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 | |
|---|---|---|---|---|---|---|
6076
Papa John's
PZZA
$1.01B
| $43K | ﹤0.01% |
896
-13,312
| -94% | -$543K |
|
6077
Simmons First National
SFNC
$3.39B
| $43K | ﹤0.01% |
2,314
+1,796
| +347% | +$33.8K |
|
6078
CALL
Solid Power
SLDP
$450M
| $43K | ﹤0.01% |
20,000
-8,700
| -30% | -$12.2K |
|
6079
PUT
Sprout Social
SPT
$530M
| $43K | ﹤0.01% |
2,100
-1,900
| -48% | -$40.3K |
|
6080
PUT
STAAR Surgical
STAA
$1.19B
| $43K | ﹤0.01% |
2,600
-7,400
| -74% | -$130K |
|
6081
CALL
BlackRock TCP Capital
TCPC
$278M
| $43K | ﹤0.01% |
5,700
+2,200
| +63% | +$16.2K |
|
6082
TTEC Holdings
TTEC
$124M
| $43K | ﹤0.01% |
9,104
-3,864
| -30% | -$17.7K |
|
6083
PUT
US Commodity Index
USCI
$370M
| $43K | ﹤0.01% |
+600
| New | +$42.6K |
|
6084
PUT
Marriott Vacations Worldwide
VAC
$3.53B
| $43K | ﹤0.01% |
600
-1,400
| -70% | -$88.3K |
|
|
YMAB
6085
CALL
DELISTED
Y-mAbs Therapeutics
YMAB
| $43K | ﹤0.01% |
+9,600
| New | +$43.1K |
|
|
BTCL
6086
CALL
T-Rex 2X Long Bitcoin Daily Target ETF
BTCL
$22.2M
| $43K | ﹤0.01% |
900
-2,200
| -71% | -$103K |
|
|
HIMZ
6087
Defiance Daily Target 2X Long HIMS ETF
HIMZ
$49.7M
| $43K | ﹤0.01% |
+143
| New | +$56.9K |
|
6088
Abeona Therapeutics
ABEO
$355M
| $42K | ﹤0.01% |
+7,451
| New | +$42.4K |
|
6089
CALL
Arbutus Biopharma
ABUS
$847M
| $42K | ﹤0.01% |
13,600
+5,900
| +77% | +$19.6K |
|
6090
PUT
Carter's
CRI
$1.43B
| $42K | ﹤0.01% |
1,400
-2,600
| -65% | -$88.1K |
|
|
CSR
6091
PUT
Centerspace
CSR
$952M
| $42K | ﹤0.01% |
+700
| New | +$42.9K |
|
6092
Dine Brands
DIN
$462M
| $42K | ﹤0.01% |
1,731
-8,661
| -83% | -$200K |
|
6093
PUT
iShares Core Dividend ETF
DIVB
$1.71B
| $42K | ﹤0.01% |
1,000
+700
| +233% | +$33.3K |
|
6094
CALL
Digimarc Corp
DMRC
$143M
| $42K | ﹤0.01% |
3,200
-600
| -16% | -$7.7K |
|
6095
Fate Therapeutics
FATE
$275M
| $42K | ﹤0.01% |
38,019
+23,639
| +164% | +$27.5K |
|
|
FBRT
6096
Franklin BSP Realty Trust
FBRT
$580M
| $42K | ﹤0.01% |
+3,992
| New | +$44.8K |
|
6097
PUT
CapForce IBD 50 ETF
FFTY
$78.8M
| $42K | ﹤0.01% |
1,300
-4,000
| -75% | -$114K |
|
6098
PUT
Gaming and Leisure Properties
GLPI
$13B
| $42K | ﹤0.01% |
900
-1,300
| -59% | -$61.4K |
|
6099
CALL
Goldgroup Mining Inc.
GORO
$155M
| $42K | ﹤0.01% |
69,300
+33,300
| +93% | +$18.1K |
|
|
GPMT
6100
CALL
Granite Point Mortgage Trust
GPMT
$63.7M
| $42K | ﹤0.01% |
17,300
+15,100
| +686% | +$33.9K |
|
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.