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 | |
|---|---|---|---|---|---|---|
2751
Halliburton
HAL
$27.9B
| $1.02M | ﹤0.01% |
50,227
-38,252
| -43% | -$802K |
|
2752
CALL
Glaukos
GKOS
$9.02B
| $1.02M | ﹤0.01% |
9,900
+2,700
| +38% | +$253K |
|
2753
PUT
uniQure
QURE
$2.68B
| $1.02M | ﹤0.01% |
73,300
+27,100
| +59% | +$365K |
|
2754
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$162M
| $1.02M | ﹤0.01% |
21,241
+12,860
| +153% | +$757K |
|
2755
CALL
Americold
COLD
$4.09B
| $1.02M | ﹤0.01% |
61,300
+54,900
| +858% | +$995K |
|
2756
Joby Aviation
JOBY
$6.82B
| $1.02M | ﹤0.01% |
96,636
+8,385
| +10% | +$60.7K |
|
2757
PUT
Kosmos Energy
KOS
$1.56B
| $1.02M | ﹤0.01% |
592,600
+24,100
| +4% | +$43.6K |
|
2758
CALL
InMode
INMD
$872M
| $1.02M | ﹤0.01% |
70,500
+38,100
| +118% | +$559K |
|
2759
PUT
Ambev
ABEV
$47.3B
| $1.02M | ﹤0.01% |
422,300
-9,500
| -2% | -$23.1K |
|
2760
PUT
AptarGroup
ATR
$8.45B
| $1.02M | ﹤0.01% |
+6,500
| New | +$982K |
|
2761
PUT
Agilent Technologies
A
$39.1B
| $1.01M | ﹤0.01% |
8,600
-13,900
| -62% | -$1.54M |
|
2762
PUT
Tetra Tech
TTEK
$8.23B
| $1.01M | ﹤0.01% |
28,200
-123,500
| -81% | -$4.11M |
|
2763
PUT
Scholar Rock
SRRK
$5.71B
| $1.01M | ﹤0.01% |
28,600
+12,100
| +73% | +$380K |
|
2764
Tyson Foods
TSN
$20.2B
| $1.01M | ﹤0.01% |
18,032
-57,787
| -76% | -$3.32M |
|
2765
Direxion Daily Gold Miners Index Bull 2X ETF
NUGT
$863M
| $1M | ﹤0.01% |
+13,508
| New | +$940K |
|
|
HAPN
2766
CALL
Happen Inc
HAPN
$2.08B
| $1M | ﹤0.01% |
83,400
-67,000
| -45% | -$696K |
|
2767
CALL
Bio-Techne
TECH
$11.2B
| $1M | ﹤0.01% |
19,500
+17,400
| +829% | +$874K |
|
|
HNGE
2768
CALL
Hinge Health
HNGE
$5.75B
| $1M | ﹤0.01% |
+19,400
| New | +$784K |
|
2769
PUT
Aurinia Pharmaceuticals
AUPH
$1.97B
| $1M | ﹤0.01% |
118,400
+40,600
| +52% | +$325K |
|
2770
CALL
Cheesecake Factory
CAKE
$4.21B
| $1M | ﹤0.01% |
16,000
-7,900
| -33% | -$420K |
|
2771
CALL
Mueller Industries
MLI
$14.1B
| $1M | ﹤0.01% |
25,200
+5,200
| +26% | +$196K |
|
2772
PUT
CRH
CRH
$66.7B
| $1M | ﹤0.01% |
10,900
-3,300
| -23% | -$301K |
|
2773
Labcorp
LH
$24.3B
| $999K | ﹤0.01% |
+3,806
| New | +$927K |
|
2774
PUT
Royal Bank of Canada
RY
$291B
| $999K | ﹤0.01% |
7,600
+3,800
| +100% | +$465K |
|
2775
Axcelis
ACLS
$4.12B
| $998K | ﹤0.01% |
+14,322
| New | +$817K |
|
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.