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 | |
|---|---|---|---|---|---|---|
5876
PUT
Arteris
AIP
$1.35B
| $52K | ﹤0.01% |
5,500
+3,500
| +175% | +$25.8K |
|
5877
PUT
Annovis Bio
ANVS
$75.3M
| $52K | ﹤0.01% |
24,100
-3,800
| -14% | -$7.5K |
|
5878
PUT
Apogee Enterprises
APOG
$832M
| $52K | ﹤0.01% |
1,300
+700
| +117% | +$28.9K |
|
5879
CALL
Cass Information Systems
CASS
$712M
| $52K | ﹤0.01% |
1,200
+700
| +140% | +$29.2K |
|
5880
CALL
Clearfield
CLFD
$420M
| $52K | ﹤0.01% |
1,200
-2,600
| -68% | -$89.1K |
|
5881
PUT
Canadian National Railway
CNI
$76.9B
| $52K | ﹤0.01% |
500
-61,200
| -99% | -$6.23M |
|
5882
PUT
Greystone Housing Impact Investors LP
GHI
$129M
| $52K | ﹤0.01% |
4,600
+3,900
| +557% | +$45.7K |
|
5883
Hexcel
HXL
$7.76B
| $52K | ﹤0.01% |
923
-2,909
| -76% | -$154K |
|
5884
PUT
ICU Medical
ICUI
$4.21B
| $52K | ﹤0.01% |
400
-3,300
| -89% | -$447K |
|
|
IRS
5885
CALL
IRSA Inversiones y Representaciones
IRS
$1.31B
| $52K | ﹤0.01% |
3,800
| – | – |
|
5886
CALL
Navient
NAVI
$794M
| $52K | ﹤0.01% |
3,700
+2,600
| +236% | +$33.4K |
|
5887
Enpro
NPO
$6.61B
| $52K | ﹤0.01% |
276
-88
| -24% | -$15K |
|
5888
CALL
PROG Holdings
PRG
$1.72B
| $52K | ﹤0.01% |
1,800
+1,500
| +500% | +$41.7K |
|
|
RWT
5889
PUT
Redwood Trust
RWT
$585M
| $52K | ﹤0.01% |
8,900
+1,200
| +16% | +$6.82K |
|
5890
CALL
VOC Energy
VOC
$49.5M
| $52K | ﹤0.01% |
18,500
+200
| +1% | +$590 |
|
5891
PUT
Cactus
WHD
$4.3B
| $52K | ﹤0.01% |
+1,200
| New | +$50.1K |
|
5892
CALL
Zevia
ZVIA
$116M
| $52K | ﹤0.01% |
16,200
-34,300
| -68% | -$90.3K |
|
5893
PUT
AGCO
AGCO
$7.76B
| $51K | ﹤0.01% |
500
-3,700
| -88% | -$353K |
|
5894
PUT
Anterix
ATEX
$1.82B
| $51K | ﹤0.01% |
2,000
-11,500
| -85% | -$337K |
|
5895
PUT
Fortune Brands Innovations
FBIN
$5.88B
| $51K | ﹤0.01% |
1,000
+900
| +900% | +$47.1K |
|
5896
PUT
Jones Lang LaSalle
JLL
$16.8B
| $51K | ﹤0.01% |
200
-200
| -50% | -$45.8K |
|
|
MFA
5897
CALL
MFA Financial
MFA
$935M
| $51K | ﹤0.01% |
5,400
-11,700
| -68% | -$111K |
|
5898
Amplify Alternative Harvest ETF
MJ
$101M
| $51K | ﹤0.01% |
2,858
+1,264
| +79% | +$23.8K |
|
|
NEXN
5899
CALL
Nexxen International
NEXN
$584M
| $51K | ﹤0.01% |
+4,900
| New | +$49.8K |
|
5900
PUT
NGL Energy Partners
NGL
$2.01B
| $51K | ﹤0.01% |
12,000
-18,000
| -60% | -$64.5K |
|
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.