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 | |
|---|---|---|---|---|---|---|
3776
PUT
Ingersoll Rand
IR
$33.9B
| $390K | ﹤0.01% |
4,700
+2,500
| +114% | +$197K |
|
3777
Array Technologies
ARRY
$785M
| $389K | ﹤0.01% |
+66,031
| New | +$401K |
|
3778
PUT
Federal Agricultural Mortgage Class A
AGM.A
$1.62B
| $388K | ﹤0.01% |
2,000
| – | – |
|
3779
Medpace
MEDP
$15.9B
| $388K | ﹤0.01% |
1,238
+594
| +92% | +$178K |
|
3780
CALL
MidCap Financial Investment
MFIC
$811M
| $388K | ﹤0.01% |
30,800
-13,200
| -30% | -$162K |
|
3781
CALL
Viper Energy
VNOM
$8.21B
| $388K | ﹤0.01% |
10,200
-53,700
| -84% | -$2.17M |
|
3782
CALL
A10 Networks
ATEN
$2.25B
| $387K | ﹤0.01% |
20,000
+16,600
| +488% | +$284K |
|
|
HIVE
3783
CALL
HIVE Digital Technologies
HIVE
$760M
| $387K | ﹤0.01% |
215,300
-226,600
| -51% | -$399K |
|
3784
PUT
Teekay Tankers
TNK
$2.66B
| $387K | ﹤0.01% |
9,300
-14,100
| -60% | -$603K |
|
3785
Altimmune
ALT
$581M
| $386K | ﹤0.01% |
99,967
+79,146
| +380% | +$428K |
|
3786
CALL
Candel Therapeutics
CADL
$709M
| $386K | ﹤0.01% |
76,400
+29,600
| +63% | +$152K |
|
3787
Community Health Systems
CYH
$393M
| $385K | ﹤0.01% |
113,312
+6,741
| +6% | +$21.7K |
|
3788
PUT
Rhythm Pharmaceuticals
RYTM
$7.41B
| $385K | ﹤0.01% |
6,100
+5,000
| +455% | +$306K |
|
3789
PUT
Vanguard ESG US Corporate Bond ETF
VCEB
$1.18B
| $385K | ﹤0.01% |
5,300
+2,500
| +89% | +$156K |
|
|
ZH
3790
PUT
Zhihu
ZH
$281M
| $385K | ﹤0.01% |
96,800
-60,300
| -38% | -$234K |
|
|
KLC
3791
KinderCare Learning Companies
KLC
$625M
| $385K | ﹤0.01% |
38,166
+12,101
| +46% | +$140K |
|
|
AMRN
3792
PUT
Amarin Corp
AMRN
$293M
| $384K | ﹤0.01% |
+23,700
| New | +$267K |
|
|
ORLA
3793
CALL
Orla Mining
ORLA
$3.42B
| $384K | ﹤0.01% |
38,400
-6,100
| -14% | -$63.4K |
|
|
VOYG
3794
PUT
Voyager Technologies
VOYG
$1.52B
| $384K | ﹤0.01% |
+9,800
| New | +$467K |
|
3795
CALL
Adaptive Biotechnologies
ADPT
$3.6B
| $383K | ﹤0.01% |
32,900
+27,400
| +498% | +$249K |
|
|
CLBR
3796
CALL
DELISTED
Colombier Acquisition Corp II
CLBR
| $383K | ﹤0.01% |
+128,600
| New | +$1.68M |
|
3797
CALL
Akebia Therapeutics
AKBA
$341M
| $382K | ﹤0.01% |
105,200
+99,500
| +1,746% | +$273K |
|
3798
PUT
ING
ING
$95.1B
| $382K | ﹤0.01% |
17,500
-41,500
| -70% | -$838K |
|
3799
iShares Select Dividend ETF
DVY
$24.1B
| $381K | ﹤0.01% |
2,870
+1,057
| +58% | +$137K |
|
3800
PUT
Heritage Insurance Holdings
HRTG
$905M
| $381K | ﹤0.01% |
15,300
+11,000
| +256% | +$235K |
|
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.