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Simplex Trading Portfolio holdings
AUM
$184B
Turnover
28.44%
1-Year Est. Return
51.71%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
(+7.8%)
Cap. Flow
-$519M
Cap. Flow % of AUM
Cap. Flow %
-0.28%
Top 10 Holdings %
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held
Equity + Options
3
years
Top 10 Avg Time Held
Equity + Options
3.9
years
Top 20 Avg Time Held
Equity + Options
4.3
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.5
years
Top 20 Avg Time Held Equity only
0.4
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$92.6M |
| 2 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$80.6M |
| 3 |
Amazon
AMZN
|
+$26.3M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$25.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$20.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$128M |
| 2 |
NVIDIA
NVDA
|
+$97.8M |
| 3 |
Tesla
TSLA
|
+$53.9M |
| 4 |
Micron Technology
MU
|
+$50M |
| 5 |
United States Oil Fund
USO
|
+$49.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.84% |
| 2 | Technology | 0.45% |
| 3 | Consumer Discretionary | 0.14% |
| 4 | Healthcare | 0.14% |
| 5 | Financials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
676
CALL
Oneok
OKE
$55.6B
| $11.7M | 0.01% |
137,700
-32,800
| -19% | -$3.02M |
2014 Q4
47 quarters
|
|
677
CALL
HCA Healthcare
HCA
$106B
| $11.7M | 0.01% |
27,500
+13,000
| +90% | +$5.33M |
2014 Q4
47 quarters
|
|
678
CALL
Talen Energy Corp
TLN
$16.5B
| $11.7M | 0.01% |
37,500
+14,400
| +62% | +$4.8M |
2024 Q3
8 quarters
|
|
679
PUT
Zoetis
ZTS
$33.5B
| $11.7M | 0.01% |
167,900
+7,400
| +5% | +$553K |
2021 Q2
21 quarters
|
|
680
PUT
Cheniere Energy
LNG
$62.2B
| $11.7M | 0.01% |
43,500
+19,500
| +81% | +$5.24M |
2014 Q4
47 quarters
|
|
681
PUT
UBS Group
UBS
$150B
| $11.7M | 0.01% |
243,100
+83,600
| +52% | +$4.39M |
2018 Q1
34 quarters
|
|
682
PUT
Dick's Sporting Goods
DKS
$14.7B
| $11.7M | 0.01% |
87,000
+46,100
| +113% | +$8.13M |
2014 Q4
47 quarters
|
|
|
683
CALL
Zoetis
ZTS
$33.5B
| $11.7M | 0.01% |
167,300
+6,700
| +4% | +$501K |
2021 Q2
21 quarters
|
|
684
PUT
Lumen Technologies, Inc. Common Stock
LUMN
$4.59B
| $11.7M | 0.01% |
2,083,300
+398,900
| +24% | +$2.54M |
2021 Q2
21 quarters
|
|
685
CALL
Texas Pacific Land
TPL
$19.4B
| $11.7M | 0.01% |
35,800
-2,700
| -7% | -$1.02M |
2026 Q1
2 quarters
|
|
686
CALL
Invesco S&P SmallCap Low Volatility ETF
XSLV
$240M
| $11.7M | 0.01% |
247,100
-72,300
| -23% | -$3.8M |
2026 Q1
2 quarters
|
|
687
PUT
Workday
WDAY
$46.1B
| $11.7M | 0.01% |
61,200
-63,200
| -51% | -$11M |
2021 Q1
22 quarters
|
|
688
PUT
Hut 8
HUT
$7.33B
| $11.6M | 0.01% |
135,100
-83,800
| -38% | -$7.93M |
2021 Q2
21 quarters
|
|
689
CALL
Navitas Semiconductor
NVTS
$2.71B
| $11.6M | 0.01% |
1,001,300
-76,900
| -7% | -$949K |
2021 Q4
19 quarters
|
|
690
CALL
SiriusXM
SIRI
$10.9B
| $11.6M | 0.01% |
448,400
-107,400
| -19% | -$3.13M |
2020 Q1
26 quarters
|
|
691
CALL
AGNC Investment
AGNC
$10.8B
| $11.6M | 0.01% |
1,278,300
+342,500
| +37% | +$3.64M |
2016 Q1
42 quarters
|
|
692
CALL
Kratos Defense & Security Solutions
KTOS
$6.91B
| $11.6M | 0.01% |
271,500
+110,000
| +68% | +$5.61M |
2026 Q1
2 quarters
|
|
693
CALL
Monolithic Power Systems
MPWR
$72.1B
| $11.6M | 0.01% |
8,600
+6,700
| +353% | +$8.78M |
2019 Q1
30 quarters
|
|
694
CALL
Schwab US Broad Market ETF
SCHB
$44.6B
| $11.6M | 0.01% |
351,500
-209,200
| -37% | -$6.14M |
2017 Q4
35 quarters
|
|
695
Boston Scientific
BSX
$65.4B
| $11.6M | 0.01% |
264,645
+256,222
| +3,042% | +$11.9M |
2026 Q2
1 quarter
|
|
696
CALL
SAP
SAP
$270B
| $11.5M | 0.01% |
55,400
-32,500
| -37% | -$6.31M |
2014 Q4
47 quarters
|
|
697
PUT
Microchip Technology
MCHP
$33.8B
| $11.5M | 0.01% |
148,500
-104,500
| -41% | -$8.14M |
2021 Q2
21 quarters
|
|
698
CALL
Nutanix
NTNX
$16.4B
| $11.5M | 0.01% |
163,500
-6,400
| -4% | -$402K |
2016 Q4
39 quarters
|
|
699
CALL
The Mosaic Company
MOS
$7.25B
| $11.5M | 0.01% |
530,900
+142,800
| +37% | +$3.31M |
2021 Q2
21 quarters
|
|
700
PUT
Cleveland-Cliffs
CLF
$7.5B
| $11.5M | 0.01% |
1,043,800
+777,100
| +291% | +$8.82M |
2014 Q4
47 quarters
|
|
Similar funds
Simplex Trading's Q3 2026 Portfolio in Review
As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
- Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
- Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
- Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
- Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
- Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.
Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.