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 | |
|---|---|---|---|---|---|---|
3926
Stewart Information Services
STC
$2.12B
| $463K | ﹤0.01% |
6,324
+5,754
| +1,009% | +$396K |
|
3927
Las Vegas Sands
LVS
$32B
| $462K | ﹤0.01% |
8,598
+6,844
| +390% | +$360K |
|
3928
The RealReal
REAL
$1.44B
| $462K | ﹤0.01% |
43,485
+18,450
| +74% | +$136K |
|
|
KRMN
3929
PUT
Karman Holdings
KRMN
$6.57B
| $462K | ﹤0.01% |
+6,400
| New | +$351K |
|
3930
AllianceBernstein
AB
$3.49B
| $461K | ﹤0.01% |
12,064
+11,153
| +1,224% | +$446K |
|
3931
PUT
Arqit Quantum
ARQQ
$305M
| $461K | ﹤0.01% |
11,900
-5,000
| -30% | -$173K |
|
3932
Pebblebrook Hotel Trust
PEB
$2.2B
| $461K | ﹤0.01% |
+40,542
| New | +$437K |
|
3933
CALL
Pacer Trendpilot US Large Cap ETF
PTLC
$3.24B
| $460K | ﹤0.01% |
10,500
+10,200
| +3,400% | +$537K |
|
3934
PUT
AnaptysBio
ANAB
$1.54B
| $459K | ﹤0.01% |
15,000
+13,700
| +1,054% | +$314K |
|
3935
Texas Pacific Land
TPL
$26.9B
| $459K | ﹤0.01% |
+1,476
| New | +$465K |
|
3936
PUT
Citizens
CIA
$257M
| $458K | ﹤0.01% |
87,300
-230,200
| -73% | -$1.07M |
|
3937
PUT
Ascendis Pharma A/S
ASND
$16.7B
| $457K | ﹤0.01% |
2,300
+1,600
| +229% | +$298K |
|
|
DCH
3938
PUT
Dauch Corp
DCH
$1.33B
| $457K | ﹤0.01% |
76,100
+74,300
| +4,128% | +$398K |
|
3939
CALL
Blend Labs
BLND
$433M
| $457K | ﹤0.01% |
125,300
+89,100
| +246% | +$320K |
|
3940
CALL
Covenant Logistics
CVLG
$1.09B
| $457K | ﹤0.01% |
21,100
+15,200
| +258% | +$363K |
|
3941
PUT
Elanco Animal Health
ELAN
$12.7B
| $457K | ﹤0.01% |
22,700
-87,900
| -79% | -$1.47M |
|
|
SKE
3942
PUT
Skeena Resources
SKE
$3.28B
| $457K | ﹤0.01% |
24,800
-43,100
| -63% | -$705K |
|
|
PRMB
3943
PUT
Primo Brands
PRMB
$8.54B
| $457K | ﹤0.01% |
20,700
+6,900
| +50% | +$179K |
|
3944
PUT
Center Bancorp
CNOB
$1.66B
| $456K | ﹤0.01% |
+18,400
| New | +$454K |
|
3945
CALL
Camping World
CWH
$399M
| $456K | ﹤0.01% |
28,900
-44,500
| -61% | -$762K |
|
3946
PUT
Delek US
DK
$3.85B
| $455K | ﹤0.01% |
14,100
+7,500
| +114% | +$196K |
|
3947
CALL
Everest Group
EG
$15.8B
| $455K | ﹤0.01% |
1,300
| – | – |
|
3948
CALL
PAR Technology
PAR
$707M
| $455K | ﹤0.01% |
11,500
+9,400
| +448% | +$519K |
|
3949
Reynolds Consumer Products
REYN
$5.44B
| $454K | ﹤0.01% |
18,584
+17,751
| +2,131% | +$402K |
|
3950
CALL
Turning Point Brands
TPB
$1.56B
| $454K | ﹤0.01% |
4,600
+1,900
| +70% | +$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.