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 | |
|---|---|---|---|---|---|---|
1901
CALL
UroGen Pharma
URGN
$2B
| $2.53M | ﹤0.01% |
184,900
+177,900
| +2,541% | +$1.71M |
|
1902
CALL
ADMA Biologics
ADMA
$1.92B
| $2.53M | ﹤0.01% |
139,000
+500
| +0.4% | +$10.2K |
|
1903
CALL
Qorvo
QRVO
$7.63B
| $2.53M | ﹤0.01% |
29,800
-13,900
| -32% | -$1M |
|
1904
PUT
Intuitive Machines
LUNR
$2.07B
| $2.53M | ﹤0.01% |
232,500
-131,900
| -36% | -$1.29M |
|
1905
CALL
Dave Inc
DAVE
$5.12B
| $2.52M | ﹤0.01% |
9,400
-18,500
| -66% | -$2.92M |
|
1906
CALL
Avantor
AVTR
$7.81B
| $2.51M | ﹤0.01% |
186,400
-248,900
| -57% | -$3.41M |
|
1907
CALL
Delek US
DK
$3.87B
| $2.5M | ﹤0.01% |
118,300
+24,600
| +26% | +$413K |
|
1908
PUT
Galicia Financial Group
GGAL
$7.92B
| $2.5M | ﹤0.01% |
49,700
-49,400
| -50% | -$2.83M |
|
1909
CALL
RingCentral
RNG
$4.05B
| $2.5M | ﹤0.01% |
88,200
+10,100
| +13% | +$261K |
|
1910
PUT
Wheaton Precious Metals
WPM
$50.6B
| $2.5M | ﹤0.01% |
27,800
-53,900
| -66% | -$4.54M |
|
1911
PUT
ProShares Ether Strategy ETF
EETH
$54.2M
| $2.5M | ﹤0.01% |
77,100
+7,900
| +11% | +$321K |
|
|
APLS
1912
CALL
DELISTED
Apellis Pharmaceuticals
APLS
| $2.49M | ﹤0.01% |
144,100
+67,200
| +87% | +$1.24M |
|
1913
DexCom
DXCM
$27.6B
| $2.49M | ﹤0.01% |
28,566
-5,247
| -16% | -$411K |
|
1914
Solventum
SOLV
$13.5B
| $2.49M | ﹤0.01% |
32,783
+25,237
| +334% | +$1.79M |
|
1915
PUT
Everest Group
EG
$15.2B
| $2.48M | ﹤0.01% |
7,300
+4,000
| +121% | +$1.38M |
|
1916
PUT
Medpace
MEDP
$16.8B
| $2.48M | ﹤0.01% |
7,900
+6,800
| +618% | +$2.04M |
|
1917
PUT
Regions Financial
RF
$26.3B
| $2.48M | ﹤0.01% |
105,400
+39,300
| +59% | +$832K |
|
1918
ACM Research
ACMR
$5.83B
| $2.48M | ﹤0.01% |
95,710
-14,418
| -13% | -$324K |
|
1919
PUT
Main Street Capital
MAIN
$4.97B
| $2.47M | ﹤0.01% |
41,800
-8,400
| -17% | -$464K |
|
1920
CALL
OneMain Financial
OMF
$6.9B
| $2.47M | ﹤0.01% |
43,300
+5,700
| +15% | +$284K |
|
1921
Kyndryl
KD
$2.66B
| $2.47M | ﹤0.01% |
58,798
-26,215
| -31% | -$948K |
|
1922
Teck Resources
TECK
$29.5B
| $2.46M | ﹤0.01% |
61,003
-19,302
| -24% | -$697K |
|
1923
CALL
Recursion Pharmaceuticals
RXRX
$1.57B
| $2.46M | ﹤0.01% |
486,300
-219,800
| -31% | -$1.08M |
|
1924
Arista Networks
ANET
$219B
| $2.46M | ﹤0.01% |
+24,044
| New | +$2.08M |
|
1925
CALL
Campbell Soup
CPB
$6.51B
| $2.46M | ﹤0.01% |
80,200
-31,600
| -28% | -$1.11M |
|
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.