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 | |
|---|---|---|---|---|---|---|
4676
Spectrum Brands
SPB
$2.03B
| $171K | ﹤0.01% |
3,243
-1,051
| -24% | -$62.7K |
|
4677
PUT
Woodward
WWD
$23B
| $171K | ﹤0.01% |
700
+600
| +600% | +$123K |
|
4678
Aquestive Therapeutics
AQST
$452M
| $170K | ﹤0.01% |
+51,546
| New | +$148K |
|
4679
AptarGroup
ATR
$8.69B
| $170K | ﹤0.01% |
1,087
+863
| +385% | +$130K |
|
4680
CALL
Essex Property Trust
ESS
$19.1B
| $170K | ﹤0.01% |
600
-2,000
| -77% | -$562K |
|
|
NIU
4681
PUT
Niu Technologies
NIU
$200M
| $170K | ﹤0.01% |
50,600
+41,700
| +469% | +$143K |
|
|
OCFT
4682
PUT
DELISTED
OneConnect Financial Technology
OCFT
| $170K | ﹤0.01% |
23,700
+4,500
| +23% | +$30K |
|
|
AIFC
4683
AI Financial Corp
AIFC
$51.7M
| $170K | ﹤0.01% |
23,537
+4,926
| +26% | +$34.6K |
|
4684
CALL
Alta Equipment Group
ALTG
$194M
| $169K | ﹤0.01% |
26,800
-7,200
| -21% | -$36.4K |
|
4685
CALL
Hexcel
HXL
$7.97B
| $169K | ﹤0.01% |
3,000
+100
| +3% | +$5.29K |
|
4686
Innovative Solutions & Support
ISSC
$319M
| $169K | ﹤0.01% |
12,226
+10,229
| +512% | +$92.9K |
|
|
JMIA
4687
Jumia Technologies
JMIA
$708M
| $169K | ﹤0.01% |
42,188
-16,741
| -28% | -$47.3K |
|
4688
PUT
Tucows
TCX
$104M
| $169K | ﹤0.01% |
8,600
+3,600
| +72% | +$64.5K |
|
4689
CALL
Xeris Biopharma Holdings
XERS
$1.45B
| $169K | ﹤0.01% |
36,200
-21,800
| -38% | -$99.9K |
|
|
TSPY
4690
TappAlpha S&P 500 Growth & Daily Income ETF
TSPY
$294M
| $169K | ﹤0.01% |
+6,935
| New | +$159K |
|
4691
Applied Industrial Technologies
AIT
$12.4B
| $168K | ﹤0.01% |
725
-145
| -17% | -$33K |
|
4692
PUT
Caleres
CAL
$432M
| $168K | ﹤0.01% |
13,800
+100
| +0.7% | +$1.5K |
|
4693
PUT
CBRE Group
CBRE
$43.3B
| $168K | ﹤0.01% |
1,200
-4,500
| -79% | -$569K |
|
|
CIM
4694
Chimera Investment
CIM
$1.06B
| $168K | ﹤0.01% |
12,146
-31,411
| -72% | -$401K |
|
4695
NeoGenomics
NEO
$1.96B
| $168K | ﹤0.01% |
23,076
+17,524
| +316% | +$141K |
|
4696
PUT
Q2 Holdings
QTWO
$3.78B
| $168K | ﹤0.01% |
1,800
-6,100
| -77% | -$515K |
|
4697
TriplePoint Venture Growth BDC
TPVG
$184M
| $168K | ﹤0.01% |
+24,032
| New | +$157K |
|
4698
Upexi
UPXI
$58.3M
| $168K | ﹤0.01% |
+56,532
| New | +$489K |
|
4699
CALL
Universal Corp
UVV
$1.37B
| $168K | ﹤0.01% |
2,900
-2,300
| -44% | -$132K |
|
|
SMCX
4700
Defiance Daily Target 2X Long SMCI ETF
SMCX
$127M
| $168K | ﹤0.01% |
1,707
+626
| +58% | +$43.5K |
|
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.