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 | |
|---|---|---|---|---|---|---|
2726
CALL
Gartner
IT
$9.41B
| $1.05M | ﹤0.01% |
2,600
-8,000
| -75% | -$3.35M |
|
2727
PUT
CACI
CACI
$10.8B
| $1.05M | ﹤0.01% |
2,200
+1,300
| +144% | +$576K |
|
2728
CALL
Itaú Unibanco
ITUB
$91.3B
| $1.05M | ﹤0.01% |
159,032
-39,964
| -20% | -$244K |
|
2729
CALL
Gulfport Energy Corp
GPOR
$2.83B
| $1.05M | ﹤0.01% |
5,200
+1,700
| +49% | +$317K |
|
2730
CALL
Velocity Financial
VEL
$683M
| $1.04M | ﹤0.01% |
56,400
-6,400
| -10% | -$112K |
|
2731
CALL
Phathom Pharmaceuticals
PHAT
$912M
| $1.04M | ﹤0.01% |
108,900
+100,100
| +1,138% | +$554K |
|
2732
XP
XP
$8.62B
| $1.04M | ﹤0.01% |
+51,680
| New | +$893K |
|
2733
CALL
WEC Energy
WEC
$37.7B
| $1.04M | ﹤0.01% |
10,000
-20,500
| -67% | -$2.18M |
|
|
SEPN
2734
PUT
Septerna Inc
SEPN
$1.49B
| $1.04M | ﹤0.01% |
+98,600
| New | +$812K |
|
2735
PUT
Hartford Financial Services
HIG
$38.5B
| $1.04M | ﹤0.01% |
8,200
+7,500
| +1,071% | +$932K |
|
2736
PUT
Skywest
SKYW
$4.11B
| $1.04M | ﹤0.01% |
10,100
-2,800
| -22% | -$266K |
|
|
NNDM
2737
Nano Dimension
NNDM
$309M
| $1.04M | ﹤0.01% |
641,307
-140,271
| -18% | -$215K |
|
2738
ProShares Ultra Semiconductors
USD
$2.64B
| $1.04M | ﹤0.01% |
28,074
+21,538
| +330% | +$539K |
|
2739
CALL
Vipshop
VIPS
$6.84B
| $1.04M | ﹤0.01% |
68,900
+1,700
| +3% | +$24.1K |
|
2740
CALL
Ondas Inc
ONDS
$4.44B
| $1.03M | ﹤0.01% |
539,300
+287,400
| +114% | +$321K |
|
2741
PUT
Arrowhead Research
ARWR
$12.1B
| $1.03M | ﹤0.01% |
65,500
+21,500
| +49% | +$308K |
|
2742
CALL
Danaos Corp
DAC
$2.55B
| $1.03M | ﹤0.01% |
12,000
+11,200
| +1,400% | +$919K |
|
2743
Howard Hughes
HHH
$3.93B
| $1.03M | ﹤0.01% |
15,319
+3,745
| +32% | +$256K |
|
|
BTM
2744
CALL
DELISTED
Bitcoin Depot
BTM
| $1.03M | ﹤0.01% |
+29,100
| New | +$618K |
|
2745
CALL
Rayonier
RYN
$6.49B
| $1.03M | ﹤0.01% |
48,770
+9,964
| +26% | +$227K |
|
|
ITOS
2746
DELISTED
iTeos Therapeutics
ITOS
| $1.03M | ﹤0.01% |
+103,212
| New | +$831K |
|
2747
Kosmos Energy
KOS
$1.56B
| $1.03M | ﹤0.01% |
598,648
+186,967
| +45% | +$339K |
|
2748
PUT
Canadian Solar
CSIQ
$906M
| $1.03M | ﹤0.01% |
93,200
-139,400
| -60% | -$1.35M |
|
|
ARR
2749
CALL
Armour Residential REIT
ARR
$2.02B
| $1.03M | ﹤0.01% |
61,100
-55,200
| -47% | -$886K |
|
2750
PUT
Progress Software
PRGS
$1.55B
| $1.03M | ﹤0.01% |
16,100
+14,900
| +1,242% | +$906K |
|
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.