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 | |
|---|---|---|---|---|---|---|
3751
CALL
Immatics
IMTX
$1.19B
| $400K | ﹤0.01% |
74,500
-12,300
| -14% | -$61K |
|
3752
CALL
Boston Beer
SAM
$1.93B
| $400K | ﹤0.01% |
2,100
-2,400
| -53% | -$552K |
|
3753
Atmos Energy
ATO
$29.9B
| $399K | ﹤0.01% |
2,590
-3,725
| -59% | -$579K |
|
3754
CALL
MaxLinear
MXL
$5.35B
| $399K | ﹤0.01% |
28,100
-32,600
| -54% | -$376K |
|
3755
Chemours
CC
$2.57B
| $398K | ﹤0.01% |
34,843
+20,834
| +149% | +$235K |
|
3756
Direxion Daily Aerospace & Defense Bull 3X ETF
DFEN
$413M
| $398K | ﹤0.01% |
+7,678
| New | +$283K |
|
3757
PUT
Kaspi.kz JSC
KSPI
$16.5B
| $398K | ﹤0.01% |
4,700
+4,400
| +1,467% | +$375K |
|
3758
Madison Square Garden
MSGS
$9.58B
| $398K | ﹤0.01% |
1,906
+1,851
| +3,365% | +$357K |
|
3759
PUT
Trupanion
TRUP
$1.11B
| $398K | ﹤0.01% |
7,200
-20,700
| -74% | -$917K |
|
3760
PUT
Biohaven
BHVN
$2.07B
| $397K | ﹤0.01% |
28,200
+15,100
| +115% | +$269K |
|
3761
CoreCivic
CXW
$3.03B
| $396K | ﹤0.01% |
+18,808
| New | +$406K |
|
3762
CALL
Inovio Pharmaceuticals
INO
$84.7M
| $396K | ﹤0.01% |
194,600
+175,800
| +935% | +$337K |
|
3763
Xerox
XRX
$360M
| $396K | ﹤0.01% |
75,276
+36,719
| +95% | +$179K |
|
|
JBTM
3764
CALL
JBT Marel
JBTM
$7.59B
| $396K | ﹤0.01% |
3,300
+200
| +6% | +$22.3K |
|
3765
CALL
Equinox Gold
EQX
$7.22B
| $395K | ﹤0.01% |
68,800
-89,600
| -57% | -$582K |
|
|
HIVE
3766
HIVE Digital Technologies
HIVE
$760M
| $395K | ﹤0.01% |
219,772
+88,631
| +68% | +$156K |
|
3767
PUT
Atomera
ATOM
$187M
| $394K | ﹤0.01% |
78,200
+42,600
| +120% | +$227K |
|
|
EXAS
3768
DELISTED
Exact Sciences
EXAS
| $394K | ﹤0.01% |
+7,427
| New | +$377K |
|
|
CRESY
3769
PUT
Cresud
CRESY
$808M
| $393K | ﹤0.01% |
36,910
+1,614
| +5% | +$18K |
|
3770
Sharplink Inc
SBET
$1.35B
| $393K | ﹤0.01% |
+39,608
| New | +$537K |
|
3771
PUT
Global Ship Lease
GSL
$1.57B
| $392K | ﹤0.01% |
14,900
-3,300
| -18% | -$77.2K |
|
3772
PUT
SM Energy
SM
$7.11B
| $392K | ﹤0.01% |
15,900
-4,300
| -21% | -$104K |
|
|
VTEL
3773
PUT
Vanguard Long-Term Tax-Exempt Bond ETF
VTEL
$282M
| $392K | ﹤0.01% |
+8,000
| New | +$798K |
|
3774
iShares MSCI Chile ETF
ECH
$1B
| $391K | ﹤0.01% |
12,441
+12,294
| +8,363% | +$382K |
|
3775
PUT
Denison Mines
DNN
$2.49B
| $390K | ﹤0.01% |
214,300
+58,200
| +37% | +$88.2K |
|
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.