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 | |
|---|---|---|---|---|---|---|
751
CALL
Grab
GRAB
$13.7B
| $12.6M | 0.01% |
2,514,100
+820,800
| +48% | +$3.83M |
|
752
CALL
Snap
SNAP
$7.52B
| $12.6M | 0.01% |
1,454,400
-1,073,700
| -42% | -$8.91M |
|
753
CALL
KLA
KLAC
$280B
| $12.6M | 0.01% |
141,000
+23,000
| +19% | +$1.73M |
|
754
CALL
Southern Company
SO
$108B
| $12.6M | 0.01% |
137,500
-116,400
| -46% | -$10.5M |
|
755
CALL
BridgeBio Pharma
BBIO
$16.2B
| $12.6M | 0.01% |
291,000
-15,300
| -5% | -$556K |
|
756
iShares US Home Construction ETF
ITB
$2.37B
| $12.6M | 0.01% |
+134,719
| New | +$12.3M |
|
757
CALL
NXP Semiconductors
NXPI
$70.4B
| $12.5M | 0.01% |
57,100
+600
| +1% | +$117K |
|
758
PepsiCo
PEP
$185B
| $12.5M | 0.01% |
+94,468
| New | +$12.7M |
|
|
759
PUT
Snap
SNAP
$7.52B
| $12.4M | 0.01% |
1,432,200
-541,300
| -27% | -$4.49M |
|
760
CALL
S&P Global
SPGI
$127B
| $12.3M | 0.01% |
23,400
-10,300
| -31% | -$5.14M |
|
761
CALL
Edison International
EIX
$30.9B
| $12.3M | 0.01% |
239,000
-326,400
| -58% | -$17.9M |
|
762
PUT
ProShares Ultra Bloomberg Natural Gas
BOIL
$422M
| $12.3M | 0.01% |
268,450
-50,400
| -16% | -$5.84M |
|
763
CALL
Phillips 66
PSX
$84.8B
| $12.3M | 0.01% |
103,100
+38,900
| +61% | +$4.36M |
|
764
CALL
Bloom Energy
BE
$62.1B
| $12.3M | 0.01% |
513,200
-51,700
| -9% | -$1M |
|
765
CALL
American Electric Power
AEP
$72.4B
| $12.3M | 0.01% |
118,300
+21,100
| +22% | +$2.2M |
|
766
CALL
Grayscale Bitcoin Trust
GBTC
$9.91B
| $12.3M | 0.01% |
144,600
+35,300
| +32% | +$2.74M |
|
767
PUT
TKO Group
TKO
$13.6B
| $12.3M | 0.01% |
67,400
-34,600
| -34% | -$5.56M |
|
768
PUT
Samsara
IOT
$19.4B
| $12.2M | 0.01% |
307,500
+131,800
| +75% | +$5.45M |
|
769
CALL
Norwegian Cruise Line
NCLH
$8.87B
| $12.2M | 0.01% |
603,200
-194,000
| -24% | -$3.47M |
|
770
CALL
GE HealthCare
GEHC
$27.9B
| $12.2M | 0.01% |
164,900
+8,900
| +6% | +$620K |
|
771
PUT
Allstate
ALL
$64.8B
| $12.2M | 0.01% |
60,600
-1,300
| -2% | -$259K |
|
772
PUT
Teradyne
TER
$57.8B
| $12.2M | 0.01% |
135,500
-9,700
| -7% | -$775K |
|
773
PUT
HP
HPQ
$23B
| $12.2M | 0.01% |
496,900
+192,300
| +63% | +$4.9M |
|
|
CFLT
774
CALL
DELISTED
Confluent
CFLT
| $12.1M | 0.01% |
486,900
-53,400
| -10% | -$1.2M |
|
775
Rio Tinto
RIO
$150B
| $12.1M | 0.01% |
207,861
+56,675
| +37% | +$3.35M |
|
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.