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 | |
|---|---|---|---|---|---|---|
501
CALL
EOG Resources
EOG
$76.7B
| $23.8M | 0.01% |
198,600
-14,200
| -7% | -$1.62M |
|
502
State Street Financial Select Sector SPDR ETF
XLF
$55.3B
| $23.7M | 0.01% |
+453,315
| New | +$22.4M |
|
503
PUT
The Mosaic Company
MOS
$7.24B
| $23.7M | 0.01% |
649,700
+445,700
| +218% | +$14.3M |
|
504
PUT
e.l.f. Beauty
ELF
$4.66B
| $23.6M | 0.01% |
189,300
+17,000
| +10% | +$1.45M |
|
505
CALL
NRG Energy
NRG
$29.5B
| $23.5M | 0.01% |
146,400
+23,800
| +19% | +$3.14M |
|
506
CALL
D-Wave Quantum
QBTS
$6.43B
| $23.5M | 0.01% |
1,604,200
+66,500
| +4% | +$782K |
|
507
CALL
Trump Media & Technology Group
DJT
$2.56B
| $23.3M | 0.01% |
1,290,900
+646,000
| +100% | +$14.1M |
|
508
CALL
Twilio
TWLO
$27.8B
| $23.2M | 0.01% |
186,800
-185,000
| -50% | -$19.7M |
|
509
PUT
Seagate
STX
$205B
| $22.9M | 0.01% |
159,000
-24,000
| -13% | -$2.48M |
|
510
PUT
GraniteShares Bloomberg Commodity Broad Strategy No K-1 ETF
COMB
$135M
| $22.9M | 0.01% |
429,300
-800
| -0.2% | -$16.8K |
|
511
PUT
Rigetti Computing
RGTI
$5.06B
| $22.9M | 0.01% |
1,933,700
+629,100
| +48% | +$6.64M |
|
512
CALL
Ford
F
$57.5B
| $22.9M | 0.01% |
2,110,000
-848,100
| -29% | -$8.64M |
|
513
PUT
Etsy
ETSY
$7.64B
| $22.8M | 0.01% |
455,200
+141,000
| +45% | +$7.01M |
|
514
CALL
Fidelity Wise Origin Bitcoin Fund
FBTC
$12.2B
| $22.8M | 0.01% |
242,900
+109,900
| +83% | +$9.46M |
|
|
515
CALL
Etsy
ETSY
$7.64B
| $22.8M | 0.01% |
453,600
+159,600
| +54% | +$7.94M |
|
516
PUT
Riot Platforms
RIOT
$8.84B
| $22.5M | 0.01% |
1,993,400
+523,400
| +36% | +$4.45M |
|
517
PUT
Energy Transfer Partners
ET
$70.1B
| $22.5M | 0.01% |
1,240,300
-78,400
| -6% | -$1.37M |
|
518
PUT
Abercrombie & Fitch
ANF
$4.27B
| $22.3M | 0.01% |
269,300
-4,000
| -1% | -$303K |
|
519
CALL
Take-Two Interactive
TTWO
$43.4B
| $22.3M | 0.01% |
91,700
-69,800
| -43% | -$15.7M |
|
520
PUT
Expedia Group
EXPE
$31.3B
| $22.2M | 0.01% |
131,900
-25,500
| -16% | -$4.14M |
|
|
SCIU
521
PUT
DELISTED
Global X Scientific Beta US ETF
SCIU
| $22.2M | 0.01% |
558,300
+76,500
| +16% | +$3.04M |
|
522
KraneShares CSI China Internet ETF
KWEB
$5.23B
| $22.2M | 0.01% |
645,901
-4,332
| -0.7% | -$144K |
|
523
PUT
Regeneron Pharmaceuticals
REGN
$68.3B
| $22.1M | 0.01% |
42,000
+16,200
| +63% | +$9.04M |
|
524
PUT
CF Industries
CF
$19.6B
| $22M | 0.01% |
239,500
+26,300
| +12% | +$2.24M |
|
525
CALL
Toast
TOST
$16.9B
| $21.9M | 0.01% |
495,500
-2,900
| -0.6% | -$114K |
|
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.