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 | |
|---|---|---|---|---|---|---|
2601
CALL
LPL Financial
LPLA
$26.3B
| $1.2M | ﹤0.01% |
3,200
-5,200
| -62% | -$1.82M |
|
|
HOLX
2602
CALL
DELISTED
Hologic
HOLX
| $1.2M | ﹤0.01% |
18,400
+5,100
| +38% | +$306K |
|
2603
PUT
Markel Group
MKL
$25B
| $1.2M | ﹤0.01% |
+600
| New | +$1.13M |
|
2604
CALL
Navios Maritime Partners
NMM
$2.25B
| $1.2M | ﹤0.01% |
31,800
-19,100
| -38% | -$705K |
|
2605
PUT
Beyond Meat
BYND
$288M
| $1.2M | ﹤0.01% |
343,100
-400,600
| -54% | -$1.16M |
|
2606
PUT
Planet Labs
PL
$7.3B
| $1.2M | ﹤0.01% |
196,100
+111,000
| +130% | +$453K |
|
2607
Verisk Analytics
VRSK
$26.4B
| $1.2M | ﹤0.01% |
+3,842
| New | +$1.16M |
|
2608
CALL
GlobalFoundries
GFS
$29.4B
| $1.2M | ﹤0.01% |
31,300
-48,400
| -61% | -$1.75M |
|
2609
PUT
Landstar System
LSTR
$6.8B
| $1.2M | ﹤0.01% |
+8,600
| New | +$1.19M |
|
2610
CALL
Mattel
MAT
$4.17B
| $1.2M | ﹤0.01% |
60,600
+34,700
| +134% | +$618K |
|
2611
PUT
Cincinnati Financial
CINF
$28.3B
| $1.19M | ﹤0.01% |
8,000
+1,600
| +25% | +$229K |
|
2612
CALL
Eldorado Gold
EGO
$8.31B
| $1.19M | ﹤0.01% |
58,600
-12,500
| -18% | -$243K |
|
2613
CALL
LKQ Corp
LKQ
$6.58B
| $1.19M | ﹤0.01% |
32,200
-172,300
| -84% | -$6.87M |
|
2614
PUT
Burford Capital
BUR
$907M
| $1.19M | ﹤0.01% |
83,400
+16,200
| +24% | +$212K |
|
2615
CALL
Freshworks
FRSH
$2.84B
| $1.19M | ﹤0.01% |
79,500
-27,400
| -26% | -$395K |
|
2616
CALL
Liberty Global Class C
LBTYK
$3.27B
| $1.18M | ﹤0.01% |
118,100
+72,400
| +158% | +$750K |
|
2617
PUT
Weibo
WB
$1.9B
| $1.18M | ﹤0.01% |
124,100
-199,200
| -62% | -$1.75M |
|
2618
PUT
Labcorp
LH
$24.3B
| $1.18M | ﹤0.01% |
4,500
-2,700
| -38% | -$657K |
|
2619
PUT
Trane Technologies
TT
$106B
| $1.18M | ﹤0.01% |
2,700
+1,600
| +145% | +$631K |
|
2620
CALL
TE Connectivity
TEL
$58.8B
| $1.18M | ﹤0.01% |
7,000
+4,300
| +159% | +$653K |
|
2621
Sony
SONY
$123B
| $1.18M | ﹤0.01% |
+45,172
| New | +$1.13M |
|
2622
State Street Consumer Discretionary Select Sector SPDR ETF
XLY
$21.4B
| $1.18M | ﹤0.01% |
10,818
-28,642
| -73% | -$2.93M |
|
2623
PUT
Invesco CurrencyShares Euro Currency Trust
FXE
$331M
| $1.17M | ﹤0.01% |
10,800
-16,900
| -61% | -$1.77M |
|
2624
CALL
Alphatec Holdings
ATEC
$1.27B
| $1.17M | ﹤0.01% |
105,300
-20,100
| -16% | -$231K |
|
2625
Evolv Technologies
EVLV
$943M
| $1.17M | ﹤0.01% |
187,134
+52,340
| +39% | +$242K |
|
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.