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 | |
|---|---|---|---|---|---|---|
4776
Kilroy Realty
KRC
$4.59B
| $155K | ﹤0.01% |
4,532
+1,051
| +30% | +$34.3K |
|
4777
CALL
Nexstar Media Group
NXST
$6.01B
| $155K | ﹤0.01% |
900
-3,100
| -78% | -$508K |
|
4778
Roundhill Daily 2X Long Magnificent Seven ETF
MAGX
$48.5M
| $155K | ﹤0.01% |
3,640
+2,437
| +203% | +$84.7K |
|
4779
CALL
Brookfield Asset Management
BAM
$75.6B
| $154K | ﹤0.01% |
2,800
-2,300
| -45% | -$123K |
|
|
DRD
4780
PUT
DRDGold
DRD
$1.75B
| $154K | ﹤0.01% |
11,600
+4,000
| +53% | +$59.2K |
|
4781
CALL
The Ensign Group
ENSG
$10.6B
| $154K | ﹤0.01% |
+1,000
| New | +$140K |
|
|
LNW
4782
PUT
DELISTED
Light & Wonder
LNW
| $154K | ﹤0.01% |
1,600
+1,000
| +167% | +$85.6K |
|
|
PINE
4783
PUT
Alpine Income Property Trust
PINE
$336M
| $154K | ﹤0.01% |
10,500
-100
| -0.9% | -$1.54K |
|
4784
CALL
Allot
ALLT
$362M
| $153K | ﹤0.01% |
17,900
+7,400
| +70% | +$53.2K |
|
4785
CALL
Anterix
ATEX
$1.72B
| $153K | ﹤0.01% |
6,000
-2,400
| -29% | -$70.2K |
|
4786
Crinetics Pharmaceuticals
CRNX
$8.88B
| $153K | ﹤0.01% |
5,341
+5,167
| +2,970% | +$160K |
|
4787
National Grid
NGG
$79.3B
| $153K | ﹤0.01% |
2,087
-18,357
| -90% | -$1.26M |
|
4788
Photronics
PLAB
$1.65B
| $153K | ﹤0.01% |
+8,156
| New | +$153K |
|
|
MRX
4789
Marex Group Limited Ordinary Shares
MRX
$4.54B
| $153K | ﹤0.01% |
+3,888
| New | +$162K |
|
|
CVSA
4790
PUT
Covista Inc
CVSA
$4.55B
| $152K | ﹤0.01% |
1,200
-9,800
| -89% | -$1.16M |
|
4791
Expensify
EXFY
$174M
| $152K | ﹤0.01% |
58,962
+43,841
| +290% | +$112K |
|
4792
PUT
Magnolia Oil & Gas
MGY
$5.93B
| $152K | ﹤0.01% |
6,800
+5,200
| +325% | +$115K |
|
4793
CALL
Tanger
SKT
$4.78B
| $152K | ﹤0.01% |
5,000
+1,700
| +52% | +$52.1K |
|
|
WIMI
4794
CALL
WiMi Hologram Cloud
WIMI
$22.1M
| $152K | ﹤0.01% |
55,000
+19,520
| +55% | +$81K |
|
|
SEI
4795
CALL
Solaris Energy Infrastructure
SEI
$2.66B
| $152K | ﹤0.01% |
5,400
-104,500
| -95% | -$2.46M |
|
4796
CALL
LendingTree
TREE
$551M
| $151K | ﹤0.01% |
4,100
-6,200
| -60% | -$250K |
|
4797
PUT
Amneal Pharmaceuticals
AMRX
$6.1B
| $150K | ﹤0.01% |
18,600
| – | – |
|
4798
Applovin
APP
$134B
| $150K | ﹤0.01% |
+430
| New | +$139K |
|
4799
Haemonetics
HAE
$3.88B
| $150K | ﹤0.01% |
+2,012
| New | +$133K |
|
4800
iShares Russell Mid-Cap Growth ETF
IWP
$19.4B
| $150K | ﹤0.01% |
1,082
-758
| -41% | -$95.9K |
|
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.