc
BPOP
$11.1B
| $407K | ﹤0.01% |
3,700
+900
| +32% | +$88.9K |
|
3733
Lands' End
LE
$389M
| $407K | ﹤0.01% |
38,062
+36,280
| +2,036% | +$328K |
|
3734
First Interstate BancSystem
FIBK
$3.7B
| $406K | ﹤0.01% |
+14,102
| New | +$380K |
|
3735
GeoPark
GPRK
$600M
| $406K | ﹤0.01% |
62,270
+52,355
| +528% | +$358K |
|
3736
Larimar Therapeutics
LRMR
$398M
| $405K | ﹤0.01% |
140,424
+140,160
| +53,091% | +$324K |
|
3737
PUT
Northern Oil and Gas
NOG
$2.16B
| $405K | ﹤0.01% |
14,300
+5,400
| +61% | +$145K |
|
3738
PUT
Outset Medical
OM
$87.5M
| $405K | ﹤0.01% |
21,100
-44,100
| -68% | -$688K |
|
3739
Evolent Health
EVH
$420M
| $404K | ﹤0.01% |
35,918
+32,142
| +851% | +$295K |
|
3740
Ambarella
AMBA
$3.03B
| $403K | ﹤0.01% |
+6,103
| New | +$324K |
|
3741
Churchill Downs
CHDN
$6.21B
| $402K | ﹤0.01% |
3,988
+3,035
| +318% | +$297K |
|
|
CRON
3742
PUT
Cronos Group
CRON
$1.06B
| $402K | ﹤0.01% |
210,900
-293,100
| -58% | -$555K |
|
|
EPIX
3743
CALL
DELISTED
ESSA Pharma
EPIX
| $402K | ﹤0.01% |
236,700
+184,700
| +355% | +$312K |
|
3744
Acadia Pharmaceuticals
ACAD
$4.45B
| $401K | ﹤0.01% |
18,631
-63,318
| -77% | -$1.18M |
|
|
IPG
3745
CALL
DELISTED
Interpublic Group of Companies
IPG
| $401K | ﹤0.01% |
16,400
-15,300
| -48% | -$372K |
|
3746
PUT
Lantheus
LNTH
$6.68B
| $401K | ﹤0.01% |
4,900
-6,900
| -58% | -$606K |
|
3747
Rogers Corp
ROG
$2.12B
| $401K | ﹤0.01% |
5,863
-114
| -2% | -$7.35K |
|
3748
CALL
SkyWater Technology
SKYT
$1.53B
| $401K | ﹤0.01% |
40,800
+11,200
| +38% | +$90.4K |
|
3749
T-Rex 2X Inverse Tesla Daily Target ETF
TSLZ
$49.8M
| $401K | ﹤0.01% |
12,152
+7,279
| +149% | +$346K |
|
3750
PUT
Amplify Energy
AMPY
$152M
| $400K | ﹤0.01% |
125,100
-21,600
| -15% | -$64.2K |
|
Similar funds
Simplex Trading's Q2 2025 Portfolio in Review
As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.
- Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
- Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
- Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
- Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
- Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
- Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.
Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.