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 | |
|---|---|---|---|---|---|---|
526
CALL
Valero Energy
VLO
$92.3B
| $21.9M | 0.01% |
163,000
+40,000
| +33% | +$4.98M |
|
527
CALL
Tapestry
TPR
$29B
| $21.8M | 0.01% |
248,300
-112,500
| -31% | -$8.52M |
|
528
CALL
British American Tobacco
BTI
$134B
| $21.8M | 0.01% |
459,900
+1,700
| +0.4% | +$75.3K |
|
529
CALL
DuPont de Nemours
DD
$18.9B
| $21.7M | 0.01% |
252,623
+21,988
| +10% | +$1.83M |
|
530
PUT
On Holding
ONON
$12.2B
| $21.7M | 0.01% |
416,500
+148,500
| +55% | +$7.57M |
|
531
CALL
Fortinet
FTNT
$114B
| $21.7M | 0.01% |
205,000
-41,600
| -17% | -$4.2M |
|
532
CALL
Cadence Design Systems
CDNS
$93B
| $21.6M | 0.01% |
70,000
+2,600
| +4% | +$756K |
|
533
PUT
Oscar Health
OSCR
$8.89B
| $21.5M | 0.01% |
1,001,900
+877,900
| +708% | +$13.1M |
|
534
CALL
Dollar General
DG
$26.5B
| $21.4M | 0.01% |
187,000
-56,400
| -23% | -$5.6M |
|
535
CALL
Seagate
STX
$205B
| $21.4M | 0.01% |
148,000
-133,300
| -47% | -$13.8M |
|
536
PUT
Global Payments
GPN
$21.6B
| $21.3M | 0.01% |
266,400
+90,600
| +52% | +$7.17M |
|
537
Wells Fargo
WFC
$262B
| $21.3M | 0.01% |
265,915
+38,763
| +17% | +$2.79M |
|
538
PUT
Western Digital
WDC
$192B
| $21.3M | 0.01% |
474,900
-175,800
| -27% | -$8.37M |
|
539
CALL
e.l.f. Beauty
ELF
$4.66B
| $21.2M | 0.01% |
170,400
-28,700
| -14% | -$2.45M |
|
540
CALL
Electronic Arts
EA
$52.4B
| $21.2M | 0.01% |
132,700
-150,800
| -53% | -$22.3M |
|
541
CALL
3M
MMM
$89.1B
| $21.1M | 0.01% |
263,300
-461,600
| -64% | -$66M |
|
542
PUT
NRG Energy
NRG
$29.5B
| $21.1M | 0.01% |
131,200
-155,200
| -54% | -$20.5M |
|
|
NVO
543
Novo Nordisk
NVO
$213B
| $21.1M | 0.01% |
305,237
+66,227
| +28% | +$4.5M |
|
544
CALL
Constellation Brands
STZ
$22.6B
| $21.1M | 0.01% |
129,500
-119,400
| -48% | -$21.4M |
|
|
B
545
Barrick Mining
B
$62.8B
| $21M | 0.01% |
1,011,038
-224,616
| -18% | -$4.39M |
|
546
PUT
Halliburton
HAL
$27.6B
| $21M | 0.01% |
1,031,000
+322,800
| +46% | +$6.77M |
|
547
CALL
Teck Resources
TECK
$28B
| $21M | 0.01% |
520,300
-17,500
| -3% | -$632K |
|
548
CALL
Roku
ROKU
$21.2B
| $21M | 0.01% |
238,500
-23,300
| -9% | -$1.63M |
|
549
PUT
Johnson Controls International
JCI
$86.9B
| $20.8M | 0.01% |
197,300
+127,300
| +182% | +$11.7M |
|
550
PUT
Mondelez International
MDLZ
$78.1B
| $20.8M | 0.01% |
307,700
+79,300
| +35% | +$5.29M |
|
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.