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 | |
|---|---|---|---|---|---|---|
1676
CALL
Ionis Pharmaceuticals
IONS
$9.35B
| $3.34M | ﹤0.01% |
84,600
+45,400
| +116% | +$1.49M |
|
1677
CALL
Webster Financial
WBS
$12.3B
| $3.34M | ﹤0.01% |
61,100
+16,600
| +37% | +$828K |
|
1678
PUT
BorgWarner
BWA
$13.2B
| $3.33M | ﹤0.01% |
99,600
-31,900
| -24% | -$978K |
|
1679
CALL
CMS Energy
CMS
$23.1B
| $3.33M | ﹤0.01% |
48,100
+46,200
| +2,432% | +$3.29M |
|
1680
PUT
Fastenal
FAST
$54B
| $3.33M | ﹤0.01% |
79,300
-123,900
| -61% | -$5.03M |
|
1681
GitLab
GTLB
$5.28B
| $3.32M | ﹤0.01% |
73,695
+54,359
| +281% | +$2.49M |
|
|
KOCG
1682
CALL
DELISTED
FIS Knights of Columbus Global Belief ETF
KOCG
| $3.32M | ﹤0.01% |
65,100
+57,200
| +724% | +$1.66M |
|
1683
CALL
Travelers Companies
TRV
$80.8B
| $3.32M | ﹤0.01% |
12,400
-1,300
| -9% | -$343K |
|
1684
CALL
Flutter Entertainment
FLUT
$17.6B
| $3.31M | ﹤0.01% |
11,600
-57,300
| -83% | -$14.1M |
|
|
CDTX
1685
DELISTED
Cidara Therapeutics
CDTX
| $3.31M | ﹤0.01% |
+68,030
| New | +$1.63M |
|
1686
PUT
Gogo Inc
GOGO
$515M
| $3.31M | ﹤0.01% |
225,500
+76,700
| +52% | +$780K |
|
|
BABO
1687
CALL
YieldMax BABA Option Income Strategy ETF
BABO
$13.7M
| $3.31M | ﹤0.01% |
82,400
-6,400
| -7% | -$106K |
|
|
VSXY
1688
PUT
Victoria's Secret
VSXY
$6.64B
| $3.3M | ﹤0.01% |
178,200
+78,500
| +79% | +$1.54M |
|
1689
CALL
Semtech
SMTC
$11.7B
| $3.29M | ﹤0.01% |
73,000
-208,000
| -74% | -$7.4M |
|
1690
CALL
Old Dominion Freight Line
ODFL
$48.5B
| $3.29M | ﹤0.01% |
20,300
+3,700
| +22% | +$590K |
|
1691
CALL
News Corp Class B
NWS
$16.4B
| $3.29M | ﹤0.01% |
110,600
-98,800
| -47% | -$3.13M |
|
|
CMA
1692
DELISTED
Comerica
CMA
| $3.28M | ﹤0.01% |
55,067
+31,835
| +137% | +$1.78M |
|
1693
CALL
ARK 21Shares Bitcoin ETF
ARKB
$2.45B
| $3.27M | ﹤0.01% |
91,400
+26,300
| +40% | +$862K |
|
1694
PUT
Kodak
KODK
$806M
| $3.27M | ﹤0.01% |
578,900
-21,400
| -4% | -$129K |
|
1695
Valero Energy
VLO
$89.8B
| $3.26M | ﹤0.01% |
24,279
+23,133
| +2,019% | +$2.88M |
|
1696
Credo Technology Group
CRDO
$39.7B
| $3.26M | ﹤0.01% |
35,215
+14,700
| +72% | +$857K |
|
1697
PUT
Bausch Health
BHC
$1.65B
| $3.25M | ﹤0.01% |
487,500
-2,100
| -0.4% | -$10.8K |
|
1698
CALL
Capri Holdings
CPRI
$1.77B
| $3.24M | ﹤0.01% |
183,300
-638,600
| -78% | -$10.5M |
|
1699
PUT
monday.com
MNDY
$3.27B
| $3.24M | ﹤0.01% |
10,300
-5,900
| -36% | -$1.64M |
|
1700
Progress Software
PRGS
$1.55B
| $3.24M | ﹤0.01% |
+50,718
| New | +$3.08M |
|
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.