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 | |
|---|---|---|---|---|---|---|
2801
American Express
AXP
$223B
| $980K | ﹤0.01% |
+3,075
| New | +$865K |
|
2802
PUT
Prothena Corp
PRTA
$458M
| $980K | ﹤0.01% |
161,500
+161,000
| +32,200% | +$1.21M |
|
2803
CALL
Array Technologies
ARRY
$818M
| $979K | ﹤0.01% |
166,100
-13,900
| -8% | -$84.4K |
|
2804
PUT
First Citizens BancShares
FCNCA
$24.6B
| $978K | ﹤0.01% |
500
-500
| -50% | -$907K |
|
2805
PUT
Curtiss-Wright
CW
$27.7B
| $977K | ﹤0.01% |
2,000
+1,700
| +567% | +$671K |
|
2806
PUT
Option Care Health
OPCH
$3.4B
| $977K | ﹤0.01% |
30,100
+24,700
| +457% | +$798K |
|
2807
CALL
Schrodinger
SDGR
$1.12B
| $973K | ﹤0.01% |
48,400
-20,700
| -30% | -$473K |
|
|
OTLY
2808
CALL
Oatly Group
OTLY
$417M
| $972K | ﹤0.01% |
81,900
-75,500
| -48% | -$797K |
|
2809
PUT
Amer Sports
AS
$19.7B
| $972K | ﹤0.01% |
25,100
+1,000
| +4% | +$30.8K |
|
2810
Allegiant Air
ALGT
$2.64B
| $969K | ﹤0.01% |
+17,648
| New | +$910K |
|
2811
CALL
Digital Turbine
APPS
$1.02B
| $969K | ﹤0.01% |
164,300
+9,100
| +6% | +$37.4K |
|
|
APLS
2812
DELISTED
Apellis Pharmaceuticals
APLS
| $968K | ﹤0.01% |
+55,934
| New | +$1.04M |
|
2813
UiPath
PATH
$5.62B
| $968K | ﹤0.01% |
75,673
+25,852
| +52% | +$310K |
|
2814
CALL
Sabre
SABR
$656M
| $967K | ﹤0.01% |
306,200
-43,100
| -12% | -$111K |
|
|
ALMS
2815
PUT
Alumis Inc
ALMS
$3.57B
| $967K | ﹤0.01% |
+322,500
| New | +$1.52M |
|
2816
Cintas
CTAS
$82.4B
| $966K | ﹤0.01% |
4,336
-4,939
| -53% | -$1.06M |
|
|
2817
CALL
Option Care Health
OPCH
$3.4B
| $964K | ﹤0.01% |
29,700
+13,200
| +80% | +$426K |
|
|
DQ
2818
PUT
Daqo New Energy
DQ
$790M
| $963K | ﹤0.01% |
63,500
-31,300
| -33% | -$445K |
|
2819
Uranium Energy
UEC
$4.71B
| $963K | ﹤0.01% |
141,664
+100,184
| +242% | +$561K |
|
2820
Academy Sports + Outdoors
ASO
$2.89B
| $962K | ﹤0.01% |
21,477
+9,216
| +75% | +$382K |
|
2821
Beam Therapeutics
BEAM
$2.58B
| $962K | ﹤0.01% |
56,570
+40,103
| +244% | +$698K |
|
2822
FNB Corp
FNB
$6.78B
| $962K | ﹤0.01% |
65,986
+46,499
| +239% | +$629K |
|
|
MTSR
2823
PUT
DELISTED
Metsera Inc
MTSR
| $961K | ﹤0.01% |
+33,800
| New | +$839K |
|
2824
PUT
Douglas Emmett
DEI
$2.06B
| $959K | ﹤0.01% |
63,800
-45,500
| -42% | -$658K |
|
2825
Constellation Brands
STZ
$22.2B
| $958K | ﹤0.01% |
+5,891
| New | +$1.06M |
|
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.