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 | |
|---|---|---|---|---|---|---|
3926
iShares MSCI World ETF
URTH
$7.93B
| $338K | ﹤0.01% |
+1,997
| New | +$315K |
|
3927
CALL
Arteris
AIP
$1.34B
| $337K | ﹤0.01% |
35,400
+33,400
| +1,670% | +$246K |
|
3928
American Superconductor
AMSC
$1.39B
| $337K | ﹤0.01% |
9,197
-4,311
| -32% | -$106K |
|
3929
Globus Medical
GMED
$10.9B
| $337K | ﹤0.01% |
+5,720
| New | +$370K |
|
3930
CALL
LSB Industries
LXU
$822M
| $337K | ﹤0.01% |
43,300
+30,100
| +228% | +$206K |
|
3931
CALL
Pembina Pipeline
PBA
$29B
| $337K | ﹤0.01% |
9,000
-22,800
| -72% | -$861K |
|
|
LNW
3932
CALL
DELISTED
Light & Wonder
LNW
| $336K | ﹤0.01% |
3,500
+2,100
| +150% | +$180K |
|
3933
PUT
Credicorp
BAP
$30.9B
| $335K | ﹤0.01% |
1,500
+800
| +114% | +$162K |
|
3934
PUT
VanEck Energy Income ETF
EINC
$77.3M
| $335K | ﹤0.01% |
19,100
+18,800
| +6,267% | +$1.79M |
|
3935
PUT
MINISO
MNSO
$3.73B
| $335K | ﹤0.01% |
18,400
-50,000
| -73% | -$898K |
|
3936
SGHC Ltd
SGHC
$7.62B
| $335K | ﹤0.01% |
30,610
+22,332
| +270% | +$189K |
|
3937
CALL
Liberty Media Series A
FWONA
$23.3B
| $334K | ﹤0.01% |
3,200
-1,200
| -27% | -$101K |
|
3938
PUT
Liberty Energy
LBRT
$2.89B
| $334K | ﹤0.01% |
29,100
+24,800
| +577% | +$300K |
|
3939
PUT
Procept Biorobotics
PRCT
$1.03B
| $334K | ﹤0.01% |
5,800
+3,100
| +115% | +$175K |
|
3940
Unusual Machines
UMAC
$952M
| $334K | ﹤0.01% |
+38,975
| New | +$246K |
|
|
NMAX
3941
Newsmax Inc
NMAX
$1.03B
| $334K | ﹤0.01% |
+22,083
| New | +$579K |
|
|
ODVWW
3942
CALL
DELISTED
Osisko Development Corp. Warrant
ODVWW
| $334K | ﹤0.01% |
156,400
+125,600
| +408% | +$268K |
|
3943
Logitech
LOGI
$16B
| $333K | ﹤0.01% |
+3,698
| New | +$300K |
|
|
FLNA
3944
CALL
Filana Therapeutics
FLNA
$42.7M
| $333K | ﹤0.01% |
184,000
-36,100
| -16% | -$64.2K |
|
3945
PUT
Valley National Bancorp
VLY
$8.01B
| $333K | ﹤0.01% |
37,300
-17,000
| -31% | -$148K |
|
3946
CALL
Yext
YEXT
$564M
| $333K | ﹤0.01% |
39,200
+5,400
| +16% | +$37.9K |
|
3947
Roundhill S&P 500 0DTE Covered Call Strategy ETF
XDTE
$338M
| $333K | ﹤0.01% |
7,555
+7,454
| +7,380% | +$317K |
|
|
BASE
3948
DELISTED
Couchbase
BASE
| $332K | ﹤0.01% |
13,632
-15,157
| -53% | -$276K |
|
3949
Fidus Investment
FDUS
$766M
| $332K | ﹤0.01% |
+16,458
| New | +$321K |
|
3950
CALL
Federal Realty Investment Trust
FRT
$10.9B
| $332K | ﹤0.01% |
3,500
-4,900
| -58% | -$463K |
|
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.