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 | |
|---|---|---|---|---|---|---|
2701
ProShares Ultra Bloomberg Natural Gas
BOIL
$417M
| $1.08M | ﹤0.01% |
11,734
+11,599
| +8,592% | +$1.34M |
|
|
SKE
2702
PUT
Skeena Resources
SKE
$3.36B
| $1.08M | ﹤0.01% |
67,900
+40,400
| +147% | +$509K |
|
2703
PUT
Pool Corp
POOL
$6.7B
| $1.08M | ﹤0.01% |
3,700
+2,600
| +236% | +$786K |
|
2704
PUT
Box
BOX
$4.02B
| $1.08M | ﹤0.01% |
31,500
+22,800
| +262% | +$748K |
|
|
MOMO
2705
Hello Group
MOMO
$869M
| $1.07M | ﹤0.01% |
127,346
-109,212
| -46% | -$715K |
|
2706
Palantir
PLTR
$295B
| $1.07M | ﹤0.01% |
+7,871
| New | +$923K |
|
|
IRBT
2707
PUT
DELISTED
iRobot
IRBT
| $1.07M | ﹤0.01% |
342,200
+155,200
| +83% | +$429K |
|
2708
CALL
PagerDuty
PD
$700M
| $1.07M | ﹤0.01% |
70,100
-48,800
| -41% | -$758K |
|
2709
CALL
Emcor
EME
$33.1B
| $1.07M | ﹤0.01% |
2,000
-3,100
| -61% | -$1.37M |
|
2710
Direxion Daily S&P 500 Bear 3x ETF
SPXS
$332M
| $1.07M | ﹤0.01% |
22,796
-3,857
| -14% | -$238K |
|
|
TSSI
2711
PUT
TSS Inc
TSSI
$272M
| $1.07M | ﹤0.01% |
37,100
+19,600
| +112% | +$258K |
|
2712
Alcoa
AA
$11.7B
| $1.07M | ﹤0.01% |
36,208
+15,858
| +78% | +$428K |
|
2713
CALL
New Oriental
EDU
$7.84B
| $1.07M | ﹤0.01% |
19,800
+100
| +0.5% | +$4.75K |
|
|
JKS
2714
CALL
JinkoSolar
JKS
$775M
| $1.07M | ﹤0.01% |
50,300
+33,000
| +191% | +$600K |
|
2715
Waste Management
WM
$95.9B
| $1.07M | ﹤0.01% |
+4,659
| New | +$1.08M |
|
2716
Praxis Precision Medicines
PRAX
$9.07B
| $1.06M | ﹤0.01% |
25,328
+22,030
| +668% | +$839K |
|
2717
Telephone and Data Systems
TDS
$3.91B
| $1.06M | ﹤0.01% |
29,849
+24,838
| +496% | +$872K |
|
2718
CALL
Casella Waste Systems
CWST
$5.69B
| $1.06M | ﹤0.01% |
9,200
+8,700
| +1,740% | +$1.01M |
|
2719
Allstate
ALL
$66.9B
| $1.06M | ﹤0.01% |
+5,269
| New | +$1.05M |
|
2720
PUT
Silicon Motion
SIMO
$9.19B
| $1.06M | ﹤0.01% |
14,100
+1,600
| +13% | +$90.9K |
|
2721
Amcor
AMCR
$20.6B
| $1.06M | ﹤0.01% |
+23,036
| New | +$1.06M |
|
2722
PUT
ReNew
RNW
$2.24B
| $1.05M | ﹤0.01% |
+152,700
| New | +$997K |
|
2723
PUT
Vera Therapeutics
VERA
$2.54B
| $1.05M | ﹤0.01% |
44,800
+37,100
| +482% | +$834K |
|
2724
PUT
Asana
ASAN
$1.58B
| $1.05M | ﹤0.01% |
78,000
+21,600
| +38% | +$339K |
|
2725
CALL
Cooper Companies
COO
$13.7B
| $1.05M | ﹤0.01% |
14,800
-7,100
| -32% | -$544K |
|
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.