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 | |
|---|---|---|---|---|---|---|
2526
Magnite
MGNI
$2.65B
| $1.27M | ﹤0.01% |
+52,834
| New | +$778K |
|
2527
United Natural Foods
UNFI
$3.01B
| $1.27M | ﹤0.01% |
+54,526
| New | +$1.42M |
|
2528
CALL
Arcutis Biotherapeutics
ARQT
$3.42B
| $1.27M | ﹤0.01% |
90,600
-5,800
| -6% | -$81.3K |
|
2529
Banc of California
BANC
$3.28B
| $1.27M | ﹤0.01% |
90,416
-92,639
| -51% | -$1.26M |
|
2530
CALL
MSCI
MSCI
$40B
| $1.27M | ﹤0.01% |
2,200
-30,100
| -93% | -$16.7M |
|
2531
PUT
Upwork
UPWK
$1.09B
| $1.27M | ﹤0.01% |
94,400
+17,700
| +23% | +$254K |
|
|
ATYR
2532
CALL
aTyr Pharma
ATYR
$46.4M
| $1.27M | ﹤0.01% |
250,000
+218,500
| +694% | +$860K |
|
2533
Badger Meter
BMI
$3.66B
| $1.27M | ﹤0.01% |
5,169
+4,808
| +1,332% | +$1.09M |
|
|
LINE
2534
Lineage Inc
LINE
$9.43B
| $1.26M | ﹤0.01% |
29,089
+24,373
| +517% | +$1.18M |
|
2535
PUT
First Horizon
FHN
$12.1B
| $1.26M | ﹤0.01% |
59,600
-25,800
| -30% | -$492K |
|
2536
Lemonade
LMND
$4.62B
| $1.26M | ﹤0.01% |
28,824
-7,945
| -22% | -$265K |
|
2537
CALL
Camping World
CWH
$363M
| $1.26M | ﹤0.01% |
73,400
+13,500
| +23% | +$210K |
|
2538
BWX Technologies
BWXT
$16B
| $1.26M | ﹤0.01% |
8,749
-10,774
| -55% | -$1.26M |
|
2539
CALL
OSI Systems
OSIS
$3.57B
| $1.26M | ﹤0.01% |
5,600
-3,700
| -40% | -$790K |
|
2540
CALL
PTC
PTC
$13.7B
| $1.26M | ﹤0.01% |
7,300
-22,700
| -76% | -$3.66M |
|
2541
Goodyear
GT
$2.07B
| $1.26M | ﹤0.01% |
121,152
-55,523
| -31% | -$588K |
|
2542
CALL
Herbalife
HLF
$1.23B
| $1.26M | ﹤0.01% |
145,800
+71,300
| +96% | +$530K |
|
2543
Ovintiv
OVV
$17.5B
| $1.25M | ﹤0.01% |
32,906
+11,171
| +51% | +$410K |
|
2544
CALL
Textron
TXT
$16.6B
| $1.25M | ﹤0.01% |
15,600
+400
| +3% | +$28.9K |
|
2545
CALL
UGI
UGI
$8B
| $1.25M | ﹤0.01% |
34,400
-6,500
| -16% | -$224K |
|
2546
PUT
Coeur Mining
CDE
$15.6B
| $1.25M | ﹤0.01% |
141,200
+75,400
| +115% | +$549K |
|
2547
State Street SPDR EURO STOXX 50 ETF
FEZ
$4.28B
| $1.25M | ﹤0.01% |
+20,941
| New | +$1.2M |
|
2548
Flywire
FLYW
$1.96B
| $1.25M | ﹤0.01% |
106,839
+99,513
| +1,358% | +$1.01M |
|
2549
CALL
Telus
TU
$16B
| $1.25M | ﹤0.01% |
77,700
+61,100
| +368% | +$948K |
|
2550
CALL
New Fortress Energy
NFE
$101M
| $1.25M | ﹤0.01% |
375,600
-17,400
| -4% | -$75.6K |
|
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.