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 | |
|---|---|---|---|---|---|---|
2626
Grupo Cibest SA
CIB
$20.4B
| $1.17M | ﹤0.01% |
25,249
+118
| +0.5% | +$4.91K |
|
2627
Banco Santander
SAN
$194B
| $1.17M | ﹤0.01% |
140,540
+94,222
| +203% | +$701K |
|
|
VTLE
2628
PUT
DELISTED
Vital Energy
VTLE
| $1.17M | ﹤0.01% |
72,500
+10,500
| +17% | +$172K |
|
2629
PUT
Banco Bradesco
BBD
$38.1B
| $1.17M | ﹤0.01% |
377,100
+93,900
| +33% | +$247K |
|
2630
PUT
Intellia Therapeutics
NTLA
$1.5B
| $1.16M | ﹤0.01% |
123,900
-39,300
| -24% | -$323K |
|
2631
PUT
Vanguard FTSE Developed Markets ETF
VEA
$226B
| $1.16M | ﹤0.01% |
20,300
-2,300
| -10% | -$123K |
|
2632
PUT
Vanda Pharmaceuticals
VNDA
$312M
| $1.15M | ﹤0.01% |
244,500
+134,200
| +122% | +$587K |
|
|
ARR
2633
PUT
Armour Residential REIT
ARR
$2.02B
| $1.15M | ﹤0.01% |
68,600
-5,700
| -8% | -$91.5K |
|
2634
CALL
Savers
SVV
$1.4B
| $1.15M | ﹤0.01% |
113,100
+111,300
| +6,183% | +$1.09M |
|
2635
PUT
Immersion
IMMR
$216M
| $1.15M | ﹤0.01% |
146,200
+20,300
| +16% | +$151K |
|
2636
D-Wave Quantum
QBTS
$6B
| $1.15M | ﹤0.01% |
+78,745
| New | +$926K |
|
2637
CALL
Fastly Inc
FSLY
$3.17B
| $1.15M | ﹤0.01% |
163,100
-21,300
| -12% | -$143K |
|
|
NVMI
2638
Nova
NVMI
$13.9B
| $1.15M | ﹤0.01% |
4,169
-2,960
| -42% | -$602K |
|
2639
SLM Corp
SLM
$4.57B
| $1.15M | ﹤0.01% |
+34,950
| New | +$1.07M |
|
2640
CALL
Corsair Gaming
CRSR
$1.05B
| $1.15M | ﹤0.01% |
121,500
-157,000
| -56% | -$1.27M |
|
|
SRTA
2641
PUT
Strata Critical Medical Inc
SRTA
$436M
| $1.14M | ﹤0.01% |
283,000
+260,300
| +1,147% | +$847K |
|
2642
PUT
BlackBerry
BB
$5.01B
| $1.14M | ﹤0.01% |
248,700
-31,900
| -11% | -$120K |
|
2643
CALL
Sensata Technologies
ST
$6.65B
| $1.14M | ﹤0.01% |
37,800
+30,200
| +397% | +$741K |
|
2644
PUT
BBVA Argentina
BBAR
$3.85B
| $1.14M | ﹤0.01% |
69,100
+4,800
| +7% | +$91.7K |
|
2645
CALL
Charles River Laboratories
CRL
$10.9B
| $1.14M | ﹤0.01% |
7,500
+3,600
| +92% | +$480K |
|
2646
PUT
Mattel
MAT
$4.17B
| $1.14M | ﹤0.01% |
57,700
+36,000
| +166% | +$641K |
|
2647
LyondellBasell Industries
LYB
$19.5B
| $1.14M | ﹤0.01% |
19,645
-7,556
| -28% | -$440K |
|
2648
CALL
Prothena Corp
PRTA
$458M
| $1.14M | ﹤0.01% |
187,200
+170,100
| +995% | +$1.28M |
|
2649
CALL
Liberty Energy
LBRT
$2.83B
| $1.13M | ﹤0.01% |
98,800
+5,800
| +6% | +$70.2K |
|
2650
CALL
Elanco Animal Health
ELAN
$12.4B
| $1.13M | ﹤0.01% |
79,400
-99,000
| -55% | -$1.16M |
|
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.