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 | |
|---|---|---|---|---|---|---|
5176
Gerdau
GGB
$9.74B
| $106K | ﹤0.01% |
36,478
-6,190
| -15% | -$17K |
|
5177
CALL
nLIGHT
LASR
$3.71B
| $106K | ﹤0.01% |
5,400
-7,100
| -57% | -$88.2K |
|
5178
PUT
Marqeta
MQ
$1.86B
| $106K | ﹤0.01% |
4,575
+750
| +20% | +$14.2K |
|
5179
PUT
O-I Glass
OI
$1.13B
| $106K | ﹤0.01% |
7,200
-27,200
| -79% | -$348K |
|
5180
CALL
Phinia Inc
PHIN
$2.7B
| $106K | ﹤0.01% |
2,400
-2,900
| -55% | -$122K |
|
5181
Tiziana Life Sciences
TLSA
$123M
| $106K | ﹤0.01% |
+67,251
| New | +$89.9K |
|
5182
CALL
TTEC Holdings
TTEC
$126M
| $106K | ﹤0.01% |
+22,200
| New | +$102K |
|
5183
CALL
CareCloud
CCLD
$102M
| $105K | ﹤0.01% |
44,500
+43,000
| +2,867% | +$81.7K |
|
5184
PUT
Evolus
EOLS
$396M
| $105K | ﹤0.01% |
11,500
+5,200
| +83% | +$53.2K |
|
5185
PUT
Geospace Technologies
GEOS
$93.1M
| $105K | ﹤0.01% |
+7,400
| New | +$55.2K |
|
5186
CALL
Herc Holdings
HRI
$4.88B
| $105K | ﹤0.01% |
800
-9,500
| -92% | -$1.15M |
|
|
NSA
5187
PUT
DELISTED
National Storage Affiliates Trust
NSA
| $105K | ﹤0.01% |
3,300
+2,300
| +230% | +$80.3K |
|
|
OLO
5188
CALL
DELISTED
Olo Inc
OLO
| $105K | ﹤0.01% |
+11,900
| New | +$92.3K |
|
5189
CALL
Prime Medicine
PRME
$545M
| $105K | ﹤0.01% |
42,900
+24,600
| +134% | +$37.9K |
|
5190
CALL
Radiant Logistics
RLGT
$388M
| $105K | ﹤0.01% |
+17,300
| New | +$104K |
|
5191
Seanergy Maritime Holdings
SHIP
$386M
| $105K | ﹤0.01% |
16,700
-11,189
| -40% | -$67.4K |
|
5192
PUT
SELLAS Life Sciences
SLS
$2.02B
| $105K | ﹤0.01% |
+48,300
| New | +$74.1K |
|
5193
CALL
Vir Biotechnology
VIR
$1.5B
| $105K | ﹤0.01% |
20,900
+7,100
| +51% | +$38.1K |
|
5194
PUT
Amplitude
AMPL
$1.14B
| $104K | ﹤0.01% |
8,400
-1,800
| -18% | -$19.5K |
|
5195
PUT
Bloomin' Brands
BLMN
$759M
| $104K | ﹤0.01% |
12,100
+8,800
| +267% | +$70.7K |
|
5196
Fabrinet
FN
$15.7B
| $104K | ﹤0.01% |
356
-3,486
| -91% | -$777K |
|
5197
CALL
Mohawk Industries
MHK
$7.29B
| $104K | ﹤0.01% |
1,000
+600
| +150% | +$62.6K |
|
5198
Radware
RDWR
$1.05B
| $104K | ﹤0.01% |
3,562
+604
| +20% | +$14.3K |
|
|
RDNW
5199
CALL
RideNow Group
RDNW
$248M
| $104K | ﹤0.01% |
45,400
+44,200
| +3,683% | +$99.3K |
|
|
SHOE
5200
PUT
Shoe Station Group
SHOE
$420M
| $104K | ﹤0.01% |
5,600
+5,000
| +833% | +$95.1K |
|
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.