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 | |
|---|---|---|---|---|---|---|
4001
PUT
National Vision
EYE
$1.75B
| $319K | ﹤0.01% |
13,900
+2,400
| +21% | +$40.9K |
|
4002
-1x Short VIX Futures ETF
SVIX
$169M
| $319K | ﹤0.01% |
20,578
-28,473
| -58% | -$394K |
|
4003
CALL
Triumph Financial Inc
TFIN
$1.84B
| $319K | ﹤0.01% |
5,800
-12,400
| -68% | -$690K |
|
|
ETHE
4004
PUT
Grayscale Ethereum Staking ETF Shares
ETHE
$1.56B
| $319K | ﹤0.01% |
+15,300
| New | +$279K |
|
4005
CALL
Emergent Biosolutions
EBS
$377M
| $318K | ﹤0.01% |
49,900
+43,800
| +718% | +$251K |
|
4006
CALL
Photronics
PLAB
$1.72B
| $318K | ﹤0.01% |
16,900
-20,000
| -54% | -$374K |
|
4007
PUT
Ryder
R
$9.98B
| $318K | ﹤0.01% |
2,000
+500
| +33% | +$73.5K |
|
4008
CALL
Zymeworks
ZYME
$1.66B
| $318K | ﹤0.01% |
25,400
-5,700
| -18% | -$67.9K |
|
4009
CALL
Alpha Pro Tech
APT
$51.1M
| $317K | ﹤0.01% |
67,800
+66,500
| +5,115% | +$301K |
|
4010
CALL
TETRA Technologies
TTI
$1.07B
| $317K | ﹤0.01% |
94,500
-5,100
| -5% | -$14.8K |
|
4011
PUT
Clearway Energy Class C
CWEN
$4.9B
| $316K | ﹤0.01% |
9,900
-43,300
| -81% | -$1.29M |
|
4012
ScottsMiracle-Gro
SMG
$4.25B
| $316K | ﹤0.01% |
4,799
-104,866
| -96% | -$6.06M |
|
4013
Crane Co
CR
$13.1B
| $315K | ﹤0.01% |
1,661
-8,562
| -84% | -$1.42M |
|
4014
CALL
Marten Transport
MRTN
$1.25B
| $315K | ﹤0.01% |
24,300
-22,900
| -49% | -$302K |
|
4015
PennantPark Floating Rate Capital
PFLT
$705M
| $315K | ﹤0.01% |
30,528
+29,295
| +2,376% | +$297K |
|
4016
Comfort Systems
FIX
$57.2B
| $314K | ﹤0.01% |
586
-1,281
| -69% | -$558K |
|
4017
CALL
Dorian LPG
LPG
$1.9B
| $314K | ﹤0.01% |
12,900
-3,400
| -21% | -$75.2K |
|
|
LTC
4018
CALL
LTC Properties
LTC
$2.14B
| $314K | ﹤0.01% |
9,100
-5,500
| -38% | -$194K |
|
4019
PUT
America Movil
AMX
$77.2B
| $313K | ﹤0.01% |
17,500
+15,300
| +695% | +$254K |
|
4020
CALL
Bio-Rad Laboratories Class A
BIO
$8.86B
| $313K | ﹤0.01% |
1,300
-800
| -38% | -$189K |
|
4021
CALL
Hamilton Lane
HLNE
$3.91B
| $312K | ﹤0.01% |
2,200
+400
| +22% | +$60.3K |
|
4022
Jackson Financial
JXN
$8.57B
| $312K | ﹤0.01% |
3,520
+3,465
| +6,300% | +$281K |
|
4023
Otis Worldwide
OTIS
$28B
| $312K | ﹤0.01% |
+3,151
| New | +$304K |
|
4024
CALL
Patria Investments
PAX
$1.77B
| $312K | ﹤0.01% |
22,200
+10,700
| +93% | +$128K |
|
4025
CALL
SandRidge Energy
SD
$485M
| $312K | ﹤0.01% |
28,900
+27,200
| +1,600% | +$277K |
|
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.