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 | |
|---|---|---|---|---|---|---|
|
SRTA
4576
Strata Critical Medical Inc
SRTA
$421M
| $187K | ﹤0.01% |
46,420
+27,307
| +143% | +$88.9K |
|
|
CAN
4577
CALL
Canaan Creative
CAN
$172M
| $187K | ﹤0.01% |
303,800
+36,400
| +14% | +$25.6K |
|
4578
PUT
CenterPoint Energy
CNP
$28.3B
| $187K | ﹤0.01% |
5,100
-16,600
| -76% | -$615K |
|
4579
PUT
Capital Southwest
CSWC
$1.47B
| $187K | ﹤0.01% |
8,500
-6,400
| -43% | -$132K |
|
4580
CALL
Knife River
KNF
$4.33B
| $187K | ﹤0.01% |
+2,300
| New | +$209K |
|
|
SAIL
4581
PUT
SailPoint Inc
SAIL
$9.01B
| $187K | ﹤0.01% |
8,200
+6,900
| +531% | +$130K |
|
4582
CALL
BlackLine
BL
$1.9B
| $186K | ﹤0.01% |
3,300
+3,100
| +1,550% | +$160K |
|
|
CRESY
4583
CALL
Cresud
CRESY
$806M
| $186K | ﹤0.01% |
17,446
-2,219
| -11% | -$24.8K |
|
4584
CALL
CareTrust REIT
CTRE
$10B
| $186K | ﹤0.01% |
6,100
+900
| +17% | +$26K |
|
|
DRD
4585
CALL
DRDGold
DRD
$1.75B
| $186K | ﹤0.01% |
14,000
+2,900
| +26% | +$42.9K |
|
|
ACH
4586
Accendra Health
ACH
$254M
| $186K | ﹤0.01% |
20,494
+17,307
| +543% | +$128K |
|
4587
Invesco S&P 500 Equal Weight Energy ETF
RSPG
$553M
| $186K | ﹤0.01% |
+2,499
| New | +$182K |
|
|
SEE
4588
CALL
DELISTED
Sealed Air
SEE
| $186K | ﹤0.01% |
6,000
-47,700
| -89% | -$1.42M |
|
4589
Syndax Pharmaceuticals
SNDX
$1.7B
| $186K | ﹤0.01% |
19,921
+18,264
| +1,102% | +$201K |
|
4590
PUT
Applied Industrial Technologies
AIT
$12.4B
| $185K | ﹤0.01% |
800
-500
| -38% | -$114K |
|
4591
PUT
InfraCap MLP ETF
AMZA
$466M
| $185K | ﹤0.01% |
8,800
-200
| -2% | -$8.51K |
|
4592
CALL
Chefs' Warehouse
CHEF
$4.31B
| $185K | ﹤0.01% |
2,900
+2,200
| +314% | +$131K |
|
4593
PUT
Imperial Petroleum
IMPP
$212M
| $185K | ﹤0.01% |
60,300
+35,600
| +144% | +$97.9K |
|
4594
Kopin
KOPN
$586M
| $185K | ﹤0.01% |
121,161
+39,480
| +48% | +$51.4K |
|
4595
PUT
LGI Homes
LGIH
$1.35B
| $185K | ﹤0.01% |
3,600
+3,100
| +620% | +$170K |
|
4596
CALL
BGC Group
BGC
$5.64B
| $184K | ﹤0.01% |
18,000
-51,400
| -74% | -$472K |
|
|
PRO
4597
CALL
DELISTED
PROS Holdings
PRO
| $184K | ﹤0.01% |
11,800
+9,900
| +521% | +$169K |
|
4598
PUT
Triple Flag Precious Metals
TFPM
$5.93B
| $184K | ﹤0.01% |
7,800
+6,500
| +500% | +$142K |
|
4599
CALL
Aquestive Therapeutics
AQST
$452M
| $183K | ﹤0.01% |
55,400
+50,800
| +1,104% | +$146K |
|
4600
PUT
GigaCloud Technology
GCT
$1.55B
| $183K | ﹤0.01% |
9,300
-73,100
| -89% | -$1.17M |
|
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.