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 | |
|---|---|---|---|---|---|---|
2676
PUT
Citizens
CIA
$245M
| $1.11M | ﹤0.01% |
317,500
+183,000
| +136% | +$715K |
|
2677
CALL
Global Ship Lease
GSL
$1.57B
| $1.11M | ﹤0.01% |
42,100
+19,700
| +88% | +$461K |
|
|
JKS
2678
PUT
JinkoSolar
JKS
$775M
| $1.11M | ﹤0.01% |
52,200
+24,000
| +85% | +$436K |
|
2679
CALL
Sociedad Química y Minera de Chile
SQM
$19.6B
| $1.11M | ﹤0.01% |
31,400
-6,500
| -17% | -$222K |
|
|
NLOP
2680
CALL
Net Lease Office Properties
NLOP
$168M
| $1.11M | ﹤0.01% |
34,000
+6,400
| +23% | +$196K |
|
2681
PUT
Royalty Pharma
RPRX
$26.1B
| $1.11M | ﹤0.01% |
30,700
+8,800
| +40% | +$292K |
|
2682
PUT
M&T Bank
MTB
$36.2B
| $1.1M | ﹤0.01% |
5,700
-100
| -2% | -$17.6K |
|
2683
PUT
EyePoint Inc
EYPT
$1.02B
| $1.1M | ﹤0.01% |
117,400
+81,600
| +228% | +$564K |
|
2684
Clover Health Investments
CLOV
$2.28B
| $1.1M | ﹤0.01% |
395,421
+256,420
| +184% | +$843K |
|
2685
Galicia Financial Group
GGAL
$7.92B
| $1.1M | ﹤0.01% |
21,896
-60
| -0.3% | -$3.44K |
|
2686
CALL
Modine Manufacturing
MOD
$12.8B
| $1.1M | ﹤0.01% |
11,200
-13,500
| -55% | -$1.2M |
|
2687
PUT
Tenaris
TS
$29.1B
| $1.1M | ﹤0.01% |
29,500
-2,700
| -8% | -$92.6K |
|
2688
CALL
CVR Partners
UAN
$1.3B
| $1.1M | ﹤0.01% |
12,400
+11,900
| +2,380% | +$958K |
|
|
SMLR
2689
PUT
DELISTED
Semler Scientific
SMLR
| $1.1M | ﹤0.01% |
28,400
+11,700
| +70% | +$417K |
|
2690
PUT
Western Alliance Bancorporation
WAL
$9.07B
| $1.1M | ﹤0.01% |
14,100
-23,500
| -63% | -$1.69M |
|
2691
PUT
ADMA Biologics
ADMA
$1.92B
| $1.1M | ﹤0.01% |
60,300
+3,600
| +6% | +$73.4K |
|
2692
CALL
Hallador Energy
HNRG
$718M
| $1.1M | ﹤0.01% |
69,400
+26,900
| +63% | +$416K |
|
2693
Manchester United
MANU
$3.91B
| $1.1M | ﹤0.01% |
61,697
+18,954
| +44% | +$281K |
|
2694
CALL
Sportradar
SRAD
$4.23B
| $1.1M | ﹤0.01% |
39,100
+15,200
| +64% | +$361K |
|
2695
PUT
Similarweb
SMWB
$551M
| $1.09M | ﹤0.01% |
139,700
+38,000
| +37% | +$285K |
|
2696
PUT
Textron
TXT
$16.6B
| $1.09M | ﹤0.01% |
13,600
-500
| -4% | -$36.2K |
|
2697
PUT
Healthcare Realty
HR
$7.42B
| $1.09M | ﹤0.01% |
68,600
+66,000
| +2,538% | +$1M |
|
2698
CALL
Western Midstream Partners
WES
$19.6B
| $1.09M | ﹤0.01% |
28,100
-30,300
| -52% | -$1.15M |
|
2699
PUT
Corebridge Financial
CRBG
$14.1B
| $1.08M | ﹤0.01% |
30,500
-59,400
| -66% | -$1.85M |
|
2700
CALL
Vaxcyte
PCVX
$7.89B
| $1.08M | ﹤0.01% |
33,300
+8,600
| +35% | +$282K |
|
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.