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 | |
|---|---|---|---|---|---|---|
6776
PUT
Orthofix Medical
OFIX
$492M
| $36K | ﹤0.01% |
2,500
+300
| +14% | +$3.94K |
|
6777
CALL
Omnicell
OMCL
$1.88B
| $36K | ﹤0.01% |
1,200
-1,300
| -52% | -$40K |
|
6778
PUT
Oppenheimer Holdings
OPY
$1.18B
| $36K | ﹤0.01% |
500
| – | – |
|
6779
CALL
Payoneer
PAYO
$2.41B
| $36K | ﹤0.01% |
6,000
-5,400
| -47% | -$36.2K |
|
|
PCH
6780
CALL
DELISTED
PotlatchDeltic
PCH
| $36K | ﹤0.01% |
900
+400
| +80% | +$16.6K |
|
6781
CALL
Protalix BioTherapeutics
PLX
$183M
| $36K | ﹤0.01% |
16,400
-72,000
| -81% | -$117K |
|
6782
Invesco Semiconductors ETF
PSI
$2.03B
| $36K | ﹤0.01% |
521
-232
| -31% | -$14.7K |
|
6783
CALL
Regency Centers
REG
$14.9B
| $36K | ﹤0.01% |
+500
| New | +$35.7K |
|
6784
Rigel Pharmaceuticals
RIGL
$723M
| $36K | ﹤0.01% |
+1,305
| New | +$39K |
|
6785
CALL
ReNew
RNW
$2.18B
| $36K | ﹤0.01% |
4,700
-103,900
| -96% | -$791K |
|
|
SCPH
6786
DELISTED
scPharmaceuticals
SCPH
| $36K | ﹤0.01% |
6,504
-22,713
| -78% | -$116K |
|
6787
PUT
Sun Life Financial
SLF
$45.6B
| $36K | ﹤0.01% |
600
+300
| +100% | +$18K |
|
6788
SelectQuote
SLQT
$122M
| $36K | ﹤0.01% |
+18,396
| New | +$38.9K |
|
6789
SmartRent
SMRT
$192M
| $36K | ﹤0.01% |
+25,712
| New | +$33K |
|
6790
PUT
Sprout Social
SPT
$530M
| $36K | ﹤0.01% |
2,800
+700
| +33% | +$11.4K |
|
|
NSLR
6791
PUT
Neostellar Capital Corp
NSLR
$258M
| $36K | ﹤0.01% |
4,000
-5,600
| -58% | -$48.5K |
|
6792
PUT
Stevanato
STVN
$5.57B
| $36K | ﹤0.01% |
+1,400
| New | +$34.6K |
|
6793
Savara
SVRA
$1.08B
| $36K | ﹤0.01% |
10,302
-1,531
| -13% | -$4.53K |
|
6794
PUT
Teleflex
TFX
$5.96B
| $36K | ﹤0.01% |
300
-100
| -25% | -$12.1K |
|
6795
CALL
Hanover Insurance
THG
$8.13B
| $36K | ﹤0.01% |
200
+100
| +100% | +$17.1K |
|
6796
T-Rex 2X Inverse Tesla Daily Target ETF
TSLZ
$52.8M
| $36K | ﹤0.01% |
2,574
-9,578
| -79% | -$256K |
|
6797
Vanguard Long-Term Corporate Bond ETF
VCLT
$8.81B
| $36K | ﹤0.01% |
+464
| New | +$35.3K |
|
6798
Willis Towers Watson
WTW
$29.8B
| $36K | ﹤0.01% |
106
-358
| -77% | -$116K |
|
6799
CALL
Xperi
XPER
$364M
| $36K | ﹤0.01% |
5,700
| – | – |
|
6800
PUT
Astrana Health
ASTH
$1.81B
| $36K | ﹤0.01% |
1,300
| – | – |
|
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.