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 | |
|---|---|---|---|---|---|---|
4751
CALL
Regal Rexnord
RRX
$12.5B
| $159K | ﹤0.01% |
1,100
-1,200
| -52% | -$151K |
|
4752
CALL
10x Genomics
TXG
$5.88B
| $159K | ﹤0.01% |
13,800
-8,000
| -37% | -$72.9K |
|
|
SMCY
4753
YieldMax SMCI Option Income Strategy ETF
SMCY
$97.3M
| $159K | ﹤0.01% |
7,507
+5,982
| +392% | +$115K |
|
4754
PUT
Element Solutions
ESI
$8.48B
| $158K | ﹤0.01% |
7,000
-25,700
| -79% | -$539K |
|
4755
CALL
Jack in the Box
JACK
$314M
| $158K | ﹤0.01% |
9,100
-15,000
| -62% | -$337K |
|
4756
CALL
Littelfuse
LFUS
$10.4B
| $158K | ﹤0.01% |
700
+500
| +250% | +$98.6K |
|
4757
CALL
Principal Financial Group
PFG
$24.3B
| $158K | ﹤0.01% |
2,000
-1,200
| -38% | -$92.1K |
|
4758
Star Bulk Carriers
SBLK
$3.05B
| $158K | ﹤0.01% |
9,160
-28,736
| -76% | -$447K |
|
4759
Sportradar
SRAD
$4.42B
| $158K | ﹤0.01% |
5,640
-116,791
| -95% | -$2.77M |
|
4760
Scholar Rock
SRRK
$5.88B
| $158K | ﹤0.01% |
4,472
-2,640
| -37% | -$82.9K |
|
4761
PUT
Theravance Biopharma
TBPH
$873M
| $158K | ﹤0.01% |
14,400
+14,000
| +3,500% | +$136K |
|
4762
Wolfspeed
WOLF
$1.04B
| $158K | ﹤0.01% |
+397,459
| New | +$906K |
|
4763
ADT
ADT
$5.43B
| $157K | ﹤0.01% |
18,632
-20,578
| -52% | -$168K |
|
4764
CALL
Barings BDC
BBDC
$869M
| $157K | ﹤0.01% |
17,200
-3,900
| -18% | -$34.7K |
|
4765
Global X DAX Germany ETF
DAX
$226M
| $157K | ﹤0.01% |
3,496
+3,224
| +1,185% | +$136K |
|
4766
Mid-America Apartment Communities
MAA
$16B
| $157K | ﹤0.01% |
+1,062
| New | +$166K |
|
4767
CALL
Pilgrim's Pride
PPC
$7.13B
| $157K | ﹤0.01% |
3,500
-20,500
| -85% | -$1.01M |
|
4768
CALL
Saic
SAIC
$4.95B
| $157K | ﹤0.01% |
1,400
+500
| +56% | +$57K |
|
4769
PUT
Universal Corp
UVV
$1.37B
| $157K | ﹤0.01% |
2,700
+700
| +35% | +$40.3K |
|
4770
PUT
Cooper Companies
COO
$14.2B
| $156K | ﹤0.01% |
2,200
-7,200
| -77% | -$551K |
|
|
MURA
4771
DELISTED
Mural Oncology
MURA
| $156K | ﹤0.01% |
63,299
+38,347
| +154% | +$90.4K |
|
4772
CALL
Petco
WOOF
$797M
| $156K | ﹤0.01% |
55,200
-41,200
| -43% | -$128K |
|
4773
CALL
Dakota Gold
DC
$617M
| $155K | ﹤0.01% |
42,200
+10,600
| +34% | +$33.1K |
|
4774
iShares MSCI Emerging Markets ex China ETF
EMXC
$22.1B
| $155K | ﹤0.01% |
+2,465
| New | +$143K |
|
4775
CALL
Gogo Inc
GOGO
$525M
| $155K | ﹤0.01% |
10,600
-24,000
| -69% | -$244K |
|
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.