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 | |
|---|---|---|---|---|---|---|
1576
Global X Silver Miners ETF NEW
SIL
$4.08B
| $3.8M | ﹤0.01% |
78,910
+4,628
| +6% | +$198K |
|
1577
Futu Holdings
FUTU
$13.9B
| $3.79M | ﹤0.01% |
30,673
+18,722
| +157% | +$1.91M |
|
|
AKRO
1578
CALL
DELISTED
Akero Therapeutics
AKRO
| $3.78M | ﹤0.01% |
70,900
+5,800
| +9% | +$264K |
|
|
PONY
1579
PUT
Pony AI Inc
PONY
$3.1B
| $3.78M | ﹤0.01% |
+286,500
| New | +$3.46M |
|
1580
TeraWulf
WULF
$9.15B
| $3.78M | ﹤0.01% |
863,094
+560,895
| +186% | +$1.92M |
|
1581
CALL
TransUnion
TRU
$14.8B
| $3.77M | ﹤0.01% |
42,900
+31,800
| +286% | +$2.65M |
|
1582
CALL
Alaska Air
ALK
$5.15B
| $3.77M | ﹤0.01% |
76,200
-110,700
| -59% | -$5.38M |
|
|
AEVA
1583
Aeva Technologies
AEVA
$1.02B
| $3.75M | ﹤0.01% |
99,201
+71,462
| +258% | +$1.09M |
|
1584
CALL
Tradeweb Markets
TW
$21.3B
| $3.75M | ﹤0.01% |
25,600
-3,900
| -13% | -$544K |
|
1585
PUT
Booz Allen Hamilton
BAH
$8.7B
| $3.74M | ﹤0.01% |
35,900
-41,700
| -54% | -$4.67M |
|
|
PPLT
1586
CALL
abrdn Physical Platinum Shares ETF
PPLT
$1.81B
| $3.73M | ﹤0.01% |
304,000
+295,000
| +3,278% | +$2.89M |
|
1587
CALL
Coeur Mining
CDE
$15.6B
| $3.73M | ﹤0.01% |
421,500
+44,300
| +12% | +$323K |
|
1588
PUT
Pegasystems
PEGA
$4.41B
| $3.73M | ﹤0.01% |
69,000
+60,400
| +702% | +$2.74M |
|
1589
CALL
Monolithic Power Systems
MPWR
$65.5B
| $3.73M | ﹤0.01% |
5,100
-5,600
| -52% | -$3.57M |
|
1590
PUT
Omega Healthcare
OHI
$15.4B
| $3.73M | ﹤0.01% |
101,800
+18,500
| +22% | +$687K |
|
|
GAP
1591
The Gap Inc
GAP
$6.84B
| $3.73M | ﹤0.01% |
+171,061
| New | +$3.82M |
|
|
CYBR
1592
DELISTED
CyberArk
CYBR
| $3.73M | ﹤0.01% |
9,159
+6,927
| +310% | +$2.52M |
|
|
PARA
1593
DELISTED
Paramount Global Class B
PARA
| $3.72M | ﹤0.01% |
+288,587
| New | +$3.38M |
|
1594
PUT
FirstEnergy
FE
$28.9B
| $3.72M | ﹤0.01% |
92,400
-125,300
| -58% | -$5.17M |
|
1595
PUT
Planet Fitness
PLNT
$4.23B
| $3.72M | ﹤0.01% |
34,100
-4,400
| -11% | -$441K |
|
1596
PUT
Veeva Systems
VEEV
$30.3B
| $3.71M | ﹤0.01% |
12,900
-300
| -2% | -$74.4K |
|
1597
PUT
AutoZone
AZO
$48.3B
| $3.71M | ﹤0.01% |
1,000
+500
| +100% | +$1.84M |
|
1598
PUT
Varonis Systems
VRNS
$5.25B
| $3.71M | ﹤0.01% |
73,100
+29,700
| +68% | +$1.35M |
|
1599
PUT
Blackstone Mortgage Trust
BXMT
$2.82B
| $3.71M | ﹤0.01% |
192,500
-44,300
| -19% | -$840K |
|
|
CYBR
1600
PUT
DELISTED
CyberArk
CYBR
| $3.7M | ﹤0.01% |
9,100
+7,000
| +333% | +$2.55M |
|
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.