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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 | |
|---|---|---|---|---|---|---|---|
1376
CALL
Expedia Group
EXPE
$30.8B
| $3.82M | ﹤0.01% |
14,500
-3,900
| -21% | -$1.14M |
2021 Q1
22 quarters
|
|
1377
CALL
Antero Resources
AR
$11.7B
| $3.81M | ﹤0.01% |
114,100
+12,600
| +12% | +$455K |
2017 Q1
38 quarters
|
|
1378
CALL
Shift4
FOUR
$3.44B
| $3.81M | ﹤0.01% |
105,200
-24,600
| -19% | -$1.13M |
2020 Q3
24 quarters
|
|
1379
PUT
EntrepreneurShares Series Trust ERShares Private-Public Crossover ETF
XOVR
$1.42B
| $3.8M | ﹤0.01% |
177,800
-55,700
| -24% | -$1.13M |
2026 Q1
2 quarters
|
|
1380
CALL
Flutter Entertainment
FLUT
$14.8B
| $3.79M | ﹤0.01% |
50,900
+17,400
| +52% | +$1.73M |
2024 Q2
9 quarters
|
|
1381
CALL
HubSpot
HUBS
$9.9B
| $3.79M | ﹤0.01% |
18,500
-6,400
| -26% | -$1.44M |
2021 Q2
21 quarters
|
|
1382
CALL
Dutch Bros
BROS
$4.83B
| $3.78M | ﹤0.01% |
98,100
+74,800
| +321% | +$4.03M |
2021 Q4
19 quarters
|
|
1383
CALL
DHT Holdings
DHT
$3.48B
| $3.78M | ﹤0.01% |
167,500
+115,100
| +220% | +$2.24M |
2018 Q2
33 quarters
|
|
1384
Target
TGT
$73.9B
| $3.78M | ﹤0.01% |
24,103
-4,806
| -17% | -$723K |
2026 Q2
1 quarter
|
|
1385
CALL
X-Energy Inc
XE
$3.14B
| $3.78M | ﹤0.01% |
266,300
+196,000
| +279% | +$3.37M |
2026 Q2
1 quarter
|
|
1386
CALL
Fabrinet
FN
$13.2B
| $3.78M | ﹤0.01% |
8,900
+5,200
| +141% | +$2.39M |
2021 Q4
19 quarters
|
|
1387
CALL
Whirlpool
WHR
$1.98B
| $3.77M | ﹤0.01% |
123,000
+66,100
| +116% | +$2.51M |
2021 Q1
22 quarters
|
|
1388
PUT
Hormel Foods
HRL
$12.1B
| $3.77M | ﹤0.01% |
188,900
+78,700
| +71% | +$1.83M |
2016 Q1
42 quarters
|
|
1389
CALL
Cytokinetics
CYTK
$8.15B
| $3.76M | ﹤0.01% |
57,100
-42,700
| -43% | -$3.26M |
2021 Q2
21 quarters
|
|
1390
PUT
Ares Capital
ARCC
$14.1B
| $3.76M | ﹤0.01% |
196,600
-107,600
| -35% | -$2.08M |
2018 Q2
33 quarters
|
|
1391
CALL
AMC Entertainment Holdings
AMC
$3.05B
| $3.75M | ﹤0.01% |
1,251,400
-315,200
| -20% | -$784K |
2021 Q2
21 quarters
|
|
1392
Marathon Petroleum
MPC
$110B
| $3.75M | ﹤0.01% |
+9,492
| New | +$3.28M |
2026 Q3
0 quarters
|
|
1393
PUT
Infosys
INFY
$49.8B
| $3.75M | ﹤0.01% |
348,800
-62,800
| -15% | -$724K |
2014 Q4
47 quarters
|
|
1394
PUT
SolarEdge
SEDG
$1.65B
| $3.75M | ﹤0.01% |
117,700
-1,000
| -0.8% | -$39.2K |
2021 Q2
21 quarters
|
|
1395
PUT
YieldMax CRCL Option Income Strategy ETF
CRCO
$24.1M
| $3.75M | ﹤0.01% |
217,600
+24,700
| +13% | +$343K |
2025 Q4
3 quarters
|
|
1396
CALL
Xylem
XYL
$21.8B
| $3.75M | ﹤0.01% |
37,000
+17,000
| +85% | +$1.95M |
2017 Q2
37 quarters
|
|
1397
PUT
FedEx
FDX
$75.6B
| $3.75M | ﹤0.01% |
40,700
-30,600
| -43% | -$9.6M |
2021 Q2
21 quarters
|
|
1398
CALL
Butterfly Network
BFLY
$1.91B
| $3.74M | ﹤0.01% |
417,900
+135,700
| +48% | +$1.1M |
2020 Q4
23 quarters
|
|
1399
PUT
W.W. Grainger
GWW
$69.6B
| $3.74M | ﹤0.01% |
3,000
+1,700
| +131% | +$2.24M |
2026 Q1
2 quarters
|
|
1400
CALL
Shoals Technologies Group
SHLS
$1.48B
| $3.74M | ﹤0.01% |
461,300
-28,400
| -6% | -$239K |
2026 Q1
2 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.