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 | |
|---|---|---|---|---|---|---|
4851
TransUnion
TRU
$16B
| $217K | ﹤0.01% |
2,595
-67
| -3% | -$6.08K |
|
4852
CALL
Universal Corp
UVV
$1.37B
| $217K | ﹤0.01% |
3,900
+1,000
| +34% | +$55.3K |
|
4853
CALL
WD-40
WDFC
$2.98B
| $217K | ﹤0.01% |
1,100
+900
| +450% | +$195K |
|
|
AKRO
4854
DELISTED
Akero Therapeutics
AKRO
| $216K | ﹤0.01% |
+4,565
| New | +$221K |
|
4855
Entravision Communication
EVC
$1.02B
| $216K | ﹤0.01% |
92,785
+15,231
| +20% | +$37.1K |
|
4856
Eve Holding
EVEX
$777M
| $216K | ﹤0.01% |
56,896
+53,241
| +1,457% | +$283K |
|
4857
CALL
First Interstate BancSystem
FIBK
$3.67B
| $216K | ﹤0.01% |
+6,800
| New | +$212K |
|
4858
CALL
Tandem Diabetes Care
TNDM
$1.27B
| $216K | ﹤0.01% |
17,800
+3,700
| +26% | +$50.1K |
|
4859
PUT
Loar Holdings
LOAR
$6.23B
| $216K | ﹤0.01% |
2,700
-1,700
| -39% | -$128K |
|
4860
PUT
Black Hills Corp
BKH
$5.55B
| $215K | ﹤0.01% |
3,500
-1,900
| -35% | -$112K |
|
4861
Delcath Systems
DCTH
$400M
| $215K | ﹤0.01% |
20,029
+13,524
| +208% | +$151K |
|
4862
PUT
Enovis
ENOV
$1.74B
| $215K | ﹤0.01% |
7,100
+6,600
| +1,320% | +$200K |
|
4863
CALL
Inspire Medical Systems
INSP
$1.47B
| $215K | ﹤0.01% |
2,900
-2,800
| -49% | -$283K |
|
4864
PUT
Lantheus
LNTH
$6.51B
| $215K | ﹤0.01% |
4,200
-700
| -14% | -$43.7K |
|
4865
CALL
VanEck Merk Gold Trust
OUNZ
$2.51B
| $215K | ﹤0.01% |
+5,800
| New | +$193K |
|
|
SF
4866
CALL
Stifel
SF
$12.4B
| $215K | ﹤0.01% |
2,850
+1,500
| +111% | +$112K |
|
4867
American Resources Corp
AREC
$183M
| $214K | ﹤0.01% |
79,280
+22,251
| +39% | +$38.1K |
|
4868
PUT
Sana Biotechnology
SANA
$882M
| $214K | ﹤0.01% |
60,400
+33,300
| +123% | +$120K |
|
|
QVCGA
4869
CALL
DELISTED
QVC Group Inc Series A
QVCGA
| $214K | ﹤0.01% |
+15,900
| New | +$104K |
|
4870
Federated Hermes
FHI
$4.56B
| $213K | ﹤0.01% |
4,114
+3,187
| +344% | +$162K |
|
4871
CALL
Repligen
RGEN
$6.91B
| $213K | ﹤0.01% |
1,600
+400
| +33% | +$48.6K |
|
4872
PUT
Zumiez
ZUMZ
$330M
| $213K | ﹤0.01% |
10,900
-2,100
| -16% | -$34.7K |
|
|
4873
PUT
Eve Holding
EVEX
$777M
| $212K | ﹤0.01% |
55,800
+45,900
| +464% | +$244K |
|
4874
PUT
First Watch Restaurant Group
FWRG
$814M
| $212K | ﹤0.01% |
13,600
-23,500
| -63% | -$410K |
|
4875
CALL
Polestar Automotive Holding UK
PSNY
$1.97B
| $212K | ﹤0.01% |
7,537
-5,366
| -42% | -$172K |
|
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.