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 | |
|---|---|---|---|---|---|---|
3626
Royal Gold
RGLD
$16.7B
| $443K | ﹤0.01% |
+2,492
| New | +$441K |
|
3627
PUT
Sportradar
SRAD
$4.43B
| $443K | ﹤0.01% |
15,800
-15,100
| -49% | -$359K |
|
3628
PUT
Virtu Financial
VIRT
$5.06B
| $443K | ﹤0.01% |
9,900
+1,000
| +11% | +$40.3K |
|
3629
CALL
Arcus Biosciences
RCUS
$3.39B
| $442K | ﹤0.01% |
54,300
+52,000
| +2,261% | +$444K |
|
3630
CALL
AMES National
ATLO
$273M
| $441K | ﹤0.01% |
24,800
+17,500
| +240% | +$304K |
|
3631
CALL
Everest Group
EG
$15.8B
| $441K | ﹤0.01% |
1,300
-1,800
| -58% | -$621K |
|
3632
CALL
Evergy
EVRG
$19.9B
| $441K | ﹤0.01% |
6,400
-28,800
| -82% | -$1.94M |
|
|
NVMI
3633
CALL
Nova
NVMI
$12.8B
| $440K | ﹤0.01% |
1,600
-9,800
| -86% | -$1.99M |
|
3634
PUT
FLEX LNG
FLNG
$1.69B
| $439K | ﹤0.01% |
20,000
-24,500
| -55% | -$574K |
|
3635
Huntsman Corp
HUN
$2.04B
| $439K | ﹤0.01% |
+42,180
| New | +$514K |
|
3636
PUT
Solventum
SOLV
$14.9B
| $439K | ﹤0.01% |
5,800
-3,700
| -39% | -$262K |
|
|
MSTZ
3637
T-Rex 2X Inverse MSTR Daily Target ETF
MSTZ
$97.9M
| $439K | ﹤0.01% |
105,158
+104,465
| +15,074% | +$655K |
|
3638
Ingersoll Rand
IR
$33.9B
| $438K | ﹤0.01% |
+5,268
| New | +$415K |
|
|
LAC
3639
PUT
Lithium Americas
LAC
$986M
| $437K | ﹤0.01% |
163,100
-62,100
| -28% | -$172K |
|
3640
CALL
Satellogic
SATL
$517M
| $437K | ﹤0.01% |
120,900
-91,300
| -43% | -$344K |
|
3641
CALL
Krispy Kreme
DNUT
$564M
| $436K | ﹤0.01% |
150,100
+59,500
| +66% | +$208K |
|
3642
PUT
NovoCure
NVCR
$1.93B
| $436K | ﹤0.01% |
24,500
+16,300
| +199% | +$284K |
|
|
DAY
3643
DELISTED
Dayforce
DAY
| $436K | ﹤0.01% |
7,877
+5,264
| +201% | +$301K |
|
3644
CALL
NOV
NOV
$7.17B
| $435K | ﹤0.01% |
35,000
-36,100
| -51% | -$455K |
|
|
CGC
3645
PUT
Canopy Growth
CGC
$381M
| $434K | ﹤0.01% |
356,300
+118,400
| +50% | +$157K |
|
3646
CALL
AGCO
AGCO
$8.91B
| $433K | ﹤0.01% |
4,200
-400
| -9% | -$38.1K |
|
3647
AeroVironment
AVAV
$7.79B
| $433K | ﹤0.01% |
1,522
-7,542
| -83% | -$1.28M |
|
3648
B&G Foods
BGS
$299M
| $433K | ﹤0.01% |
102,546
+68,485
| +201% | +$358K |
|
3649
Cimpress
CMPR
$2.41B
| $433K | ﹤0.01% |
9,229
-2,456
| -21% | -$107K |
|
|
KREF
3650
PUT
KKR Real Estate Finance Trust
KREF
$475M
| $433K | ﹤0.01% |
49,400
+1,600
| +3% | +$14.7K |
|
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.