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 | |
|---|---|---|---|---|---|---|
|
MTA
5001
Metalla Royalty & Streaming
MTA
$689M
| $126K | ﹤0.01% |
32,824
+19,401
| +145% | +$61.9K |
|
5002
Neuronetics
STIM
$127M
| $126K | ﹤0.01% |
36,193
-680
| -2% | -$2.68K |
|
5003
CALL
Alpha and Omega Semiconductor
AOSL
$829M
| $125K | ﹤0.01% |
4,900
-7,000
| -59% | -$152K |
|
|
ASRT
5004
CALL
DELISTED
Assertio
ASRT
| $125K | ﹤0.01% |
13,073
-2,187
| -14% | -$21K |
|
5005
Cincinnati Financial
CINF
$27.8B
| $125K | ﹤0.01% |
845
-84
| -9% | -$12K |
|
5006
PUT
Expeditors International
EXPD
$22.3B
| $125K | ﹤0.01% |
1,100
+1,000
| +1,000% | +$112K |
|
5007
Fidelity National Financial
FNF
$14.4B
| $125K | ﹤0.01% |
+2,244
| New | +$131K |
|
5008
PUT
Liberty Media Series A
FWONA
$23.4B
| $125K | ﹤0.01% |
1,200
+100
| +9% | +$8.45K |
|
5009
CALL
Ocugen
OCGN
$403M
| $125K | ﹤0.01% |
129,500
+27,800
| +27% | +$23.1K |
|
5010
Direxion Daily Retail Bull 3X ETF
RETL
$32.5M
| $125K | ﹤0.01% |
16,566
+15,096
| +1,027% | +$99.2K |
|
5011
CALL
RCI Hospitality Holdings
RICK
$202M
| $125K | ﹤0.01% |
3,300
-100
| -3% | -$4.04K |
|
5012
PUT
Reliance Steel & Aluminium
RS
$20.6B
| $125K | ﹤0.01% |
400
| – | – |
|
5013
CALL
Vontier
VNT
$4.54B
| $125K | ﹤0.01% |
3,400
+1,200
| +55% | +$40.9K |
|
5014
CALL
XPEL
XPEL
$1.22B
| $125K | ﹤0.01% |
3,500
+3,400
| +3,400% | +$112K |
|
5015
American Battery Technology Co
ABAT
$280M
| $124K | ﹤0.01% |
+76,800
| New | +$99.7K |
|
5016
PUT
BJ's Restaurants
BJRI
$1.47B
| $124K | ﹤0.01% |
2,800
+1,400
| +100% | +$55.2K |
|
5017
Conduent
CNDT
$253M
| $124K | ﹤0.01% |
47,137
-13,164
| -22% | -$30.9K |
|
5018
Endava
DAVA
$165M
| $124K | ﹤0.01% |
8,099
+7,840
| +3,027% | +$132K |
|
|
EFC
5019
Ellington Financial
EFC
$1.69B
| $124K | ﹤0.01% |
+9,612
| New | +$122K |
|
5020
PUT
Hilton Grand Vacations
HGV
$4.04B
| $124K | ﹤0.01% |
3,000
-1,000
| -25% | -$37.7K |
|
5021
CALL
Middlesex Water
MSEX
$1.07B
| $124K | ﹤0.01% |
2,300
+1,700
| +283% | +$101K |
|
5022
CALL
Spero Therapeutics
SPRO
$68.9M
| $124K | ﹤0.01% |
+42,800
| New | +$61.6K |
|
5023
CALL
West Fraser Timber
WFG
$5.21B
| $124K | ﹤0.01% |
1,700
+1,400
| +467% | +$104K |
|
|
TBCH
5024
CALL
Turtle Beach Corp
TBCH
$238M
| $124K | ﹤0.01% |
9,000
+4,000
| +80% | +$47.7K |
|
|
ABK
5025
PUT
DELISTED
Ambac Financial Group
ABK
| $124K | ﹤0.01% |
17,600
+2,200
| +14% | +$15.5K |
|
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.