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 | |
|---|---|---|---|---|---|---|
2001
CALL
Amplify Energy
AMPY
$163M
| $2.22M | ﹤0.01% |
693,900
+622,200
| +868% | +$1.85M |
|
2002
PUT
Zeta Global
ZETA
$4.77B
| $2.22M | ﹤0.01% |
143,200
+4,300
| +3% | +$57.1K |
|
2003
PUT
Domo
DOMO
$166M
| $2.22M | ﹤0.01% |
158,700
+147,800
| +1,356% | +$1.49M |
|
2004
PUT
Photronics
PLAB
$1.79B
| $2.22M | ﹤0.01% |
117,700
+111,600
| +1,830% | +$2.09M |
|
|
PENG
2005
CALL
Penguin Solutions Inc
PENG
$2.76B
| $2.21M | ﹤0.01% |
111,700
+76,400
| +216% | +$1.38M |
|
|
GENVR
2006
CALL
Gen Digital Inc Contingent Value Rights
GENVR
| $2.21M | ﹤0.01% |
+75,100
| New | +$528K |
|
|
MAG
2007
CALL
DELISTED
MAG Silver
MAG
| $2.21M | ﹤0.01% |
104,400
-33,500
| -24% | -$595K |
|
2008
CALL
Hecla Mining
HL
$10.2B
| $2.2M | ﹤0.01% |
367,800
-162,100
| -31% | -$894K |
|
2009
CALL
Middleby
MIDD
$6.05B
| $2.2M | ﹤0.01% |
15,300
+3,600
| +31% | +$507K |
|
2010
PUT
Norfolk Southern
NSC
$78.8B
| $2.2M | ﹤0.01% |
8,600
+2,300
| +37% | +$542K |
|
2011
PUT
Church & Dwight Co
CHD
$23.1B
| $2.2M | ﹤0.01% |
22,900
-1,300
| -5% | -$128K |
|
2012
Wynn Resorts
WYNN
$10.1B
| $2.2M | ﹤0.01% |
23,488
-33,142
| -59% | -$2.81M |
|
2013
CALL
Rithm Capital
RITM
$5.09B
| $2.2M | ﹤0.01% |
194,700
-47,600
| -20% | -$524K |
|
2014
The Mosaic Company
MOS
$7.09B
| $2.2M | ﹤0.01% |
60,217
+18,084
| +43% | +$579K |
|
2015
CALL
Teladoc Health
TDOC
$1.58B
| $2.19M | ﹤0.01% |
251,800
-15,600
| -6% | -$113K |
|
2016
PUT
Pitney Bowes
PBI
$2.42B
| $2.19M | ﹤0.01% |
201,000
+82,500
| +70% | +$776K |
|
2017
Fastenal
FAST
$54B
| $2.19M | ﹤0.01% |
52,181
-5,831
| -10% | -$237K |
|
2018
RB Global
RBA
$20.8B
| $2.19M | ﹤0.01% |
+20,635
| New | +$2.12M |
|
2019
PUT
Schwab US Broad Market ETF
SCHB
$42.8B
| $2.19M | ﹤0.01% |
81,900
-5,400
| -6% | -$119K |
|
2020
CALL
Viasat
VSAT
$9.79B
| $2.18M | ﹤0.01% |
149,600
+17,300
| +13% | +$175K |
|
2021
PUT
Hawaiian Electric Industries
HE
$2.33B
| $2.18M | ﹤0.01% |
205,000
+126,700
| +162% | +$1.32M |
|
|
QLTB
2022
PUT
DELISTED
ISHARES BAA BA RATED CORP BOND FUND
QLTB
| $2.18M | ﹤0.01% |
9,200
-5,900
| -39% | -$1.4M |
|
2023
CALL
Nokia
NOK
$50.8B
| $2.18M | ﹤0.01% |
420,200
-236,700
| -36% | -$1.22M |
|
2024
NextDecade
NEXT
$1.85B
| $2.17M | ﹤0.01% |
243,834
-185,488
| -43% | -$1.44M |
|
2025
CALL
Denison Mines
DNN
$2.63B
| $2.17M | ﹤0.01% |
1,192,800
-10,600
| -0.9% | -$16.1K |
|
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.