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 |
Microsoft
MSFT
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
7151
CALL
Sun Communities
SUI
$15.3B
| $25K | ﹤0.01% |
200
-300
| -60% | -$37.9K |
|
7152
CALL
Talkspace
TALK
$873M
| $25K | ﹤0.01% |
9,400
-2,400
| -20% | -$6.22K |
|
7153
PUT
Protara Therapeutics
TARA
$221M
| $25K | ﹤0.01% |
5,900
+400
| +7% | +$1.29K |
|
7154
PUT
Tango Therapeutics
TNGX
$4.34B
| $25K | ﹤0.01% |
+3,000
| New | +$20.3K |
|
7155
PUT
Tootsie Roll Industries
TR
$2.94B
| $25K | ﹤0.01% |
618
+206
| +50% | +$7.79K |
|
7156
PUT
TechTarget
TTGT
$323M
| $25K | ﹤0.01% |
4,400
+3,800
| +633% | +$25.2K |
|
7157
PUT
Victory Capital Holdings
VCTR
$6.28B
| $25K | ﹤0.01% |
400
-300
| -43% | -$20.6K |
|
|
VIVO
7158
VivoPower PLC
VIVO
$119M
| $25K | ﹤0.01% |
+5,753
| New | +$29.7K |
|
7159
PUT
Valvoline
VVV
$5.13B
| $25K | ﹤0.01% |
700
-100
| -13% | -$3.82K |
|
7160
Watts Water Technologies
WTS
$11.6B
| $25K | ﹤0.01% |
+93
| New | +$24.9K |
|
7161
PUT
Asbury Automotive
ABG
$4.49B
| $24K | ﹤0.01% |
+100
| New | +$24.3K |
|
7162
PUT
Alight
ALIT
$523M
| $24K | ﹤0.01% |
375
+20
| +6% | +$1.77K |
|
7163
PUT
Arrow Electronics
ARW
$10.8B
| $24K | ﹤0.01% |
+200
| New | +$25.2K |
|
7164
CALL
Asure Software
ASUR
$237M
| $24K | ﹤0.01% |
+3,000
| New | +$26.8K |
|
7165
BioAtla
BCAB
$5.86M
| $24K | ﹤0.01% |
723
+457
| +172% | +$10.6K |
|
7166
Corporacion America
CAAP
$4.26B
| $24K | ﹤0.01% |
+1,366
| New | +$27.5K |
|
7167
CALL
Compugen
CGEN
$214M
| $24K | ﹤0.01% |
16,800
+1,200
| +8% | +$1.78K |
|
|
7168
PUT
Compugen
CGEN
$214M
| $24K | ﹤0.01% |
16,500
| – | – |
|
|
CHCT
7169
PUT
Community Healthcare Trust
CHCT
$543M
| $24K | ﹤0.01% |
1,600
-800
| -33% | -$12.5K |
|
7170
Conduent
CNDT
$251M
| $24K | ﹤0.01% |
8,921
-38,216
| -81% | -$103K |
|
7171
CALL
Viant Technology
DSP
$227M
| $24K | ﹤0.01% |
2,800
+1,800
| +180% | +$20.5K |
|
7172
PUT
Full House Resorts
FLL
$83.8M
| $24K | ﹤0.01% |
7,500
| – | – |
|
7173
Gaming and Leisure Properties
GLPI
$13B
| $24K | ﹤0.01% |
+535
| New | +$25.2K |
|
7174
PUT
Gray Television
GTN
$430M
| $24K | ﹤0.01% |
4,300
+800
| +23% | +$4.34K |
|
7175
PUT
Helix Energy Solutions
HLX
$1.35B
| $24K | ﹤0.01% |
3,700
+2,500
| +208% | +$15.7K |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.