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 | |
|---|---|---|---|---|---|---|
|
NA
4101
CALL
Nano Labs
NA
$41.6M
| $403K | ﹤0.01% |
74,700
+71,400
| +2,164% | +$425K |
|
4102
CALL
Wolverine World Wide
WWW
$1.69B
| $403K | ﹤0.01% |
14,700
-15,400
| -51% | -$405K |
|
4103
CALL
Corpay
CPAY
$25.6B
| $403K | ﹤0.01% |
1,400
-2,600
| -65% | -$829K |
|
4104
PUT
Option Care Health
OPCH
$3.78B
| $402K | ﹤0.01% |
14,500
-15,600
| -52% | -$452K |
|
4105
CALL
Twist Bioscience
TWST
$5.3B
| $402K | ﹤0.01% |
14,300
+12,300
| +615% | +$373K |
|
4106
iShares 10-20 Year Treasury Bond ETF
TLH
$11B
| $401K | ﹤0.01% |
3,895
+1,973
| +103% | +$200K |
|
4107
PUT
3D Systems Corp
DDD
$405M
| $400K | ﹤0.01% |
138,000
+51,300
| +59% | +$106K |
|
4108
PUT
FLEX LNG
FLNG
$1.69B
| $400K | ﹤0.01% |
15,900
-4,100
| -21% | -$102K |
|
4109
PUT
Portland General Electric
POR
$5.83B
| $400K | ﹤0.01% |
9,100
-1,000
| -10% | -$42K |
|
4110
Perrigo
PRGO
$1.44B
| $400K | ﹤0.01% |
18,006
+245
| +1% | +$5.99K |
|
4111
PUT
Theravance Biopharma
TBPH
$874M
| $400K | ﹤0.01% |
27,400
+13,000
| +90% | +$164K |
|
4112
CALL
Akebia Therapeutics
AKBA
$335M
| $399K | ﹤0.01% |
146,400
+41,200
| +39% | +$137K |
|
|
APLT
4113
CALL
DELISTED
Applied Therapeutics
APLT
| $399K | ﹤0.01% |
660,300
+410,000
| +164% | +$193K |
|
4114
Gates Industrial Corporation Ltd.
GTES
$6.27B
| $399K | ﹤0.01% |
16,080
+15,685
| +3,971% | +$390K |
|
4115
PUT
Aquestive Therapeutics
AQST
$450M
| $398K | ﹤0.01% |
71,300
+59,000
| +480% | +$255K |
|
4116
PUT
CarGurus
CARG
$3.35B
| $398K | ﹤0.01% |
+10,700
| New | +$366K |
|
4117
Constellation Energy
CEG
$92.4B
| $398K | ﹤0.01% |
+1,210
| New | +$391K |
|
4118
CALL
Gulfport Energy Corp
GPOR
$2.81B
| $398K | ﹤0.01% |
2,200
-3,000
| -58% | -$522K |
|
4119
MarketAxess Holdings
MKTX
$4.45B
| $398K | ﹤0.01% |
2,289
-230
| -9% | -$45K |
|
4120
PUT
NCR Atleos
NATL
$3.51B
| $397K | ﹤0.01% |
10,100
-51,500
| -84% | -$1.79M |
|
4121
PUT
Qfin Holdings
QFIN
$1.67B
| $397K | ﹤0.01% |
13,800
-6,400
| -32% | -$218K |
|
4122
CALL
DTE Energy
DTE
$29.8B
| $396K | ﹤0.01% |
2,800
-12,400
| -82% | -$1.7M |
|
4123
CALL
Eagle Materials
EXP
$6.38B
| $396K | ﹤0.01% |
1,700
+200
| +13% | +$45.3K |
|
|
BRSL
4124
PUT
Brightstar Lottery PLC
BRSL
$1.9B
| $395K | ﹤0.01% |
22,900
-10,700
| -32% | -$171K |
|
4125
PUT
Green Plains
GPRE
$1.15B
| $394K | ﹤0.01% |
44,900
-41,500
| -48% | -$364K |
|
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.