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 |
Microsoft
MSFT
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
8226
CALL
Sprott Junior Gold Miners ETF
SGDJ
$272M
| $6K | ﹤0.01% |
100
-2,100
| -95% | -$118K |
|
|
SGMO
8227
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $6K | ﹤0.01% |
9,609
-115,724
| -92% | -$62.4K |
|
8228
PUT
Shenandoah Telecom
SHEN
$632M
| $6K | ﹤0.01% |
500
-1,000
| -67% | -$13.7K |
|
|
SLN
8229
PUT
Silence Therapeutics
SLN
$521M
| $6K | ﹤0.01% |
1,300
| – | – |
|
8230
SM Energy
SM
$7.96B
| $6K | ﹤0.01% |
+267
| New | +$7.2K |
|
8231
Xtrackers S&P 500 ESG ETF
SNPE
$2.57B
| $6K | ﹤0.01% |
100
| – | – |
|
8232
1st Source
SRCE
$2.07B
| $6K | ﹤0.01% |
+99
| New | +$6.21K |
|
8233
CALL
Stoneridge
SRI
$209M
| $6K | ﹤0.01% |
900
-1,300
| -59% | -$10.3K |
|
8234
Simpson Manufacturing
SSD
$7.98B
| $6K | ﹤0.01% |
+40
| New | +$7.16K |
|
8235
PUT
E.W. Scripps
SSP
$274M
| $6K | ﹤0.01% |
2,800
-3,300
| -54% | -$10.2K |
|
8236
PUT
Shutterstock
SSTK
$205M
| $6K | ﹤0.01% |
300
+200
| +200% | +$4.08K |
|
8237
Stevanato
STVN
$5.37B
| $6K | ﹤0.01% |
+241
| New | +$5.95K |
|
8238
CALL
SurgePays
SURG
$6.05M
| $6K | ﹤0.01% |
+2,200
| New | +$6.24K |
|
8239
CALL
Savara
SVRA
$1.13B
| $6K | ﹤0.01% |
1,800
-500
| -22% | -$1.48K |
|
8240
CALL
Latham Group
SWIM
$646M
| $6K | ﹤0.01% |
+800
| New | +$5.89K |
|
8241
Timken Company
TKR
$9.82B
| $6K | ﹤0.01% |
80
-1,437
| -95% | -$111K |
|
8242
Taylor Morrison
TMHC
| $6K | ﹤0.01% |
91
-8,674
| -99% | -$571K |
|
8243
CALL
Towne Bank
TOWN
$3.35B
| $6K | ﹤0.01% |
+200
| New | +$7.17K |
|
|
TPH
8244
PUT
DELISTED
Tri Pointe Homes
TPH
| $6K | ﹤0.01% |
200
-400
| -67% | -$13.6K |
|
8245
TechTarget
TTGT
$246M
| $6K | ﹤0.01% |
1,053
+786
| +294% | +$5.21K |
|
|
VBTX
8246
DELISTED
Veritex Holdings
VBTX
| $6K | ﹤0.01% |
+208
| New | +$6.71K |
|
8247
PUT
Veru
VERU
$36.1M
| $6K | ﹤0.01% |
1,800
-21,120
| -92% | -$91.3K |
|
8248
PUT
VOC Energy
VOC
$57.5M
| $6K | ﹤0.01% |
2,100
-3,400
| -62% | -$9.73K |
|
8249
PUT
Varex Imaging
VREX
$460M
| $6K | ﹤0.01% |
500
-47,100
| -99% | -$467K |
|
|
VXRT
8250
DELISTED
Vaxart
VXRT
| $6K | ﹤0.01% |
18,592
+5,700
| +44% | +$2.34K |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.