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 | |
|---|---|---|---|---|---|---|
3676
CALL
Jacobs Solutions
J
$16.6B
| $425K | ﹤0.01% |
10,300
-5,254
| -34% | -$648K |
|
3677
Titan Machinery
TITN
$461M
| $425K | ﹤0.01% |
21,482
+1,370
| +7% | +$25.1K |
|
3678
CALL
Advanced Energy
AEIS
$10.9B
| $424K | ﹤0.01% |
3,200
+1,700
| +113% | +$187K |
|
3679
CALL
Arbe Robotics
ARBE
$78.5M
| $424K | ﹤0.01% |
238,400
-22,800
| -9% | -$32.6K |
|
3680
Old Republic International
ORI
$10.7B
| $424K | ﹤0.01% |
+11,031
| New | +$415K |
|
3681
CALL
TORM
TRMD
$3.06B
| $424K | ﹤0.01% |
25,500
-27,400
| -52% | -$458K |
|
3682
CALL
Chegg
CHGG
$120M
| $423K | ﹤0.01% |
350,200
+219,800
| +169% | +$203K |
|
3683
Fomento Económico Mexicano
FMX
$43.5B
| $423K | ﹤0.01% |
4,112
+3,329
| +425% | +$344K |
|
3684
PUT
Modine Manufacturing
MOD
$11.1B
| $423K | ﹤0.01% |
4,300
-2,400
| -36% | -$214K |
|
|
JBS
3685
PUT
JBS N.V.
JBS
$45.7B
| $423K | ﹤0.01% |
+29,000
| New | +$408K |
|
3686
PUT
Ecopetrol
EC
$32.4B
| $422K | ﹤0.01% |
47,700
-51,000
| -52% | -$451K |
|
3687
PUT
Globe Life
GL
$13.8B
| $422K | ﹤0.01% |
3,400
-9,000
| -73% | -$1.09M |
|
|
TGI
3688
CALL
DELISTED
Triumph Group
TGI
| $422K | ﹤0.01% |
16,400
+8,900
| +119% | +$227K |
|
3689
Boot Barn
BOOT
$4.81B
| $421K | ﹤0.01% |
2,775
-9,956
| -78% | -$1.32M |
|
3690
CALL
Vanguard FTSE Developed Markets ETF
VEA
$226B
| $421K | ﹤0.01% |
7,400
+1,000
| +16% | +$53.6K |
|
3691
Cadiz
CDZI
$263M
| $420K | ﹤0.01% |
140,474
+89,645
| +176% | +$258K |
|
3692
CALL
Labcorp
LH
$25.7B
| $420K | ﹤0.01% |
1,600
-15,700
| -91% | -$3.82M |
|
3693
CALL
Merit Medical Systems
MMSI
$4.67B
| $420K | ﹤0.01% |
+4,500
| New | +$426K |
|
3694
PUT
Neonode
NEON
$12.8M
| $420K | ﹤0.01% |
16,500
+7,600
| +85% | +$90.6K |
|
3695
Transocean
RIG
$5.58B
| $420K | ﹤0.01% |
162,430
-71,800
| -31% | -$185K |
|
3696
CALL
Eversource Energy
ES
$28.4B
| $419K | ﹤0.01% |
6,600
-4,500
| -41% | -$277K |
|
3697
CALL
Fox Class B
FOX
$21.7B
| $419K | ﹤0.01% |
7,500
-20,900
| -74% | -$1.02M |
|
3698
PUT
Mitsubishi UFJ Financial
MUFG
$253B
| $419K | ﹤0.01% |
30,600
+22,600
| +283% | +$292K |
|
3699
CALL
The RealReal
REAL
$1.43B
| $419K | ﹤0.01% |
87,500
-113,600
| -56% | -$625K |
|
3700
PUT
Twist Bioscience
TWST
$5.4B
| $419K | ﹤0.01% |
11,400
-600
| -5% | -$20.7K |
|
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.