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 | |
|---|---|---|---|---|---|---|
6901
PUT
Geron
GERN
$930M
| $17K | ﹤0.01% |
12,600
-20,200
| -62% | -$28.6K |
|
6902
CALL
IDEX
IEX
$16.6B
| $17K | ﹤0.01% |
100
| – | – |
|
6903
International Money Express
IMXI
$398M
| $17K | ﹤0.01% |
+1,766
| New | +$20.2K |
|
6904
ARK Israel Innovative Technology ETF
IZRL
$140M
| $17K | ﹤0.01% |
626
-590
| -49% | -$13.8K |
|
|
JBGS
6905
CALL
JBG SMITH
JBGS
$837M
| $17K | ﹤0.01% |
1,000
+900
| +900% | +$14.7K |
|
6906
PUT
Kinetik
KNTK
$3.64B
| $17K | ﹤0.01% |
400
-1,300
| -76% | -$57.1K |
|
|
LSEA
6907
CALL
DELISTED
Landsea Homes
LSEA
| $17K | ﹤0.01% |
8,100
-1,200
| -13% | -$10.4K |
|
|
MVO
6908
MV Oil Trust
MVO
| $17K | ﹤0.01% |
+3,083
| New | +$17.9K |
|
|
NREF
6909
CALL
NexPoint Real Estate Finance
NREF
$323M
| $17K | ﹤0.01% |
1,300
+700
| +117% | +$10K |
|
6910
PUT
NRX Pharmaceuticals
NRXP
$152M
| $17K | ﹤0.01% |
5,500
+4,900
| +817% | +$12.3K |
|
6911
PUT
Origin Bancorp
OBK
$1.7B
| $17K | ﹤0.01% |
+500
| New | +$16.6K |
|
|
OLPX
6912
DELISTED
Olaplex Holdings
OLPX
| $17K | ﹤0.01% |
12,592
+97
| +0.8% | +$126 |
|
|
OTLY
6913
Oatly Group
OTLY
$473M
| $17K | ﹤0.01% |
+1,479
| New | +$15.6K |
|
6914
PUT
PTC
PTC
$14.7B
| $17K | ﹤0.01% |
100
-22,100
| -100% | -$3.56M |
|
|
RDUS
6915
CALL
DELISTED
Radius Recycling
RDUS
| $17K | ﹤0.01% |
9,200
-14,300
| -61% | -$420K |
|
6916
Reynolds Consumer Products
REYN
$5.44B
| $17K | ﹤0.01% |
+833
| New | +$18.9K |
|
6917
iShares Residential and Multisector Real Estate ETF
REZ
$906M
| $17K | ﹤0.01% |
+218
| New | +$18K |
|
|
SA
6918
Seabridge Gold
SA
$2.69B
| $17K | ﹤0.01% |
1,222
-44,343
| -97% | -$564K |
|
6919
CALL
SEI Investments
SEIC
$12.4B
| $17K | ﹤0.01% |
200
-3,200
| -94% | -$258K |
|
6920
PUT
E.W. Scripps
SSP
$282M
| $17K | ﹤0.01% |
6,100
-9,600
| -61% | -$23.2K |
|
6921
Star Holdings Shares of Beneficial Interest
STHO
$114M
| $17K | ﹤0.01% |
2,296
+2,102
| +1,084% | +$14.5K |
|
|
SUPV
6922
Grupo Supervielle
SUPV
$842M
| $17K | ﹤0.01% |
1,675
-9,564
| -85% | -$130K |
|
6923
Telecom Argentina
TEO
$5.86B
| $17K | ﹤0.01% |
1,970
+670
| +52% | +$6.71K |
|
|
TUYA
6924
PUT
Tuya Inc
TUYA
$1.02B
| $17K | ﹤0.01% |
7,600
-63,700
| -89% | -$155K |
|
6925
Worthington Steel
WS
$1.9B
| $17K | ﹤0.01% |
578
-396
| -41% | -$10.2K |
|
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.